I am using ArcGIS 10.1.

I am searching for a solution to calculate a raster. The values are like: 0.2 0.6 5.3 i.e. How can I now get 0.2 as 0 and 0.6 to 1 and 5.3 to 5? In the end integer numbers. The "roundup" and "rounddown" functions are worse to do this.

Thanks for any hints.


  • I know this might be late but does int(yourraster + 0.5) really give the result? I think what it does is that it simply strips the decimal place (rounding down always). So if you use int(5.9) it will simply return 5 as the result. But shouldn't a round function yield 6 as result? In Python, the function int(round(5.9,0)) will yield 5 as a result, but not sure how this is achieved within the raster calculator of ArcGIS. – gabz Dec 26 '14 at 0:17
  • No, Int(raster + 0.5) will round up or down to the nearest integer, not truncate down. i.e int(5.9 + 0.5) is equivalent to int(6.4) which equals 6. In python, try: print int(5.9 + 0.5). Python will print 6. Your comment that "in Python... int(round(5.9,0)) will yield 5" is also incorrect, it will return 6. – user2856 Mar 23 '15 at 20:31
  • I wonder how to round the raster cell values in Python? – HuH Jun 17 '16 at 13:09
  • This does not provide an answer to the question. Once you have sufficient reputation you will be able to comment on any post; instead, provide answers that don't require clarification from the asker. - From Review – jbchurchill Jun 17 '16 at 13:33

Int(yourraster + 0.5) will round to the nearest integer.

For rasters that may contain negative values:

Con(yourraster < 0, Int(yourraster - 0.5), Int(yourraster + 0.5))
  • This only works if your raster contains positive values only. – mikeck Jun 15 '16 at 15:55

If you have multiple values to reclassify from a single raster then I suggest to use "arcpy.sa.Reclassify" tool. For example:

outras = arcpy.sa.Reclassify(inras,"Value",RemapValue([0.2,0],[0.6,1],[5.3,5]),"DATA")
  • Although this method is very flexible, it is much harder, more error-prone, and more time-consuming than Luke's answer. – whuber Apr 29 '13 at 14:44
  • Not my solution. ;-) – luigi Apr 29 '13 at 15:01

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