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[aprssig] Balloon DFing on APRS

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Thu Mar 8 03:14:41 UTC 2012


The general idea of quality was to display a wedge in the specified 
direction out to the range.  You can possibly accomplish the same thing 
with a line and label, but if you take the wedges from different 
observations and overlap them with a transparency, the overlapping 
region describes the most likely location of the transmitter.  In my 
case, I go +/- one half of a wedge angle based on the quality of the 
measure.

Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32

On 3/7/2012 9:34 PM, Gregory A. Carter wrote:
> Correct me if I have read the spec wrong on DF but it seems the best
> way to implement this on a map is perhaps a compass with a line drawn
> in the direction given by BRG and ending after R (in NRQ) miles in
> that direction.  Quality and number (hits) are best given textually in
> an info window or perhaps in the case of Quality displayed with
> differing colored lines for differing qualities.
>
> If this sounds correct I'll try and get it up on OpenAPRS in the next
> couple of days.
>
> Greg
>
> On Mon, Mar 5, 2012 at 8:28 AM, Lynn W. Deffenbaugh (Mr)
> <ldeffenb at homeside.to>  wrote:
>> I believe Bob is planning to use the original directional DF, not the
>> omni-DFS for his balloon tracking.  Does OpenAPRS parse the original as
>> well?  If so, I'd like to run a few test objects to see what they look like
>> prior to the actual reports coming in.
>>
>>
>> Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32
>>
>> On 3/5/2012 11:24 AM, Gregory A. Carter wrote:
>>> I reviewed the code, DFS is available in the database but not rendered
>>> on the frontend.  I can probably fix that in a few days if it would
>>> help.
>>>
>>> Greg
>>>
>>> On Sun, Mar 4, 2012 at 9:30 PM, Gregory Carter<omnidynmc at gmail.com>
>>>   wrote:
>>>> OpenAPRS does actually parse DFS and I believe will render.  I will have
>>>> to test it out, it has been a while since I wrote that code.
>>>>
>>>> Greg
>>>>
>>>> Sent from my iPhone
>>>>
>>>> On Mar 2, 2012, at 5:22 AM, "Bob Bruninga"<bruninga at usna.edu>    wrote:
>>>>
>>>>>> aprs.fi currently does not support DF in any way.
>>>>> OOps.  Does anyone else know any other on-line sites that do?
>>>>> Thanks
>>>>>
>>>>> Bob, Wb4APR
>>>>>
>>>>>
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>>>
>>
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>




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