ARCSCAN TUTORIAL PDF
You can take any image, and you can vectorize it with ArcScan. This means you’ll spend less time digitizing and more time doing other. Arcscan Tutorial – Download as PDF File .pdf), Text File .txt) or read online. Quick-start tutorial. • Exercise 1: Raster tracing. • Exercise 2: Batch vectorization. 2. ArcScan for ArcGIS software has the tools you need to convert your scanned.
|Published (Last):||12 July 2004|
|PDF File Size:||7.31 Mb|
|ePub File Size:||15.35 Mb|
|Price:||Free* [*Free Regsitration Required]|
Interactive vectorization Exercise 2: Automatic vectorization Copyright Esri. Interactive vectorization ArcScan makes it easy to create new features from scanned raster images. This process can significantly reduce the time it takes you to incorporate raster data into your vector database.
ArcGIS Tutorial Data Setup In this exercise, you will generate features from a scanned parcel map by interactively tracing raster cells. You will begin by starting ArcMap and loading a map document that contains the raster dataset and two layers. Setting up the ArcScan environment Prerequisite: Click the Open button on the Standard toolbar. Tutprial to the ArcScanTrace.
ArcScan tutorial | Geospatial / GIS | Pinterest | Remote sensing and Remote
To use ArcScan, you need to enable the extension. Raster layers must be symbolized as two-color images to use the ArcScan tools and commands.
You will change the raster symbology from stretched to unique values.
The Layer Properties dialog box appears. Click the Symbology tab on the Layer Properties dialog box. Click Unique Values in the Show box. Setting the raster snapping environment ArcScan is designed to work in conjunction with the ArcMap editing environment and is only active when an edit session has been started. You need to set some options for snapping while editing and using ArcScan. Click the Editor menu and click Options. ArcScan uses the classic editing snapping environment rather than the Snapping toolbar.
Click the General tab. Check Use classic snapping. When you enable classic snapping, it disables the Snapping toolbar’s snapping environment for use in editing. Therefore, once you have completed your work with ArcScan, you should reenable the Snapping toolbar by unchecking the Use classic snapping box. The ArcScan extension is only active in an edit session. The Start Editing command allows you to begin an edit session.
Click the Editor menu on the Editor toolbar and click Start Editing. Choose to start editing on the file geodatabase workspace and click OK. Raster snapping requires settings that influence the behavior of the tracing. These options are set on the Raster Snapping Options dialog box. Set the maximum line width value to 7. This setting will ensure that you are able to snap to raster cells that represent the lot boundaries. Click the Editor menu, point to Snapping, then click Snapping Window.
Click the plus sign next to Raster to expand it. Check the Centerlines and Intersection options for raster snapping. You can close the window when you are done.
Now, you need to turn on SnapTips, which are pop-up messages that give you information on the type of snapping that is tutoriao as you move your pointer around the map. Click the Editor menu, point to Snapping, then click Options.
Creating line features by tracing raster cells Now that you have set up your raster snapping environment, you are ready to begin tracing the raster cells.
You will use the Vectorization Trace tool for this step. Click Bookmarks and click Trace lines to arrcscan the current view to the edit area of the exercise. When the display refreshes, you should see the trace area.
Click the ParcelLines line feature template in the Create Features window. This sets up the editing environment to create new features in that layer using the default attributes for that template. Click Vectorization Trace arcsfan on the ArcScan toolbar. Move the pointer until it snaps to the intersection of the lot boundaries and click to start tracing.
Point the Vectorization Trace tool downward and click to start creating the line feature.
ArcScan Tutorial. Copyright Esri All rights reserved.
Continue to point and click with the Vectorization Trace tool to trace the exterior boundary of the lots. Once you have finished tracing around the lot boundaries, press F2 to finish the sketch.
A line feature now represents the exterior boundaries of the arvscan parcel lots. Zoom to the bookmarked extent called Trace polygons to get a better view of the area that will be traced.
Exercise 1: Interactive vectorization
Click Bookmarks and click Trace polygons. Click the ParcelPolygons polygon feature template in the Create Features window. You must change the active feature template to ParcelPolygons to create polygon features while tracing.
Click the Vectorization Trace tool on the ArcScan toolbar. Move the pointer until it snaps to the lower-left corner of lot and click to start tracing. Point the arrow toward the lower-right corner of the lot and click to start creating the segments of the polygon feature.
Continue to trace the lot boundary in a counterclockwise direction. When the cursor has returned to the starting point of the trace, press F2 to complete the polygon. Once you have finished tracing the raster cells, you can stop editing and complete the exercise by saving your edits. Click the Editor menu on the Editor toolbar and click Stop Editing. Click Yes to save your edits. To continue to the next exercise in the ArcScan tutorial, click Exercise 2: These steps covered the main components of the raster tracing process.
The next exercise will show you how to edit a raster layer and automatically generate features for an entire raster layer using the batch vectorization tools. Automatic vectorization In this exercise, you will edit a scanned parcel map to remove cells from the raster that are not in the scope of the vectorization.
Once the raster has been cleaned up, you will generate features using the batch vectorization mode. You will begin by starting ArcMap and loading a map document that contains the raster dataset and two shapefiles. This exercise builds on the ArcMap settings specified in the previous exercise. You need to have the ArcScan extension enabled, classic editing snapping enabled, and the ArcScan and Editor toolbars displayed.
Navigate to the ArcScanBatch. If you still have the map document open from the previous exercise and are prompted to close it, do so without saving your changes. Preparing the raster for vectorization: Raster painting When performing batch vectorization, it is sometimes necessary to edit the raster image prior to generating features.
This process is referred to as raster cleanup and involves the removal of unwanted cells from the Copyright Esri.
ArcScan provides the tools to perform raster cleanup. You will now use the Raster Cleanup tools to remove unwanted text from the ParcelScan image. Click Bookmarks and click Raster cleanup to set the current view to the edit area of the exercise.
Click the Erase tool on the Raster Painting toolbar. Click and hold to erase the text Continue to erase the text with the Erase tool until it has been completely removed from the image. In addition to the Erase tool, the Raster Painting toolbar supports another tool designed to erase cells. This tool is called the Magic Erase tool, and it allows you to erase a series of connected cells by simply clicking or dragging a box around them.
Click the Magic Erase tool on the Raster Painting toolbar. Drag a box around the text located in the center of the parcel lot to remove it. The text is now removed from the raster. Cell selection In the previous steps, you learned how to use the Erase and Magic Erase tools to remove unwanted cells from the raster image. However, if the image you are working with requires much cleanup, these techniques could be time consuming. To help streamline this process, you can use the cell selection tools in conjunction with the raster cleanup tools.
Zoom to the bookmarked extent called Cell selection to get a better view of the edit area. Click Bookmarks and click Cell selection. In the Select Connected Cells dialog box, type a value of for the total area of raster pixels. This expression will select all the cells that represent text in the raster. The cells that represent the text in the raster are now selected.
The selected cells are now erased.
ArcScan Tutorial. Copyright Esri All rights reserved. – PDF
These settings can vary depending on the type of raster data you are working with. Once you have determined the appropriate settings for your raster, you can save them within the map document or to a separate file.
You will use the Vectorization Settings dialog box to apply the settings. Click the Vectorization menu and click Vectorization Settings to open the Vectorization Settings dialog box.
You will now modify the vectorization settings to ensure optimal results when generating features.