Experiments In Automatic Cloud Tracking Using SMS-GOES Data

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Abstract
A description is given of the component parts of a computer system for automatically tracking clouds shown by sequences of pictures obtained by geostationary weather satellites. The component programs perform the following functions: separation of clouds from background; subdivision of the cloud data into groups (which are potential tracers); computation of the location, size, brightness and infrared values of each group: matching groups at two different times to give cloud motion vectors;and conversion of motions from the row and column coordinates of recorded data to earth coordinates. In this paper, the emphasis is on the automatic grouping and tracking functions. Some recent tests of the method are described and illustrated. These tests used SMS-GOES data in both visible and infrared channels for several different types of clouds, including low clouds, convective clouds and cirrus. Using 4 mi resolution data at one-half hour intervals, and with no initial information about the expected motion... Abstract A description is given of the component parts of a computer system for automatically tracking clouds shown by sequences of pictures obtained by geostationary weather satellites. The component programs perform the following functions: separation of clouds from background; subdivision of the cloud data into groups (which are potential tracers); computation of the location, size, brightness and infrared values of each group: matching groups at two different times to give cloud motion vectors;and conversion of motions from the row and column coordinates of recorded data to earth coordinates. In this paper, the emphasis is on the automatic grouping and tracking functions. Some recent tests of the method are described and illustrated. These tests used SMS-GOES data in both visible and infrared channels for several different types of clouds, including low clouds, convective clouds and cirrus. Using 4 mi resolution data at one-half hour intervals, and with no initial information about the expected motion...

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