[HOT] imagery date

[Michael Heißmeier]

Ralf Stephan, 2017-06-14 16:18:
> Hello,
> in working on the project 2768 (Northern Borno) I encountered tasks where our 
> imagery (Bing, DG, Mapbox) is so out of date that work is difficult because 
> somehow other mappers (from Missing Maps?) have added lots of new 
> buildings/roads that don't show in the above imagery. But the buildings are 
> even visible in Google Maps:
> https://www.google.de/maps/@11.882244,13.2607636,452m/data=!3m1!1e3?hl=en 
> <https://www.google.de/maps/@11.882244,13.2607636,452m/data=%213m1%211e3?hl=en>
>
> The Premium DigitalGlobe imagery has the (tile info) date of this week but 
> doesn't show these buildings. Neither does older Bing imagery of the area.

Bing imagery in this area has a capture date from February 2014, the 
DigitalGlobe layers do not reveal their capture dates. The "last modification" 
date on the tile info window is always a current date and does not indicate when 
these images were taken. DigitalGlobe has a "vintage map" for the standard layer 
which for this area indicates capture dates from 2015. The Premium layer mostly 
fills gaps with higher resolution or lower cloud cover but may provide older 
imagery (https://mapsapidocs.digitalglobe.com/docs/imagery-and-basemaps)

> What's wrong with the imagery we use? Is it really this fresh? What imagery is 
> really the newest and how to access it?

The buildings mapped in OSM in this area are mostly from HOT TM project 2635 
which used recent imagery kindly provided by Airbus specifically for this 
mapping project. Such images have to be negotiated on a case-by-case basis if 
available "standard" imagery proves to be too old or of insufficient resolution. 
Unfortunately there is no way how to tell which of the available imagery layers 
provides the newest imagery.

> Regards,
>
>
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Best Regards

/Michael
(osm:michael63) /
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