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Improving the resolution of 90m SRTM data to 30m

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alanb

alanb

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If you are studying an area outside North America, you may be frustrated by not being able have higher than 90 metre resolution DEMs available. This would be important if you would like a backdrop for a large scale map (i.e. a nice hillshade) or would like to do same more detailed topographic analysis. I have read with great interest the following articles of the Web.

Valeriano et al. “Modeling small watersheds in Brazilian Amazonia with shuttle radar topographic mission-90m data” http://www.mamiraua....6/artigo_15.pdf
Keeratikasikorn & Trisiristayawong “RECONSTRUCTION OF 30M DEM FROM 90M SRTM DEM WITH BICUBIC POLYNOMIAL INTERPOLATION METHOD”
http://www.isprs.org...s/1_pdf/136.pdf
Grohmann “Resampling SRTM 03”-data with kriging”
http://grass.itc.it/...s_vol4-srtm.pdf

Each of these seem excellent methods for improving the resolution of 90m srtm to 30m through resampling and interpolation. However my maths and understanding of interpolation is limited to be able to work out how to do this in ArcGIS Spatial Analyst. While the actual data is not improved its representation and also its ability to be used in more refined topographical analysis is.

Has anyone accomplished this using ArcGIS Spatial analyst? Does anyone know which is the best interpolation Kriging? Bicubic polynomial?Regularized Splines with Tension (RST)? And if so what are good parameters to use within the tools?

This process would be extremely useful to thousands of ArcGIS users outside the US. Also developing a script/tool which one could input a SRTM and output a higher resolution one would be amazing.

Any help on this would be much appreciated.
Alan




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