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: [email protected] en nombre de Alberto Riva Enviado el: mar 13/09/2011 15:50 Para: [email protected] 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 <[email protected]>: > 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 > > -- > View this message in context: > http://osgeo-org.1803224.n2.nabble.com/gvSIG-mobile-and-submeter-gps-tp6787424p6787424.html > Sent from the gvSIG users mailing list archive at Nabble.com. > _______________________________________________ > Gvsig_internacional mailing list > [email protected] > http://listserv.gva.es/cgi-bin/mailman/listinfo/gvsig_internacional > ---------------------------------------------------------------- This message was sent using http://www.webhosting24.com <http://www.webhosting24.com/> _______________________________________________ Gvsig_internacional mailing list [email protected] http://listserv.gva.es/cgi-bin/mailman/listinfo/gvsig_internacional
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