I performed a supervised land-use classification with Erdas. Landsat data was used in ArcGIS to Digitize urban areas as polygon shapefile. I want to insert these polygons into the land-use raster data. How can I do this with ArcGIS?
Try the following workflow:
- Add a new field in your polygon layer "Value". Make sure the value is > any of the land use values.
- Use Polygon to Raster (Conversion). Make sure to specify the value field you created in step 1. Also make sure to specify the same cell size as your land use raster.
- Use Cell Statistics (Spatial Analyst) with a "MAXIMUM" statistic to combine the two raster datasets. In the environment tab on the tool GUI, specify the land use raster as the "Processing Extent".