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| GeoCommunity Mailing List |
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| Subject: | Re: [gislist] grid cu[t]ting |
| Date: |
04/08/2005 02:00:01 PM |
| From: |
Quantitative Decisions |
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At 11:04 AM 4/8/2005 -0700, Sayyed. B. Fatemi wrote:
>Dose anyone know how I can clip a specific part of a grid in
>Arcview 3.2.
Grid clipping is an operation almost everyone needs to
perform. Ultimately, the clip region is represented in the GIS (either
explicitly or implicitly) as an indicator grid of ones, with zeros (or
NoData values) elsewhere. Multiplying a grid by an indicator effectively
"clips" it. This is a method that should work with any raster GIS, ArcView
3.x or otherwise.
Learning how to use indicator grids effectively is a key to exploiting the
full power of GIS. With them, one easily and efficiently performs many
seemingly complex map operations, such as partitioning regions according to
their intersections with regions in another layer.
Cheers,
Bill Huber
Quantitative Decisions
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