[Gdal-dev] GTOPO30 data read errors

[Clay, Bruce]

I Think I found the error of my ways (at least on this problem).  I did
not have a .hdr file in the same directory as the .dem file.  Are there
any other files I need in the directory?  When I unzip the dem.tar.gz
files there are several files extracted. Two of them are fair sized, the
dem and a .src file.  Of course we need the DEM but do we need the SRC
file?  Has any work been done on reading DEMs from compressed file to
save disk space?

Bruce
bclay at ball.com


-----Original Message-----
From: Clay, Bruce 
Sent: Tuesday, February 17, 2004 1:38 PM
To: gdal-dev at remotesensing.org
Subject: [Gdal-dev] GTOPO30 data read errors


I have downloaded the GTOPO30 data from edcftp cr usgs gov and find that
GDAL can not read most of it.  Many of the files appear to be mostly a
repeating sequence of D8 F1 D8 F1...

Question 1. Is the expected data sequence?

Question 2. Is there something I need to do with GDAL to get it to read
these files?

I have traced into the GDAL code into usgsdebdataset.cpp and it is
rejecting the files because it dose not find the character sequence it
is expecting.

Thanks for your help.

Bruce Clay
bclay at ball.com 
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