Google Earth Engine——NOAA气候数据记录（CDR）的AVHRR表面反射率包含网格化的每日表面反射率和亮度温度，来自NOAA七颗极地轨道卫星上的高级甚高分辨率辐射计（AVHRR）

The NOAA Climate Data Record (CDR) of AVHRR Surface Reflectance contains gridded daily surface reflectance and brightness temperatures derived from the Advanced Very High Resolution Radiometer (AVHRR) sensors onboard seven NOAA polar orbiting satellites. The data are gridded at a resolution of 0.05° and computed globally over land surfaces.

Known issues with this dataset include:

• TIMEOFDAY variable contains values that are too large by 1 day

• Latitude values are not correctly associated with the center of the grid cell, error is < 0.002 degrees

• Longitude values are not correctly associated with the center of the grid cell, error is < 0.02 degrees

See technical note from the data provider.

NOAA气候数据记录（CDR）的AVHRR表面反射率包含网格化的每日表面反射率和亮度温度，来自NOAA七颗极地轨道卫星上的高级甚高分辨率辐射计（AVHRR）传感器。这些数据以0.05°的分辨率进行网格化处理，在全球范围内对陆地表面进行计算。

这个数据集的已知问题包括。

TIMEOFDAY变量包含的数值大了1天。

纬度值与网格单元中心的关联不正确，误差<0.002度

经度值与网格单元的中心没有正确关联，误差<0.02度

见数据提供者的技术说明。

Dataset Availability

1981-06-24T00:00:00 - 2019-05-16T00:00:00

Dataset Provider

NOAA

Collection Snippet

ee.ImageCollection("NOAA/CDR/AVHRR/SR/V4")

Resolution

5566 meters

Bands Table

Name	Description	Min*	Max*	Units	Wavelength	Scale
SREFL_CH1	Bidirectional surface reflectance	1	10000		640nm	0.0001
SREFL_CH2	Bidirectional surface reflectance	1	10000		860nm	0.0001
SREFL_CH3	Bidirectional surface reflectance	-32768	32767		3.75μm	0.0001
BT_CH3	Brightness temperature	-32519	30136	K	3.75μm	0.1
BT_CH4	Brightness temperature	-32519	31450	K	11.0μm	0.1
BT_CH5	Brightness temperature	-7623	18788	K	12.0μm	0.1
TIMEOFDAY	Hours since start of day	0	2399	hours		0.01
RELAZ	Relative sensor azimuth angle	-32768	32767	Degrees		0.01
SZEN	Solar zenith angle	219	8546	Degrees		0.01
VZEN	View zenith angle, scale 0.01	0	6936	Degrees		0.01
QA	Quality control bit flags					0
QA Bitmask	Bit 0: Unused 0: No 1: Yes Bit 1: Pixel is cloudy 0: No 1: Yes Bit 2: Pixel contains cloud shadow 0: No 1: Yes Bit 3: Pixel is over water 0: No 1: Yes Bit 4: Pixel is over sunglint 0: No 1: Yes Bit 5: Pixel is over dense dark vegetation 0: No 1: Yes Bit 6: Pixel is at night (high solar zenith) 0: No 1: Yes Bit 7: Channels 1-5 are valid 0: No 1: Yes Bit 8: Channel 1 value is invalid 0: No 1: Yes Bit 9: Channel 2 value is invalid 0: No 1: Yes Bit 10: Channel 3 value is invalid 0: No 1: Yes Bit 11: Channel 4 value is invalid 0: No 1: Yes Bit 12: Channel 5 value is invalid 0: No 1: Yes Bit 13: RHO3 value is invalid 0: No 1: Yes Bit 14: BRDF correction is invalid 0: No 1: Yes Bit 15: Polar flag, latitude over 60 degrees (land) or 50 degrees (ocean) 0: No 1: Yes

* = Values are estimated

影像属性：

Name	Type	Description
status	String	'provisional' or 'permanent'

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.

引用：

Eric Vermote, Chris Justice, Ivan Csiszar, Jeff Eidenshink, Ranga Myneni, Frederic Baret, Ed Masuoka, Robert Wolfe, Martin Claverie and NOAA CDR Program (2014): NOAA Climate Data Record (CDR) of AVHRR Surface Reflectance, Version 4. [indicate subset used]. NOAA National Climatic Data Center.NOAA Climate Data Record (CDR) of AVHRR Surface Reflectance, Version 4 (Version Superseded)

代码：

var dataset = ee.ImageCollection('NOAA/CDR/AVHRR/SR/V4')
                  .filter(ee.Filter.date('2018-05-01', '2018-06-01'));
var surfaceReflectance = dataset.select('SREFL_CH1');
var surfaceReflectanceVis = {
  min: -1000.0,
  max: 9000.0,
  palette: ['003b02', '006a03', '008d05', '01be07', '01ff09', 'ffffff'],
};
Map.setCenter(52.48, 71.72, 0);
Map.addLayer(surfaceReflectance, surfaceReflectanceVis, 'Surface Reflectance');

Dataset Availability

1981-06-24T00:00:00 - 2021-09-28T00:00:00

Dataset Provider

NOAA

Collection Snippet

ee.ImageCollection("NOAA/CDR/AVHRR/SR/V5")

 代码：

var dataset = ee.ImageCollection('NOAA/CDR/AVHRR/SR/V5')
                  .filter(ee.Filter.date('2018-05-01', '2018-06-01'));
var surfaceReflectance = dataset.select('SREFL_CH1');
var surfaceReflectanceVis = {
  min: -1000.0,
  max: 9000.0,
  palette: ['003b02', '006a03', '008d05', '01be07', '01ff09', 'ffffff'],
};
Map.setCenter(52.48, 71.72, 1);
Map.addLayer(surfaceReflectance, surfaceReflectanceVis, 'Surface Reflectance');