Hello - I am on a quest to learn more about how administrative boundaries can be managed as relations. I have a bit of experience with these things, but I am discovering the limitations of my knowledge also. Which was the point, actually.
I would like to be able to suggest that governmental entities could manage their district geo data with OSM. I am interested in seeing why this does not work now and what can be done. Well, and it would be interesting to find out why so few cities in California actually seem to have a relation. Or perhaps I am missing it. I know that TIGER data was imported into OSM, but I am seeing some disconnects. To be precise: Using QGIS, I can load the vector files (SHP) from the following as two different layers: ftp://ftp2.census.gov/geo/tiger/TIGER2015/ELSD/tl_2015_06_elsd.zip ftp://ftp2.census.gov/geo/tiger/TIGER2015/EDGES/tl_2015_06085_edges.zip Using JOSM, I can see the "Sunnyvale East Channel": https://www.openstreetmap.org/#map=19/37.364537971457935/-122.02110206207291 I cannot see how to get the id of this way from JOSM and its tag info seems to be: boat=no intermittent=yes name=Sunnyvale East Channel scvwd:FACILITY=2026 scvwd:ROUTEID=20260 waterway=drain And in QGIS, I can see the same feature (removing empty TIGER fields): wkt_geom LINESTRING -122.0213200000000171 37.36408999999999025 -122.02097200000001465 37.36464099999999178 -122.01992900000000475 37.36629399999999634 -122.01963900000001217 37.36675400000000025 STATEFP 6 COUNTYFP 85 TLID 618169892 TFIDL 229597201 TFIDR 230278901 MTFCC P0001 HYDROFLG N RAILFLG N ROADFLG N OLFFLG N EXTTYP N GCSEFLG N OFFSETL N OFFSETR N TNIDF 39083667 TNIDT 409312163 But there seems to be no connection between the feature in OSM and the TIGER data. So, TIGER data was used to define new features? But perhaps TIGER id data was not merged onto existing features? I am certainly not seeing "tiger:tlid"="618169892" associated with this object in OSM anywhere. So, if I want to give the Sunnyvale District the relation that defines its boundaries, I cannot use TIGER data to find those lines? Or rather, I must use the TIGER data and find the line in OSM and set up the connection myself? Ok.... Any other suggestions? thanx - ray ps: My early stumblings are in my diary: http://www.openstreetmap.org/user/rayKiddy/diary Please excuse any ignorance on my part. I know a bit about the GIS practices of the state of California. I have a very small bit of experience with Santa Clara County. I have a smidgen of knowledge about the city of Sunnyvale. And I have more exposure to the Sunnyvale Elementary School District, having once been on the Board. And I develop database software and am interested in mapping applications. _______________________________________________ Talk-us mailing list Talk-us@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-us
