[HOT] Spot-6 images of Guinée / Northern Liberia available, job 489

Michael Judex m.judex at gmx.de
Fri Apr 4 19:05:36 UTC 2014

Dear all,

I'm just starting to map roads etc. for this job with the SPOT-6 imagery 
in NIR. The already existing major roads have a significant offset to 
the satellite image (e.g. major road from Macenta to Voinjama). Should 
the offset be corrected or is the geometric correction of the SPOT 
images not sufficient?


Am 04.04.2014 15:26, schrieb Jean-Guilhem Cailton:
> Hi,
> Airbus Defence and Space, Geo-Intelligence has donated Spot-6 images,
> acquired between 2013-10-13 and 2013-12-11, that cover a large part of
> the area of the border between Northern Liberia and Southern Guinea,
> including the towns of Voinjama and Kolahun in Liberia, as well as the
> cities of Guéckédou and Macenta in Guinée, and their surroundings.
> Job 489 has been set up on the Tasking Manager:
> http://tasks.hotosm.org/job/489
> For the cities of Guéckédou and Macenta, where higher resolution
> Pleiades images are available and that were already mapped (jobs 469 and
> 471), it is better to keep using the Pleiades images as geometrical
> reference, as they have better accuracy (6.5 m CE 90 without GCPs).
> Use source=Spot-6, Airbus
> Best wishes,
> Jean-Guilhem
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