I've got free Digital Elevation Data for the Earth
(for heightfields etc) in both 8bit and 16 bit formats
ranging from:
- 360x180 degrees (1 datapoint/square degree) to
- 4320x2160 ( 12*12 == 144 datapoints/square degree)
http://www.cuug.ab.ca/~fortuned/dew.html
Doug Fortune
Calgary