![]() ![]() However, due to the changing polarization sensitivities in MODIS Terra (MODIST), the Terra ocean products have been relying on Ocean Biology Processing Group (OBPG) crosscalibration to correct the temporal calibration biases. Since they began operations, both instruments have continuously provided global earth observation data to study land, ocean, and atmospheric processes. Terra is on a descending node with an equator crossing time of 10:30 AM (local time) and Aqua is on an ascending node with a 1:30 PM equator crossing time. The two EOS spacecrafts, Terra and Aqua, were launched on 18 December 1999 and, respectively, into sun-synchronous polar orbits at an altitude of 705 km. ![]() The MODIS is a key instrument aboard the Terra and Aqua Satellites. ![]() Within the RSB, bands 8–16 are optimized to observe ocean biological processes (Table 1) and the rest of the RSB are designed for land and atmosphere applications but can also be used in ocean science application with reduced accuracy. Of the 36 spectral bands, 20 are reflective solar bands (RSB) with a spectral range of 0.41 to 2.1 μm. The Moderate Resolution Imaging Spectroradiometer (MODIS) on the Earth Observing System (EOS) platform has 36 spectral bands to provide near-global observations every 2 days.
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