VOL. 15: The Simulated SeaWiFS Data Set, Version 2.
Citation:
Gregg, W.W., F.S. Patt, and R.H. Woodward, 1993: The Simulated SeaWiFS Data Set,
Version 2. NASA Tech. Memo. 104566, Vol. 15, S.B. Hooker and E.R. Firestone, Eds.,
NASA Goddard Space Flight Center, Greenbelt, Maryland, 42 pp.,
This document describes the second version of the simulated SeaWiFS data set. A
realistic simulated data set is essential for mission readiness preparations and
can potentially assist in all phases of ground support for a future mission.
The second version improves on the first version primarily through additional
realism and complexity. This version incorporates a representation of
virtually every aspect of the flight mission. Thus, it provides a high
fidelity data set for testing several aspects of the ground system, including data
acquisition, data processing, data transfers, calibration and validation,
quality control, and mission operations. The data set is constructed for a
seven-day period, 25--31 March 1994. Specific features of the data set
include Global Area Coverage (GAC), recorded Local Area Coverage (LAC), and
real-time High Resolution Picture Transmission (HRPT) data for the seven-day
period. A realistic orbit, which is propagated using a Brouwer-Lyddane model
with drag, is used to simulate orbit positions. The simulated data corresponds to the
command schedule based on the orbit for this seven-day period. It includes
total (at-satellite) radiances not only for ocean, but for land, clouds, and
ice. The simulation also utilizes a high-resolution land-sea mask. It includes
the April 1993 SeaWiFS spectral responses and sensor saturation
responses. The simulation is formatted according to July 1993 onboard data
structures, which include corresponding telemetry (instrument and spacecraft) data.
The methods are described and some examples of the output are given. The instrument
response functions made available in April 1993 have been used to produce the
Version 2 simulated data. These response functions will change as part of the sensor
improvements initiated in July--August 1993.
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