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I am in the final stages of a landcover classification and need to reclassify thematic raster values that are inside different polygon masks, while leaving the values outside as they are.

Can I do this with raster calculator? And, if so, how?

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Apologies. I meant to add that I need to do this is in ArcGIS. – Simon Aug 21 '13 at 13:45
check this question:… – A.R Aug 21 '13 at 14:08
Thanks, but I need to reclassify specific classes inside the polygon mask, rather than make all the cells inside the mask one value. – Simon Aug 21 '13 at 14:36
I'm voting to keep it open, as I feel it is sufficiently different from the candidate question. – Devdatta Tengshe Aug 21 '13 at 15:22
Reclassify the entire raster, then replace the original values by the reclassified values using Con. For details, search our site for applications of Con. – whuber Sep 27 '13 at 15:48

Because the Raster Calculator is a spatial analyst tool, you can utilize the Mask environment.

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From there, you can use a variety of commands to perform the reclassification: common ones include Con, Pick, Is Null and Set Null, based on your needs.

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To check if a specific spatial analyst tool honors the Mask environment, simply scroll down to the bottom of the help page and check the available environment settings.

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