There's some question in my mind about how well
these data will work with HFTA. The horizontal
resolution of the data appears to be 3
arc-seconds, which is 1/1200th of a degree of
latitude and longitude, or about 90 meters (295
feet). I don't know what effect this relatively
low resolution, relative to HF wavelengths, may have on HFTA. Dean???
73, Pete N4ZR
At 02:13 PM 6/26/2009, Jon Kåre Hellan wrote:
>The Shuttle Radar Topography Mission made a digital elevation model that
>covers most of the world between 60 N and 60 S. It can be found at
>http://srtm.csi.cgiar.org/SELECTION/inputCoord.asp. I don't know if
>you'll get the file format HFTA expects, though.
>
>For parts of the world not covered by SRTM, e.g. most of Scandinavia,
>the model at http://www.viewfinderpanoramas.org/dem3.html can be used.
>
>Regards
>
>LA4RT Jon, Trondheim, Norway
>
>Jim Brown wrote:
> > On Fri, 26 Jun 2009 09:56:14 -0700, Jim Brown wrote:
> >
> >> Luckily lithuanian landscape is quite flat so real terrain data would
> >> not be far from flat data. Finally I think GPS also could help me or my
> >> friends to find real data.
> >
> > That certainly makes it easier. I just thought of another way to get
> > this data. The program GOOGLE EARTH uses a world wide database of
> > satellite photographic and terrain data. The accuracy and level of
> > detail of this data varies widely from one location to another, even
> > within the same country. Once you find your location, you can use the
> > "RULER" function to draw radials and measure their length. You can also
> > turn the viewpoint so that you are perpendicular to that line (that is,
> > you are looking at the line sideways, and from a low angle) and you will
> > see how the terrain goes up and down. And as you move your cursor, there
> > is a window at the bottom of the screen that gives the elevation of the
> > cursor.
> >
> > Google Earth is FREE, and is both VERY useful and very interesting. At
> > my QTH, you can see my house and my ham shack, even the skylight windows
> > on the roof.
> >
> > 73,
> >
> > Jim K9YC
> >
> >
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