Why is the center point 0.00° latitude and longitude for all data granules?
• How does GLAS geolocate data and provide off-nadir pointing? Analysis of altimetric data acquired by the GLAS instrument requires accurate determination of the laser spot location on the Earth’s surface (ice, land, water, clouds) or geolocation of the laser spot. The spot location with respect to the Earth’s center of mass (geocenter) is determined by both the orbital location of GLAS in an appropriate reference frame and the direction of the laser beam described in the same reference frame. With these two position vectors, the location of the laser spot can be inferred in typical geodetic coordinates (geodetic latitude, longitude, and height above a reference ellipsoid) using a Terrestrial Reference Frame whose origin is coincident with the center of mass of the Earth. The nominal laser pointing direction is the geodetic nadir (perpendicular to a surface defined by an ellipsoidal model of the Earth), but off-nadir pointing up to 5° is a requirement. ICESat’s normal mission consists
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