[OSM-talk] New mass imports over existing data
siliconfiend at gmail.com
Fri Dec 19 05:17:32 GMT 2008
On Thu, Dec 18, 2008 at 6:16 PM, Beej Jorgensen <beej at beej.us> 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?
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.
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