The USGS website dropped the 1 arc second option from their menu after
the last revision of the HFTA instructions, so the answer won't be in
there. If you select the 1/3 arc second option, you will see that the
system gives you 1 arc second data (not 1/3).
Jerry, K4SAV
Ian White GM3SEK wrote:
>Steve wrote:
>
>
>>I haven't used HFTA for a couple of years and the web site from which
>>topographic data is downloaded has changed somewhat.
>>
>>The Elevation ==> 1' NED option mentioned in the HFTA instructions is no
>>longer available. There are, however, three other NED options in the
>>Elevation drop down list: NED shaded relief (1/9 arc second); NED shaded
>>relief (1/3 arc second); and NED shaded relief (2 arc second).
>>
>>Will any of the three newer NED elevation choices meet HFTA's needs?
>>Which one?
>>
>>I'm using the version of HFTA that came with the 20th edition of the
>>ARRL Antenna Book.
>>
>>
>
>Have you downloaded the latest HFTA instructions from the ARRL site?
>http://www.arrl.org/notes/9876/HFTA.pdf (updated Sep 10th, 2007)
>
>
>
>
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