NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Cloud screening Coastal Zone Color Scanner images using channel 5Clouds are removed from Coastal Zone Color Scanner (CZCS) data using channel 5. Instrumentation problems require pre-processing of channel 5 before an intelligent cloud-screening algorithm can be used. For example, at intervals of about 16 lines, the sensor records anomalously low radiances. Moreover, the calibration equation yields negative radiances when the sensor records zero counts, and pixels corrupted by electronic overshoot must also be excluded. The remaining pixels may then be used in conjunction with the procedure of Simpson and Humphrey to determine the CZCS cloud mask. These results plus in situ observations of phytoplankton pigment concentration show that pre-processing and proper cloud-screening of CZCS data are necessary for accurate satellite-derived pigment concentrations. This is especially true in the coastal margins, where pigment content is high and image distortion associated with electronic overshoot is also present. The pre-processing algorithm is critical to obtaining accurate global estimates of pigment from spacecraft data.
Document ID
19920029614
Document Type
Reprint (Version printed in journal)
Authors
Eckstein, B. A. (California Univ. La Jolla, CA, United States)
Simpson, J. J. (California, University La Jolla, United States)
Date Acquired
August 15, 2013
Publication Date
November 1, 1991
Publication Information
Publication: International Journal of Remote Sensing
Volume: 12
ISSN: 0143-1161
Subject Category
OCEANOGRAPHY
Distribution Limits
Public
Copyright
Other