NOAA CDR PATMOSX: Cloud Properties, Reflectance, and Brightness Temperatures, Version 5.3

Page Summary

• This dataset offers high-quality Climate Data Records (CDR) of cloud properties, brightness temperatures, and reflectances derived from AVHRR PATMOS-x.

• The data, available daily from 1979 to 2022, is gridded to a 0.1 x 0.1 equal angle grid.

• The dataset includes 48 bands, with 11 designated as CDR quality variables.

• Cloud products are generated using the ACHA and DCOMP algorithms, with detailed documentation available.

• The data is nonproprietary and publicly available for use without restrictions, in line with US open data policies.

Dataset Availability

1979-01-01T00:00:00Z–2022-01-01T00:00:00Z

Dataset Producer

NOAA

Earth Engine Snippet

ee.ImageCollection("NOAA/CDR/PATMOSX/V53")

Cadence

1 Day

Tags

atmospheric avhrr brightness cdr climate cloud noaa optical reflectance temperature

metop

poes

Description

This dataset provides high quality Climate Data Record (CDR) of multiple cloud properties along with Advanced Very High Resolution Radiometer (AVHRR) Pathfinder Atmospheres Extended (PATMOS-x) brightness temperatures and reflectances. These data have been fitted to a 0.1 x 0.1 equal angle-grid with both ascending and descending assets generated daily from two to ten NOAA and MetOp satellite passes per day.

This dataset includes 48 bands, 11 of which are deemed CDR quality (marked with "CDR variable" in the band list). The cloud products are derived using the ABI (Advanced Baseline Imager) Cloud Height Algorithm (ACHA), and the Daytime Cloud Optical Properties (DCOMP) algorithm. For more detail on the processing see the Climate Algorithm Theoretical Basis Document (C-ATBD).

Bands

Bands

Pixel size: 11132 meters (all bands)

Name	Units	Min	Max	Scale	Offset	Pixel Size	Wavelength	Description
cld_emiss_acha		-127*	127*	0.00393701	0.5	11132 meters	11µm	Cloud emissivity at 11µm, determined from ACHA (CDR variable)
cld_height_acha	km	-32767*	32767*	0.000305185	10	11132 meters	None	Cloud height computed using ACHA
cld_height_uncer_acha	km	-127*	127*	0.0393701	5	11132 meters	None	Cloud height uncertainty computed using ACHA
cld_opd_acha		-127*	127*	0.0322835	3.9	11132 meters	0.65µm	Cloud optical depth at 0.65µm, determined from ACHA
cld_opd_dcomp		-32685*	32149*	0.00244453	79.9	11132 meters	0.65µm	Cloud optical depth at 0.65µm, determined from DCOMP (CDR variable)
cld_opd_dcomp_unc		-32685*	-32276*	0.00244453	79.9	11132 meters	None	Uncertainty in the cloud optical depth at 0.65µm, determined from DCOMP
cld_press_acha	hPa	-32767*	32767*	0.0167852	550	11132 meters	None	Cloud-top pressure computed using ACHA
cld_reff_acha	µm	-127*	127*	0.629921	80	11132 meters	None	Effective radius of cloud particles determined from ACHA
cld_reff_dcomp	µm	-32767*	32767*	0.00244148	80	11132 meters	None	Effective radius of cloud particles determined from DCOMP (CDR variable)
cld_reff_dcomp_unc	µm	-32767*	-32357*	0.00244148	80	11132 meters	None	Uncertainty in the effective radius of cloud particle determined from DCOMP
cld_temp_acha	K	-32767*	32767*	0.00244148	240	11132 meters	None	Cloud-top temperature computed using ACHA (CDR variable)
cloud_fraction		-127*	127*	0.00393701	0.5	11132 meters	None	Cloud fraction computed over a 3x3 pixel array at the native resolution centered on this pixel
cloud_fraction_uncertainty		-127*		0.00393701	0.5	11132 meters	None	Cloud fraction uncertainty computed over a 3x3 array
cloud_probability		-127*	127*	0.00393701	0.5	11132 meters	None	Probability of a pixel being cloudy from the Bayesian cloud mask
cloud_transmission_0_65um		-127*	127*	0.00393701	0.5	11132 meters	0.65µm	Cloud transmission at 0.65µm from DCOMP
cloud_type						11132 meters	None	Integer classification of the cloud type including clear and aerosol type
cloud_water_path	g/m^2	-127*	127*	4.72441	600	11132 meters	None	Integrated total cloud water over whole column
land_class						11132 meters	None	Land classes
refl_0_65um		-32767*	32767*	0.00186163	59	11132 meters	0.65µm	Top of atmosphere reflectance 0.65µm (CDR variable)
refl_0_65um_counts		-21*	1017*			11132 meters	None	Instrument counts for the 0.65µm channel
refl_0_65um_stddev_3x3		-127*	127*	0.0787402	10	11132 meters	None	Standard deviation of the 0.63µm reflectance computed over a 3x3 pixel array
refl_0_86um		-32767*	32767*	0.00186163	59	11132 meters	0.86µm	Top of atmosphere reflectance at 0.86µm (CDR variable)
refl_0_86um_counts		-21*	1016*			11132 meters	None	Instrument counts for the 0.86µm channel
refl_1_60um		-32767*	32767*	0.00186163	59	11132 meters	1.60µm	Top of atmosphere reflectance at 1.60µm (CDR variable)
refl_1_60um_counts		-12*	1629*			11132 meters	None	Instrument counts for the 1.60µm channel
refl_3_75um		-32767*	32767*	0.00152593	30	11132 meters	3.75µm	Top of atmosphere reflectance at 3.75µm (CDR variable)
relative_azimuth_angle	deg	-127*	127*	0.708661	90	11132 meters	None	Sun-sensor relative azimuth angle; 0 is the principal plane looking towards sun
scan_element_number		-999*	409*			11132 meters	None	Scan element index of the pixel chosen for inclusion in level-2b
scan_line_number		-999*	13835*			11132 meters	None	Scan line number
scan_line_time	h	0*	23.99*			11132 meters	None	Scan line time
sensor_zenith_angle	deg	-127*	68*	0.354331	45	11132 meters	None	Sensor zenith for each pixel measured in degrees from nadir
snow_class						11132 meters	None	Snow classes and values
solar_azimuth_angle	deg	-127*	127*	1.41732		11132 meters	None	Solar azimuth angle in degrees from north, pixel to sun, positive values are clockwise from north
solar_zenith_angle	deg	-101*	101*	0.708661	90	11132 meters	None	Solar zenith for each pixel measured in degrees away from the sun (0=looking at sun)
surface_temperature_retrieved	K	-127*	127*	0.472441	280	11132 meters	None	Surface temperature retrieved using atmospherically corrected 11µm radiance
surface_type						11132 meters	None	UMD surface type
temp_11_0um	K	-32767*	32767*	0.00244148	260	11132 meters	11.0µm	Top of atmosphere brightness temperature at 11.0µm (CDR variable)
temp_11_0um_clear_sky	K	-30853*	32767*	0.00244148	260	11132 meters	None	Top of atmosphere brightness temperature modeled assuming clear skies at 11.0µm
temp_11_0um_stddev_3x3	K	-127*	127*	0.0787402	10.9	11132 meters	None	Standard deviation of the 11.0µm brightness temperature computed over a 3x3 pixel array
temp_12_0um	K	-32767*	32767*	0.00244148	260	11132 meters	12.0µm	Top of atmosphere brightness temperature 12.0µm (CDR variable)
temp_3_75um	K	-32767*	32767*	0.00244148	260	11132 meters	3.75µm	Top of atmosphere brightness temperature 3.75µm (CDR variable)
acha_info						11132 meters	None	ACHA processing information bit flags
Bitmask for acha_info Bit 0: Cloud height attempted 0: No 1: Yes Bit 1: Bias correction employed 0: No 1: Yes Bit 2: Ice cloud retrieval 0: No 1: Yes Bit 3: Local radiative center processing used 0: No 1: Yes Bit 4: Multi-layer retrieval 0: No 1: Yes Bit 5: Lower cloud interpolation used 0: No 1: Yes Bit 6: Boundary layer inversion assumed 0: No 1: Yes
acha_quality						11132 meters	None	ACHA quality flags
Bitmask for acha_quality Bit 0: ACHA products processed 0: No 1: Yes Bit 1: Valid Tc retrieval 0: No 1: Yes Bit 2: Valid ec retrieval 0: No 1: Yes Bit 3: Valid beta retrieval 0: No 1: Yes Bit 4: Degraded Tc retrieval 0: No 1: Yes Bit 5: Degraded ec retrieval 0: No 1: Yes Bit 6: Degraded beta retrieval 0: No 1: Yes
bad_pixel_mask						11132 meters	None	Mask that distinguishes good from bad pixels
Bitmask for bad_pixel_mask Bit 0: Bad pixel mask 0: Good 1: Bad
cloud_mask						11132 meters	None	Integer classification of the cloud mask
dcomp_info						11132 meters	None	Processing flags for DCOMP
Bitmask for dcomp_info Bit 0: Info flag set 0: No 1: Yes Bit 1: Land/sea mask 0: Land 1: Sea Bit 2: Day/night mask 0: Day 1: Night Bit 3: Twilight (65-82 solar zenith) 0: No 1: Yes Bit 4: Snow 0: No 1: Snow Bit 5: Sea-ice 0: No 1: Sea-ice Bit 6: Phase 0: Liquid 1: Ice Bit 7: Thick cloud 0: No 1: Yes Bit 8: Thin cloud 0: No 1: Yes
dcomp_quality						11132 meters	None	DCOMP processing information bit flags
Bitmask for dcomp_quality Bit 0: DCOMP products processed 0: No 1: Yes Bit 1: Valid COD retrieval 0: No 1: Yes Bit 2: Valid REF retrieval 0: No 1: Yes Bit 3: Degraded COD retrieval 0: No 1: Yes Bit 4: Degraded REF retrieval 0: No 1: Yes Bit 5: Convergency 0: No 1: Yes Bit 6: Glint 0: No 1: Yes
glint_mask						11132 meters	None	Glint mask
Bitmask for glint_mask Bit 0: Glint mask 0: No 1: Yes

* estimated min or max value

cloud_type Class Table

Value	Color	Description
0	#73d8ff	Clear
1	#73d8ff	Probably clear
2	#b1d8dc	Fog
3	#030bff	Water
4	#0013a1	Supercooled water
5	#05ffa3	Mixed
6	#d5fff9	Opaque ice
7	#ffffff	Cirrus
8	#b2b8ff	Overlapping
9	#b2b8ff	Overshooting
10	#f8c4ff	Unknown
11	#d7e9a1	Dust
12	#adadad	Smoke

land_class Class Table

Value	Color	Description
0	#46ffba	Shallow ocean
1	#c09968	Land
2	#eddc66	Coastline
3	#32bc76	Shallow inland water
4	#00b5c8	Ephemeral water
5	#338c91	Deep inland water
6	#0109ff	Moderate ocean
7	#010583	Deep ocean

snow_class Class Table

Value	Color	Description
1	#000000	No snow/ice
2	#17b0c0	Sea-ice
3	#ffffff	Snow

surface_type Class Table

Value	Color	Description
0	#0d00d4	Water
1	#096619	Evergreen needle
2	#096619	Evergreen broad
3	#2ac027	Deciduous needle
4	#2ac027	Deciduous broad
5	#a0c800	Mixed forest
6	#7c6e48	Woodlands
7	#dcca76	Wooded grass
8	#c7ff42	Closed shrubs
9	#c7ff42	Open shrubs
10	#00ff5a	Grasses
11	#fff700	Croplands
12	#ffdb77	Bare
13	#9f9f9f	Urban

cloud_mask Class Table

Value	Color	Description
0	#73d8ff	Clear
1	#b1d8dc	Probably clear
2	#d0d0d0	Probably cloudy
3	#9d9d9d	Cloudy

Image Properties

Image Properties

Name	Type	Description
orbit_node	STRING	'ascending' or 'descending'
platform	STRING	Name of platform
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:

• For the TOA Reflectances and Brightness Temperatures users must cite: Andrew K. Heidinger, Michael J. Foster, Andi Walther, Xuepeng Zhao, and NOAA CDR Program (2014): NOAA Climate Data Record (CDR) of Reflectance and Brightness Temperatures from AVHRR Pathfinder Atmospheres - Extended (PATMOS-x), Version 5.3. [indicate subset used]. NOAA National Centers for Environmental Information. doi:10.7289/V56W982J [access date].

• For the cloud properties users must cite: Andrew K. Heidinger, Michael J. Foster, Andi Walther, Xuepeng Zhao, and NOAA CDR Program (2014): NOAA Climate Data Record (CDR) of Cloud Properties from AVHRR Pathfinder Atmospheres - Extended (PATMOS-x), Version 5.3. [indicate subset used]. NOAA National Centers for Environmental Information. doi:10.7289/V5348HCK [access date].

DOIs

• https://doi.org/10.7289/V5348HCK

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Code Editor (JavaScript)

var dataset = ee.ImageCollection('NOAA/CDR/PATMOSX/V53')
                  .filter(ee.Filter.date('2017-05-01', '2017-05-14'));
var cloudEmissivityAndHeight = dataset.select(
    ['cld_emiss_acha', 'cld_height_acha', 'cld_height_uncer_acha']);
Map.setCenter(71.72, 52.48, 1);
Map.addLayer(cloudEmissivityAndHeight, {}, 'Cloud Emissivity and Height');

Open in Code Editor

NOAA CDR PATMOSX: Cloud Properties, Reflectance, and Brightness Temperatures, Version 5.3

This dataset provides high quality Climate Data Record (CDR) of multiple cloud properties along with Advanced Very High Resolution Radiometer (AVHRR) Pathfinder Atmospheres Extended (PATMOS-x) brightness temperatures and reflectances. These data have been fitted to a 0.1 x 0.1 equal angle-grid with both ascending and descending assets generated daily from …

NOAA/CDR/PATMOSX/V53, atmospheric,avhrr,brightness,cdr,climate,cloud,noaa,optical,reflectance,temperature

1979-01-01T00:00:00Z/2022-01-01T00:00:00Z

-90 -180 90 180

Google Earth Engine

https://developers.google.com/earth-engine/datasets

• https://doi.org/10.7289/V5348HCK
• https://doi.org/10.7289/V5348HCK