[GRASS5] GPS connectivity

Andreas Lange Andreas.Lange at Rhein-Main.de
Wed May 24 17:35:05 EDT 2000

Rich Shepard wrote:
>   The above URL gets me only to www.tripod.de.

Hi Rich, hi developers,

sorry, the URL is wrong, look at:

(Lycos/Tripod only allows one hierarchy of subdirectorys, sorry for the
pop-up window)

Sorry for any inconvienience.

I don not plan to deal with differential correction, i think that users
that can afford and need dgps accuracy should go with commercial
software. They should contact their vendor for unix/linux software. If
the receiver uses NMEA-sentences or the binary format is documented
postprocessing should be possible in theory on linux/unix. But this
exceeds my resources and time. 

There are already many libraries/programs for up- and downloading data
to gps receivers, _but_ they all have several drawbacks: They are
model-specific (mostly garmin), as the protocols are vendor specific. 

For us european users additional problems arise: 
I need map datum conversion as the german topo maps are in potsdam 1950
datum, which is not supported by most receivers. With SA turned off the
map datum shift that was used with GRASS is not sufficient (~30 m
accurate). Further i need projecting/inverse projecting. All this should
be done with no or little user input, which needs some programming (on
the GRASS GIS side!).

As i do not want to re-invent the wheel, i want to go with an existing
library (my favorite is JEEPS, but there is currently no NMEA-support in
this library).


Andreas Lange, 65187 Wiesbaden, Germany, Tel. +49 611 807850
Andreas.Lange at Rhein-Main.de, A.C.Lange at GMX.net

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