Re: Fw: [GRASSLIST:8574] [tom.farr JPL.NASA.GOV: SRTM V2 released]

Hamish attached:

> NASA has released version 2 of the Shuttle Radar Topography Mission 
> digital topographic data (also known as the "finished" version). 
> Version 2 is the result of a substantial editing effort by the 
> National Geospatial Intelligence Agency and exhibits well-defined 
> water bodies and coastlines and the absence of spikes and wells 
> (single pixel errors), although some areas of missing data ('voids') 
> are still present. The Version 2 directory also contains the vector 
> coastline mask derived by NGA during the editing, called the SRTM 
> Water Body Data (SWBD), in ESRI Shapefile format.
>
> The data may be obtained by anonymous ftp to:  e0srp01u.ecs.nasa.gov 
> and moving to the directory srtm where both version 1 and version 2 
> directories may be found. Please read the appropriate documentation, 
> also found in the directories.


Thanks, I am starting to fetch the data now ... but it will probably 
take a few days to get it all down here.

The water body data looks interesting.  Is there any word/comments on 
how well this handles lake and river data?  Has anyone commented on how 
the SWBD data might compare to VMAP0?  Having good water body, river, 
and stream data that is calibrated to the underlying terrain data set 
would be a huge gift to the world.  But if this is all generated from 
30/90 meter elevation posts, I suspect that vmap0 might have finer 
grained resolution?

I'll try to keep the download and processing of this data moving on my 
end as much as possible.  My Grandmother became ill about 3 weeks ago 
and passed away yesterday evening so I and my family have been devoting 
a lot of time to that in the past couple weeks and we will be 
concentrating on funeral and family stuff much of this week too.  So my 
response time will be even less deterministic than usual for the next 
week.  (Oh and I'm going out of town for a training class the following 
week and will be largely offline ...)  I guess life never stops to wait 
for me to catch up. :-(

Thanks,

Curt.

-- 
Curtis Olson        http://www.flightgear.org/~curt
HumanFIRST Program  http://www.humanfirst.umn.edu/
FlightGear Project  http://www.flightgear.org
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