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Re: [TowerTalk] Microdem Issues

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Microdem Issues
From: Pete Smith N4ZR <n4zr@contesting.com>
Date: Fri, 07 Feb 2014 08:14:24 -0500
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It's not on the PVRC site. The archive is on the WWROF site <http://wwrof.org/category/webinar-archive/> - they picked up the funding of webinars from PVRC last year.
WRT the process of obtaining DEM data for use in MicroDEM > HFTA 
elevation file generation, USGS confirmed to me directly that they have 
discontinued the GeoTIFF data format that contained the needed .GIF 
file, as a cost-cutting measure. For the moment, at least,you can still 
get un-updated GeoTIFF from <http://www.mrlc.gov/viewerjs/>. The default 
format is ArcGrid, just as it used to be direct from USGS, but you can 
modify your data request to change to GeoTIFF
73, Pete N4ZR
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On 2/6/2014 12:27 PM, Jim Brown wrote:
On 2/6/2014 8:36 AM, Tom Hellem wrote:
Does anybody on the list know what I can do to get past a
couple error messages I receive when trying to open a DEM
file in Microdem? The error messages are "Need 7z for GZ extraction"
and "xxx is Not an acceptable DEM". I went to the 7z website and
downloaded & installed the 7Z extraction utility, but that didn't help.
Any input would really be appreciated. Been trying to get Microdem
working for months without success.
You're doing this for HFTA, right?  Last I heard about this, the 
formats of the Microdem data and/or its extraction process have 
changed over the years that HFTA has been using them. HFTA author, 
Dean Straw, has done some talks about using HFTA, including the 
Microdem process, most recently in a WebEx for PVRC. In addition, ARRL 
has done their best to keep up with the changes, and I remember Dean 
pointing us to stuff on the ARRL website.  I think you can find a 
recording of the WebEx on the PVRC website.
73, Jim K9YC
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