Oceana county in the state of Michigan (USA) coordinates (ll by ur: -86.54,43.47 by -86.05,43.82) is offset to the northwest for the streets compared to imagery and to googlemaps and yahoo: http://sautter.com/map/?zoom=17&lat=43.78148&lon=-86.433&layers=B000000TFFFFFFFF I first wanted to report this disparity with the OSM street data within this area and also how could I temporarily patch this data within my OSM postgres database so that this offset is eliminated?



asked 05 Apr '11, 22:35

mitchelljj's gravatar image

accept rate: 0%

edited 06 Apr '11, 00:22

Pieren's gravatar image



Have you already compared the OSM data for the streets AND the aerial photos with exact GPS traces for that area? In some constellations OSM data can be right and only the aerial photos have an offset. Does http://wiki.openstreetmap.org/wiki/True_Offset_Process help?

(06 Apr '11, 16:27) stephan75

There aren't a lot of GPS traces there but what there are tend to match Bing (and the other imagery providers he linked to).

The problem seems to be that the Tiger imported data is offset to the NW of everything else. The (small) sample of roads that I looked at seem to be raw Tiger data; so perhaps few local mappers are active? There have been a few POIs added though.

Perhaps this is a good candidate for actually mapping the road grid on the ground before too much other work is done, so that further POIs don't get added relative to the roads in the wrong place.

(06 Apr '11, 16:51) SomeoneElse ♦
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question asked: 05 Apr '11, 22:35

question was seen: 2,432 times

last updated: 06 Apr '11, 16:51

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