The USGS seamless data server used to provide access to these data, but
I just verified that it now offers only US data. The EROS Data Center
is supposed to offer world-wide data, but at the moment their web site
is broken. Meanwhile it appears that http://srtm.csi.cgiar.org/ has
worldwide 90-meter data available for download. Note, though, that this
means that the data points are approximately 300 feet apart (in the
horizontal plane), which is a considerable step down from the TM
30-meter data originally used. That could affect the accuracy of the
HFTA modeling, depending on your terrain. It *might* be better to get a
topo map and go through the laborious pencil and straight-edge
technique, unless you can get TM data.
73, Pete N4ZR
The World Contest Station Database, updated daily at www.conteststations.com
The Reverse Beacon Network at http://reversebeacon.net, blog at
On 4/11/2010 4:05 PM, Joe Subich, W4TV wrote:
> Dean Straw recommended the SRTM (Space Shuttle Topography Mission)
> 90 meter data. He has a draft of the HFTA operating directions
> that reference an updated microDEM that will work with the SRTM
> data. Here is the relevant paragraph:
> > Dr Peter Guth, author of MicroDEM, has fixed versions of MicroDEM
> > after June 6, 2009, to work correctly with SRTM input. You will
> > have to go to the MicroDEM website to download the complete basic
> > package, which is about 55 MB in size. After you have installed
> > the basic version, you must then download the latest executable
> > Microdem.exe, following instructions also on the site:
> > http://www.usna.edu/Users/oceano/pguth/website/microdemdown.htm.
> Appendix A in Dean's latest draft operating instructions provides
> detail on generating terrain profiles using the STRM data with the
> updated version of microDEM.
> ... Joe, W4TV
>> -----Original Message-----
>> From: email@example.com
>> [mailto:firstname.lastname@example.org] On Behalf Of Billy Cox
>> Sent: Sunday, April 11, 2010 3:30 PM
>> To: email@example.com
>> Subject: [TowerTalk] HFTA Type Data Outside of North America?
>> For using HFTA, the required data seems reasonably easy to access
>> within North America... but what about outside of North America?
>> Any suggestions for our fellow hams in those areas as to
>> websites or other free or low charge sites to consider?
>> 73 de Billy, AA4NU _______________________________________________
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