extraction from raster data by mask

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07-27-2011 12:22 PM
EricStrobl1
New Contributor
Hi,

I am extracting from a raster data set by mask with a polygon shape file as the mask - but the strange thing is that the masked raster data seems to have changed the values of raster data.  For example, I know that within this polygon that there are many zero values, but these all disappear when I mask out the area with the polygon. Can anybody tell me what might be happening here?   (by the way, a friend of mine seems to be doing the same thing with the same data, but not does not have the problem).

thanks

eric
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1 Reply
HosamEl-Sharkawi
New Contributor
Eric,
The values changed due to stretching techniques but the raw data will be the same as the source raster.
Regards,
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