NOAA CDR AVHRR: Surface Reflectance, Version 4

NOAA/CDR/AVHRR/SR/V4
Dataset Availability
1981-06-24T00:00:00 - Present
Dataset Provider
Earth Engine Snippet
ee.ImageCollection("NOAA/CDR/AVHRR/SR/V4")
Tags
land daily sr reflectance noaa cdr avhrr

Description

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.

Bands

Resolution
0.05 arc degrees

Bands

Name Units Min Max Scale Wavelength Description
SREFL_CH1 1* 10000* 0.0001 640nm

Bidirectional surface reflectance

SREFL_CH2 1* 10000* 0.0001 860nm

Bidirectional surface reflectance

SREFL_CH3 -32768* 32767* 0.0001 3.75μm

Bidirectional surface reflectance

BT_CH3 K -32519* 30136* 0.1 3.75μm

Brightness temperature

BT_CH4 K -32519* 31450* 0.1 11.0μm

Brightness temperature

BT_CH5 K -7623* 18788* 0.1 12.0μm

Brightness temperature

TIMEOFDAY hours 0* 2399* 0.01

Hours since start of day

RELAZ Degrees -32768* 32767* 0.01

Relative sensor azimuth angle

SZEN Degrees 219* 8546* 0.01

Solar zenith angle

VZEN Degrees 0* 6936* 0.01

View zenith angle, scale 0.01

QA

Quality control bit flags

* estimated min or max value

Image Properties

Image Properties

Name Type Description
status STRING

'provisional' or 'permanent'

Terms of Use

Terms of Use

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.

Citations

Citations:
  • 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.

DOI(s)

Explore in Earth Engine

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');

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