T3D3 and SRTM DATA files

3 Arc , 90 meter DEM data is available from

For South Africa use a file where the South coordinate is bigger than you center coordinate.
 25. 5 degree South,   East 31.3 , use S26E031

Unzip the file, and store it in the SRTMDAT Directory.

One has to CONVERT the SRTM file format to the binary DEM file format which is used by the T3D2 code.

Then use the GO SCAN button and create a new site, which got the 3D elevation data with the map section cut out and overlaid.

How to do a scan and create a new Site inT3D2 using SRTM DAT files

In T3D2 use SETUP and define a directory for the input SRTM DAT data and for the output DEM data
Put your SRTM DAT files SRTMDAT directory

How to use T3D2 Toolbar option


A file selection pops up. Locate in the file-chooser your input SRTM Data file with a hgt extension which you want to convert.
The file gets converted to a DEM file..
Once converted , use the T3D2

SRTM DEM choice button.

Choose one of the DEM files

Enter the Center coordinates of your flying site In decimal degrees. Like -31.1234 South is negative. West is negative . And define the amount of strips to each side

Change the default site name, if you want
A directory with that name gets created under the sites directory
The code shows some output as it tries to find the site inside the dem data.

Once done, exit, close down the program. Restart and now you should find the new created site in the site selection multichoice. Select the new site


Generates from an IGC file the topo dem data that it covers.
Requires that one picks the correct dem file that matches the flight.

Click on the AutoView button, select an IGC track log, and the code determines where about this track log is.
It then cuts out of the DEM data the area that you are flying over. Then displays it as a site called Auto or whatever you define it in the Config options.