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Merge Multiple Rasters Using Cell Statistics

A simple and elegant way to merge multiple raster datasets in ArcMap is to use Cell Statistics in Spatial Analyst Tools. While there are many ways to merge raster datasets in ArcMap, the most common, Mosaic, can be tricky, as an empty raster must first be created into which the raster tiles are merged. Getting any parameters wrong here could mean a failed merge.

A map I’ve recently created required me to merge several SRTM raster tiles. Normally I’d jump to Mosaic to merge the raster tiles, but remembering this can often be a slow and problematic process, I looked for an alternative method. This search led me to discover that Cell Statistics (Spatial Analyst Tools > Local), a tool I’ve never used before, can merge rasters quickly and without fuss.

Using Cell Statistics to merge raster datasets

  1. Open Cell Statistics (Spatial Analyst Tools > Local)
  2. Select all the rasters you wish to merge
  3. Select the output location and file name
  4. Set Overlay statistic to MAXIMUM
  5. Check the Ignore NoData in calculations box.
  6. Optionally, you can set the Processing Extent under Environments to Union of Inputs.

Click OK and your raster datasets will be merged.

ArcMap Cell Statistics dialogue box.

ArcMap Cell Statistics dialogue box.

 

Four SRTM raster dataset tiles before being merged using Cell Statistics in ArcMap.

Four SRTM raster dataset tiles before being merged using Cell Statistics in ArcMap.

 

Four SRTM raster dataset tiles after being merged using Cell Statistics in ArcMap.

Four SRTM raster dataset tiles after being merged using Cell Statistics in ArcMap.

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