Open AccessA Naive Bayesian Cloud-Detection Scheme Derived from CALIPSO and Applied within PATMOS-x
Author(s) -
Andrew K. Heidinger,
Amato T. Evan,
Michael J. Foster,
Andi Walther
Publication year - 2012
Publication title -
journal of applied meteorology and climatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.079
H-Index - 134
eISSN - 1558-8432
pISSN - 1558-8424
DOI - 10.1175/jamc-d-11-02.1
Subject(s) - pathfinder , lidar , environmental science , remote sensing , moderate resolution imaging spectroradiometer , satellite , international satellite cloud climatology project , meteorology , advanced very high resolution radiometer , cloud computing , bayesian probability , arctic , cloud cover , computer science , geology , artificial intelligence , physics , oceanography , astronomy , library science , operating system
The naive Bayesian methodology has been applied to the challenging problem of cloud detection with NOAA’s Advanced Very High Resolution Radiometer (AVHRR). An analysis of collocated NOAA-18 /AVHRR and Cloud–Aerosol Lidar and Infrared Pathfinder Satellite Observations ( CALIPSO )/Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) observations was used to automatically and globally derive the Bayesian classifiers. The resulting algorithm used six Bayesian classifiers computed separately for seven surface types. Relative to CALIPSO , the final results show a probability of correct detection of roughly 90% over water, deserts, and snow-free land; 82% over the Arctic; and below 80% over the Antarctic. This technique is applied within the NOAA Pathfinder Atmosphere’s Extended (PATMOS-x) climate dataset and the Clouds from AVHRR Extended (CLAVR-x) real-time product generation system. Comparisons of the PATMOS-x results with those from International Satellite Cloud Climatology Project (ISCCP) and Moderate Resolution Imaging Spectroradiometer (MODIS) indicate close agreement with zonal mean differences in cloud amount being less than 5% over most zones. Most areas of difference coincided with regions where the Bayesian cloud mask reported elevated uncertainties. The ability to report uncertainties is a critical component of this approach.