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Unable to read DEM file with GTOPO30s

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HRmatlab
HRmatlab 2017-8-17
编辑： Walter Roberson 2017-9-5
i am trying to read GTOPO30 data I downloaded from USGS https://earthexplorer.usgs.gov/.
I selected a region in So. California with latlim [34 36], lonlim [-120 -118]. When I try reading the DEM file I get an error:
The GTOPO30 directory, 'C:\Documents\MATLAB\gt30w140n40_dem/', does not contain data for the specified latitude longitude limits.
But I am pretty sure I have the correct dem tile with the correct latitude longitude limits.
In fact gtopo30s([34 36],[-120 -118]) returns the correct tile name w140n40. Any help would be greatly appreciated.
  2 个评论
Walter Roberson
Walter Roberson 2017-8-17
How are you doing the reading?
Unfortunately that file requires a login to download so I cannot test that one myself.
HRmatlab
HRmatlab 2017-9-5
编辑：Walter Roberson 2017-9-5
Apparently the files I downloaded from USGS did not contain the data MATLAB was expecting. Downloading the same area from an alternative USGS site https://dds.cr.usgs.gov/srtm/version2_1/SRTM30/ resolved the issue.

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Chad Greene
Chad Greene 2017-9-1
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