PAR L3 product - Unexpected patterns
Posted: Mon Oct 25, 2021 9:15 am America/New_York
Dear OBPG,
I would like to use the PAR product from MODIS-Aqua. I wanted to create my own yearly composites from multiple images but found unexpected 'square-shaped' patterns.
Looking at the daily L3 images, for instance 25 Apr 2021,
https://oceancolor.gsfc.nasa.gov/showim ... 4km.nc.png,
I see unexpected patterns of missing data when zomming in to my area of interest (first attached image - GulfofStLawrence_PAR L3_Daily - print screen from the link above).
Looking at the worldview pseudo true-color image overlaid with MODIS-Aqua sea ice product for the same day, we see that the area is clearly ice-free:
https://worldview.earthdata.nasa.gov/?v ... 3A00%3A03Z
Does this mean the sea ice product that is being used in the standard processing chain fails in my area of interest ?
The resulting yearly product I computed using the 'mean' operator for binning is showed in the second attached image (GulfofStLawrence_PAR L3_Yearly). There is clearly an artificial pattern there (the pattern is also seen in the OBPG's annual composites but the palette adapted to global images shows little contrast).
Can anyone suggest an option to obtain a yearly PAR image in my area of interest ?
Best regards,
Julien
I would like to use the PAR product from MODIS-Aqua. I wanted to create my own yearly composites from multiple images but found unexpected 'square-shaped' patterns.
Looking at the daily L3 images, for instance 25 Apr 2021,
https://oceancolor.gsfc.nasa.gov/showim ... 4km.nc.png,
I see unexpected patterns of missing data when zomming in to my area of interest (first attached image - GulfofStLawrence_PAR L3_Daily - print screen from the link above).
Looking at the worldview pseudo true-color image overlaid with MODIS-Aqua sea ice product for the same day, we see that the area is clearly ice-free:
https://worldview.earthdata.nasa.gov/?v ... 3A00%3A03Z
Does this mean the sea ice product that is being used in the standard processing chain fails in my area of interest ?
The resulting yearly product I computed using the 'mean' operator for binning is showed in the second attached image (GulfofStLawrence_PAR L3_Yearly). There is clearly an artificial pattern there (the pattern is also seen in the OBPG's annual composites but the palette adapted to global images shows little contrast).
Can anyone suggest an option to obtain a yearly PAR image in my area of interest ?
Best regards,
Julien