arcscan for arcgis tutorial - .1 in this tutorial arcscan for arcgis tutorial •...

Download ArcScan for ArcGIS Tutorial - .1 IN THIS TUTORIAL ArcScan for ArcGIS Tutorial • Exercise 1: Raster

Post on 04-Jun-2018

219 views

Category:

Documents

0 download

Embed Size (px)

TRANSCRIPT

  • ArcGIS

    9ArcScan for ArcGIS Tutorial

  • Copyright 20022008 ESRIAll rights reserved.Printed in the United States of America.

    The information contained in this document is the exclusive property of ESRI. This work is protected under United States copyright law and otherinternational copyright treaties and conventions. No part of this work may be reproduced or transmitted in any form or by any means, electronic ormechanical, including photocopying and recording, or by any information storage or retrieval system, except as expressly permitted in writing by ESRI. Allrequests should be sent to Attention: Contracts and Legal Services Manager, ESRI, 380 New York Street, Redlands, CA 92373-8100 USA.

    The information contained in this document is subject to change without notice.

    WRITER

    Phil Sanchez

    U.S. GOVERNMENT RESTRICTED/LIMITED RIGHTS

    Any software, documentation, and/or data delivered hereunder is subject to the terms of the License Agreement. In no event shall the U.S. Government acquiregreater than RESTRICTED/LIMITED RIGHTS. At a minimum, use, duplication, or disclosure by the U.S. Government is subject to restrictions as set forth inFAR 52.227-14 Alternates I, II, and III (JUN 1987); FAR 52.227-19 (JUN 1987) and/or FAR 12.211/12.212 (Commercial Technical Data/ComputerSoftware); and DFARS 252.227-7015 (NOV 1995) (Technical Data) and/or DFARS 227.7202 (Computer Software), as applicable. Contractor/Manufactureris ESRI, 380 New York Street, Redlands, CA 92373-8100 USA.

    ESRI, ArcScan, ArcScan for ArcGIS, ArcMap, and ArcGIS are trademarks, registered trademarks, or service marks of ESRI in the United States, the EuropeanCommunity, or certain other jurisdictions.

    Other companies and products mentioned herein may be trademarks or registered trademarks of their respective trademark owners.

  • 1

    IN THIS TUTORIAL

    ArcScan for ArcGIS Tutorial

    Exercise 1: Raster tracing

    Exercise 2: Batch vectorization

    ArcScan for ArcGIS software has the tools you need to convert yourscanned raster images into vector-based GIS layers. This process can beperformed interactively or in an automated fashion.The easiest way to learn how to use ArcScan is to complete the exercises inthis tutorial.Exercise 1 shows you how to set up the raster snapping options andenvironment, snap to raster cells, and trace raster cells to create line andpolygon features.Exercise 2 teaches you how to edit a raster layer to remove unwanted cells,apply vectorization settings, preview the vectorization, and generate featuresusing the batch vectorization mode.Each of these exercises takes between 15 and 20 minutes to complete. Youhave the option of working through the entire tutorial or completing eachexercise one at a time.These exercises assume that the ArcScan for ArcGIS extension is enabled inArcMap and that the Editor and ArcScan toolbars are displayed. To enablethe extension, click the Tools menu, click Extensions, and check ArcScan. Toshow a toolbar, click the View menu, point to Toolbars, and click thetoolbars name.

  • 2 ARCSCAN FOR ARCGIS TUTORIAL

    Exercise 1: Raster tracing

    ArcScan makes it easy to create new features fromscanned raster images. This process can significantlyreduce the time it takes for you to incorporate raster datainto your vector database.In this exercise, you will generate features from a scannedparcel map by interactively tracing raster cells. You willbegin by starting ArcMap and loading a map document thatcontains the raster dataset and two shapefiles.

    Starting ArcMap

    Before you can complete the tasks in this tutorial, you muststart ArcMap and load the tutorial data.1. Double-click a shortcut installed on your desktop or use

    the Programs list in your Start menu to start ArcMap.2. Click the Open button on the Standard toolbar.

    3. Navigate to the ArcScanTrace.mxd map document in theArcScan directory where you installed the tutorial dataand select it (C:\ArcGIS\ArcTutor is the defaultlocation).

    4. Click Open.

    Changing the raster layer symbology

    Raster layers must be symbolized as bi-level images to usethe ArcScan tools and commands. You will change theraster symbology from stretched to unique values.1. Right-click the ParcelScan.img raster layer in the

    ArcMap table of contents and click Properties to displaythe Layer Properties dialog box.

    2. Click the Symbology tab on the Layer Properties dialogbox.

    2

    3

    4

    2

  • ARCSCAN FOR ARCGIS TUTORIAL 3

    3. In the Show box, click the Unique Values display option.4. Click OK.

    Locating the trace area

    Spatial bookmarks are named extents that can be saved inmap documents. Creating a bookmark for areas that youvisit frequently will save you time.You will now zoom to a spatial bookmark created for thisexercise.1. Click Bookmarks and click Trace lines to set the current

    view to the edit area of the exercise.

    When the display refreshes, you should see the trace area.

    4

    3

    1

  • 4 ARCSCAN FOR ARCGIS TUTORIAL

    Start editing

    The ArcScan extension is only active in an edit session. TheStart Editing command enables you to begin an edit session.1. Click the Editor menu on the Editor toolbar and click

    Start Editing to begin the edit session.

    Setting the raster snapping options

    Raster snapping requires settings that influence thebehavior of the tracing. These options are set in the RasterSnapping Options dialog box.1. Click the Raster Snapping Options button on the

    ArcScan toolbar to open the Raster Snapping dialog box.

    2. Set the maximum line width value to 7. This setting willensure that you are able to snap to raster cells thatrepresent the lot boundaries.

    3. Click OK.

    2

    3

    1

    1

  • ARCSCAN FOR ARCGIS TUTORIAL 5

    1

    4. Click the Editor menu and click Snapping to open theSnapping Environment dialog box.

    5. Click the plus sign next to Raster to expand it.6. Check the Centerlines and Intersection options for raster

    snapping.

    Creating line features by tracing raster cells

    Now that you have set up your raster snappingenvironment, you are ready to begin tracing the raster cells.You will use the Vectorization Trace tool for this step.1. Click the Vectorization Trace button on the ArcScan

    toolbar.

    2. Move the pointer until it snaps to the intersection of thelot boundaries and click to start tracing.

    5

    6

    4

  • 6 ARCSCAN FOR ARCGIS TUTORIAL

    3. Point the Vectorization Trace tool downward and click tostart creating the line feature.

    4. Continue to point and click with the Vectorization Tracetool to trace the exterior boundary of the lots.

    5. Once you have finished tracing around the lotboundaries, press F2 to finish the sketch.

    A line feature now represents the exterior boundaries of thescanned parcel lots.

  • ARCSCAN FOR ARCGIS TUTORIAL 7

    2

    Creating polygon features by tracing raster cells

    Now that you have successfully traced raster cells tocreate line features, you will create polygon features usingthe Vectorization Trace tool.1. To get a better view of the area that will be traced, you

    need to zoom to the bookmarked extent called Tracepolygons. Click Bookmarks and click Trace polygons.

    Changing the edit target layer

    You must change the edit target layer from ParcelLines toParcelPolygons to create polygon features while tracing.1. Click the Target drop-down on the Editor toolbar and

    click ParcelPolygons.

    2. Click the Vectorization Trace button on the ArcScantoolbar.

    3. Move the pointer until it snaps to the lower-left corner oflot 061 and click to start tracing.

    1

    1

  • 8 ARCSCAN FOR ARCGIS TUTORIAL

    4. Point the arrow toward the lower-right corner of the lotand click to start creating the segments of the polygonfeature.

    5. Continue to trace the lot boundary in a counterclockwisedirection.

    6. When the cursor has returned to the starting point of thetrace, press F2 to complete the polygon.

  • ARCSCAN FOR ARCGIS TUTORIAL 9

    2

    1

    Finishing your edit session

    Once you have finished tracing the raster cells and havedisabled the Vectorization Trace tool, you can stop editingand complete the exercise by saving your edits.1. Click the Editor menu and click Stop Editing.

    2. Click Yes to save your edits.

    In this exercise you learned how to set the raster snappingoptions and environment, snap to raster cells, and traceraster cells to create new line and polygon features. Thesesteps covered the main components of the raster tracingprocess. The next exercise will show you how to edit araster layer and automatically generate features for anentire raster layer using the batch vectorization tools.

  • 10 ARCSCAN FOR ARCGIS TUTORIAL

    In this exercise, you will edit a scanned parcel map toremove cells from the raster that are not in the scope of thevectorization. Once the raster has been cleaned up, you willgenerate features using the batch vectorization mode. Youwill begin by starting ArcMap and loading a map documentthat contains the raster dataset and two shapefiles.

    Starting ArcMap and beginning editing

    Before you can complete the tasks in this tutorial, you muststart ArcMap and load the tutorial data.1. Double-click a shortcut installed on your desktop or use

    the Programs list in your Start menu to start ArcMap.2. Click the Open button on the Standard toolbar.

    Exercise 2: Batch vectorization

    3

    4

    3. Navigate to the ArcScanBatch.mxd map document inthe ArcScan directory where you installed the tutorialdata and select it (C:\ArcGIS\ArcTutor is the defaultlocation).

    4. Cl