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GoogleCodeExporter avatar GoogleCodeExporter commented on July 19, 2024

Original comment by [email protected] on 29 Jul 2013 at 4:55

  • Changed state: Accepted

from ledaps.

GoogleCodeExporter avatar GoogleCodeExporter commented on July 19, 2024
The issue flagged regarding the difference in SR values for path 39, row 37 in 
the L7 ETM+ product is due to the difference in ozone data and correctly 
reading it.  I looked at the ozone values that were previously (incorrectly) 
read for the OMI ozone data and the new values, for the center of the scene 
(which is close to the area being flagged).

Ozone at scene center for new code on the Dev system is interpolated between:
298  299
298  297

Ozone for scene center for old code in previous releases is interpolated 
between:
297  293
295  290

So, there are definitely some differences in the ozone values for that scene, 
mainly due to the fact that we corrected the use of the resolution in pulling 
the ozone from the appropriate location.

Furthermore, I reprocessed this scene with the new code and used the old 
resolution and scaling (which would match the previous version of LEDAPS in 
incorrectly reading the ozone data).  The resulting image produced exact 
results across all bands except for 11 pixels total, each with a difference of 
1 (attributed to differences in architectures).

Therefore, I believe this issue is due to the difference in the ozone values 
which are now being read correctly.  I will mark this as invalid/closed.

Original comment by [email protected] on 29 Jul 2013 at 8:32

  • Changed state: Done

from ledaps.

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