[GIS] How to extract raster values around points

arcmapraster

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!

Best 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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[GIS] Extraction of raster cell values based on ‘rgeos’ and ‘raster’ buffering approaches in R

By making a buffer you approximate the distances (as you do not get a true circle, but a polygonal approximation of one). You can improve the rgeos answer by increasing the number of segments of the circle with the "quadsegs" argument:

nbg.bff2 <- gBuffer(nuremberg, quadsegs=50, width = 20000)
table( unlist(extract(germany, nbg.bff2)) )

  0   1 
118  91

[GIS] Extract values from raster by using polygons

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.

Best Answer

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[GIS] Extract values from raster by using polygons

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