gnss processing how to download reference data - leica

Training materials – GNSS Processing

How to download reference data

Version 1.0

Leica Infinity, How to download reference data 3

Introduction

This is a step-by-step tutorial in which you learn how to download and import static GNSS data from

continuously operating reference stations from service providers like IGN, IGS or SmartNet, as well as

how to manually add a new reference station.

Multi-constellation (GPS, Glonass, Beidou, Galileo) static raw data has been acquired by the GS14

receiver at 1 Hz sampling rate. In order to process the baseline, we need to download the data from

the closest reference station.

The functionality discussed in this guide requires the Basic license option.

The data from the following folders will be used in this tutorial:

· Data\static-cs-s2_1683_0816_141627

Table of Contents

1. Import rover data .......................................................................................................................................................... 4

2. Find the closest reference station ........................................................................................................................... 5

3. Download the data from the selected reference station ............................................................................... 6

4. Edit the control coordinates for the downloaded station ............................................................................. 8

5. Connect to the Leica SmartNet Service .............................................................................................................. 10

6. Add a user defined reference station .................................................................................................................. 11


1. Import rover data

1.1 Start Infinity and create a new project.

Choose Home tab in the ribbon bar and

select Import.

1.2 In the Import dialog navigate to directory

Data, select the file “static-cs-s2” and

select Import to import the data using the

default settings.

1.3 Switch to the GNSS tab of the data

Inspector to view the imported interval.

If the GNSS Intervals view is not

available, you can display it by

selecting the Viewer button at

the top right corner of the

Inspector.


2. Find the closest reference station

2.1 To view a list of the Reference Stations,

select Download from the Processing

tab.

· The GNSS Manager opens in the

Reference Stations tab.

You can also select the rover

interval in the GNSS Inspector and

select Download Reference Data

from the context menu.


2.2 Maximise the GNSS manager to get a

better view of the stations made available

by following providers:

· SOPAC

· UNAVCO

· NGS

· RGP

The list and the map are filtered by the

radius of the circle.

By default, the circle is located

with a radius of 300km around

your project data .

You can click on the border of the

circle and drag it to shrink or

enlarge its radius and find more

or fewer stations.

You can click inside the circle and

shift it to find stations in another

region.

3. Download the data from the selected reference station

3.1

To download data from a reference

station, e.g. ZIM2, find and highlight it in

the list and select Data Download from

the ribbon bar or use the context menu.

You can also type the name of the

reference station in the Search

box.

You can select multiple reference

stations from the list to download

data simultaneously.


3.2 Next to the Property Grid a new tab

dedicated to download settings opens.

· Start and End Date are

automatically available from the

data imported in the project; in

this case no changes are needed.

· Select to download Precise

Ephemeris as well as the

Navigation File.

· Leave the download directory as

suggested.

3.3 To initiate the download, select the Start

button.

The green Progress Bar informs

that data have been downloaded

and imported into the project.

Availability can comfortably be

checked by clicking the hyperlink

on the file name.

comXXXXX.sp3 files contain

precise orbits for all satellites and

all constellations,

brdmXXXX.16p file contains

broadcast ephemeris for all

satellites and all constellations.


3.4 To verify that the downloaded

ephemerides have been added to the list,

switch to the Precise Ephemeris tab of

the GNSS Manager.

3.5

To verify that the data from the reference

station ZIM2 have automatically been

imported in your project, close the GNSS

Manager and switch to the Intervals view

of the GNSS Inspector.

· You can now process the baseline

ZIM2àCP05.

4. Edit the control coordinates for the downloaded station 4.1 The approximate coordinates of the

downloaded station are read from the

RINEX file header and the station is

assigned the control point role.

To edit the control coordinates, first

highlight ZIM2 from the GNSS Intervals

view and in the Property Grid WGS84

Position change the output from WGS84

Geodetic to WGS84 Cartesian.


If you cannot visualize the

coordinates in Cartesian format,

go to FileàInfo &

SettingsàCoordinates & Units.

Make sure that the WGS84

Cartesian option is checked in the

Coordinate Display.

4.2 Input the following known coordinates for

station ZIM2:

X: 4331300.149 m

Y: 567537.075 m

Z: 4633133.500 m

4.3 To save the changes, select Apply in the

Property Grid.


5. Connect to the Leica SmartNet Service 5.1 To download data from the SmartNet

Reference Stations, connect to the Leica

SmartNet Service by selecting

File Services SmartNet.

· Select a Provider · Log in with user name and

password · Select Connect

The connection check is done and the

user is informed about the status.

5.2 When logged in, the SmartNet reference

stations are also available in the GNSS

Manager Reference Stations tab.

SmartNet reference stations are

indicated by a red station icon in

the Map view.

The procedure to download data

from a SmartNet reference

station is the same as for all other

stations and has been described

in Chapter 3.


6. Add a user defined reference station 6.1 To add a user defined reference station,

select Download from the Processing

ribbon bar and then New from the

Reference Stations tab of the GNSS

Manager, that opens.

6.2 Input the Station info as well as the

WGS84 Position. Use the following data

as an example:

Id: AMBE

Name: Ambert ENSG

Provider: IGN

Sampling Rate: 00:00:30

Receiver Name: ASHTECH PF800

Antenna Name: TPSCR.G3

Satellite System :GPS/GLONASS

Latitude: 45 ° 32’ 26’’N

Longitude: 3 ° 45‘ 00’’ E

Ellip.Height: 617.0 m

6.3 To define the URL select the edit button


6.4 In the Edit URL flyout, input the ftp

address:

ftp://rgpdata.ensg.ign.fr/pub/data/%yyyy/

%ddd/data_30/amb2%ddd0.%yyd.Z

with %yyyy being the placeholder for a 4-

digit year, %yy being a placeholder for a

2-digit year and the %ddd being the

placeholder for a day of the year.

The URL Preview will always refer

to the current day of the year, but

it is just for illustration to show

that the path and the filename

have been entered correctly.

6.5 Confirm the address by selecting OK.

You can additionally enter the

user name and the password, if

required, but for this reference

station that is not required.

6.6 To create the new manually entered

reference station, select Create.

The map view in the GNSS

Manager jumps to the user

entered location and the new

station is added to the list of all

available reference stations in the

Inspector view.


Manually entered reference

stations are indicated by black

icon in the map view.

User entered reference stations

can be used as all other stations

for downloading data, by

following the procedure described

in Chapter 3.

Heinrich-Wild-Strasse

CH-9435 Heerbrugg

Switzerland

gnss processing how to download reference data - leica

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