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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | GISList: Raster Intersections ? |
| Date: |
04/17/2003 09:40:00 AM |
| From: |
Monica Barricarte |
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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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