Global Ultraviolet Imager (GUVI) Data from the Thermosphere, Ionosphere, Mesosphere Energetics and Dynamics (TIMED) Mission

The data are gridded into a GUVI based coordinate system consisting of the along orbit position of the sensor and the angle of the scan from the nadir position. This gridding eliminates overlap from scan to scan due to the large instantaneous field-of-view of GUVI (about 12 degrees) and involves coaddition to place the values on a uniform instrument shared grid. The data is then determined whether its from day, night, aurora or twilight pixels.

The Level 2B data products contain environmental parameters which are derived from the sensor data by scientific algorithms specific to day, night, and auroral regions. The data is averaged into 100 x 100 km2 resolution to form "super pixels" on the day and night and 25 x 25 km2 for the auroral products. The "super pixels" are then processed by the algorithms to yield geophysical parameters which are calculated from the radiance of the different colors.

The GUVI data product files are stored in full orbit increments according to the date and revolution number and data product level type. These files are in NetCDF which is a self describing platform independent binary format. See guvi.jhuapl.edu/data/understanding.shtml