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The following message was distributed to the GISList discussion group by TC Herman, Executive Vice President, The GeoCommunity on Friday, July 27, 2001. The message is in response to a number of requests for information regarding changes in the formatting of DEM data developed by the USGS.
GISList - Outlined below are some of the known differences/notes regarding pre and post jan2001SDTS DEMs according to the USGS:

1)The Profile Identification PRID subfield in the xxxxIDEN.DDF:
pre jan2001 have PRID of "SDTS RASTER PROFILE"
post jan2001 have PRID of "SRPE: RASTER PROFILE and EXTENSIONS"

2)Data type for CEL0 values of SDTS DEMs:
pre jan2001 z-units were in feet or meters .....data type BI16.
post jan2001 z-units can be feet, meters or decimal meters.... data type can be BI16 (feet or meters) or BFP32 (for decimal meter)

B. Only the most recent Sol Katz sdts2dem/sdtsedem .exe's will work on the SDTS decimal meter DEMs.

C. ArcView 3.2 and ERDAS Imagine 8.4 do not recognize PRID of SRPE: RASTER PROFILE and EXTENSIONS as a valid SDTS Profile. There is no problem with ArcInfo8 and ArcView8...ArcToolbox works OK.
The ArcView3.2/ERDAS workaround requires editing the xxxxIDEN.DDF with Notepad.

D. DLGv32 does not display SDTS decimal meter DEMs correctly...color stretch/z values goofed up.

E. Software vendors that support the new SDTS DEMs with z-units of feet, meters, and decimal meters:
ArcInfo 8, ArcView 8 via ArcToolbox.
ArcView3.2 (requires editing of xxxxIDEN.DDF)
ERDAS Imagine 8.4 (requires editing of xxxxIDEN.DDF )
FME
3DEM
MicroDEM



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If you develop DEM related products, scripts, extensions, or translators and would like to make them available to the public, please send e-mail to editor@geocomm.com



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