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After clasiification you can Convert Raster to Polygon in Arcgis and then Open the attribute tables to fetch the area of each class of polygons.


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American Fact Finder contains searchable tables based on census data that should have all the information you are looking for.


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The closest tool to what you describe is the Live Statistics plugin. It can be configured to compute different statistics and shows the results in a status bar in the bottom left corner of the main window


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You can use the r.series GRASS command in QGIS to accomplish this.


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The method I have used to do this makes a bad assumption (that population is evenly distributed across the block). However it is AFAIK the only way to do it. You can use the percentage of the area of split precincts occurring in different districts to get the estimated population values that you want. The method works like this. Create a field to ...


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Based on the added information in your comment, I would suggest to use the GRASS module r.in.xyz. There are some issues lately with the QGIS GRASS plugin, so I'd work directly in GRASS, standalone. First, when you start GRASS, you're required to setup the GRASS database, and LOCATION. The LOCATION is defined by the coordinate projection parameters. Make sure ...



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