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How MODIS processed climatology data
Posted: Wed Mar 15, 2023 4:54 am America/New_York
by nabilanona
I want to use the monthly climatology data of chlorophyll-a concentration from MODIS Level 3 database, is there a document that explain how this data calculated? thank you
Re: How MODIS processed climatology data
Posted: Wed Mar 15, 2023 1:54 pm America/New_York
by OB ODPS - towens
Are you asking how the means are calculated or how chlorophyll-a concentration is calculated?
The mean values are the arithmetic mean of all of the monthly means for that particular month for the entire mission.
The algorithm we use is described here :
Chlorophyll a (chlor_a; mg m-3)
Tommy
Re: How MODIS processed climatology data
Posted: Wed Mar 15, 2023 10:40 pm America/New_York
by nabilanona
Yes, I am asking about how the means are calculated. How about the outliers data? Are the outliers data removed from the arithmatical calculation?
Thank you,
Nabila
Re: How MODIS processed climatology data
Posted: Thu Mar 16, 2023 11:04 am America/New_York
by OB ODPS - towens
No - they are not trimmed in any way.
Tommy
Re: How MODIS processed climatology data
Posted: Wed Nov 13, 2024 8:58 am America/New_York
by mschmidt
Hi, I am trying to do the same and I am limiting the time span to be considered for the climatology. However, the output files indicate from the file names that the full data set was used in any case and the limitation in time is ignored.
How to deal with this?
Many thanks,
Martin Schmidt
Re: How MODIS processed climatology data
Posted: Wed Nov 13, 2024 9:29 am America/New_York
by OB ODPS - towens
We do not create temporal subsets of the climatology time series, we calculate only for the full mission. If you require a temporal subset, you will need to download the monthly files and calculate the means yourself using a program like SeaDAS.
Tommy