--Online Help--

Index

1 About archived images
  1.1 What is the "All Weather Ocean Wind Speed ?"
2 Usage of this page
  2.1 Top page
  2.2 Path map of the ocean wind(clickable map)
  2.3 Detail images of the ocean wind
3 Acknowledgment

1. About archived images

1.1 What is the "All Weather Ocean Wind Speed ?"

  The archived ocean wind is retrieved by SSW algorithm, which is not applied to standard products of AMSR/AMSR-E. By using 6GHz and 10GHz data, the new SSW algorithm can retrieve wind speed in good level even under strong wind, heavy rain conditions, such as within typhoon areas.
  Usually, the higher frequency can not be used in rain areas. The 6GHz and 10GHz of Windsat are not so effected by rain, which enable us to retrieve SSW in good level inside typhoon areas. We call the ocean wind of this page as "All Weather Ocean Wind Speed."

2. Usage of this page

2.1 Top Page

  The top page of "All Weather Ocean Wind Speed" is shown in Fig.1. The upper part is a selector of the images, for example, sensor, observation date, orbit direction and so forth. The lower part is the image of the ocean wind whose condition is the result of upper part. This image is a clickable map, which we can see enlarge images of the target regions by clicking a designed area. The latest image and its conditions will be shown inside this page, when you will open the page at the first time by your browser.

Fig.1  Top page

2.2 Path map of the ocean wind(clickable map)

  The image of the ocean wind is shown in Fig.2. The enlarged image of the region you click will be shown in new window.

Fig.2 Path map of the ocean wind(clickable map)
  The path map images are made of 25Km grid data. The numbers printed in the image represent path number. The images of the ocean wind are made as a clickable map. The enlarged images of the region you click will be shown in new window.   

2.3 Detail images of the ocean wind

  The Fig.3 shows the enlarged image of the ocean wind from the selected region in the path map. The enlarged images are made of 10Km grid data. At the top of the image, some useful information is shown, such as the statistic data of the ocean wind, as well as the observation date time, sensor/platform, and so forth.
  The "Ave.Max" represents averaged value of the largest one in the region. The "point" means the number of points for calculating the "Ave.Max." The typical typhoon area is thought to be about 100Km X 100Km (nearly equal to "point=100."). Therefore, the "Ave.Max" represents the averaged wind speed of the typhoon area.

Fig.3 Enlarged images of the ocean wind
  The enlarged images, which are obtained by clicking the path map, are made of 10Km grid data. At the top of the image, some useful information is shown, such as the statistic data of the ocean wind, as well as the observation date time, sensor/platform, and so forth.

3. Acknowledgment

The WindSat instrument is a spaceborne polarimetric microwave radiometer launched by the Naval Research Laboratory (NRL) under the sponsorship of the U.S. Navy and NPOESS in 2003. The Sensor Data Record (SDR) brightness temperatures are used for the All Weather Ocean Wind Speed processing. SDR dataset are being made available by NRL and NOAA's National Environmental Satellite, Data, and Information Service (NESDIS).




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Earth Observation Research and application Center, Japan Aerospace Exploration Agency.
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