Thanks for the various suggestions on working with SRTM data a while ago.
In the end I followed the advice of Tim Makins and others and downloaded the 3DEM program.
http://www.visualizationsoftware.com/3dem/downloads.html
It was a really good program, especially for the price (free). I combined the data from 6 tiles very quickly and easily. One issue was that it wouldn't export data to an ASCII grid once you had reprojected it to WGS84 in 3DEM when the data was in the southern hemisphere.
As my ultimate objective was to get it to xyz so I could extract point elevations from an irregular polygon (I have better data for some areas), I went down the following path.
I exported it without reprojection to a USGS ASCII grid easily from 3DEM.
I then imported this to a mapInfo grd file using an old version of Vertical mapper.
I then exported this data as an xyz file (the coordinate numbers should be intact at this stage, even if both programs thought they were in a different projection)
I opened the text file in MapInfo and created points using a WGS84 projection.
This gave me almost 8 million elevation points to fill in the areas where I was missing data from the more detailed studies.
Thanks for all the suggestions on file reading etc, but in the end I just didn't have to do it myself.
r
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Robert Crossley
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