gps

GPScorrect�

Getting Started Guide

Version 1.00

June 2002

Revision A

Trimble Navigation LimitedMapping & GIS Division645 North Mary Avenue Phone: +1-408-481-8940Post Office Box 3642 1-800-545-7762Sunnyvale, CA 94085 Fax: +1-408-481-7744U.S.A. www.trimble.com

Contents 2GPScorrect Getting Started Guide

Contents• Overview

• Introduction

• System requirements• Installation

• Installing GPScorrect on a CE device

• Installing GPScorrect on a PC• Using GPScorrect

• Preparing for data collection

• Data collection

• Processing the data• Troubleshooting

• Index

• Legal information

Overview 3GPScorrect Getting Started Guide

OVERVIEWThis overview provides general information about the GPScorrect™ extension for ArcPad 6.0.The overview is divided into two sections:

• Introduction explains how to use the GPScorrect extension and provides an overview of whatyou can do with it.

• System requirements outlines the specifications required for a computer to run theGPScorrect extension.

4

ect extension provides enhancedpositions logged with a Trimble

pics covered include:

OverviewIntroduction

GPScorrect Getting Started Guide

IntroductionWelcome to the GPScorrect extension to ArcPad. The GPScorrGPS and real-time control and allows you to postprocess GPSGPS receiver.

This section introduces you to the GPScorrect extension. The to

• What is GPScorrect?

• Using the GPScorrect extension

• Online help

5

unicates with a Trimble GPSu to set GPS parameters in thethat you create in ArcPad.

s of differential corrections,iver. Depending on your GPSon, satellite, or WAAS

ou can use the GPS Pathfinderntially correct the GPS data and

More...



What is GPScorrect?GPScorrect is an extension to the ArcPad 6.0 software. It commPathfinder® receiver connected to a field computer, allowing yoreceiver and collect postprocessable GPS positions for features

GPScorrect can be used with a wide variety of real-time sourceincluding an external radio, or a Beacon-on-a-Belt (BoB™) recereceiver, GPScorrect also enables you to use integrated beaccorrections.

Once you have collected GPS position data with GPScorrect, yExpress service or the GPS Pathfinder Office software to differeapply those corrections to the Shapefiles collected in ArcPad.

6

.shp

ArcPad creates Shapefiles

.dxf

.shx

p file

GPS Pathfinder Expressor the ShapeCorrect utilityin GPS Pathfinder Officeadjusts the positions in theShapefiles with correctedpositions from the .cor files



The following diagram outlines the GPScorrect workflow.

GPScorrect creates SSF files

ArcPad with

.ssf

.cor

Updated .sh

Trimble’s GPScorrect

GPS Pathfinder Expressor the ShapeCorrect utility

in GPS Pathfinder Officedifferentially corrects the

SSF files

extension

7

tensionstart ArcPad, and controls

the GPScorrect user interfacetions:

ns to view summary or detailedrces, and the location and healths in these sections to quicklys in the Setup section.

on interacts with the GPSogging settings forsoftware.

of DOP values over the next fewnd the times when satellite

you can take a calibration

n information.

More...



Using the GPScorrect exGPScorrect runs automatically in the background when youcommunication between ArcPad and the GPS receiver.

If you want to view status information or change settings, use(UI). The functions of the GPScorrect UI are divided into sec

• Use the Skyplot, Satellite Info, Receiver, and Real-time sectioinformation about the GPS receiver, configured real-time souof the satellites your receiver is tracking. Use the Setup areachange GPS settings or to access GPS and real-time setting

• Use the Setup section to control how the GPScorrect extensireceiver and any real-time correction sources, and to define lpostprocessing the Shapefiles that you collect in the ArcPad

• Use the Plan section to view an animated skyplot and graphhours, so that you can plan your data collection session arougeometry is at its best.

• Use the UTC Time section to display the current UTC time sophotograph for use with the MediaMapper™ software.

• Use the About section to view copyright, licensing, and versio

8

alwayst isthouttap the

list. Toith the



Whenever the GPScorrect UI is open, one of these sections isactive and visible. The Section list button shows the section thacurrently active. You can move between sections at any time wiclosing open forms or screens. To switch to a different section,Section list button and then select a section from the drop-downclose the UI, tap . GPScorrect continues to communicate wGPS receiver, using the settings you configured in the UI.

9

PScorrect Help.



Online helpYou can access online help on your field computerfor the GPScorrect extension. The GPScorrectHelp is a screen-by-screen reference that tells youwhat each control on the screen does.

Help is context-sensitive. If you access the Helpwhile the GPScorrect extension is running, it opensat the topic that corresponds to the currentGPScorrect screen.

To access context-sensitive help from within theGPScorrect extension when using a PC, H/PC Pro,or H/PC 2000, tap . On a PC, you can alsopress [F1] . To access context-sensitive help whenusing a palm-size PC or Pocket PC, tapand select Help.

If you tap and select Help on an H/PCPro, or on a P/PC when the GPScorrect extensionis not running, the main Help Contents topicappears. Select GPScorrect to open the Contents topic of the G

10

n a PC such as a laptop

east the following:

ion 2.11, 2.12, or 3.0

GPScorrect installation)

cessor

r connection to GPS receiver

g)

More...

OverviewSystem requirements


System requirementsThe GPScorrect extension runs on a variety of CE devices, or ocomputer.

To run the GPScorrect extension on a CE device, you need at l

• Pocket PC or Windows CE device running Windows CE vers

• 16 MB RAM with at least 8 MB free memory (for ArcPad and

• H/PC Pro devices: MIPS, SH3, or ARM processor

• Palm-size PC or Pocket PC devices: MIPS, SH3, or ARM pro

• 130 MHz processor or faster

• Serial cable and RS232 serial port (or appropriate adapter) fo

• A grayscale or color touch screen

• 320 × 240 (or 240 × 320) screen resolution

• Reflective screen (or other screen suitable for outdoor viewin

11

u need at least the following:

r connection to GPS receiver

ng Trimble GPS receivers:

ct Release Notes.

OverviewSystem requirements


To run the GPScorrect extension on a desktop or laptop PC, yo

• Windows NT 4.0, 2000, 95, 98, Me, or XP

• 32 MB RAM

• 3 MB free hard disk space

• 130 MHz processor or faster

• Serial cable and RS232 serial port (or appropriate adapter) fo

• Optional touch screen

You can use the GPScorrect extension to connect to the followi

• GPS Pathfinder Power

• GPS Pathfinder Pro XRS

• GPS Pathfinder Pro XR

• GPS Pathfinder Pro XL

• GPS Pathfinder Pocket

• GeoExplorer® CE series (GeoXM™ or GeoXT™)

For information on connecting a receiver, refer to the GPScorre

GPScorrect Getting Started Guide Installation 12

INSTALLATIONGPScorrect is installed on a CE device using a Microsoft ActiveSync connection. It is installeddirectly on a PC.

This section provides information for installing from the GPScorrect CD. The installationinstructions cover:

• Installing GPScorrect on a CE device

• Installing GPScorrect on a PC

NOTE To perform differential correction, you will also need one of the following:

• a subscription to the GPS Pathfinder Express service (www.gpspathfinderexpress.com)

• GPS Pathfinder Office version 2.90 or later installed on your office computer, with the latestupdate applied (using the Web Updater utility)

http://www.gpspathfinderexpress.com

device13

t on

CE device from the GPScorrect

InstallationInstalling GPScorrect on a CE


Installing GPScorreca CE device

This section provides information for installing GPScorrect on aCD.

• Equipment required for installation

• ActiveSync

• Installing on a CE device

• Changing memory allocation

device14

nstallation

ection established between the

ter and the CE device:

• USB

• network card

p computer, refer to the



Equipment required for iTo install GPScorrect, you need the following:

• a CE device as specified in System requirements

• a desktop computer with:

• Windows NT, 2000, 95, 98, Me, or XP installed

• a CD-ROM drive

• Microsoft ActiveSync installed and an ActiveSync conndesktop computer and the CE device

• one of the following connections between the desktop compu

• serial cable • cradle

• infrared • modem

For more information on connecting your CE device and desktodocumentation for your CE device.

device15

ation between your office

evice

ctiveSync is also available from

onnection between the twoesktop computer, ActiveSyncp between the two computers.

t it is stored on the desktopthe two computers. A guest

ted.

nnect to a TSCe data collector,s.

More...



ActiveSyncMicrosoft ActiveSync is a program that lets you exchange informcomputer and a CE device. It is used whenever you:

• install software on the CE device

• move or copy files to or from the CE device

• synchronize data between your office computer and the CE d

NOTE CE devices are usually supplied with the ActiveSync software. Athe Microsoft website.

Before you can exchange information you need to establish a ccomputers. The first time you connect your CE device to your dprompts you to set up either a partnership or guest relationshi

A partnership is a permanent relationship, and information aboucomputer. A partnership also lets you synchronize data betweenrelationship lasts only as long as the two computers are connec

NOTE Trimble recommends that you use a guest relationship to coand an ActiveSync partnership to connect to other CE device

http://www.microsoft.com/mobile/downloads/activesync.asp

device16

at a baud rate of 19200 bits perfastest transfer rate, change the

vailable. For information onyour CE device.

and connecting your desktop



TIP By default, some CE devices connect to the desktop computersecond (bps), making installation and data transfer slow. For theCE device connection settings to use the maximum baud rate achanging the connection speed, refer to the documentation for

For information on creating partnerships or guest relationships,computer and CE device, refer to the ActiveSync Help.

device17

ed installation instructions, refer

vice that does not have VBScripttall VBScript support when youtallation wizard, select the

More...



Installing on a CE deviceYou must install ArcPad before installing GPScorrect. For detailto the ArcPad documentation.

GPScorrect requires VBScript support. If you are using a CE desupport installed (such as a GIS TSCe field device), you can insinstall ArcPad. In the Select Components step of the ArcPad insVBScript Runtime Library for Windows CE check box.

By default, ArcPad stores maps and data files inRAM. If your CE device has a secondary internalstorage location, such as the GeoExplorer CEhandheld’s Disk or the GIS TSCe’s storage card,Trimble recommends that you store your data inthe secondary location. To change the defaultlocation, run ArcPad, tap the Options button,select the Paths tab, and in the Default Maps &Data Files field enter the path to the secondarystorage location. Alternatively, tap the folder iconbeside this field to browse to the folder you want touse.

device18

free memory on the device.ou are installing to a secondarytorage card, GPScorrect alsohis extra 3 MB of RAM is usedn is successfully completed.

ry is available in the secondaryree before you begin installation.

More...



Before installing GPScorrect, make sure that you have enoughGPScorrect requires at least 3 MB of free memory to install. If yinternal storage location, such as the GIS TSCe field device’s srequires at least 3 MB of free memory in that location. Most of tonly while installing. It becomes available again once installatio

WARNING The installation program cannot determine how much memostorage location. You must ensure that enough memory is f

If memory is insufficient, this message appearsduring installation:

Click Cancel, remove any unwanted programsor data files from your CE device, and/orincrease storage memory. Then start theinstallation again.

device19

sufficient, the installation mayar when you try to run theble in the secondary storageperform a full hard reset of theto the Trimble website. Then

any of the following methods:

mputer, refer to the

n.

More...



If memory space in the secondary internal storage location is inappear to complete successfully, but error messages may appeGPScorrect extension. If this happens, make more space availalocation, then install the software again. If the problem persists,CE device. For information on performing a full hard reset, referreinstall the GPScorrect extension.

To install the GPScorrect extension:

1. Connect the CE device to the office computer. You can use

• serial cable

• cradle

• USB

• infrared

• modem

• network card

For information on connecting your CE device to another codocumentation for your CE device.

2. Make sure that the CE device and computer are switched o

http://www.trimble.com/terrasync_ts.asp?Nav=Collection-4574

device20

, ActiveSync starts and the office

is communicating with a GPSr reinstalling the GPScorrectS receiver and exit ArcPad.

you may need to install or set uprefer to the documentation for

More...



If an ActiveSync partnership for these two computers existscomputer connects to the CE device automatically.

NOTE ActiveSync cannot connect to a CE device thatreceiver on the same port. If you are upgrading oextension, make sure you disconnect from the GP

If there is no partnership, or the computers do not connect,ActiveSync on your office computer. For more information,your CE device.

device21

eSync window appears and

o not connect, check that the:on your CE device. Forumentation for your CE device.

computer when device is

More...



When the two computers are connected, the Microsoft Activdisplays the message Connected:

TIP If ActiveSync is installed, but the two computers dCE device is set up to establish a PC connection1. Open the Communications Properties dialog

information on how to do this, refer to the doc2. Select the PC Connection tab.3. Check that the Allow connection with desktop

attached check box is selected.

device22

nnect at the maximum baud raten speed, see ActiveSync.

More...



TIP Make sure that the CE device is configured to coavailable. For details on increasing the connectio

4. If ArcPad is running on the CE device, close it.

device23

e computer. The main setup

D drive folder.

More...



5. Insert the GPScorrect CD-ROM in the CD drive of your officscreen appears:

6. If this screen does not appear, select setup.exe from your C

device24

More...



7. Select Install GPScorrect. The following screen appears:

device25

allation wizard appears:

More...



8. Select Install to a Windows CE device. The GPScorrect inst

device26

ct extension. You will need to(displayed on the CD case).

ing the default, do one of the following:

n. Use this option when installingondary internal storage location.

correct to a secondary storageram memory on the CE device.



9. Follow the instructions on the screen to install the GPScorreenter your GPScorrect serial number and authorization key

10. When the message Install “GPScorrect” usapplication install directory? appears

• Click Yes to install the software to the default locatioonto a TSCe or any device that does not have a sec

• Click No to install the software to asecondary internal storage location, suchas a TDS Ranger’s Disk. The SelectDestination Media dialog appears. Fromthe Save In list, select Disk, then click OKto proceed with the installation.

Always use this option when installingonto a TDS Ranger or Juniper SystemsAllegro.

Trimble recommends that you install both ArcPad and GPSlocation if it is available. This frees internal storage and prog

device27

tiondivided between storage

d program memory runsis allocated.

ory requirements change.

mory warnings, Trimblethe GPScorrect extension.

.

/ System.increase program memory, or to



Changing memory allocaThe random access memory (RAM) on a Windows CE device ismemory and program memory. Storage memory stores files, anprograms. You can adjust the amount of available memory that

NOTE Pocket PCs automatically adjust memory allocation as mem

TIP To increase the speed of your CE device and to prevent low merecommends that you increase program memory when running

To adjust the memory allocation:

1. On the Windows CE task bar, tap .

2. Do one of the following:

• On a Pocket PC, select Settings / System / Memory

• On a Palm-size PC, select Settings / System.

• On a Handheld PC, select Settings / Control Panel3. Select the Memory tab and then drag the slider to the left to

the right to increase storage memory.

4. Tap OK to close the System Properties dialog.

28

t on a PCPC from the GPScorrect CD.

InstallationInstalling GPScorrect on a PC


Installing GPScorrecThis section provides information for installing GPScorrect on a

• Equipment required for installation

• Installing on a PC

• Installing on a different PC

29

nstallationas a CD-ROM drive or networknto the PC. Otherwise, you needcessary files to the PC, and then

ing the setup program you need:

. If you are installing from a CD,a CD-ROM drive over a network.

e running the setup program you

.

00, 95, 98, Me, or XP installed. IfCD-ROM drive.

hat can be connected to both).

uter, refer to the documentation



Equipment required for iIf the PC that you want to install the GPScorrect extension on haccess to a CD-ROM drive, you can install GPScorrect directly oto run the setup program on a desktop computer, transfer the necomplete the installation on the PC.

To install the GPScorrect extension on the same PC that is runn

• a field computer: a PC as specified in System requirementsthe field computer must have a CD-ROM drive, or access to

To install the GPScorrect extension on a different PC to the onneed:

• a field computer: a PC as specified in System requirements

• an office computer: a desktop computer with Windows NT, 20you are installing from a CD, the office computer must have a

• a removable storage device with a capacity of at least 3 MB tcomputers (for example, a Zip drive or a CompactFlash card

For more information on connecting your PC and desktop compfor your PC.

30

tailed installation instructions,

ccess to a CD drive, follow the

More...



Installing on a PCNOTE You must install ArcPad before installing GPScorrect. For de

refer to the ArcPad documentation.

TIP To install GPScorrect from a CD onto a PC that does not have ainstructions in Installing on a different PC.

31

uter. The main setup screen

More...



To install the GPScorrect extension:

1. Make sure that ArcPad is not running on the computer.

2. Insert the GPScorrect CD-ROM in the CD drive of the compappears:

32

D drive folder.

More...



3. If this screen does not appear, select setup.exe from your C

4. Select Install GPScorrect. The following screen appears:

33

appears:

More...



5. Select Install to this PC. The GPScorrect installation wizard

34

ct extension. You will need to(displayed on the CD case).



6. Follow the instructions on the screen to install the GPScorreenter your GPScorrect serial number and authorization key

35

Cccess to a CD-ROM drive, yousetup files from the GPScorrectC.

access to a CD-ROM drive:

uter.

op computer.

More...



Installing on a different PIf the PC that you want to install GPScorrect on does not have amust use a removable storage device to transfer the necessaryCD to the target PC, and then complete the installation on the P

To install the GPScorrect extension on a PC that does not have

1. Connect the removable storage device to the desktop comp

2. Insert the GPScorrect CD-ROM in the CD drive of the deskt

36

3. Using Windows Explorer, locatethe Install\PC folder on the CDand copy the PC folder to thestorage device.

4. Disconnect the storage devicefrom the desktop computer andconnect it to the field computer.

5. Use Windows Explorer to copythe PC folder from the storagedevice to the field computer.

6. On the field computer, locate thePC folder and run setup.exe.

7. Follow the instructions on thescreen to install the GPScorrectextension. You will need to enteryour GPScorrect serial numberand authorization key (displayed on the CD case).

Using GPScorrect 37GPScorrect Getting Started Guide

USING GPScorrectThis section outlines the workflow for configuring your equipment and software, collecting datausing the GPScorrect extension, and processing the collected data. It provides step-by-stepinstructions for key tasks. For detailed information on other tasks, refer to the documentation forthe product used to perform the task.

• Preparing for data collection

Before you collect any data, configure ArcPad to use the GPScorrect protocol. Then useGPScorrect to configure GPS settings, select real-time correction sources if required, and enableGPS logging to SSF.

• Data collection

Once you are in the field, use GPScorrect to check GPS and real-time status. Use the Plansection in GPScorrect to plan your data collection session around the times of best satellitegeometry, and adjust your GPS settings if necessary. Then use ArcPad to collect data as usual.

• Processing the data

Back in the office, transfer the Shapefiles and their matching SSF files to your office computer.Then use either GPS Pathfinder Express or GPS Pathfinder Office to differentially correct theSSF files and merge the GPS data from each SSF file into the corresponding Shapefile.

38

llectionorrect protocol. Then usen sources if required, and enable

Using GPScorrectPreparing for data collection


Preparing for data coBefore you collect any data, configure ArcPad to use the GPScGPScorrect to configure GPS settings, select real-time correctioGPS logging to SSF.

• ArcPad settings

• GPScorrect settings

39

ect communications protocol and

rcPad.

bove are essential. However,operates, or are overridden by

GPScorrect Help.



ArcPad settingsTo connect to a Trimble GPS receiver, you must specify the corrsettings in ArcPad:

1. On the taskbar, tap and then select Programs / A

2. Tap the Tools button . The Options dialogappears:

3. Make sure the Protocol tab is selected.

4. From the Protocol field, select TrimbleGPScorrect.

5. If you want GPScorrect to connect to the GPSreceiver whenever ArcPad starts, select theAutomatically Activate check box.

6. Select the GPS tab.

7. In the Port field, select the port that your GPSreceiver is connected to, then tap OK.

NOTE To use GPScorrect with ArcPad, only the settings detailed aother settings in this dialog either affect the way GPScorrectsettings in GPScorrect. For detailed information, refer to the

40

real-time correction sources, and



GPScorrect settingsGPScorrect lets you configure GPS quality control settings, anythe type of GPS data you want to collect.

• Configuring GPS and real-time settings

• Enabling SSF logging

41

e settingsPS and real-time settings:

the Tools button and

creen to adjust GPS settings.r of less precise positions, or toly, to specify custom settings, tap

the GPS Settings button.

button to open the Real-timen sources that you want to use,

g real-time corrections, select1 field.

ect, refer to the GPScorrect Help.



Configuring GPS and real-timUse the Setup areas in the GPScorrect extension to configure G

1. In ArcPad, tap the GPScorrect tool , or tap the arrow onselect GPScorrect. GPScorrect’s Skyplot section appears.

2. Use the GPS slider in the Setup area at the bottom of the sMove the slider control to the left to collect a greater numbethe right to collect fewer, more precise positions. Alternativethe Setup button , or move to the Setup section and tap

3. Move to the Setup section and tap the Real-time SettingsSettings form, where you can specify the real-time correctioand configure settings for each source if necessary.

TIP To log autonomous GPS positions without applyinthe Use uncorrected GPS option from the Choice

For more information on GPS and real-time settings in GPScorr

42

Enabling SSF loggingUse the Logging Settings form to enable logging ofGPS data to an SSF file:

1. Tap the Section list button and select Setup.

2. Tap the Logging Settings button.

3. From the Log GPS to SSF field, select On.

4. From the Data Type field, select a record type:

• To log normal GPS position records, selectStandard.

• To log SuperCorrect records as well asGPS position records, select SuperCorrect.

TIP If you log SuperCorrect records, you can get betterprecision with postprocessing. You can alsopostprocess all data, including real-time correcteddata and data collected using different satellitesfrom those visible at the base station.

5. Tap Apply.

43

al-time status. Use the Pland the times of best satelliteArcPad to collect data as usual.

Using GPScorrectData collection


Data collectionOnce you are in the field, use GPScorrect to check GPS and resection in GPScorrect to plan your data collection session aroungeometry, and adjust your GPS settings if necessary. Then use

• Checking the GPS status

• Planning the data collection session

• Collecting data

44

More...



Checking the GPS statusWhen you activate GPS in ArcPad, GPScorrectconnects to the GPS receiver, and begins to trackvisible satellites and to calculate its currentposition.

You can configure ArcPad to activate GPSautomatically whenever it runs. For moreinformation, see ArcPad settings. To activateGPS manually, tap the arrow on the GPS Position/Status button and select GPS Active.

Move to a location where you have a clear view ofthe sky, then use the satellite icon on the status barto check whether the receiver is computing GPSpositions. The number beside the satellite iconindicates how many satellites are being used tocompute GPS positions. If the satellite geometry istoo poor to compute positions, the icon flashes.

45

e the skyplot to check thed to see your current position.

to check that you are receiving

er to the GPScorrect Help.



The Skyplot section appears when you first run GPScorrect. Ussatellites that are being tracked and the GPS solution quality, an

If you are using real-time corrections, use the Real-time sectioncorrections from the selected source.

For detailed information on the Skyplot or Real-time section, ref

46

ion session

changes.

rrect Help.



Planning the data collectThe Plan section in GPScorrect includes ananimated skyplot of projected satellite positionsover the next twelve hours, and a graph showingDOP values over that period, using the currentGPS settings.

Once you have reached the location where you willbe collecting data, open the Plan section andcheck the DOP graph at the bottom of the screen.High DOP values appear in green, and values thatexceed the currently configured maximum value(the horizontal line) appear in red.

Use the Play button or the slider on the timeline to“play” the session or to check GPS conditions at aparticular time.

If necessary, move to the Skyplot or Satellite Infosection and use the Setup area to adjust the GPSsettings. Then return to the Plan section to see the effect of the

For detailed information on the Plan section, refer to the GPSco

47

Collecting dataData collection with the GPScorrect extension isexactly like data collection with ArcPad alone.Once you have enabled GPS logging inGPScorrect, you do not have to do anything extrato ensure that GPS data is logged to SSF files.Simply create or edit layers and features in ArcPadas usual.

In ArcPad, each feature type is stored in aShapefile. When you create a layer or add featuresto an existing layer, GPScorrect automaticallycreates an SSF file with the same filename andstores all GPS position information for that featuretype in the corresponding SSF file.

NOTE You cannot log new GPS positions to an SSF filethat is more than a week old. To maintain accuratestorage, it is necessary to limit the time-span of adata file to seven days.

48

finder Office or GPS Pathfinder

Using GPScorrectProcessing the data


Processing the dataAfter your data collection session, you can use either GPS PathExpress to process the data collected.

• Transferring the data

• Processing the data with GPS Pathfinder Express

• Processing the data with GPS Pathfinder Office

49

copy and paste the data files thatlder on the desktop computer. Infiles as well.

u create in ArcPad. For example,s you need to transfer are:

the .shx or .dbf files.



Transferring the dataTo transfer your data to a desktop computer, use ActiveSync toyou collected from the ArcPad folder on the field computer to a foaddition to the usual Shapefile files, remember to copy the SSF

GPScorrect records a separate SSF file for each feature type yoif you collect two feature types called Roads and Lakes, the file

NOTE GPS Pathfinder Express and GPS Pathfinder Office do not use

• Lakes.shp • Roads.shp

• Lakes.shx • Roads.shx

• Lakes.dbf • Roads.dbf

• Lakes.ssf • Roads.ssf

50

der Express. GPS PathfinderSF file from GPScorrect and thend.

to register for the service. Whenount.



Processing the data withGPS Pathfinder ExpressThis section shows you how to process data using GPS PathfinExpress is a Web-based service that differentially corrects the Sadjusts the positions in the corresponding Shapefile from ArcPa

To process your data using GPS Pathfinder Express, you needyou register, a free trial subscription is credited to your new acc

The topics in this section are:

• Setting processing options

• Submitting files for processing

51

your processing settings.

inderexpress.com).

user ID and password, and click

click Register, fill in the fieldsick Submit.ttings page appears.

More...



Setting processing optionsBefore you submit your files for processing, you need to check

To set GPS Pathfinder Express processing options:

1. Go to the GPS Pathfinder Express website (www.gpspathf

2. Sign in to the GPS Pathfinder Express service:

• If you have already registered, click Sign In, enter yourSign In again.

• If you have not registered for GPS Pathfinder Express,(fields marked with an asterisk * are mandatory), and cl

3. Click the Settings link on the left side of the screen. The Se

4. Select the GPScorrect for ArcPad option and click Next.

http://www.gpspathfinderexpress.com

52

t.



5. In the Base file provider group, select adifferential correction option. Do one ofthe following:

• Select your base station provider fromthe list of available base stations.

• Select Automatic to let GPSPathfinder Express select the closestprovider for you.

6. From the Output GPS Positions group,select an output option:

• Select Corrected Only to outputpositions that have been corrected byGPS Pathfinder Express, positionsthat were corrected in real time, andnon-GPS positions.

• Select Corrected and Uncorrected tooutput all positions, includingpositions that GPS Pathfinder Express could not correc

7. Click Save.

53

g

iles link on the left side of the

for a Zip file containing pairs oflayers called Roads and Lakes,

bmit Files page. The path andhapefile (.SHP) field.

the second Browse button and

More...



Submitting files for processinTo submit files for processing:

1. On the GPS Pathfinder Express website, click the Submit Fscreen. The Submit Files page appears.

2. Click the first Browse button and browse for a Shapefile, orShapefiles and SSF files. For example, if you collected twoyou can submit a Zip file containing the following files:

3. When you have found the file, click Open to return to the Sufilename appear in the Select a Zip file OR select a single S

4. If you selected a single Shapefile in the previous step, clickbrowse for the corresponding SSF file.

• Lakes.shp • Roads.shp

• Lakes.ssf • Roads.ssf

54

5. Click Open to return to the Submit Filespage. The path and filename appear inthe Select the matching SSF file field.

6. In the Enter an optional comment field,enter some text to identify the files youhave submitted.

7. Click Submit.

GPS Pathfinder Express differentiallycorrects the GPS data in the SSF file,adjusts the positions in the Shapefileaccordingly, then e-mails the Shapefile tothe address specified in your account.

NOTE GPS Pathfinder Express moves the positionsin the Shapefile. If you have used ArcGIS orArcView 3.x to create spatial index (.sbx and.sbn) files for the Shapefile, these files are nolonger valid after merging the SSF data.Delete the spatial index files, or update themto reference the new positions.

55

finder Office. The topics are:



Processing the data withGPS Pathfinder OfficeThis section shows you how to process the data with GPS Path

• Differentially correcting the SSF files

• Applying corrections to the Shapefiles

56

SF files

.

l Correction utility.

Selected Files field shows all theiles from a different location, or

More...



Differentially correcting the STo differentially correct the SSF files:

1. Start GPS Pathfinder Office.

2. Select the project that you have set up for your ArcPad data

3. Select Utilities / Differential Correction to start the Differentia

If you transferred your files to the current project folder, theSSF files in the project folder. If necessary, you can select fselect only some of the files in the folder for processing.

57

More...



4. If necessary, clickBrowse and locatethe SSF files thatyou transferredfrom the fieldcomputer.Highlight the filesthat you want tocorrect, then clickOpen.

58

urce of base files, three optionsr base files, or Browse. Byfolder on your local drive. If you

e files option, click Browse. The

More...



5. Specify the location of your base files. Depending on the soare available: Local Search for base files, Internet Search fodefault, base files are stored in the current project’s base fileneed to change the Folder path for the Local Search for basConfirm Selected Base Files dialog appears:

59

e selected base files provideon dialog appears:

More...



6. Use the Confirm Selected Base Files dialog to make sure thcoverage for the rover files. Click OK. The Reference Positi

7. Click OK to confirm the reference position.

60

current project folder.

lected.

g.

ults of the differential correction.

the GPS Pathfinder Office Help.



8. Specify the output folder. By default, the output folder is the

9. Select a processing option:

By default, Smart Code and Carrier Phase Processing is se

NOTE GPScorrect does not support carrier phase loggin

10. Click OK to differentially correct the selected files.

11. The Differential Correction Completed dialog details the resClick Close to close this dialog.

For more information about differentially correcting data, refer to

61

hapefilesy corrected SSF files:

finder Office / ShapeCorrect.

rom your field computer.

pen.

More...



Applying corrections to the STo improve the positions in the Shapefiles using the differentiall

1. From the Windows Start menu, select Programs / GPS Path

2. Click Browse and locate the folder where you put the files f

3. Select the Shapefiles that you want to process, then click O

62

ted.

want to use must be in the sameautomatically selects the

More...



The Selected Files field shows the Shapefiles that you selec

NOTE The corrected SSF files (.cor or .ssf files) that youfolder as the Shapefiles. The ShapeCorrect utilitycorrected SSF file that matches each Shapefile.

63

ion:

n corrected by the Differentiale, and non-GPS positions.

, including positions that the

to improve the positions in the

If you have used ArcGIS orapefile, these files are no longeror update them to reference the



4. From the Output GPS Positions group, select an output opt

• Select Corrected Only to output positions that have beeCorrection utility, positions that were corrected in real tim

• Select Corrected and Uncorrected to output all positionsDifferential Correction utility could not correct.

5. Click OK.

The GPS position data from the matching SSF files is usedShapefiles that you selected.

NOTE The ShapeCorrect utility moves the positions in the Shapefiles.ArcView 3.x to create spatial index (.sbx and .sbn) files for a Shvalid after merging the SSF data. Delete the spatial index files,new positions.

64

them. They are grouped into the

TroubleshootingGPScorrect Getting Started Guide

TROUBLESHOOTINGThis section lists potential problems and describes how to solvefollowing categories:

• GPS

• Real-time differential correction

• Position accuracy

65

ing problems with GPS or your

utes of GPScorrect starting

minute of GPScorrect starting


GPSThis section lists possible causes of, and solutions for, the followGPS receiver:

• The message No GPS detected appears

• The receiver has not acquired a satellite within three min

• The receiver cannot compute a GPS position within one

66

t specified in the GPS Settingst the GPS receiver is

correctly connected and isn external power source.

onnected correctly. If itd all other equipment appearsay require servicing.

t is undamaged. If it appearscomputer may require


The message No GPS detected appears

Possible cause SolutionGPScorrect is configured toconnect to the wrong COM port.

Check that the COM porform is the COM port thaconnected to.

The GPS receiver’s battery isdead, or is connectedincorrectly.

Check that the battery ischarged, or connect to a

The cable connecting the fieldcomputer to the GPS receiver isnot connected, is connectedincorrectly, or is faulty.

Check that the cable is cappears to be correct anto be correct, the cable m

The COM port on the fieldcomputer is faulty.

Check that the COM porto be damaged, the fieldservicing.

67

ree minutes of

tion to check how manyer is tracking.a building, a tree, or a largeruction and move away from it.ors.ntenna is connected correctly.to acquire signals from ana and/or antenna cable may

until a new almanac hasent restarts should then be


The receiver has not acquired a satellite within thGPScorrect starting

Possible cause SolutionThe receiver is still looking forsatellites.

Use the Satellite Info secsatellites the GPS receiv

The satellites are beingobstructed.

The obstruction may bevehicle. Identify the obstGPS does not work indo

Your GPS receiver’s externalantenna (or antenna cable) isnot connected, is connectedincorrectly, or is faulty.

Check that the external aIf your receiver still failssatellite, then your antenrequire servicing.

The receiver has not been usedfor a very long time, and thealmanac stored in the receiver isoutdated.

Wait for up to 15 minutesbeen recorded. Subsequrapid.

The receiver has been set toBase mode by anotherapplication.

Reset the GPS receiver.

68

in one minute of

check that sufficient satellites

, check that the minimumhigh. If necessary, move the

crease productivity., check that the minimum

h. If necessary, move thecrease productivity.check for times when thebelow your configured

, check that the configuredP value is not too low. Ifer bar to the left to increaseSlider check box and enter a

x PDOP or Max HDOP field.


The receiver cannot compute a GPS position withGPScorrect starting

Possible cause SolutionToo few satellites are available.Four satellites (SVs) arerequired to compute a position.

Use mission planning toare visible.In the GPS Settings formelevation value is not tooslider bar to the left to inIn the GPS Settings formSNR value is not too higslider bar to the left to in

The current DOP value is toohigh.

Use mission planning toPDOP or HDOP value ismaximum value.In the GPS Settings formmaximum PDOP or HDOnecessary, move the slidproductivity, or clear thelarger number in the Ma

69

rectioning problems with real-time

ction source

iver only) does not appear to

eceiver only) does not appear

r to work


Real-time differential corThis section lists possible causes of, and solutions for, the followcorrections or correction sources:

• Not all positions are corrected in real time

• GPScorrect is not using your first choice real-time corre

• Your integrated beacon component (Pro XR or XRS recework

• Your integrated satellite component (Pro XRS or Power rto work

• Your real-time differential correction link does not appea

70

e correction source

form, change the selection inUse uncorrected GPS to Waitait for real-time choice is

e sources are unavailable,PS logging until real-timeagain.

ry screen, check the status ofsource. Change the

-time Settings form ifhis source is available again.

form, select your preferredce from the Choice 1 field.


Not all positions are corrected in real time

GPScorrect is not using your first choice real-tim

Possible cause SolutionGPScorrect is configured to loguncorrected GPS positions ifreal-time corrections are notavailable.

In the Real-time Settingsthe last Choice field fromfor real-time. When the Wselected, and all real-timGPScorrect suspends Gcorrections are available

Possible cause SolutionYour first choice correctionsource is not available, so yoursecond or third choice is beingused.

In the Real-time Summayour preferred correctionconfiguration in the Realnecessary, or wait until t

The correction source youexpected is not set up as yourpreferred source.

In the Real-time Settingsreal-time correction sour

71

S receiver only) does not

ower receiver only) does

form, set one of the Choiceon. If integrated beacon issource, set the Choice 1 field

Settings form selectthe Mode and Frequency

form, set one of the Choicelite. If integrated satellite issource, set the Choice 1 field

More...


Your integrated beacon component (Pro XR or XRappear to work

Your integrated satellite component (Pro XRS or Pnot appear to work

Possible cause SolutionYou set the real-time sourceincorrectly.

In the Real-time Settingsfields to Integrated Beacyour preferred correctionto Integrated Beacon.

You set the mode or frequencyincorrectly.

In the Integrated Beaconappropriate options fromfields.

Possible cause SolutionYou set the real-time sourceincorrectly.

In the Real-time Settingsfields to Integrated Satelyour preferred correctionto Integrated Satellite.

72

o enable your integratedr to the GPS Pathfinderal.e Settings form, selectthe Service Provider, Name,

e Status screen, check thelite differential subscription.o renew or acquire aGPS Pathfinder Systems


You have not enabled theintegrated satellite componentof your receiver.

For information on how tsatellite component, refeSystems Receiver Manu

You entered the incorrectprovider, satellite, and/orfrequency.

In the Integrated Satellitappropriate options fromand Frequency fields.

Your satellite differentialsubscription has expired or isnot yet activated.

In the Integrated Satellitexpiry date of your satelFor information on how tsubscription, refer to theReceiver Manual.

Possible cause Solution

73

t appear to work

as specified by the supplier.cessary.

ettings form, check that therectly.ettings form, check that theetry link and the transmitted


Your real-time differential correction link does no

Possible cause SolutionYour telemetry link is incorrectlyinstalled, powered, cabled, orconfigured.

Install the telemetry linkConsult the supplier if ne

You set the station IDincorrectly.

In the External Source SStation ID field is set cor

You configured the real-timesettings incorrectly.

In the External Source Ssettings match the telemRTCM data stream.

74

ing problems with positional

s you expect

er in real time or in


Position accuracyThis section lists possible causes of, and solutions for, the followaccuracy:

• The accuracy of recorded GPS positions is not as good a

• You cannot differentially correct your GPS positions (eithpostprocessing)

75

good as you expect

u collect enough positions touracy before closing each

, move the GPS slider bar toder check box and enter aPDOP or Max HDOP field, to

correct extension logs more

, move the GPS slider bar toder check box and enter aNR and/or Min Elevation field,satellites with a strong signal.

More...


The accuracy of recorded GPS positions is not as

Possible cause SolutionYou did not record sufficientpositions to achieve the requiredaccuracy.

In ArcPad, make sure yoachieve the required accfeature.

Your maximum DOP value wastoo high. If you record positionswhen the Dilution of Precision ishigh, this has a detrimentaleffect on the accuracy of thesepositions.

In the GPS Settings formthe right, or clear the Slismaller value in the Maxmake sure that the GPSaccurate positions.

Your minimum SNR or elevationvalue was too low. If you let thereceiver use satellites with a lowSNR or elevation, this maydecrease the accuracy ofpositions calculated by thereceiver.

In the GPS Settings formthe right, or clear the Slilarger value in the Min Sso that the receiver uses

76

tter GPS coverage and use

the GPS Settings form, setAuto to apply velocity filteringecorded. If you selectedata Type field in the Loggingns are filtered. If at least one

source is selected in theand the last Choice field is setn only real-time positions are

the Real-time Settings form,to use differentially corrected


You are operating in an area ofhigh multipath interference.

Move to an area with beoffsets.Apply velocity filtering. Inthe Velocity Filter field toto positions as they are rSuperCorrect from the DSettings form, all positiovalid real-time correctionReal-time Settings form,to Wait for Real-time, thefiltered.

No configured real-time sourceis available, so the GPScorrectextension is using uncorrectedpositions.

In the last Choice field inselect Wait for real-timepositions only.

Possible cause Solution

77

ns (either in real time or

elect SuperCorrect from therrect’s Logging Settings form.ords allows you to postprocesslites at the rover and base were

elevation value in GPScorrectoftware only uses satellitese GPS base station.using another base station file.s collected a new almanac

elect SuperCorrect from therrect’s Logging Settings form.ords allows you to postprocesslites at the rover and base were


You cannot differentially correct your GPS positioin postprocessing)

Possible cause SolutionGPScorrect used satellites thatwere not visible to the GPS basestation.

Before collecting data, sData Type field in GPScoLogging SuperCorrect recyour data even if the satelnot an exact match.Make sure the minimumis high enough that the sthat are also visible to thTry correcting your data

You reset the GPS PathfinderPocket receiver and beganlogging data before a newalmanac was collected, causingGPScorrect to use satellites thatwere not visible to the basestation.

Wait until the receiver habefore you log data.Before collecting data, sData Type field in GPScoLogging SuperCorrect recyour data even if the satelnot an exact match.

78

# A B C D R S T U V W X Y Z

GPScorrect Getting S

SymboNumer.dbf files.sbn files.sbx files.shp files.shx files.ssf files

eedtion

iondata

ex files created in

Index

More...

Index

E F G H I J K L M N O P Q

tarted Guide

ls andics

AActiveSync

connection spguest connecinstallingoverviewpartnershiprequired verssynchronizing

ArcGIS, spatial ind

# A R S T U V W X Y Z

79GPS

Arc

Arc

BbasbauBea

desktop computer

us

ng in ArcPad

evice and office computernd office computer

More...

B C D E F G H I J K L M N O P Q

Indexcorrect Getting Started Guide

Padcollecting featuresinstalling on a CE deviceinstalling on a PCsettingsspecifying COM portusing GPScorrect with

View, spatial index files created in

e files, selectingd rate, for communicating with ActiveSynccon-on-a-Belt receiver, troubleshooting

CCE device

connecting torequirements

checkingGPS statusreal-time stat

collecting dataCOM port, specifyiconfiguration

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connectionbetween CE dbetween PC a

connection speedcopyright


80GPS

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ecting datain GPS Pathfinder Expressin GPS Pathfinder Office

ection sourcestom GPS settings

collecting featurespostprocessing with GPS Pathfinder Expresspostprocessing with GPS Pathfinder Officecollectionplanning sessionpreparing for

differential correctiin GPS Pathfin GPS Pathfrequirementsselecting bas

Differential Correct

Eenabling SuperCorequipment

required for inrequired for inrequired for in

external correction


81GPS

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ures, collecting, submitting to GPS Pathfinder Express forocessing

S Pathfinder Expresspostprocessing data withsettingssubmitting filessubscriptionusing with GPScorrect

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82GPS

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roving positions in Shapefileswith GPS Pathfinder Expresswith GPS Pathfinder Office

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integrated beacon,integrated satelliteintegrated WAAS,introduction to the

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83GPS

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rosoft ActiveSyncsion planning

overview

e computerconnecting to CE deviceconnecting to PC to install GPScorrecttransferring data to

ne Help

Ppartnership, settingPC

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accuracy ofimproving in S

postprocessingwith GPS Patwith GPS Pat

predicted satellite lpreparing for data


84GPS

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blemswith GPSwith position accuracywith real-time corrections

ject in GPS Pathfinder Officetocol, specifying in ArcPad

io, troubleshootingl-time correction sources

troubleshootingl-time sectionchecking real-time status

l-time statusiver, troubleshooting

ase notice

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in ArcPadin GPS Pathf

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85GPS

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SSF

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PS Pathfinder Express



peCorrect utilitypefilesimproving positions in GPS Pathfinder Officesubmitting to GPS Pathfinder Expresstransferring to office computer

plot sectionchecking GPS status

cificationsof CE deviceof PCfileslogging GPS data automaticallysubmitting to GPS Pathfinder Expresstransferring to office computer

mitting files to GPS Pathfinder ExpressscriptionerCorrect logging, enablingported GPS receiverschronization

Ttrademarkstransferring data totroubleshooting

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Legal information 86GPScorrect Getting Started Guide

Legal informationCopyright© 2002 Trimble Navigation Limited. All rights reserved.For STL support, the GPScorrect extension uses the Moscow Center for SPARC Technology adaptation of the SGIStandard Template Library. Copyright © 1994 Hewlett-Packard Company, Copyright © 1996, 97 Silicon GraphicsComputer Systems, Inc., Copyright © 1997 Moscow Center for SPARC Technology.

Release NoticeThis is the June 2002 release (Revision A) of the GPScorrect Getting Started Guide. It applies to version 1.00 of theGPScorrect extension to ArcPad.

TrademarksThe Globe & Triangle logo, Trimble, GPScorrect, BoB, GeoXM, and GeoXT are trademarks of Trimble NavigationLimited. The Sextant logo with Trimble, GeoExplorer, and GPS Pathfinder, are trademarks of Trimble NavigationLimited, registered in the United States Patent and Trademark Office.MediaMapper is a trademark of Red Hen Systems, Inc. and is used under license.ArcCatalog, ArcMap, ArcPad, and the ArcPad logo are trademarks, registered trademarks, or service marks ofESRI in the United States, the European Community, or certain other jurisdictions.All other trademarks are the property of their respective owners.

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