[TowerTalk] SRTM Fill Data

[Paul Plants]

Paul, W3CRA was not at the top of the hill but slightly over the south side of the hill might the problem you are finding. The tower is still up but the antenna broken with only one element in place. This location is about 10 miles from me next time there I will try to get pic.
Paul
W3PLP

Sent from my iPad 3

> On Jun 21, 2014, at 10:48 PM, "Paul Christensen" <w9ac at arrl.net> wrote:
> 
> Been trying to model the legendary W3CRA site using HFTA.   I downloaded the SRTM 1 arc-second data in a .TIF format from the NASA website.  All is working well except that a few north bearings from the site appear to have been data-shadowed during the year 2000 space shuttle capture.   This shows as a dead terrain zone between 900 ft to 2200 ft on the hill just north of the site.   That's a huge problem since HFTA heavily depends on the mid-field terrain data.  In researching this effect, apparently quite a few SRTM tiles require "fill data" from an alternate source.
> 
> I figured out how to merge .TIF data image tiles, but does anyone know how to add fill data back into a .TIF file and exactly what 1 arc-second source to use?  Tnx!
> 
> Paul, W9AC
> 
> 
> 
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