[Gvsig_english] gvSIG mobile and submeter gps

[Juan Lucas Dominguez Rubio]

Thanks, Alberto.
 
As far as I know, enhanced GPS systems follow one of these approaches:
 
(1) Real-time corrections: the GPS receiver produces the so-called "raw data" and then some sophisticated software combines these raw data with some external infomation (corrections) to produce high-quality position information, which is immediately delivered to the GIS application.
 
(2) Post-processing: similar to previous case, but raw data is simply stored and taken to an office where it is processed with sophisticated desktop software to extract high-precision data.
 
(3) Smart receivers: a high-performance GPS receiver combines conventional GPS data with other data (WAAS, EGNOS or other) to produce accurate position information, which is then used as input for the GIS software.
 
 
According to the description available here [1] the SXBlue device seems to provide all those approaches.
 
gvSIG Mobile can only enjoy option (3) because it does not perform real-time correction and of course does not perform post-processing.
 
Therefore, my guess is that you'll get 2-feet accuracy because gvSIG Mobile will be receiving improved NMEA position data which has been produced by the SXBlue device using SBAS systems.
 
[1] http://www.sxbluegps.com/sxblue-advantage.html
 
 
Regards,
 
Juan Lucas Domínguez Rubio
---
Prodevelop SL, Valencia (España)
Tlf.: 96.351.06.12 -- Fax: 96.351.09.68
http://www.prodevelop.es <http://www.prodevelop.es/> 
---

________________________________

De: gvsig_internacional-bounces at listserv.gva.es en nombre de Alberto Riva
Enviado el: mar 13/09/2011 15:50
Para: gvsig_internacional at listserv.gva.es
Asunto: Re: [Gvsig_english] gvSIG mobile and submeter gps



Hi Maxime,
I used Gvsig Mobile with the Sxblue without problems. I found problems 
with other softwares because they are not supporting NMEA $GPGGA 
messages with 5 decimal digits (like those produced by the sxblue).

Regards
Alberto

Citando vert_de_terre <vert_de_terre at hotmail.com>:

> Hi,
>
> I'm interested in using gvSIG mobile on a PDA in combination with the sx
> blue submeter gps, I was told that some mobile software might lose some
> precision in regard to position. The use of the submeter gps would than be
> less interesting...
>
> Does anyone know if this is the case with gvSIG or even at all??
>
> thanks
>
> Maxime
>
> --
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