<HTML><HEAD><TITLE>Re: [Gvsig_english] gvSIG mobile and submeter gps</TITLE>
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<DIV><FONT face="Times New Roman" color=#000000 size=3>Thanks, Alberto.</FONT></DIV>
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<DIV>As far as I know, enhanced GPS systems follow one of these approaches:</DIV>
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<DIV>(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.</DIV>
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<DIV>(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.</DIV>
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<DIV>(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.</DIV>
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<DIV>According to the description available here [1] the SXBlue device seems to provide all those approaches.</DIV>
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<DIV>gvSIG Mobile can only enjoy option (3) because it does not perform real-time correction and of course does not perform post-processing.</DIV>
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<DIV>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.</DIV>
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<DIV>[1] <A href="http://www.sxbluegps.com/sxblue-advantage.html">http://www.sxbluegps.com/sxblue-advantage.html</A></DIV>
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<DIV>Regards,</DIV>
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<DIV><FONT face="Courier New" size=2><FONT face="Times New Roman" size=3>Juan Lucas Domínguez Rubio<BR></FONT>---</FONT></DIV></DIV>
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<DIV><FONT face="Courier New" size=2><FONT face="Courier New" size=2><FONT face="Courier New" size=2>Prodevelop SL, Valencia (España)</FONT></DIV>
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<DIV><FONT face="Courier New" size=2>Tlf.: 96.351.06.12 -- Fax: 96.351.09.68<BR></FONT><A href="http://www.prodevelop.es/"><FONT face="Courier New" size=2>http://www.prodevelop.es</FONT></A><BR><FONT face="Courier New" size=2>---</FONT></DIV></FONT></DIV></FONT></DIV>
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<FONT face=Tahoma size=2><B>De:</B> gvsig_internacional-bounces@listserv.gva.es en nombre de Alberto Riva<BR><B>Enviado el:</B> mar 13/09/2011 15:50<BR><B>Para:</B> gvsig_internacional@listserv.gva.es<BR><B>Asunto:</B> Re: [Gvsig_english] gvSIG mobile and submeter gps<BR></FONT><BR></DIV>
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<P><FONT size=2>Hi Maxime,<BR>I used Gvsig Mobile with the Sxblue without problems. I found problems <BR>with other softwares because they are not supporting NMEA $GPGGA <BR>messages with 5 decimal digits (like those produced by the sxblue).<BR><BR>Regards<BR>Alberto<BR><BR>Citando vert_de_terre <vert_de_terre@hotmail.com>:<BR><BR>> Hi,<BR>><BR>> I'm interested in using gvSIG mobile on a PDA in combination with the sx<BR>> blue submeter gps, I was told that some mobile software might lose some<BR>> precision in regard to position. The use of the submeter gps would than be<BR>> less interesting...<BR>><BR>> Does anyone know if this is the case with gvSIG or even at all??<BR>><BR>> thanks<BR>><BR>> Maxime<BR>><BR>> --<BR>> View this message in context: <BR>> <A href="http://osgeo-org.1803224.n2.nabble.com/gvSIG-mobile-and-submeter-gps-tp6787424p6787424.html">http://osgeo-org.1803224.n2.nabble.com/gvSIG-mobile-and-submeter-gps-tp6787424p6787424.html</A><BR>> Sent from the gvSIG users mailing list archive at Nabble.com.<BR>> _______________________________________________<BR>> Gvsig_internacional mailing list<BR>> Gvsig_internacional@listserv.gva.es<BR>> <A href="http://listserv.gva.es/cgi-bin/mailman/listinfo/gvsig_internacional">http://listserv.gva.es/cgi-bin/mailman/listinfo/gvsig_internacional</A><BR>><BR><BR><BR><BR>----------------------------------------------------------------<BR>This message was sent using <A href="http://www.webhosting24.com/">http://www.webhosting24.com</A><BR><BR>_______________________________________________<BR>Gvsig_internacional mailing list<BR>Gvsig_internacional@listserv.gva.es<BR><A href="http://listserv.gva.es/cgi-bin/mailman/listinfo/gvsig_internacional">http://listserv.gva.es/cgi-bin/mailman/listinfo/gvsig_internacional</A><BR></FONT></P></DIV></BODY></HTML>