[GRASS5] New USGS DEM data format
Roger S. Miller
rgrmill at rt66.com
Wed Aug 1 22:55:11 EDT 2001
Rich Shepard wrote:
> On Wed, 1 Aug 2001, Roger S. Miller wrote:
> > Where did your information come from? They haven't done that yet, and I
> > don't see any evidence on their site that they intend to ever do that.
> I just forwarded Bill's message to the GRASS-5 list.
Thanks, I read it. I guess they made the transition to the
GeoCommunities servers pretty seamlessly. Or maybe the step from
webglis to earthexplorer *is* the shift to GeoCommunities, in which case
it isn't working very well.
> > They keep threatening to take webglis down and force all traffic through
> > earthexplorer, which would be unfortunate. I have never gotten
> > EarthExplorer to work right.
> Me, neither. I wrote to them and explained that it wouldn't work with
> Navigator-4.77, mozilla-0.9.1 or opera-5.0 (identifying itself as MSIE5.0).
> Still broken.
I've written them a couple times about it. Most recently today. They
have been announcing that shift for a long time now and just moving the
date back. Hopefully they will get it right before they force the
shift. So far, earthexplorer looks like a massive mistake.
> > I would be surprised if they added any accuracy by changing the file
> > format. In fact, I would be surprise if they changed the file format on
> > anything they already released in an older format. They put out new
> > digital map data all the time (especially in the 7.5 minute series).
> > Perhaps they are using a new format for the newly released data?
> Read the article. They _did_ change the data and they modified SDTS
> format. Strangely enough, only ARC/GIS-8 supports that format. And the GS is
> a complete ESRI shop (which is how ESRI got to be as big as they are).
Actually, as I read the article it appears that the format change
they're talking about isn't a change *in* the SDTS format, but the (now
old news) change *to* the SDTS format. The article is talking about the
differences between the old DEM format (which I think was mostly phased
out more than a year ago) and the SDTS format.
They underestimate the number of applications that read SDTS. The SDTS
standard was published quite a while ago. Surfer started importing SDTS
files in version 6, which was released in 1997. I could have sworn that
GRASS used to have at least a v.in.sdts, but now I can't find it. I
must be going crazy. Some programs were available from government
agencies for reading SDTS files almost as soon as the standard was
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