OpenStreetMap
I am a former professional GIS technician, including two years of digital orthophotography Quality Control. Is there any way to use higher resolution background imagery in OSM as an alternative to Yahoo? I apologize if this is covered in a FAQ somewhere.
Discussion
Comment from wallclimber21 on 19 April 2010 at 21:18
Yes, if you can find tiles that are TMS compatible. The Potlatch editor has an option to fill in a custom URL to a TMS server. I've done this many times with my own generated tiles (as I described here: @wallclimber21/diary/8106 and a bit also here: @wallclimber21/diary/8209 )
Comment from Komяpa on 19 April 2010 at 21:21
You can use any WMS with license-compatible images in JOSM.
Comment from davespod on 19 April 2010 at 21:28
Yes, so long as either they are public domain, released under a licence compatible with OSM's or you have the explict permission of the copyright holder to trace them for use in OSM. So for example, Google Satellite is definitely not allowed (except in one or two very limited cases, e.g., Haiti, where they have given permission in order to allow humanitarian mapping to take place). Yahoo! imagery is allowed because they have given specific permission.
Some useful links
osm.wiki/FAQ#What_images_and_maps_may_I_use_to_make_maps_from.3F
osm.wiki/Copyright
osm.wiki/Potential_Datasources