Extract values of raster within county boundary

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05-23-2022 01:28 AM
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Deepa
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New Contributor III

Hi,

I would like to remove  raster values outside a polygon file. The polygon file is the county boundary. I see that i can use extract by mask or clip but then the output raster image still gets a value called Nodata outside the county boundaries. I would like the removed place (outside county area) to be completely removed from the raster image. I dont want those pixels to show Nodata value when i identify using Idenitfy tool. How can i do that?

My goal is to then convert this raster file into to a text file and then use R to do further analysis. I see there are so much nodata in the text file if i do like this and i dont want NoData in my text file. Is there some way to fix this in ArcMap itself? 

 

Thank you!

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