MODIS
Moderate Resolution Imaging Spectroradiometer. A sensor aboard NASA's Terra and Aqua satellites providing daily global coverage in 36 spectral bands at 250m-1km resolution. Widely used for monitoring vegetation, ocean color, atmospheric aerosols, and fire detection at continental scales.
Overview
The Moderate Resolution Imaging Spectroradiometer (MODIS) is a key instrument aboard NASA's Terra and Aqua satellites, providing comprehensive global Earth observation data since 1999. MODIS captures data across 36 spectral bands ranging from 0.4 to 14.4 micrometers, at spatial resolutions of 250 m, 500 m, and 1 km. With a 2,330 km swath width, MODIS images the entire Earth every one to two days. Terra MODIS (launched December 1999) crosses the equator at 10:30 a.m. local time, while Aqua MODIS (launched May 2002) crosses at 1:30 p.m., together capturing diurnal variation.
How It Works
MODIS uses a cross-track scanning mirror sweeping a 110-degree field of view, projecting light onto four detector assemblies covering visible, NIR, SWIR, and thermal infrared. Its 36 bands are purpose-designed: two at 250 m for vegetation (red and NIR), five at 500 m for land and cloud characterization, and twenty-nine at 1 km covering ocean color, atmospheric water vapor, surface temperature, and cirrus clouds. All data are recorded at 12-bit radiometric sensitivity.
Key Facts
- 36 spectral bands covering 0.4–14.4 µm at 250 m, 500 m, and 1 km resolution.
- Over 25 years of continuous global data — one of the longest consistent satellite records.
- Terra crosses at 10:30 a.m.; Aqua at 1:30 p.m. — capturing diurnal variation.
- 2,330 km swath width provides near-daily global coverage.
- Produces over 40 standard data products covering land, ocean, and atmosphere.
- VIIRS on Suomi NPP and NOAA-20/21 is the designated successor ensuring data continuity.
Applications
Vegetation and Ecosystem Monitoring
MOD13 provides NDVI and EVI composites at 16-day intervals and 250 m resolution, tracking seasonal phenology, drought stress, and agricultural productivity.
Land Surface Temperature
MOD11 delivers daily LST estimates at 1 km using a split-window algorithm, supporting urban heat island studies and evapotranspiration modeling.
Fire Detection
MODIS thermal bands detect active fires in near-real-time (MOD14) and map burned area (MCD64A1), providing critical data for fire management agencies globally.
Ocean Color and Productivity
Ocean color bands measure chlorophyll-a concentration and primary productivity, supporting fisheries management and marine ecosystem research.
Atmosphere and Aerosols
MOD35 cloud mask and MOD04 aerosol products feed into weather forecasting, air quality monitoring, and climate modeling.
Limitations & Considerations
MODIS 250 m–1 km resolution is insufficient for field-level analysis where Sentinel-2 (10–20 m) is preferred. Cloud contamination requires multi-day compositing. Both Terra and Aqua have exceeded their six-year design lifetimes, and orbital drift on Terra has shifted its crossing time, complicating long-term trend analysis. The broad swath introduces significant pixel distortion at scan edges.
History & Background
MODIS was conceived in the late 1980s as part of NASA's Earth Observing System (EOS). Terra launched December 18, 1999; Aqua followed May 4, 2002. Built by Raytheon Santa Barbara Remote Sensing, MODIS became arguably the most cited satellite instrument in Earth science, generating an archive used in thousands of publications. NASA launched Suomi NPP in 2011 carrying VIIRS to continue key MODIS records.
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