Changeset: 39513544
More tributaries of the Gunpowder Falls.
Closed by asciiphil
Tags
created_by | JOSM/1.5 (10168 en) |
---|---|
source | MD iMap;NED;NHD |
Discussion
-
Comment from ElliottPlack
Phil, I've been looking for a dataset for adding hydrology to OSM that is both high-resolution and accurate. This changeset matches those characteristics, but the NHD data (even NHDPlusv2) isn't very accurate in my experience. For instance, look at https://i.imgur.com/a4Z9hTw.png and see how off the NHD flowline is. Are you manually correcting each flowline with imagery, or is there some other NHD source that I am missing. Thanks!
-
Comment from asciiphil
I'm not even correcting flowlines. I'm tracing lines directly from imagery, assisted by an overlay of contour lines from elevation data and an NHD overlay that I mostly use to get the names of waterways.
The results are pretty accurate, but doing it is rather time-consuming.
- 420307026, v1
- 420307027, v1
- 420307028, v1
- 420307029, v1
- 420307030, v1
- 420307031, v1
- 420307032, v1
- 420307033, v1
- 420307034, v1
- 420307035, v1
- 420307036, v1
- 420307037, v1
- 420307038, v1
- 420307039, v1
- Compass Run (420307040), v1
- Dykes Creek (420307041), v1
- Dykes Creek (420307042), v1
- Dykes Creek (420307043), v1
- Falls Road (420307044), v1
- Georges Run (420307045), v1
Welcome to OpenStreetMap!
OpenStreetMap is a map of the world, created by people like you and free to use under an open license.
Hosting is supported by Fastly, OSMF corporate members, and other partners.
https://openstreetmap.org/copyright | https://openstreetmap.org |
Copyright OpenStreetMap and contributors, under an open license |