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Generalized Bayesian cloud detection for satellite imagery. Part 2: Technique and validation for daytime imagery

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Abstract:

Numerical Weather Prediction (NWP) fields are used to assist the detection of cloud in satellite imagery. Simulated observations based on NWP are used within a framework based on Bayes' theorem to calculate a physically-based probability of each pixel with an imaged scene being clear or cloudy. Different thresholds can be set on the probabilities to create application-specific cloud masks. Here, the technique is shown to be suitable for daytime applications over land and sea, using visible and near-infrared imagery, in addition to thermal infrared. We use a validation dataset of difficult cloud detection targets for the Spinning Enhanced Visible and Infrared Imager (SEVIRI) achieving true skill scores of 89% and 73% for ocean and land, respectively using the Bayesian technique, compared to 90% and 70%, respectively for the threshold-based techniques associated with the validation dataset.

Document Type: Research Article

DOI: http://dx.doi.org/10.1080/01431160903051711

Affiliations: 1: School of Geosciences, University of Edinburgh, Edinburgh, UK 2: Satellite Applications, Numerical Weather Prediction, Meteorological Office, Exeter, UK

Publication date: March 1, 2010

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