Cloud fractions and related parameters

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Cloud fractions and related parameters Michael Grzegorski, Thomas Wagner, Steffen Beierle, Christian Frankenberg, Christoph von Friedeburg, Jens Hollwedel, Stefan Kraus, Sven Kühl, Fahim M. A. Khokhar, Walburga Wilms-Grabe, Suniti Shangavi and Ulrich Platt. e-mail:

CRUSA 16.07.1997

Validation and further development of CRUSA Improvement of CRUSA and comparison with other algorithms. Results: The outcome of CRUSA s iterative fix point method are quite good background (cloud free) images The values of CRUSA over ocean are inaccurate (negative values, if the pixel is cloudless; too high values, if the pixel is cloudy) The problems due to using the HSV-colour space.

Cloud sensitivity of the PMD-channels Investigation was conducted of The three PMD channels (UV, green and red) Sum of red channel and green channel Sum of red, green and uv channel. Maximum of the three channels (HSV-brightness) Red-green interpolation in RGB-colour space Minimum of the three PMD channels Minimum of the red and the green channel.

Iterative fix point method I A iterative fix point method is used to calculate background images: The test was limited to data of 1997. Pre-classification: cloudy pixel are removed through threshold-method. Mean of all images. Cutting of clouds through comparison with the last background picture. Mean of all images. The iteration ends, if there are no more changes of the background picture

Iterative fix point method II We get cloud free pictures for every day: The mean of them is the result of the iteration. For cloud detection the mean of the cloud free pictures of 30 days is used. A reference picture of maximum cloud is calculated in a similar way. Only one picture for the whole year is used.

Comparison: Ocean (18.02.97)

Savannah (18.02.97)

Sahara (16.07.97)

Ocean (16.07.97)

Ukraine, Black Sea (16.07.97)

Rainforest, savannah (16.07.97)

Desert and ocean (16.7.97)

Outlook I Implementation of a new PMD-algorithm to detect fractional cloud cover: We won t use the UV-channel. Improved background iteration: Different iterations for different periods of the year using the whole GOME-Data. Higher spatial resolution

Outlook II Improved calculation of maximum cloud further investigation: determination of maximum depends only on solar zenith angle? Quality of maximum cloud data depends strongly on the size of the used dataset. Calculation of cloud top height evaluation of O 4 (630 nm), new cloud fractions and radiation transfer modelling.

The satellite group Heidelberg: Thomas Wagner, Steffen Beirle, Nicolas Dross, Christian Frankenberg, Christoph von Friedeburg, Michael Grzegorski, Jens Hollwedel, Muhammad Fahim Khokhar, Stefan Kraus, Sven Kühl, Suniti Shangavi, Mark Wenig, Walburga Wilms-Grabe, Ulrich Platt

ADD-ONs

HSV and RGB colour space

CRUSA iteration

CRUSA interpolation

CRUSA 18.02.1997