[OSM-talk] Good practice for updating the source tag

[maning sambale]

Hi,

What's the good practice for updating the source tag?
For example in my mapping area, the initial coastline was from an SRTM
import (source=SRTM), then somebody updated the coast using LANDSAT,
then another user updated it using Yahoo!.

I would very much like to preserve the original tag as it provides
some history on the development of the data, but the data have been
greatly modified that it does not in anyway similar to the original
coastline import.

cheers,
maning

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