Pointing parameters:
GCI_POSITION
Spacecraft position vector (km) in GCI coordinates.
ATTITUDE
The (normalized) spacecraft attitude vector in GCI coordinates. This is a vector pointing along the spacecraft spin axis and corresponds to the 'up' direction in UVI images.
GCI_SUN
Sun position vector in GCI coordinates.
GCI_LOOK_DIR
A normalized vector in GCI coordinates pointing along the center of the UVI field of view.
DSP_ANGLE
Nadir offset angle of the despun pointing platform in degrees. Positive offset is in a direction _opposite_ to the spacecraft rotation.
GEODETIC_LAT
GEODETIC_LON
For each pixel in the image data, pointing information is calculated in the form of geodetic latitude and longitude. These are written to two output images: latitude and longitude, respectively. To save space only a subset of the pixels is written to the UVI Key Parameter file. The pointing data images are sparse matrices representing every 10 pixels of the image data.
Image Data:
IMAGE_DATA
This is the requested image data. The image is background subtracted and calibrated to radiance values (photon cm^-2 cm^-1). The data is a rectangular two-dimensional array (228 rows x 200 columns). Only a circular region of the rectangular array contains valid image data. The corners of the image (non-valid image data) are filled with a fixed fill value (CORNER_FILL = -127).
Back to Key Parameters
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