<HTML dir=ltr><HEAD><TITLE>Re: [OSM-talk] Raw GPS layer</TITLE>
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<DIV dir=ltr><FONT face="Times New Roman" color=#000000 size=3>When you say "track log" you mean a GPX file? It's very easy to convert a SHP file into a GPX file. I have done it myself many times, so the existence of such GPX file proves nothing. Am I misunderstanding the whole thing? :-/ </FONT></DIV>
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<DIV dir=ltr>Cheers,</DIV>
<DIV dir=ltr>Lucas</DIV></DIV>
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<FONT face=Tahoma size=2><B>De:</B> talk-bounces@openstreetmap.org en nombre de J.D. Schmidt<BR><B>Enviado el:</B> vie 22/02/2008 2:47<BR><B>Para:</B> 80n<BR><B>CC:</B> OSM-Talk<BR><B>Asunto:</B> Re: [OSM-talk] Raw GPS layer<BR></FONT><BR></DIV>
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<P><FONT size=2>80n skrev:<BR>> At the moment we are not signalling clearly enough that *every* track log is<BR>> valuable to the project, even for places that have already been mapped.<BR>><BR>> Does anyone have any stats on number of edits vs. number of tracklogs by<BR>> user? It might be quite revealing about who does and who doesn't upload<BR>> their tracklogs (coastline uploaders and serial Yahoo! tracers excepted, of<BR>> course).<BR>><BR><BR>I can only speak for myself, but 98% of the edits I've made in JOSM, has<BR>been made from my gps logs. The remainder 2 % has been from yahoo<BR>imagery, mostly while fixing the danish coastline.<BR><BR>My workflow generally is like this :<BR>1) Open tracklog in JOSM.<BR>2) Get OSM data for the area covered by the tracklog.<BR>3) Make, tag and name new ways, correct possible bad ways along the<BR>tracklog.<BR>5) Upload edits.<BR>4) Gzip tracklog, and upload it via the website, tagging it with area,<BR>and give fairly detailed description of roads covered by the tracklog.<BR>5) Drive out and cover a new area.<BR>6) Repeat, rinse and lather...<BR><BR>and lately<BR><BR>7) Hope TomH doesn't throw my logs away... Again... :P<BR><BR>I used to have around 5000000 gpspoints in 512+ files in the stats, but<BR>since the last GPX Trace displacement, I'm down to 2763239. I haven't<BR>bothered with reviving my 3000000 part of the 55949581 orphaned<BR>gpspoints, since the perlscript supplied for that operation indicates I<BR>have to re-enter the detailed descriptions again, and that would<BR>probably mean re-entering descriptions for 200+ files. It was enough of<BR>an ordeal the first time around.<BR><BR>But I concurr, the importance of GPS tracklogs tends to be forgotten,<BR>after we got the possibility to trace over the Yahoo imagery. I still<BR>feel that "gettin' out there with the GPS" is necessary. Both for my own<BR>enjoyment (and health), as well as for observing changes and getting<BR>street and POI names.<BR><BR>So a GPS trace layer gets my vote, although technically we should look<BR>into some way of "merging" multiple tracks into a single line. I know<BR>that a lot of my tracks runs along the same roads a fsckin' great many<BR>times, with the inherent "jitter" of GPS tracks being different by a few<BR>meters due to sat constellation, H/VDOP, Receiver sensitivity and what<BR>not. I.E. a map layer plotting all the traces in for instance central<BR>Copenhagen, would end up being one black box in layers below 15.<BR><BR>I've just for kicks plotted 12 months worth of gps traces using a<BR>trackwidth of 1 pixel with Kismet's gpsmap utility, and Copenhagen<BR>definitely is just a blur at what is equivalent to our Layer 10.<BR><BR>Dutch<BR><BR>_______________________________________________<BR>talk mailing list<BR>talk@openstreetmap.org<BR><A href="http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk">http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk</A><BR></FONT></P></DIV></BODY></HTML>