[OSM-talk] protocol for adding buildings using aerial imagery?
charlie at cferrero.net
charlie at cferrero.net
Tue Dec 28 05:38:38 GMT 2010
Erin Korris (ekorris at yahoo.com) wrote:
> Hello:
>
> I am wondering if there is a rule to follow when tracing buildings
> using aerial
> imagery. On the default, Yahoo imagery, the buildings are slightly
> displaced so
> in addition to the roof you can see the foundation of certain sides of the
> building. Should this be ignored and the building drawn based on the roof?
>
> Thanks
>
>
>
This is a major issue when tracing tower blocks - the taller the
building the more the roof appears to be displaced relative to the
floor due to the perspective of the plane taking the photos. I have
always tried to map the base because, ultimately, a map is a
representation of what's at ground-level. If you mapped roofs you'd
get very tall buildings overlapping the surrounding roads.
--
Charlie
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