Share Email Print

Proceedings Paper

Introducing spatial information in k-means algorithm for cloud detection in optical satellite images
Author(s): Laurent Beaudoin; Jean-Marie Nicolas; Florence Tupin; M. Hueckel
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper Abstract

Due to restricted visibility time of remote sensing polar platforms from earth reception station, on ly a limited number of images can be transmitted. On the case of optical images, an in- board cloud cover detection module will allow to transmit only useful images. In order to derive such a module, we propose a method to detect cloudy areas from subsampled images. For a pixel ground surface of about 110 by 100 m2, cloudy areas appear as the highest radiometric value homogeneous areas. The algorithm presented in this paper is based on the k-means Method. Its main originality is to improve classical results by introducing isotropic spatial information. Input data are the sorted components of a vector composed of radiometric values for each pixel and its neighbors. Then a classical k-means method with constraints on the cloudy class gravity center is used on these vectors. We tested the method on a set of 206 subsampled SPOT XS and 138 SPOT P images and their manmade interpretation masks. To evaluate the quality of our results, we used the probability of false alarm (PFA) depending on the number of pixels which have been wrongly declared cloudy. We obtained rather good PFA and PND, and compared these values with result obtained with other methods.

Paper Details

Date Published: 31 January 2001
PDF: 11 pages
Proc. SPIE 4168, Remote Sensing of Clouds and the Atmosphere V, (31 January 2001); doi: 10.1117/12.413845
Show Author Affiliations
Laurent Beaudoin, Matra Systems and Information and Ecole Nationale Superieure des Telecommunications (France)
Jean-Marie Nicolas, Ecole Nationale Superieure des Telecommunications (France)
Florence Tupin, Ecole Nationale Superieure des Telecommunications (France)
M. Hueckel, Matra Systems and Information (France)

Published in SPIE Proceedings Vol. 4168:
Remote Sensing of Clouds and the Atmosphere V
Jaqueline E. Russell; Klaus Schaefer; Olga Lado-Bordowsky, Editor(s)

© SPIE. Terms of Use
Back to Top