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<a class="moz-txt-link-abbreviated" href="mailto:vk4tec@tech-software.net">vk4tec@tech-software.net</a> wrote:
<blockquote cite="midLGEKIKIAKJPNFGILGJBBMEMBCFAA.vk4tec@tech-software.net" type="cite">
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<div><span class="496041822-25122005"><font face="Arial" size="2">Gudday</font></span></div>
<div><span class="496041822-25122005"></span> </div>
<div><span class="496041822-25122005"><font face="Arial" size="2">Working
on a PERL to MySQL perl script for an Australian Experimantal Data Store</font></span></div>
<div><span class="496041822-25122005"></span> </div>
<div><span class="496041822-25122005"><font face="Arial" size="2">I
have got most of it working, in that I have callsigns and positions.</font></span></div>
<div><span class="496041822-25122005"></span> </div>
<div><span class="496041822-25122005"><font face="Arial" size="2">I
am getting the impression different systems use different co-ordinate
formats.</font></span></div>
<div><span class="496041822-25122005"></span> </div>
<div><span class="496041822-25122005"><font face="Arial" size="2">I
am assuming from what I have seen that the degrees always stays the
same.</font></span></div>
<div><span class="496041822-25122005"></span> </div>
<div><span class="496041822-25122005"><font face="Arial" size="2">It
is the bit after the decimal point that changes.</font></span></div>
<div><span class="496041822-25122005"></span> </div>
<div><span class="496041822-25122005"><font face="Arial" size="2">I
seem to have ended up with positions from the APRS stream in the format
of deg minutes and seconds ???</font></span></div>
<div><span class="496041822-25122005"></span> </div>
<div><span class="496041822-25122005"><font face="Arial" size="2">Wondering
if there is some perl code floating around that converts deg min
seconds to dec degrees ?</font></span></div>
<div><span class="496041822-25122005"></span> </div>
<div><span class="496041822-25122005"><font face="Arial" size="2">My
main use for this is google earth. Which seems to want decimal degrees.</font></span></div>
<div><span class="496041822-25122005"></span> </div>
<div><span class="496041822-25122005"></span> </div>
<div><span class="496041822-25122005"></span> <br>
</div>
</blockquote>
<br>
<br>
The default APRS format is the native format for NMEA GPS data --
Degrees, Minutes and decimal fractions of minutes (not degrees, minutes
and seconds and not degrees and decimal degrees). If DD-MM-SS data is
appearing on the APRS Internet system, someone has incorrectly
configured a program or hardware device. <br>
<br>
<br>
Note that DD MM.mm allows a slightly higher resolution than the classic
degs-mins-secs format for the same number of ASCII digits. (Two digits
used for seconds resolves 1/60ths of a minute while two digits used for
decimal minutes resolves 1/100ths of a minute.) <br>
<br>
<br>
The position relative to the equator and prime meridian should be
delimited by E/W and N/S rather than +/- degrees. Thus a normal
APRS/NMEA posit would normally be transmitted or displayed as:<br>
39 09.84 N<br>
118 07.02 W (My QTH in Pasadena, California)<br>
<br>
Some programs, notably UIview, have the user input this into the
program setup somewhat confusingly as:<br>
39.09.84N <br>
118.07.02W<br>
<br>
with TWO periods in the string but it is still DD MM.mm format
-- NOT DD.dddddd all-decimal format or DD MM SS
degs-minutes-seconds formats. <br>
<br>
I am also painfully aware of the<span style="font-size: 12pt; font-family: "Times New Roman";"></span>
nuisance of converting DD MM.mm to all-decimal DD.dddddd format
for several mapping applications I use (notably MapPoint and MapInfo)
but the math is trivial. Divide the MM.mm part by 60, and add the
results (which will always be a decimal value less than 1.00) to the
degrees part. <br>
<br>
<br>
<br>
<br>
<br>
<br>
Stephen H. Smith wa8lmf (at) aol.com <br>
EchoLink Node: 14400 [Think bottom of the 2M band]<br>
Home Page: <a class="moz-txt-link-freetext" href="http://wa8lmf.com">http://wa8lmf.com</a><br>
<br>
"APRS 101" Explanation of APRS Path Selection & Digipeating <br>
<a class="moz-txt-link-freetext" href="http://webs.lanset.com/wa8lmf/DigiPaths">http://webs.lanset.com/wa8lmf/DigiPaths</a> <br>
<br>
Updated APRS Symbol Chart <br>
<a class="moz-txt-link-freetext" href="http://webs.lanset.com/wa8lmf/miscinfo/APRS_Symbol_Chart.pdf">http://webs.lanset.com/wa8lmf/miscinfo/APRS_Symbol_Chart.pdf</a> <br>
<br>
<br>
New/Updated "Rev G" APRS <a class="moz-txt-link-freetext" href="http://webs.lanset.com/wa8lmf/aprs">http://webs.lanset.com/wa8lmf/aprs</a><br>
Symbols Set for UI-View, <br>
UIpoint and APRSplus:<br>
<br>
<br>
<br>
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