Table of Contents

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I. Introduction

A short introduction to this module is given in this chapter.

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II. AVHRR Night Microphysics RGB

This nighttime RGB was designed and tuned to monitor nighttime fog / low stratus. Other (secondary) applications are cloud classification in general and the detection of low-level moisture boundaries and dust clouds.

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III. METOP AVHRR Day Microphysics RGB

This daytime RGB type was designed for monitoring clouds. It provides information on cloud optical thickness, cloud top temperature and microphysics. It is the best for cloud analysis for both scientific and forecast applications. It provides a pronounced color contrast between different cloud types and surface objects.

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IV. AVHRR Natural Colour RGB

This daytime RGB provides information on cloud optical thickness and phase in cloudy areas and on green vegetation content in cloud- and snow-free areas. It is a good tool for monitoring fog/low level water clouds over snow. It distinguishes snow-free land from snow-covered land and snow cover from fog/low clouds. Vegetation and bare soil have a good color contrast.

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V. AVHRR Cloud RGB

This 'traditional' RGB is useful for high clouds. Thick and thin high-level clouds (e.g. the storm core and anvil) are easy to discern. It provides vegetation information in cloud- and snow-free areas.

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VI. Main features of daytime AVHRR RGBs

The three daytime RGB types are compared.

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VII. Effects of the scanning geometry

The effects of the scanning geometry are discussed

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VIII. Summary

A short summary is given.

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