Aqua MODIS Ocean Color Granules during Hurricane Katrina

  • Released Wednesday, April 12, 2006

The Aqua satellite orbits the Earth every 99 minutes in a polar, sun-synchronous orbit. The MODIS instrument on Aqua observes reflected light from the Earth in 36 spectral frequencies. These observations can be processed to show many properties of the Earth's surface, from temperature and phytoplankton measurements near the surface of the ocean to fire occurrences and land cover characteristics on the land surface.
The MODIS observations start out divided into 5-minute sections called granules, and this animation shows MODIS ocean color data from about 4 days of individual Aqua granules. Ocean color is a measurement of the amount of chlorophyll in ocean phytoplankton and is therefore a direct measurement of the amount of life in the ocean. It can only be measured in ocean regions that are free of both clouds and sun glint, the bright band of specular reflection in the center of each granule.

Legend for the ocean color measurements.

Legend for the ocean color measurements.

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Please give credit for this item to:
NASA/Goddard Space Flight Center Scientific Visualization Studio

Release date

This page was originally published on Wednesday, April 12, 2006.
This page was last updated on Wednesday, May 3, 2023 at 1:55 PM EDT.

Datasets used in this visualization

Note: While we identify the data sets used in these visualizations, we do not store any further details, nor the data sets themselves on our site.