Karl Newman <siliconfiend <at> gmail.com> writes: >>Are any of you aware of a conflation algorithm that "snaps" GPS tracks >>to the street grid? This could be a useful way to verify existing >>road networks and fill in any gaps.
>To do that you'd ideally want to know the margin of error for the GPS readings. >My GPS unit (Garmin eTrex Vista HCx) shows an error circle on its screen >I have a Vista HCx, too. Bafflingly, Garmin does not store the DOP with the >tracklog and there is no way to extract it after the fact (or even realtime, I >don't think). Oh, that is disappointing. >If you can get an NMEA stream, you can get the HDOP (which is what you care >about for this application). The USB-only Garmin units (like the Vista HCx) >cannot emit a NMEA stream like the serial-enabled units could. Apparently the Windows program GpsGate can convert the output from the USB Garmin devies to NMEA format. I wonder if there is a free equivalent to get it working with gpsd or similar on Linux? -- Ed Avis <[email protected]> _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
