I know the orbital difference between both satellites. But for Chlorophyll a estimation, which is best MODIS TERRA AND MODIS AQUA. Because most of research studies i have come across utilizing MODIS AQUA OVER MODIS TERRA . WHY?
Hello,
As far as I know, the only significant difference is that MODIS onboard on Aqua provide more recent information. Also, Terra crosses the equatorial line at approximately 10:30am, and Aqua crosses the equatorial line at 1:30pm. Nevertheless the MODIS is the same instrument. Additionally, you can see intercomparisons and an evaluation methodology in this interseting link:
http://earth.esa.int/workshops/ivos05/pres/19_xiong.pdf
It looks like different algorithms are used to generate chlorophyll a products.
Check this link for more information:
http://oceancolor.gsfc.nasa.gov/forum/oceancolor/topic_show.pl?tid=78
Hi folks,
I think It depends on what you mean by "ocean color". Some bands in MODIS-T have degraded in time, and consequently, some derived products are not the best (e.g. Chla) as compared to MODIS-A. Other bands are not that bad so, at the end, it depends on which bands you are interested in.
Check this out: http://oceancolor.gsfc.nasa.gov/DOCS/Publications/franz_et_al_2007_spie.pdf
Cheers!
@Stavros Kolios @Bassil El-Masri @Gonzalo S. Saldías: Thank you all for your inputs. From the information, i understood that MODIS AQUA products are better choice for Chl a estimation compared to MODIS TERRA.
Aloha all,
Please look at these documents:
Ocean Color - MODIS-Terra Ocean Color Reprocessing 2014.0 - Global mean deep-water
http://oceancolor.gsfc.nasa.gov/cms/reprocessing/OCReproc20140MT.html
Compare multiple sensors between coastal and open ocean:
Comparative Analysis of Chlorophyll-a Distribution from SeaWiFS, MODIS-Aqua, MODIS-Terra and MERIS in the Arabian Sea
http://www.tandfonline.com/doi/abs/10.1080/01490419.2014.914990
Hope this help,
Mahalo,
Roberto
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