Re: [talk-au] Snapping Major regional roads to GPS traces
Thanks all for your comments; - Yes I am aware of multipath phase errors, HDOP and VDOP problems etc. My imagery camera also has excessive averaging and interpolation, so I not only upload its trace but also that from a separate roof mounted GPS sender unit. - Re old traces. I can "cheat" a little by also turning on the Mapillary layer, thus identifying the age. - My big concern is more long straight or shallow corner roads that differ from reality. ie is it smart to fix (or at east reduce) the road error before placing new features that are relative to it. A long straight GPS trace probably only has a small lateral error. - Yes I have used the DCS base maps, but unfortunately I see most problems in Qld. - I am surprised by the suggestion to fix the overhead imagery instead. I would have assumed that OSM/ID editor references another website via an API by co-ordinates etc and any error correction of tiles would be on that site, not OSM's? Is there really an offsets database in use? I would expect that it would be far more important to fix errors in densely populated areas before rural/sparse ones though. Cheers ___ Talk-au mailing list Talk-au@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-au
Re: [talk-au] Snapping Major regional roads to GPS traces
On 14/5/21 4:23 pm, Bob Cameron wrote: Just checking if this is an okay thing to do. ie moving a major road so it is centred on GPS traces - assuming there enough data for accuracy (eg bidirectional, multi trace etc) Just a word of caution, to say that using historical GPS data will undo updates covering recent road straightening or other realignments. The traces are probably more accurate than overhead imagery. Other features placed relative to roads will also need moving? I've moved rivers and railway lines in the past when that need was unambiguous. ___ Talk-au mailing list Talk-au@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-au
[talk-au] Snapping Major regional roads to GPS traces
Just checking if this is an okay thing to do. ie moving a major road so it is centred on GPS traces - assuming there enough data for accuracy (eg bidirectional, multi trace etc) The traces are probably more accurate than overhead imagery. Other features placed relative to roads will also need moving? Reason I ask is a concern that there may be an automated process that adjusts existing roads. Tnx ___ Talk-au mailing list Talk-au@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-au
