Reclassify areas of a classified raster dataset

Summary

This article describes a workflow to reclassify incorrectly classified raster pixel values in ArcGIS Pro.

Note:
This workflow does not require the Image Analyst extension. For a solution which leverages Image Analyst tools, refer to ArcGIS Pro: Edit thematic and classified pixels.

Procedure

1. Create a polygon feature class.
   1.  Create features which cover the extent of the raster areas which must be reclassified.
2. Use the Polygon to Raster tool to rasterize the polygon feature class.
   1. Define Cellsize using the original classified raster. This ensures that the output raster aligns with the original, classified raster.
3. Remap pixel values in the new raster to the desired classification value.
4. Use the Mosaic to New Raster tool to merge the new raster with the existing classified raster.