Terra Product Descriptions: MODMGGAD

Last update: February 9 2015

Data Set Short Name:
MODMGGAD

Data Set Long Name:
MODIS/Terra Geolocation Angles Daily L2G Global 1km SIN Grid Day

Platform:
Terra

Instrument:
MODIS

Product Description:
The MODIS Near Real Time (NRT) Global Geolocation Angle (MODMGGAD) files contain information on solar illumination and instrument viewing geometry angles. These data can be used to model the geometric relationship and distance between the area of the Earths surface imaged the sun and the sensor. This is often required to perform atmospheric corrections or to convert or calibrate spectral data to known absolute radiance or reflectance units.
MODMGGAD files are used as input to higher-level products such as MODIS Surface Reflectance (MOD09). Geometric information for each sensor observation is stored on a geolocated grid with Level-2 geophysical parameters stored as Level-2G gridded products. The multiple observations stored in the L2G grids are examined by the Level-3 processes to extract only the most relevant observations per grid cell.

Production Frequency:
~364 file per day

Spatial Coverage:
Global

Spatial Resolution:
1km

File Size (MB):
~90.0

Citation:

Dataset Originator/Creator:
MODIS Land Science Team/MODIS Adaptive Processing System (MODAPS)

Data Authors:

Dataset DOI:
http://dx.doi.org/10.5067/MODIS/MODMGGAD.NRT.006