[Talk-gh] Maxar Premium Imagery updates around Kumasi

[Enock Seth Nyamador]

Hello,

If you haven't noticed already, Maxar Premium Imagery around Kumasi, 
Ashanti Region have been updated to some extent.

If you are mapping in/around Kumasi you might want to stop using Bing as 
primary reference for new data and also re-use as much old objects you 
can for new ones instead of deleting them via Replace Geometry [1] in JOSM.

Looking at existing data (most building footprints; thank you 
User:Sammyhawkrad), GPS traces, Street-level images and Bing which have 
been used extensively, there's a little offset off `1.06; -0.61` that 
should be applied when using Maxar Premium in Kumasi, this of course is 
not final or might not be the case for outskirts; may be a starting 
point when you are not sure.

You can always check in JOSM via the Imagery Offset Database plugin if 
there have been some saved offsets, here is a great quick start [2] on 
how it works.

It would be nice to also know the recency based on local knowledge of 
what have changed or can be seen from our nearest environment.

1. 
https://wiki.openstreetmap.org/wiki/JOSM/Plugins/utilsplugin2#Replace_geometry_.28Ctrl.2BShift.2BG.29
2. 
https://wiki.openstreetmap.org/wiki/JOSM/Plugins/Imagery_Offset_Database/Quick_Start

-- 
Best,
-Enock