Since I am also interested in this discussion I'd like to crosspost my answer also to the talk mailing list:
Hello Gerhardus, >In the absence of immediate local presence, is tracing acceptable and not >wasted effort. Personally I only do aerial image mapping to a limited extent because I fear that I will map wrong objects (e.g. nonexisting buildings, roads) because of outdated bing images. I feel much more comfortable to do bing mapping when I also do know the surrounding by own survey. However, I would follow a pragmatic approach: E.g. If there is no railway at all in the map, and you think that it is likely that the railway is still there I would go for remote mapping. Offset Problem: Maybe you could compare objects already being mapped on a large scale ( larger towns ) and only do large scale mapping like major roads, but no micro mapping like lake boundaries on a 50 m scale without having better offset information. Michael Am 01.12.2012 13:59, schrieb Gerhardus Geldenhuis: > Hi > I have mainly been doing tracing of Bing images in far flung corners of the > world where I have been. However I have been reading about offset problems > with Bing imagery and was wondering if this would all be wasted work? > > I have mainly been doing work in Zimbabwe and South Africa with work being > classified as: > > * Tracing and classing buildings > * Making lake outlines more accurate. Lake Kariba as an example is a bit > rough and ready. This is mainly prep work so I can add marinas and other > amenities. > * Tracing railway lines and roads in northern Zimbabwe. > > > I might revisit a number of the places I have edited and will then be able > to get some GPS traces, building names etc that I could use to compare offset > with. But in the meantime is there any other way to determine the offset of > satellite imagery? > > So to summarize my questions: > > * In the absence of immediate local presence, is tracing acceptable and not > wasted effort. > * Is there a reliable way to determine offset in a specific location > without GPS track data > > Regards > > -- > Gerhardus Geldenhuis > > > _______________________________________________ > newbies mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/newbies
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