[TowerTalk] Microdem Issues

[Pete Smith N4ZR]

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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