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Correcting offset in HiCO geolocation

Posted: Tue Sep 30, 2014 3:02 am America/New_York
by obdaac_forum_user
Hi, an earlier post in this forum explained the reason for some HiCO images not being geolocated quite correctly. I noticed when viewing a cloud free image in SeaDAS 7.0.2 that when I enabled the coastal mask, that it did not line up correctly with the image (in this case quite a few km off). But after reading the help and running quite a few internet searches I am not sure of the best workflow for correcting this.Is SeaDAS the best tool? How do I actually update the geocoding - I presume I can do it with ground control points and a GIS/Google Earth style program to get accurate feature coordinates, but I'm not sure how. Is there a tutorial? Is it possible to 'move' the image so that it lines up with the coastal mask?Any tips appreciated.James

Correcting offset in HiCO geolocation

Posted: Thu Oct 02, 2014 3:02 pm America/New_York
by OB.DAAC - SeanBailey
James,

There is a ground control point feature.
With this you can "attach" a geocoding based on the GCPs you define (need at least three know points, the more the better). 
I've discovered that the landmask/coastline feature isn't recognizing this attached geocoding - we'll look into that - but
you can reproject with this geocoding and get the data to line up better with the real geography.

Our next major push is for documentation/tutorials, so in the hopefully-not-to-distant-future there will be a nice tutorial
on this and other really useful features :grin:

Sean