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Blank spaces in the map to a feature class in arcmap


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I have some basic doubts in Arc-Map. Please answer

I want to convert the blank spaces within the map into another feature class. How could that be done?

I have roads and forests in the map now. I want the remaining blank spaces to be like a feature class like polygons or even as raster. How is it possible?

I tried by making a feature class (polygon) covering entire study area and then subtracted roads and forests from this using raster calculator. I then realized it doesn't subtract spatially instead based on the attribute values :( 



Edited by Maya007
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