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I have a set of lat/long ccordinates for which I wanted to pull corresponding BioClim (1-19) values. I first used ArcMap, without interpolating, and came up with a set of data. I then used R's 'raster' package - both using the 'simple' method and the 'bilinear' interpolating extraction method, and though they were in the ballpark, neither values matched what I got from the ArcMap 'Extract raster values to points' procedure. Has anyone ever had this problem? Here are some of my coordinates: 45.367183 6.028633, 45.39175 6.122389, 45.392611 6.11675, Thanks for any help you can give!

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Please provide more information; in particular, exactly which commands did you use with ArcMap and R (the ArcMap command has various options to specify different interpolation options) and what exactly were the values you obtained? – whuber♦ Mar 17 at 15:51

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