Hi! With other contributors in Connecticut, we would like to import building footprints. We have evaluated different data sources, and concluded that no Connecticut-wide sources were usable without a lot of manual work to fix building geometry.
We found that the WestCOG has very accurate building footprint data on its territory (south west Connecticut), available online and with a compatible license (CC0): http://data.westcog.org:8080/GIS_data/Buildings.gdb.zip That's 513,141 buildings, and 296,423 building parts in some of them, that cover this territory: https://westcog.org/wp-content/uploads/2015/08/WestCOG_Locus_Map-e1439920850177-790x1024.jpg Other COGs unfortunately don't share this data online. We hope that a successful import could be a convincing argument for other COGs to open their data. We have documented our current plan at https://wiki.openstreetmap.org/wiki/Connecticut/Western_COG_Building_Import on the wiki. We have contacted local mappers of this part of Connecticut (we are based in and around New Haven, not is south-west Connecticut), with no negative feedback and 2-3 positive responses. We have created a process to convert the data from WestCOG to OSM tags and files that can easily be loaded in JOSM. We have never done an import before, so we'd appreciate any advice on how to properly do the import. From our reading the wiki, we should use a separate user to import the data. Is that one shared user for the import, or one user for each person importing data? We have identified potential issues with this import: roads and waterways come from an old import and might very well cross the buildings we'd like to import. For now, we have a task on the osmus task manager to try and correct road geometry (currently finished at 50%) that covers Fairfield County (WestCOG is a part of Fairfield county): https://tasks.openstreetmap.us/project/193. This is not going very fast, so we'd like to start the import even though we haven't finished the tasks. We plan to fix road and water issues as we encounter them instead, while encouraging people to go and fix them independently from our import. WestCOG currently has almost no building mapped, but obviously we plan to keep existing buildings and only import buildings that are not yet mapped. What is a good way to split this import? Is there a good size per changeset that you could recommend? Thanks for your help! Julien _______________________________________________ Talk-us mailing list Talk-us@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-us