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I'm using ISurface.GetElevation on a Raster to get the elevation for a specific lat/lon.

I have to do this for a huge set of datapoints.

Currently i'm testing with a dataset of 10.000 items which takes Esri over 30 seconds but is executed by GlobalMapper within half a second.

Is there any other way to quickly retrieve the elevation (bi. interpolated if needed) using Esri ArcObjects function ?

I'm working in C#

Thank you for your help!

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I also tried using IFunctionalRaster2.get_Z(x,y) which is quicker (4x) but still much slower then the GlobalMapper implementation. – invalidusername Mar 16 '12 at 14:04

1 Answer

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If it is one raster, I usually use IIdentify2:Identify method, to get the cell value, and get the height. ISurface.GetElevation gives you the interpolated value, and if your cell size is large, then there might be a large difference between the two. Otherwise, It usually is good enough.

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Identify works but is really slow and i need the interpolated value, so i'm using IFunctionalRaster2.get_Z() and ISurface.GetElevation() now. They are quicker, but nothing compared to the speed i get with my .Net wrapped GlobalMapper COM library. 10.000 items using Identify takes 30secs were GlobalMapper does this in half a second! I'm looking for a speedy way to get interpolated Elevation that matches the speed of GlobalMapper. – invalidusername Mar 16 '12 at 17:08
Forget to mention that i'm also looking at multiple rasters. Not just one. – invalidusername Mar 16 '12 at 17:08

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