Hi Nishant,
Am 05.04.2014, 10:20 Uhr, schrieb Nishant Alag <[email protected]>:
i used srtm_52_06 to obtain aspect and slope. Aspect in one sense seems
fine but slope is not undestandable in terms of figures, i chose slope in
percent but it gives me figures ranging from 0 to 1.15778e+07. How to
convert it into percentage or what would be the stepwise process i.e.
using srtm as a input file.
The SRTM data is in WGS84 EPSG:4326, right? That means that x,y are in
degrees and z is in meters. Calculating slope will give strange results if
you don't use the correct z factor settings:
If everything is in meters, use z factor 1.0 (default).
If x/y is in degree and z in meters, use z factor 111120.
If x/y degree and z is feet, use z factor 370400.
Best wishes,
Anita
--
anitagraser.com
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