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I have about 300 rasters that I need to find the overlap and sum of to find 'hotspots'. I set each raster value to 1 and used the Mosaic to New Raster tool to create a new raster. I tested this with two files (test), the test raster has a value of 2 where the other two rasters overlapped.

How do I manage to find all the overlapping rasters and add them together in ModelBuilder?

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Use the Cell Statistics tool :

Calculates a per-cell statistic from multiple rasters.

The available statistics are Majority, Maximum, Mean, Median, Minimum, Minority, Range, Standard deviation, Sum, and Variety.

Use the SUM statistic and ensure Ignore NoData is ticked and set the output extent environment to Union of inputs

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  • Unfortunately through model builder, it did not add together the rasters that overlapped, the value is still equal to 1.
    – Lael
    Commented Jul 16, 2019 at 1:43
  • Did you use the SUM statistic and ensure Ignore NoData is ticked?
    – user2856
    Commented Jul 16, 2019 at 1:48
  • Yes I did, it seems like the output is the exact same as the input rasters
    – Lael
    Commented Jul 16, 2019 at 2:55
  • Weird, I just did this yesterday with 800 rasters. Do the rasters all have the same extent?
    – user2856
    Commented Jul 16, 2019 at 4:03
  • No they don't have the same extent, I put up another photos of where are my rasters are located on the map. I need to figure out if they over lap, and if they do, then add the rasters together.
    – Lael
    Commented Jul 16, 2019 at 5:14

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