I just ran the ArcMap Mosaic to New Raster tool to merge 5 rasters of pH levels in different farms. These individual rasters have values that are decimals. When I run the tool, the output is in whole numbers. Why is this occurring and how do I change it? Could it be an environment setting, a tool property setting, or a data property setting? Nothing looks even remotely out of place. enter image description here

  • What specific type of raster is the mosaic? Right click raster layer > Source > Pixel Type & Pixel Depth – Aaron Mar 15 '18 at 13:02

You need to change the Pixel Type (optional) to 32_Bit_Float or 64_Bit, if you want decimals:

32_BIT_FLOAT—A 32-bit data type supporting decimals

64_BIT—A 64-bit data type supporting decimals.

enter image description here

By default it is 8_BIT_UNSIGNED, which means unsigned integer.

  • Ah, that was totally the problem. The rasters being merged were all 32 bit float. I just assumed the raster output file would be the same as the inputs. – gwydion93 Mar 15 '18 at 13:19
  • @jcbridwe Glad it solved the problem. Actually the downside of using 32_Bit_Float is that the file size will also increase. – ahmadhanb Mar 15 '18 at 13:22

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