Changeset: 52996575
fixed offset and building details including housenumbers and barriers
Closed by SciamLab
Tags
created_by | JOSM/1.5 (12991 en) |
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source | my traces |
Discussion
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Comment from dieterdreist
Hello Sciam Lab,
I have seen you "fixed" offsets in this changeset. May I ask how you determined the correct position?
After your fixes there were intersections of buildings and pedestrian areas. Fixing an offset is usually quite complex, because you not only have to correct the position of one object but also the relative position of other nearby objects, and also the shape. For example lines that are straight in reality should remain straight in OSM, and angles should remain, etc.
Generally it is rarely worth the work that results from shifting things, if the offset is as small as in this changeset (1.2 meters), also because following mappers will not have the means to work with accuracy of 1 meter or submeter. -
Comment from SciamLab
Hello dieterdreist,
we've acquired the detailed data from a cadaster map. Also used few different GPS traces recorded recently. One of the building in the the changes is one of our property. -
Comment from dieterdreist
Thank you for your reply. Please be aware that we do not (only) care for absolute positional accuracy, but even more for topological / relative accuracy. Often moving one object requires to move also other objects to maintain properties like relative position and relation between things (axis, flight of facades, angles between things, etc.)
As a legal sidenote: cadastre maps don't allow for positioning of objects (no georeferencing), and they are not (AFAIK, usually) a suitable source for edits, because they are usually copyrighted (unless we are talking about out-of-copyright maps) (being the proprietor of real estate doesn't make you automatically the proprietor of intellectual property contained in the cadastre maps).
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