Moderate Resolution Imaging Spectroradiometer
|Within Vocab||SeaVoX Device Catalogue|
|Definition||The Moderate Resolution Imaging Spectroradiometer (MODIS) is an optical spectroradiometer that acquires photo-radometric data of terrestrial, oceanic and lower atmospheric environments for the study of global dynamics. Incoming radiation is directed by a continuously rotating double-sided scan mirror, scanning from -50 to +50 degrees. It directs radiation into a two-mirror off-axis afocal telescope. A dichroic beam splitter then splits the radiation into four optical objective and focal plane assemblies. There are separate assemblies for both near infrared (short and long-wave) and visible spectral bands. These are further split into 36 spectral bands ranging in wavelength from 0.4 to 14.4 micrometres. Bands 1-2 are imaged at a nominal spatial resolution of 250 m at nadir, with bands 3-7 at 500 m and the remaining bands (8-36) at 1 km. The MODIS instrument has a cross track scan rate of 20.3 rpm, and measures radiation in 36 optical bands (bands 1-19 are in nanometres and bands 20-36 are in micrometres): 620-670 nm; 841-876 nm; 459-479 nm; 545-565 nm; 1230-1250 nm; 1628-1652 nm; 2105-2155 nm; 405-420 nm; 438-448 nm; 483-493 nm; 526-536 nm; 546-556 nm; 662-672 nm; 673-683 nm; 743-753 nm; 862-877 nm; 890-920 nm; 931-941 nm; 915-965 nm; 3.660-3.840 micrometres; 3.929-3.989 micrometres; 3.929-3.989 micrometres; 4.020-4.080 micrometres; 4.433-4.498 micrometres; 4.482-4.549 micrometres; 1.360-1.390 micrometres; 6.535-6.895 micrometres; 7.175-7.475 micrometres; 8.400-8.700 micrometres; 9.580-9.880 micrometres; 10.780-11.280 micrometres; 13.185-13.485 micrometres; 13.485-13.785 micrometres; 13.785-14.085 micrometres; 14.085-14.385 micrometres. Flown on Terra, Aqua. http://modis.gsfc.nasa.gov/about/|
|Has Current Version||3|
|Version||1 , 2|
|L05 SeaDataNet device categories - (2)|
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