Thanks for the reply Michael, My concern was not so much about the imagery being out of date, as I only trace places that I am very familiar with albeit having visited a long time ago. I will be visiting a few places I have mapped soon and will be having my GPS switched on all the time. It generally has good accuracy +- 3m, so should be a good start to help correct any potential offset errors if any.
Regards On 8 December 2012 10:16, Michael S <[email protected]> wrote: > 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 because of outdated bing images.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 > [email protected]http://lists.openstreetmap.org/listinfo/newbies > > > > _______________________________________________ > newbies mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/newbies > > -- Gerhardus Geldenhuis
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