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I have 6 rasters with pixel values ranging from 0 to 1. I want to extract the highest pixel values from each raster to create a new raster, but also have a way to show which raster the highest value came from.

For example, pixel N has a value of 0.1 in Rast1, 0.5 in Rast2, 0.4 in Rast3. I would like to keep the value from Rast2 in the output raster and somehow keep track that this value came from Rast2 not Rast 1 or 3. Ultimately I would like to symbolize the raster by which original file it came from.

Is this possible?

  • Raster data can only store one value per cell. If you need to store multiple values for your analysis, consider a vector based approach. What is your ultimate objective? Why do you need to keep track of which raster has the highest value? – Aaron Jan 7 '16 at 0:23
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    Make 2 rasters... one with a value that identifies the raster that will be used and one with the value used. Con should be able to do that but the statement will be quite long. – Michael Stimson Jan 7 '16 at 0:25
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    No need for Con, use highest position tool, see answer below. – user2856 Nov 8 '16 at 2:35
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There might be a number of workarounds one way you can do this is in a 3 step process.

  1. Step 1. Use cell statistics tool in ArcGIS, to make a raster of maximum values from input raster1, raster2 and raster3.<- let step1 output = MaxValue
  2. Step 2. Use Conditional calculation: Con((Raster1 > Raster2)& (Raster1 >Raster3),1,Con((Raster2> Raster1)&(Raster2>Raster3),2,Con((Raster3>Raster1)&(Raster3>Raster2),3,0))) <- let step2 output = MaxRaster
  3. Step 3. Use Combine raster tool to compine rasters MaxValue and MaxRaster.

That should give you the maximum values with the rasters they came from in another column. 1 = from raster1, 2 = from raster2, 3 = from raster3 and 0 if for some reason the values are equal. Note: This becomes a tedious solution if you have more than 3 rasters, if that is the case may be a python scripting solution with arcpy is better suited.

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  1. Per the accepted answer, use the Cell Statistics tool to determine the maximum value of the rasters;
  2. Rather than an unwieldy Con function, use the Highest Position tool to determine which raster had the maximum value.
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    +1. This should be the answer, because Highest Position is designed to do precisely what the question asks for. – whuber Nov 8 '16 at 16:23

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