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High-resolution Landsat thematic mapper image data were employed in the present study to estimate the influence of regional wind systems on the macrophysical properties of cumulus clouds, such as perimeter fractal dimension, orientation angle, and cloud-base height. As a case study, an image of cumulus clouds was chosen in which small- and large-sized clouds prevail over the land in the presence of local winds. Cloud extraction from backgrounds becomes difficult when the background comprises various brightnesses. Furthermore, the surface brightness of a cloud is not uniform when shadows appear on the surface. These effects contribute to errors in cloud extraction only using a simple threshold. To address these problems, technical improvements in processing, including the combination of clustering, dynamic threshold, and edge detection, are presented and shown to produce more accurate cloud outlines seen from the zenith direction. The clouds’ statistical area–perimeter relation was shown to confir...

A Fractal Dimensional Analysis on the Cloud Shape Parameters of Cumulus over Land