Help - Editor: How do you designate an empty line field as a Target in ArcMap 10??

ArielleSimmons — Wed, 20 Mar 2013 15:14:03 GMT

Hi,

I am trying to do the steps below (using Editor and ArcScan...w/ArcInfo 10 license). I am stuck on Step #2. I can't seem to find a way to get the ArcScan toolbar to recognize the Raster layer (which is in the same fgdb as the empty line feature which I created).

The ArcScan toolbar just remains grayed out...I don't know what I'm missing...

Any idea what might be up??

Here are the steps I've followed (from here: forums.arcgis.com/threads/11744-Polygon-to-centerline)

Using ArcScan to create centerlines from polygons (roads, paths, water bodies):

Step 1: Create a raster from your polygons.
- Use �??features to raster�?� or �??polygon to raster�?� tool. Make sure that cell size for new raster is small enough that even narrowest sections of a polygon get represented. For sidewalks, cell size of 3ft worked, default cell size of ~10ft did not (missing parts of path, disconnected)
- Imperative to Reclassify resulting raster into a �??bi-level image�?�, with all useful pixels (the ones you wish to convert to lines, typically non-0 values in your raster) reclassified as 1, and NoData reclassified as 0. After that, �??You can use either the ArcMap Unique Values or Classified rendering options to separate the raster into two colors�?�; raster must be symbolized in two unique colors.

Step 2: Set up editing environment (ArcScan works inside Editing environment only)
- Create a new empty line file in which newly created centerlines will be saved
- Enable ArcScan extension under Customize-Extensions pulldown menu, if you haven�??t yet.
- Start an Edit Session, designating the new empty line file/gdb as target; remember to create a feature template for new empty line fine
- Add ArcScan toolbar (Customize �?? Toolbars)

Step 3: Use ArcScan to create lines.
- If everything is set up correctly, the rasterized polygons will show up as an option in ArcScan�??s pulldown menu for �??Raster:�?� target.
- Click Vectorization pulldown menu, chose �??Generate Features�?�
- Check to see that all of your original polygons generated a center line. Some of my shortest paths do not generate a centerline; turning Noise Level to 0 in Vectorization pulldown-Vectorization Settings helps some of these centerlines to come through; using �??Show Preview�?� in Vectorization pulldown helps you see whether changes you�??ve made to settings and options are having an affect (hit Apply for every change to show in preview)
- For ESRI Help on ArcScan: http://help.arcgis.com/en/arcgisdesk...0001000000.htm

topic Help - Editor: How do you designate an empty line field as a Target in ArcMap 10?? in Data Management Questions

Help - Editor: How do you designate an empty line field as a Target in ArcMap 10??