Hello,
paul ferro claviota:
Hi Pierre or anyone else that has success with connecting to a GPS
with QGIS through the GPS plugin.
I Haven't tried this since a long time: gpsbabel works so well that I
don't really need this extension. But I'll try it right now, and I'll
tell you about it shortly.
I am trying to connect a Garmin GPS that has a com to usb converter
cable.
I think I have such a cable somewhere. I don't need it any more, since
my garmin device has a USB port.
Other apps. read my GPS from COM3, and work just fine.
I just installed QGIS 1.4, and GPS babel is installed, and I have set
the PATH under environmental variables so that QGIS will see
gpsbabel. But whenever I go to download from my GPS,
Looks good, so far.
I either get the message that 'GPS Babel would not start',
Is gpsbabel in the search path of your system?
<troll>Do you use a modern operating system, with a Unix-type
architecture, or one of these old-fashioned things which used to be
sold, especially during the last century? I think it was called
Crimosoft windows, or something similar. (sorry, I couldn't help...)
These old, inefficient, etc. systems are really troublesome, as far as
multiple search paths are concerned. Apparently, this seems to be your
case, since you have to set PATH variable.</troll> Maybe there is
another variable required?
or 'this layer could not be added to the map'
Does this message appear _after_ the data was downloaded?
What is the code that you are using for your GPS unit under devices in
the GPS Device Editor?
The default for Garmin under the waypoint command is %gpsbabel -w -i
garmin -o gpx "%in" "%out"
I've also tried %babel -w -i garmin -f COM: -o gpx -F gps.gpx but
have not had luck.
This is the command line I use:
gpsbabel -t -w -i garmin -o gpx -f /dev/ttyUSB0 -F tmp.gpx
It is included in a complete script that I use regularly.
Here is the script I use to dump my gps: it creates some backups, does
some stuff, and eventually adds data to my main gps log file
(gps_log.gpx). It is a bash script. I'm afraid the comments are in
French, but it is quite understandable, I believe. There is still a bit
of paranoid backups, you may notice; I'll remove them, one day:
echo "Dompage de la montre garmin forerunner dans ~/gps/gps_log.gpx"
cd ~/gps #_domps_montre_garmin_forerunner
echo "Sauvegarde du gps/gps_log.gpx précédent dans .okz"
cd .okz
#tiré de mkdiraujourdhui
i=`date +%Y_%m_%d`
mkdir $i && ls -trlh | tail -1
cd ..
cp gps_log.gpx .okz/$(ls .okz/ -trp | grep \/ | tail -1)
#allons chercher les données du gps
echo "Dompage des données du gps, préalablement convenablement raccordé"
echo "..."
gpsbabel -t -w -i garmin -o gpx -f /dev/ttyUSB0 -F tmp.gpx
#pour enlever les:
# <cmt>^D#</cmt>
# <desc>^D#</desc>
# disgrâcieux qui embêtent qgis:
echo "nettoyage..."
grep -v \# < tmp.gpx > tmp2.gpx
#filtrons la sortie, manière de nettoyer un peu:
#d'abord, on assemble les traces en une trace
echo "rassemblage des traces en une seule..."
gpsbabel -t -i gpx -f tmp2.gpx -x track,merge -o gpx -F tmp3.gpx
#puis on redivise tout ça, en fonction du temps. On sépare les
tracés quand il y a plus d'une demi-heure entre chaque point (GPS
éteint ou sans couverture sat: ça évite les longs tronçons droits
disgrâcieux quand on paume les satellites), et on met un titre
explicite au tracé, généré à partir de la date&heure
echo "puis redivision de la trace en fonction des arrêts de plus de
30 minutes..."
gpsbabel -t -i gpx -f tmp3.gpx -x
track,pack,split=30m,title="%Y_%m_%d %r" -o gpx -F tmp4.gpx
#gpsbabel -t -w -i garmin -o gpx -f domp_gps_forerunner_log.gpx -i
gpx -f tmp2.gpx -F tmp3.gpx
#marche plus, le 19/10/2008
#puis on rassemble avec le fichier principal où on logge tout, en
excluant les duplicates:
echo "puis on rassemble avec le fichier principal où on logge tout,
en excluant les duplicates..."
gpsbabel -t -w -i gpx -f gps_log.gpx -i gpx -f tmp4.gpx -x
duplicate,location -o gpx -F tmp5.gpx
#on renomme le dernier fichier temporaire avec la date courante:
echo "on renomme le dernier fichier temporaire avec la date courante..."
i=domp_gps_`date +"%F-%Hh%M"`.gpx
mv tmp4.gpx $i
#quelques sauvegardes, un peu parano, mais tout ça est en cours
d'écriture; on supprimera quand on sera sûr de soi:
echo "quelques sauvegardes de plus..."
cp gps_log_dernier.gpx gps_log_avant_dernier.gpx
cp gps_log.gpx gps_log_dernier.gpx
#Et finalement, on renomme le dernier vers LE fichier contenant tous
les tracés:
echo "Finalement, on renomme le dernier vers LE fichier contenant
tous les tracés"
mv tmp5.gpx gps_log.gpx
#ménage
echo "ménage"
rm tmp.gpx
rm tmp2.gpx
rm tmp3.gpx
#mv domp_gps_forerunner_log_dernier.gpx
domp_gps_forerunner_log_avdernier.gpx
#mv domp_gps_forerunner_log.gpx domp_gps_forerunner_log_dernier.gpx
#mv tmp3.gpx domp_gps_forerunner_log.gpx
#rm dernier_domp_gps_forerunner.gpx
#ln -s tmp_domp_gps_forerunner_`date +"%F-%Hh%M"`_pt_trk.gpx
dernier_domp_gps_forerunner.gpx
#regardons un peu le résultat: on lance viking
echo "regardons un peu le résultat: on lance viking"
viking gps_log.gpx $i
#puis on revient où on était au départ
cd -
For some reason, strange characters appear in the .gpx from gpsbabel.
And qgis or viking don't like them. This is the reason why I do the
grep, to remove the troublesome lines:
grep -v \# < tmp.gpx > tmp2.gpx
I should have issued a bug report, on this one, I think...
A+
Pierre
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