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- Partially update a raster (a DEM) 1 answer
I have the following problem: I am currently working with Landsat 5 imagery from the tropics including quiet high cloud cover. I have classified raster images with the different land use categories I need and "Clouds" as well as "Cloud shadow" as categories where there appear on the image. I now extracted the "Clouds" and "Cloud shadow" parts of my classified image (Extraction toolset --> Extract by Attributes) and converted these to polygons. Now I have a layer with polygons for every cloud and every shadow of my classified image. I was hoping that I can now take a different classified image from the same year with less clouds in the areas where my original image has a lot of clouds and extract the data from this new classified image that falls within the polygons that I created. Then I wanted to take this new data and "overlay" my original classified image with the extracted data that falls within the area that is covered by clouds. The result would be that I replaced the areas covered by clouds with the data from the other classified image of the exact same area. However I can not find any tools to do this overlay-like operation. If someone knows how to extract data from a classified Raster image using polygon files (similar to a mask) and how to replace the data from the original classified raster image with the newly obtained data I would highly appreciate your help.