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Hi! I was about to do my first edits (add a few sidewalks), but when switched to edit I noticed that my whole neighborhood has offset comparing to aerial imagery. Here you can clearly see that road didn't match itself, offset is about 5 meters –

What should i do? Draw my sidewalks ignoring mismatch?

asked 29 Oct '15, 22:54

H1D's gravatar image

accept rate: 0%

edited 30 Oct '15, 05:58

aseerel4c26's gravatar image

aseerel4c26 ♦


(semi-offtopic) By the way: note, that it may be more useful to map sidewalks "as refinement to a highway" object, so you do not need to "draw" new object if you want to add sidewalk information.

(30 Oct '15, 06:09) aseerel4c26 ♦

Hi, welcome to OSM!

Either the aerial imagery is at a wrong position or the current OSM data (if people forgot/did not have the sources for enough alignment) or both. You should try to find out by also looking at gps traces (there are many already uploaded in your area). If you are unsure, please align the aerial imagery (all our editors offer this feature) to fit the pre-existing OSM data in this area and then start to do your new sidewalks.

See (section "Align Aerial Imagery before Tracing") . Or bing-osm-and-my-waypoints-all-misaligned-who-do-i-trust or aligning-roads-to-proper-location or alignment-of-track-vs-background-imagery and more older questions here on this site.

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answered 30 Oct '15, 06:09

aseerel4c26's gravatar image

aseerel4c26 ♦
accept rate: 18%

edited 30 Oct '15, 06:16

alt textIn addition to aseerel4c26's answer. In potlatch2 i looked at all the traces and bing which showed that of the two roads running north to south the west one is correct but the east one is a little off. the east to west road looks ok and the buildings are also ok when Bing is re-aligned.
Before trusting aerial use the traces to check alignment before changing or adding new stuff. Bing is usually aligned accurately and mapping was much harder before we were allowed to use it. But the old saying "the camera sometimes lies" should be remembered. NOTE added jpeg of Id editor and how to get all traces and where the alignment setting is.

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answered 30 Oct '15, 11:06

andy%20mackey's gravatar image

andy mackey
accept rate: 4%

edited 30 Oct '15, 19:04

aseerel4c26's gravatar image

aseerel4c26 ♦


From looking at edits in the linked area I think that the person asking the question's using iD, so the screenshot above should help.

(30 Oct '15, 12:13) SomeoneElse ♦

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question asked: 29 Oct '15, 22:54

question was seen: 3,110 times

last updated: 30 Oct '15, 19:04

NOTICE: is no longer in use from 1st March 2024. Please use the OpenStreetMap Community Forum