Talk:Ohio/Ohio Admin Boundary Import
Prior art
@ZeLonewolf and Korgi1: This proposal looks like a boilerplate originally written for some other state. Have you cross-checked it with the existing work documented and tracked in Ohio/Boundaries and its subpages? – Minh Nguyễn 💬 01:19, 24 July 2021 (UTC)
Townships
This proposal says townships require some research. The good news is that mapping- and tagging-related research has already been done and is documented at Ohio/Boundaries/Townships.
Please do not use TIMS as a source of townships. I'm not sure what ODOT is using that township layer for, but it corresponds to the original historical boundaries of townships, not their present-day boundaries, so they don't take into account paper townships and municipal withdrawals. For example, compare the tiny, disjointed Columbia Township in OSM with the township's much more complete boundary in TIMS, which was accurate around the year 1840. TIMS also has an "Urban Township" corresponding to the historical Millcreek, Cincinnati, and Storrs townships combined.
I would be very happy to see a concerted effort to map township boundaries, but it should not be an import relying on a single source. In order to avoid misleading boundaries, one needs to consult both the Census Bureau (either TIGER or the Census Geography series [1]) to understand the township's relation to withdrawn cities and villages, then cross-reference with USGS topographic maps and aerial imagery to refine the specific boundaries to account for the usual TIGER boundary exaggerations. The Census Bureau isn't perfect either: the bureau has sometimes invented townships for demographic convenience. I would be happy to walk participants through the nuances that I'm aware of, but please be aware that this task will require detailed research (example).
– Minh Nguyễn 💬 01:38, 24 July 2021 (UTC)
Vintage
Does anyone know the vintage of the city and village boundaries in TIMS or ODOT's process for keeping them up to date? I noticed it still has Amelia's village boundaries, even though the state oversaw the village's dissolution in 2019. – Minh Nguyễn 💬 01:40, 24 July 2021 (UTC)
Place classifications
- fix place=village to place=town or place=city
Please follow these guidelines for place classifications. Don't blindly retag based on legal status; that's what boundary_type=* is for. (The legal distinction between a city and a town in Ohio is purely based on its population, but the cutoff is different than the one OSM data consumers would be used to.) I'm not sure that many place=* POIs need to be retagged, but quite a few boundary relations could use another look at their place=* tag to make sure they match the POIs.
– Minh Nguyễn 💬 02:32, 24 July 2021 (UTC)