I'm playing around with USGS DEM files and get the following error whenever I try to open them in Maptitude. Anyone have any insight or suggestion of what I might be doing wrong?

Error recieved when attempting to open a STD file:

"! Sorry an error occurred while scanning C:\ccdata_04\Maricopa\DLGSDEM\3676IDEN.DDF: Invalid SDTS DQHL module. Click OK to continue.
Reference info: import, 3926,1."

I'm taking a USGS STD TAR file "3703847.DEM.SDTS.TAR.GZ" and uncompressing it and getting series of *.DDF files and then using Maptitude to open the *IDEN.DDF, which then gives me the error above.

Thanks in advance,

Viktor Keenan de la Hoz - Senior GIS Technician
City of Phoenix - Street Transportation Department
Design and Construction Management Division


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