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Ben_on_Lemmy@lemmy.ml

Can I assume orthoimagery is the best for tracing buildings? (lemmy.world)

submitted 2 months ago by BitSound@lemmy.world to c/openstreetmap@lemmy.ml

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I'm trying to correct local buildings on OSM. I've noticed that some of the buildings were traced before according to one set of satellite images, but are off according to others. One of the options for a background while editing that I've got is called orthoimagery. Can I assume that that is the best set of satellite images for tracing buildings from?

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[–] InsertUser@en.osm.town 2 points 2 months ago

@BitSound @openstreetmap
Depends on the layer. Some of the ones described as ortho imagery are provided by government sources and are really closely aligned to very well known survey points. Others aren't.

Even if you do have a layer done to a very high standard it could be older than some of the lower accuracy ones so there will be individual buildings that have been replaced or remodelled and the later source should be used.