Display elevation data using OpenGL
$ make
./bin/terrain-viewer [ FILE ]
FILE
Formatted elevation file. Reads from standard input if no file is given.
First number in file should be the number of columns followed by the
number of rows. The third number is the resolution of the elevation
data. The rest of the file should contain a minimum of (ncols x nrows)
elevation points.
$ ./bin/terrain-viewer examples/alleghany-1024x1024.asc