[Talk-GB] Imagery offset at Banister House

[Warin]

On 8/1/21 9:37 pm, Mat Attlee wrote:
> At some point I am going to add all the solar panels on top of 
> buildings at Banister House 
> (https://www.openstreetmap.org/way/546227680) though in looking into 
> this I noticed that many of the buildings have different offsets with 
> the Bing imagery and some of their traces need some tweaking. When 
> tracing in the panels should I adjust any of this and if so what 
> approach should I take?

Yes, improving the accuracy is fine if you have the time and inclination.

Why Bing and not Esri? Looks to be less initial offset from OSM data to 
the Esri imagery compared to the Bing imagery. Arrr the Bing imagery is 
more up to date - has the solar panels. Never the less I'd use the Ersi 
to map the building outlines so they are consistent to one another. Then 
use the Bing for the solar panels - adjusting the Bing imagery for the 
offset.

In this area both Bing and Ersi appear to have the imagery taken from 
directly overhead resulting in no parallax error occurring if you trace 
the top of the building as the base of the building is directly 
underneath the roof.

I usually take the OSM road data as a reference, this is more likely to 
be checked against GPS data from cars so more trust worthy than imagery. 
Also works where there are no GPS traces available. In any event the map 
needs to be consistent - even if the data is offset by 10 meters in one 
direction, as long as everything appears relative to one another then it 
'looks' ok and people on the ground will simply adjust to that offset.