Re: [TowerTalk] SRTM Fill Data

[Michael Tope <W4EF@ca.rr.com>]

Paul,

This document has a pretty good explanation of how the non-SRTM data was 
blended to fill in voids:
https://lpdaac.usgs.gov/sites/default/files/public/measures/docs/NASA_SRTM_V3.pdf

Looks like they used data from the ASTER mission (GDEM2) along with USGS 
NED data in the US (I think this is the 7.5 arcsec data you get on USGS 
quad maps) and GMTED2010 data outside the US.
73, Mike W4EF................


On 6/21/2014 8:30 PM, Paul Christensen wrote:
> Just discovered a data-filled version of the SRTM data:
>
> http://earthexplorer.usgs.gov/
>
> After the coordinates are entered into the "Search Criteria" tab, go 
> to the "Data Set" tab and instead of selecting SRTM, select "SRTM Void 
> Filled." Works well now on the northern shadowed side of the hill but 
> not sure how the fill data was collected nor its overall accuracy.   
> Anyone know?
> Paul, W9AC
>
> -----Original Message----- From: Paul Christensen
> Sent: Saturday, June 21, 2014 10:48 PM
> To: towertalk@contesting.com
> Subject: [TowerTalk] SRTM Fill Data
>
> 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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