ひまわり雲画像解析の一方法 一雲系特徴量を用いた雲種判別一

抄録

Provided assumption that sea-state conditions, weather-maps and wave-charts are closely related in time and space, sea-state conditions may be available without using results of the direct measurements of ocean waves. For this purpose, analysis using information by satellite remote-sensing, weather maps and wave charts are carried out. After the time and spetial correlation analyses, sea-state conditions will be able to be understood/predicted from the analyzed results of cloud system through the relations with weather maps.

As the first step, this paper introduces a method for analyzing information from satellite remote-sensing. Using remotely sensed visible (VIS) and infrared (IR) images from "GMS" (Geostationaly Meteorological Satellite), cloud-systems are extracted. Considering that two main cloud-systems, the Stratus (St) and Cumulus (Cu), are closely related to the height, thickness, edge-slope and complexity of cloud-system, they develop a method to discriminate these two cloud-systems.

The area of cloud-system is obtained by determining threshold brightness temperature using VIS and IR images. They show that the proposed method is quite useful to discriminate cloud-systems, because that it can indicate the possibility of Stratus and Cumulus for each cloud-system.