Here's an example of aligning Bing Maps imagery. This first image shows the default view of Bing Maps in Potlatch 2 and with GPS traces loaded (the yellow arrows show the offset needed to align the imagery): http://wiki.openstreetmap.org/wiki/File:Bing_not_yet_aligned_in_GMA,_Cavite.jpg
This next image shows the Bing Maps layer moved to provide a best fit alignment with the GPS traces: http://wiki.openstreetmap.org/wiki/File:Bing_now_aligned_in_GMA,_Cavite.jpg This last image shows streets traced from Bing Maps now that it is aligned: http://wiki.openstreetmap.org/wiki/File:Bing_now_aligned_and_traced_in_GMA,_Cavite.jpg Tips: When trying to align the image, look over a larger area where GPS traces are available and do a best fit over that area. In addition, the best spots to inspect for alignments are intersections and curves in the roads. On Thu, Jan 6, 2011 at 2:03 AM, Eugene Alvin Villar <sea...@gmail.com> wrote: > Hi guys, > > Please be careful in tracing from Bing Maps aerial imagery. It is > known that some of the imagery is not aligned to the correct position. > To show an example, please see this Bing maps screenshot: [1]. The > image shows the boundary between two satellite imagery. The imagery on > the top covers Metro Manila is is for the most part correctly > positioned. The imagery at the bottom covers parts of Cavite, Laguna, > Batangas, and Rizal[3] and is *not* positioned correctly. Notice that > the residential streets do not line up. > > In order to avoid the misaligned imagery problem that has been > plaguing contributors in Google Map Maker, please try to align the > imagery to GPS tracks or known good data before tracing. > > In Potlatch 2 and Merkaartor 0.17, the imagery can be moved by > pressing down the spacebar then dragging. I don't know how to do this > in JOSM but it also has a way to move the background image. > > > [1] > http://wiki.openstreetmap.org/wiki/File:Bing_misalignment_in_Daang_Hari_-_Bacoor.jpg > [2] http://www.openstreetmap.org/?way=28738861 > [3] http://www.openstreetmap.org/?way=87284547 > -- http://vaes9.codedgraphic.com _______________________________________________ talk-ph mailing list talk-ph@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ph
