[TowerTalk] HFTA Type Data Outside of North America?

[Pete Smith]

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 reversebeacon.blogspot.com


On 4/11/2010 4:05 PM, Joe Subich, W4TV wrote:
> Billy,
>
> 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.
>
> 73,
>
>     ... Joe, W4TV
>
>
>
>    
>> -----Original Message-----
>> From: towertalk-bounces at contesting.com
>> [mailto:towertalk-bounces at contesting.com] On Behalf Of Billy Cox
>> Sent: Sunday, April 11, 2010 3:30 PM
>> To: towertalk at contesting.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?
>>
>> Thanks!
>>
>> 73 de Billy, AA4NU _______________________________________________
>>
>>      
>
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