CGIAR SRTM 90m Digital Elevation Data

An alternative SRTM dataset has been developed by the CGIAR consortium for spatial information (CGIAR-CSI). This dataset is also based on the original SRTM dataset published by the U.S. Geological Survey; however it has been post-processed by a number of additional advanced voids filling algorithms as well as utilizing a number of better auxiliary DHM-datasets. Please refer to the CGIAR website for more information on this dataset http://srtm.csi.cgiar.org/.

The spatial coverage of this dataset is the same as for the original SRTM data – as described in the section 2.1 above.

At EMD we have evaluated the differences in the datasets through calculations on three different sites, where all relevant data except the DHM model is replaced. The results are shown in the table below, where the annual energy yields from the proposed wind farms are evaluated. The AEP from the original contour model is set to 100%; these are typically based on data from the local ordinance survey offices. The calculation model used is WindPRO/WAsP.

Table: Data Sources in the Viewfinder Panoramas dataset.

Site	Original DEM	SRTM v. 2.1	SRTM/CGIAR
Wishek, USA	100%	99.87%	99.86%
Ometepe, Nicaragua	100%	99.91%	99.77%
Alps	Local 1:25000 and 1:500000; Russian 1:100000; SRTM (limited use only)