(PATCH on hold) EHPE support

[hopet@…]

Some GPS devices produce only EHPE (estimated horizontal error) instead of HDOP. This is the case, e.g., for @Trip iGotU GT-120. We've extended igotu2gpx, so that EHPE is given as a part of GPX extensions. The attached JOSM patch allows to render EHPE in the map in a similar way to HDOP. Patch is against current SVN.

[hopet@…]

JOSM patch

[stoecker]

I not really like that patch a lot, as this is a very device specific workaround which needs another workaround in another software. The HDOP information is part of the standard GGA message. What does the mentioned GPS device produce instead of GGA?

[anonymous]

It doesn't give out the information using NMEA protol at all. From this perspective, it's rather pure GPS logger that stores GPS data internally on a flash a there are tools both for Windows and Linux to extract GPX. According to the manufacturer, the device doesn't store HDOP/VDOP/PDOP at all and thus it si not possible to extract it. And once you are left with EHPE only, there's no correct way to convert it to HDOP, as this conversion also depends on other non-constant parameters (SV, etc.). The EHPE is given in meters, so it can be easily displayed directly in JOSM; the only thing is it is not part of the GPX standard and needs to go into extensions.

[hopet@…]

Is there any chance for including this into the official source? I believe it support larger class of devices, that either produce EHPE only, or additional to HDOP information (part of Garmin NMEA messages).

[hopet@…]

Patch against rev. 3208

[hopet@…]

Patch has been updated against latest stable revision 3208. It is still needed to draw EHPE circles from EHPE-only devices.

[stoecker]

Can't this be transformed into a plugin, as I still don't like it.