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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | GISList: re: Raster Intersections ? |
| Date: |
04/16/2003 06:55:01 PM |
| From: |
Bernard.J.King .. us.mwhglobal.com |
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Many thanks to Andrea Laliberte for the solution to my problem!
Bernard J. King
Senior Designer
CADD/GIS Dept.
MWH
Portland, OR
503.220.5430 (direct)
503.226.7377 (office)
503.226.0023 (fax)
===============================================================
Hi Bernard,
You can do this with the Spatial Analyst. Before you add them together,
select Spatial Analyst>Options>Extent, then choose the largest extent of
either grid. I had some trouble if I did not do this. Fo the intersection,
select Raster Calculator from the Spatial Analyst, and you will see the
grids displayed in the raster calculator box. Double click on the first
grid, select +, then double click the second grid, then hit evaluate.
Basically , you just add them together. ArcGIs creates a temporary grid,
and you can right click and select Make Permanent.
If your grids are not boolean, you can use Spatial Analyst>Reclassify to
make them 0 and 1.
Hope that works, let me know if you need more help,
Andrea Laliberte
Ph.D. Candidate
Dept. of Forest Resources
Oregon State University
=================================================================
greetings--
I am using ArcMap 8.2 and Spatial Analyst....
I have 2 grids and I want an intersection of those grids,
similar to the
Boolean Intersection which is found in the Geoprocessing
Wizard....how can
I get that output grid?
I am not experienced with raster calculations, and I did
search around the
help files for Spatial Analyst.......to no avail...
Thanks in advance....
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