[vtkusers] How to import NASA SRTM DEM data into VTK

[Elvis Dowson]

Hi,
          Here is a brief description of the NASA SRTM DEM file. Can  
someone please give me some hints on how I can read this simple binary  
raster file and create a vtkSRTMReader class to produce a vtkImageData  
ouput, for further processing for reconstructing a 3D terrain surface.

Best regards,

Elvis Dowson

DEM File (.HGT)
The DEM is provided as 16-bit signed integer data in a simple binary  
raster. There are no header
or trailer bytes embedded in the file. The data are stored in row  
major order (all the data for row
1, followed by all the data for row 2, etc.).
All elevations are in meters referenced to the WGS84/EGM96 geoid as  
documented at http://
www.NGA.mil/GandG/wgsegm/.
Byte order is Motorola ("big-endian") standard with the most  
significant byte first. Since they are
signed integers elevations can range from -32767 to 32767 meters,  
encompassing the range of
elevation to be found on the Earth.
These data also contain occassional voids from a number of causes such  
as shadowing, phase
unwrapping anomalies, or other radar-specific causes. Voids are  
flagged with the value -32768.
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