I am working on a weather application and I've been looking over the
internet for topographic image of the entire US but to no avail. I am
posting here to see if I can get some help from the GIF experts out
there to get what I want...
* Topographic image of the entire United States
* Format: DEM or BIL
* Filesize should not exceed 200 MB (the smaller the better)
The closest I have found:
This map is 80% of the way there, however, it is not high enough
resolution at "30 arcsec". I am assuming 15 or 10 "arcsec" would be
exactly what I need.
I know there are many websites which have extremely high resolution
data, but we can only download one state at a time. I want the entire
United States or at least the mainland USA in one file.
Any recommendation will be much appreciated.
> The closest I have found:
> This map is 80% of the way there, however, it is not high enough
> resolution at "30 arcsec". I am assuming 15 or 10 "arcsec" would be
> exactly what I need.
That page says their image was "derived from National Geophysical Data
Center (NGDC) DTM [30 arcsec]" which makes it sound quite possible the
source data was higher resolution.
I see the source data seem to be here (in various forms):
and the file sizes seem bigger, so perhaps it is higher resolution.
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