Thanks for the answer! I've another related question/issue: There is a
systematic geometric shift between SPOT-6 images of task 489 (Guinée /
Northern Liberia border area) and Pleiades-1A images of task 471 (only
for the town of Macenta, which is included geographically in 489). I
think that an offset of 10.44; 14.24 (in JOSM) for the SPOT-6 images is
good to have a proper fit to the Pleiades images.
So my questions are:
- is the geometric accuracy of the Pleiades better than SPOT-6? (I
assume yes)
- do we then have a systematic geometeric distortion in task 489 for the
edits that relied only on the SPOT-6 imagery? If yes can we correct
this? (maybe the the only way to really fix offsets between different
images are GPS ground control points...)
I think it could be helpful to have an instant overview of ALL available
imagery for a specific area. If a mapper opens a task only the dedicated
imagery is listed in the task instructions. Is there a simple way to
achieve this?
Thanks for your support!
Michael
Am 05.04.2014 11:19, schrieb Pierre Béland:
Great. Thanks both.
Pierre
------------------------------------------------------------------------
*De :* Jean-Guilhem Cailton <[email protected]>
*À :* Michael Judex <[email protected]>; [email protected]
*Envoyé le :* Vendredi 4 avril 2014 22h10
*Objet :* Re: [HOT] Spot-6 images of Guinée / Northern Liberia
available, job 489
Hi Michael,
The existing roads were probably based on Landsat, the geometric
accuracy of which is lower than Spot-6. So if you feel that adjustment
is needed, the pre-existing road should probably be adjusted. This would
also make it possible to have a consistent geometry for tracing streets
and buildings within villages and towns.
Best wishes,
Jean-Guilhem
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