On Thu, Dec 18, 2008 at 6:16 PM, Beej Jorgensen <[email protected]> wrote:
> Hey all, > > This is sort of a general question with a specific example, namely, > Marin County. > > Marin County (just north of the Golden Gate Bridge and San Francisco, > California) already exists in OSM. It's made of bad TIGER data that has > been partially corrected (by myself and others). Streams and trails > have been added. Parks have been outlined. > > Now it has recently come to light that Marin County provides Free data > covering the county, and this Free data is of excellent quality. Roads, > trails, hydro, and even structure footprints are included. > > Now, there are a few courses of action I can imagine. > > 1. Indiscriminately blow away all of Marin and replace it with County > data. If you made changes, tough luck. > > 2. Discriminately blow away specific pieces of the data and replace them > with County data. For example, maybe just Mill Valley's roads could be > replaced, because very little correction has been done there. > > 3. Using JOSM or somesuch, visually overlay the OSM data over the County > data and manually adjust and add ways (cut-n-paste to add) as appropriate. > > I doubt there's a specific course of action that would work for all > cases like we have in Marin County, but are there any other approaches > people can think of, or pros or cons? > > -Beej > Sonoma county (just to the north of Marin) seems to have free data available, too. As discussed with the Canada import, this would be a great opportunity to improve JOSM with tools for selective data merging. One of the better ideas I've seen is the possibility to copy individual elements from a GIS source layer to an OSM editing layer. Karl
_______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
