Google Earth Engine——NOAA气候数据记录（CDR）的气溶胶光学厚度（AOT）是全球每日0.1度的衍生数据的集合，气溶胶产品是由AVHRR图像在白天海洋上空无云条件下生成的。

The NOAA Climate Data Record (CDR) of Aerosol Optical Thickness (AOT) is a collection of global daily 0.1 degree derived data from the PATMOS-x AVHRR level-2b channel 1 (0.63 micron) orbital clear-sky radiance. The aerosol product is generated from AVHRR imagery in cloud-free conditions during daytime over oceans.

Due to the relatively large uncertainties associated with surface reflectance over water glint area and land surface as well as limited AVHRR retrieval channels, this dataset only includes retrieval over non-glint water surface (specifically at the anti-solar side of the orbit with viewing angle more than 40 degree away from the specular ray). For more details, see the Algorithm Description.

Image and data processing by NOAA's National Climatic Data Center.

NOAA气候数据记录（CDR）的气溶胶光学厚度（AOT）是全球每日0.1度的衍生数据的集合，来自PATMOS-x AVHRR level-2b频道1（0.63微米）轨道晴空辐射度。气溶胶产品是由AVHRR图像在白天海洋上空无云条件下生成的。

由于与水面闪光区和陆地表面的表面反射率相关的相对较大的不确定性，以及有限的AVHRR检索通道，这个数据集只包括对非闪光水面的检索（特别是在轨道的反太阳侧，观察角度超过40度，远离镜面射线）。更多的细节，见算法说明。

图像和数据处理由NOAA的国家气候数据中心进行。

Dataset Availability

1981-01-01T00:00:00 - 2021-06-30T00:00:00

Dataset Provider

NOAA

Collection Snippet

ee.ImageCollection("NOAA/CDR/AVHRR/AOT/V3")

Resolution

11132 meters

Bands Table

* = Values are estimated

数据引用：

Zhao, Xuepeng; and NOAA CDR Program (2017): NOAA Climate Data Record (CDR) of AVHRR Daily and Monthly Aerosol Optical Thickness (AOT) over Global Oceans, Version 3.0. [indicate subset used]. NOAA National Centers for Environmental Information. doi:10.7289/V5BZ642P [date accessed].

数据说明：

The NOAA CDR Program’s official distribution point for CDRs is NOAA’s National Climatic Data Center which provides sustained, open access and active data management of the CDR packages and related information in keeping with the United States’ open data policies and practices as described in the President's Memorandum on "Open Data Policy" and pursuant to the Executive Order of May 9, 2013, "Making Open and Machine Readable the New Default for Government Information". In line with these policies, the CDR data sets are nonproprietary, publicly available, and no restrictions are placed upon their use. For more information, see the Fair Use of NOAA's CDR Data Sets, Algorithms and Documentation pdf.代码：

var dataset = ee.ImageCollection('NOAA/CDR/AVHRR/AOT/V3')
                  .filter(ee.Filter.date('2018-02-01', '2018-03-01'));
var aerosolOpticalThickness = dataset.select('aot');
var visParams = {
  min: 0.0,
  max: 0.5,
  palette: ['800080', '0000ff', '00ffff', '008000', 'ffff00', 'ff0000'],
};
Map.setCenter(-88.6, 26.4, 3);
Map.addLayer(
    aerosolOpticalThickness, visParams,
    'Aerosol Optical Thickness');