Does the OSM standard base map change in time using the osc files? What I need to know: if I download data of building footprints today, those building footprints are referred to which date? Do they change with time?

asked 17 Dec '13, 12:52

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udonezar
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Same question, different approach: OSM base building information for a certain area on the 10th of november is it or is it not the same as 17th of december?

(17 Dec '13, 12:55) udonezar

First thing first: do not confuse the data with its rendering. We have many uses of the data, including many renderings and the "standard" rendering you refer to, but we only have one database, which contains all our data.

That data changes very rapidly, and it is an iterative process. When you download data, it is a snapshot of the data at a particular time. If your snapshot is too old for your needs, you can download diff files which bring you to the latest version.

The data that you fetch from the main database is always "live" and current. Other sources (renderings, extracts, etc) can lag from a few minutes to a few months.

Note also that whenever something changes, the old version of the object is kept in the database as well. You can explore that in your editor or by showing the "map data layer", clicking on an object, and clicking "history" in the left pane. You'll see when the object was changed, by who, in which way, etc. You can also process historical data if you have downloaded a file that contains it.

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answered 17 Dec '13, 13:27

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question asked: 17 Dec '13, 12:52

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last updated: 17 Dec '13, 13:27

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