Hi Bjoern - Based on my experience working on that import with Akros, I would say that matching the DG imagery is best. Bing and DG imagery was used for the original creation of the data before it was imported. The offset varied quite a bit across the region and DG was much better.
Nate Nate Smith @nas_smith <https://twitter.com/nas_smith> On May 17, 2017 at 2:43:19 AM, Bjoern Hassler ([email protected]) wrote: Dear all, I'm looking at this buildings import, https://wiki.openstreetmap.org/wiki/Northern_Zambia_Buildings_Import For the buildings It includes buildings near Fiwila, -13.9710, 29.6019, Zambia. As well as East (e.g. -13.9762965, 29.5746642) and West (e.g. -13.970185, 29.6203484) of Fiwila. In Fiwila, the import matches Bing/DG imagery, and the road matches those too. Hwoever, East and West, there is a clear offset of about 20m East-West. The wiki page doesn't say how the data was collected. The wiki page states "The main goal of this work is to not only do a large import of buildings (268k records) into Zambia, but set an example for how Akros and other organizations can *use field based operations* to contribute back to OpenStreetMap. *Data was verified by Akros Global Health contributors with assistance from the USAID GeoCenter's Remote Sensing Program*." (my bold). So any thoughts on whether I should go by the Akros data (and offset Bing/DG) or whether I should adjust the Akros import (in that area) to match bing? Many thanks! Bjoern _______________________________________________ Imports mailing list [email protected] https://lists.openstreetmap.org/listinfo/imports
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