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A new method is presented for the determination of cloud top heights using the footage ofa time-lapse camera that is placed above a frequently occurring cloud layerin a mountain valley. Contact points between cloud tops andunderlying terrain are automatically detected in the camera image based ondifferences in the brightness, texture and movement of cloudy and non-cloudyareas. The height of the detected cloud top positions is determined bycomparison with a digital elevation model projected to the view of thecamera. The technique has been validated using data about the cloud immersionof a second camera as well as via visual assessment. The validation shows ahigh detection quality, especially regarding the requirements for thevalidation of satellite cloud top retrieval algorithms

Automatic cloud top height determination in mountainous areas using a cost-effective time-lapse camera system