Nicholas and Andre -- Chris is asking about the date of the *imagery* used for tracing, not the date of the traced elements.
All -- He makes an excellent point. If imagery is several years old, then features being traced may well have changed, with the likelihood being higher for more ephemeral human-made structures. For this purpose, would be nice if imagery sets had metadata that included a creation date, but I'm looking at the TMS spec, and don't see it, or any field that could be used for it: http://wiki.osgeo.org/wiki/Tile_Map_Service_Specification -- Pat
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