I have a particular .asc file, with elevation data in it.
I am wondering if somebody knows, what is the unit for the "cellsize" variable in the header of the .asc file?
Here is how the header looks like:
ncols 236
nrows 121
xllcorner 2.022083333
yllcorner 41.32875
cellsize 0.000833333
NODATA_value -32768
What unit is the "0.000833333"?
A meter, or an arc?
I found a couple of pages on internet which explain the content of the .asc files headers, but still none explain what is the length unit of the "cellsize"?
Does anyone know?
Best Answer
Almost certainly not meters. 0.00083m is tiny, less than 1mm.
At the equator, 0.00083 degrees is around 90m, which sounds about right for a lot of the more usual DEMs (such as SRTM, GTOPO). This varies according to latitude.
So it's probably a 3 arc-second DEM (like the original SRTM). You should probably check with your source for what projection they're using too