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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | RE: GISList: Raster Intersections ? |
| Date: |
04/23/2003 08:15:01 PM |
| From: |
Neil Havermale |
|
|
http://www.redhensystems.com/mapcalc
-----Original Message-----
From: Monica Barricarte [mailto:monica-barricarte@ca.nacdnet.org]
Sent: Friday, April 18, 2003 12:36 AM
To: Bernard.J.King@us.mwhglobal.com
Cc: gislist@geocomm.com: Andrea.Laliberte@orst.edu
Subject: GISList: Raster Intersections ?
Mr King and Andrea could you please let me know how to intersect 2 raster
images-Grids? I need to learn that too, thanks in advance Monica
Bernard.J.King@us.mwhglobal.com wrote:
> 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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