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I would like to clip a raster to follow the shape of a river, which has lots of meaders and bends. I have created a buffer for the river of 300m and was hoping to use this to clip the raster. However, the raster clips to a rectangle shape. Is there a way to change this? I am using ArcGIS Pro.

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    Clipping with an irregular polygon is a vector thing. What you want is to mask in a 1/nodata raster generated from your irregular polygon (Con can do the masking) – Vince Jul 10 '20 at 11:54
  • Thank you. This worked great. – xxenox Jul 10 '20 at 12:26
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Solution: Use Extract by Mask.

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