On 6/17/2013 10:56 AM, Clifford Snow wrote:
At last years SOTM-US conference, USGS showed a pilot program using a modified version of Potlatch2 to update GNIS database with volunteers. If they use this plan, the id tag could be used to compare OSM with the new data. It would us to compare the existing OSM data with the new GNIS data. For now I would suggest leaving that tag in OSM.
I got a chance to catch his presentation on this year's video (Thanks SOTM-US video production crew and posters!). I will be looking forward to being able to use the results of MapCorps efforts.
I agree that leaving the tag in OSM is the best course, but it's likely to only be an advisory clue when merging data, if it's used at all:
- Many times, local churches or schools had a new building built anywhere from a mile away to across town. If the name was retained, I simply moved the GNIS node. The updated GNIS information may simply mark this as XYZ school (historical) and keep its position. Or they may delete it and assign a new ID to whatever the building is now used for.
- If someone has already added a node or way representing the new GNIS object, the conflation process still needs to handle the case of same or similar name but no GNIS ID.
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