I'm using ArcMap 10. I have a point dataset and a .flt raster. For each point I want the sum of the raster values that lie within a certain radius of each point. i.e. I want to extract values within a given radius around each point and then sum them for each point. I just can't work out how to do it!
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1 Answer
If you have a Spatial Analyst license, you could buffer your points by your desired radius. Then run 'Zonal Statistics as Table' using your point buffers as your zone features and the FID field as your zone field. Finally, join your point layer to your zonal stats table using the FID column.
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2This works fine provided all points are at least twice the buffer distance apart. Usually, you're better off just extracting the values of a focal sum grid at the desired points: then there's no problem at all with buffer overlaps (and the algorithm is usually a lot faster).– whuberCommented Mar 27, 2012 at 23:01
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1Thanks for the replies. How would I extract the values of a focal sum grid at the desired points??– HughStCommented Mar 27, 2012 at 23:48
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@whuber Ah.. I've wasn't familiar with the focal stats tool. Good to know. Thanks!– CyrusCommented Mar 28, 2012 at 16:10
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Hugh, ArcToolbox / Spatial Analyst Tools / Extract Values to Points should do it.– whuberCommented Mar 28, 2012 at 16:26