Hi,
we have a really good experience using external uBlox USB GPS. It has
the nice feature of being able to receive NTRIP corrections which adds
significantly to accuracy (+- 20cm). Either we connect it directly to
laptop running Qgis or it's connected to RaspberryPI running gpsd and
ntrip clients, while Qgis runs on android tablet and receives gps data
via wireless. This way we can hold the external antenna high enough to
get an unblocked view at most times...
Tomas Vrana <[email protected]>
-------------------------------------
Ceskomoravska telekomunikacni s.r.o.
http://www.cemotel.cz/
phone: +420 530 505 501
Dne 16.10.2013 10:26, Zoltan Szecsei napsal(a):
Hi Conrad,
Nice to get some real field experience coming through in your reply.
Franson GPSgate is what I had stumbled upon too, but then my wife
stole my laptop to go up country to run a 3 day course, so it will be
Friday before I can resume my experimentation.
I will probably end up connecting an oldish Garmin 60CSx to the
laptop, but was wanting to set up the system for trials, using the S3.
Next issue is to find Camera software that also records (approx)
compass bearing in the image.......
Regards and thanks for your input.
Zoltan
On 2013/10/15 22:59, conradh wrote:
Hi Zoltan,
Have you tried using Franson GPS gate. I used it a couple of years
back to
interface between a "Qstarz" GPS data logger which transmistted a
NMEA live
stream via blue tooth and QGIS on a laptop. I came to the conclusion
that
sometimes the QGIS buffer gets full so using GPS gate buffers the
live NMEA
stream and generlly keeps things orderly.
I am not a fan of using your phone GPS for the following reasons a)
battery
life b) you always need to use your phone for something else and c)
if you
use a stand alone gps transmitter you can tape it to the front dash
in the
car/ put it under the sun visor etc so that you have a clear gps signal
through the front windscreen of the car. The application was ground
truthing
power line routes around Ankor Watt in Cambodia to ensure the line
routes
were outside the nominated temple areas and worked quite well.
However the
learnings were that it is hard to use a laptop in a car on a bumpy
road and
you should always have a backup gps logger. I also taped a mobile
phone USB
dongle to the front windscreen of the car so I could download GE as a
background map in real time but this did not work so well, too many
wires
and not a good phone signal in some areas. If I was doing it again I
would
have the case of a GPS transponder taped to the front dash so I could
easily
remove the transponder as needed (they get hot in the sun when
parked) and
use some sort of tablet, with good battery life, which would be
easier to
use in a moving vehicle. In a similar manner if you are data logging
while
wandering about you can put the transponder in your hat band as they are
quite small and you will be more likely to recieve a good gps signal
(clear
view of the sky)
--
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