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I have a raster with elevations above 2000m that I want to "cut" to 1800m.

I cannot quite figure out the correct string and most simple way to do this in the ArcGIS 9.3 raster calculator.

I tried to ceiling function without much luck; would an expression similar to IF([my_raster]>2000,1800,[my_raster]) do the trick?

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You might be looking for con. – whuber Apr 2 '13 at 17:45
Thank you - yes! – Peter Apr 3 '13 at 7:28
up vote 13 down vote accepted

You can use a conditional (Con) statement in the raster calculator or the con tool in ArcToolbox. The below statement is evaluated as [IF myrasters > 2000 THEN 1800 ELSE myraster]

Con("myraster" > 2000, 1800, "myraster")
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Cheers! Con([myraster] > 2000, 1800, [myraster]) worked perfectly. Thank you!! – Peter Apr 3 '13 at 7:28

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