MODIS Aqua Chlorophyll Product Flags on Worldview

[slkesavunnithan]

Hi,

I am trying to understand the current visualisation adopted by NASA WorldView in displaying the MODIS Aqua L2 Chlorophyll product available here:

https://worldview.earthdata.nasa.gov/?v=147.46599764250465,-28.249779953513993,167.90539911119384,-18.20370037985832&l=Reference_Labels_15m(hidden),Reference_Features_15m(hidden),Coastlines_15m,MODIS_Aqua_L2_Chlorophyll_A,MODIS_Aqua_CorrectedReflectance_Bands721,VIIRS_NOAA21_CorrectedReflectance_TrueColor(hidden),VIIRS_NOAA20_CorrectedReflectance_TrueColor(hidden),VIIRS_SNPP_CorrectedReflectance_TrueColor(hidden),MODIS_Aqua_CorrectedReflectance_TrueColor(hidden),MODIS_Terra_CorrectedReflectance_TrueColor(hidden)&lg=true&t=2023-09-01-T09%3A17%3A12Z

Can someone please help me with the flag structure adopted (basically the settings which cause the no data visualisations) to display this Chlorophyll product?

Thank you
Kesav

[OB General Science - guoqingw]

Hi Kesav,

For level 2 Chlorophyll products, the flags applied are listed on this webpage: https://oceancolor.gsfc.nasa.gov/resources/atbd/ocl2flags/

Guoqing

[slkesavunnithan]

Thank you Guoqing.

I was also wondering where I could find the flag information for the VIIRS products (from Suomi NPP, NOAA 20 and NOAA 21) displayed on this webpage:

https://worldview.earthdata.nasa.gov/?v=146.68474689591284,-37.52545630564113,162.5667687540473,-29.793786613719774&l=Reference_Labels_15m(hidden),Reference_Features_15m(hidden),Coastlines_15m,VIIRS_SNPP_L2_Chlorophyll_A,VIIRS_NOAA21_Chlorophyll_a,VIIRS_NOAA20_Chlorophyll_a,MODIS_Aqua_L2_Chlorophyll_A,MODIS_Aqua_CorrectedReflectance_Bands721(hidden),VIIRS_NOAA21_CorrectedReflectance_TrueColor(hidden),VIIRS_NOAA20_CorrectedReflectance_TrueColor(hidden),VIIRS_SNPP_CorrectedReflectance_TrueColor(hidden),MODIS_Aqua_CorrectedReflectance_TrueColor(hidden),MODIS_Terra_CorrectedReflectance_TrueColor(hidden)&lg=true&t=2025-01-06-T01%3A41%3A50Z

Thank you
Kesav

[OB General Science - guoqingw]

Hi Kesav,

You can download the corresponding L2 files from Earthdata search (https://search.earthdata.nasa.gov/search), and view them in SeaDAS (https://seadas.gsfc.nasa.gov). There is a way to look at which flags were applied to which pixels in SeaDAS (https://www.youtube.com/watch?v=wx08vP2JorA&list=PLf60TttfDm31z76SS4l4neSOAbyjzyQhq).

Let us know if this helps.
Guoqing