![NOAA/CDR/PATMOSX/V53](https://developers.google.com/earth-engine/datasets/images/NOAA/NOAA_CDR_PATMOSX_V53_sample.png)

Dataset Availability
:   1979-01-01T00:00:00Z--2022-01-01T00:00:00Z

Dataset Producer
:


    [NOAA](https://www.ncei.noaa.gov/products/climate-data-records/avhrr-hirs-cloud-properties-patmos)

Cadence
:   1 Day

Tags
:
    [atmospheric](https://developers.google.com/earth-engine/datasets/tags/atmospheric) [avhrr](https://developers.google.com/earth-engine/datasets/tags/avhrr) [brightness](https://developers.google.com/earth-engine/datasets/tags/brightness) [cdr](https://developers.google.com/earth-engine/datasets/tags/cdr) [climate](https://developers.google.com/earth-engine/datasets/tags/climate) [cloud](https://developers.google.com/earth-engine/datasets/tags/cloud) [noaa](https://developers.google.com/earth-engine/datasets/tags/noaa) [optical](https://developers.google.com/earth-engine/datasets/tags/optical) [reflectance](https://developers.google.com/earth-engine/datasets/tags/reflectance) [temperature](https://developers.google.com/earth-engine/datasets/tags/temperature) [weather-and-climate](https://developers.google.com/earth-engine/datasets/tags/weather-and-climate) 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)](https://www.ncei.noaa.gov/pub/data/sds/cdr/CDRs/AVHRR-HIRS_Reflectance_PATMOS-x/AlgorithmDescription%20_01B-1c.pdf).

### 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](https://www1.ncdc.noaa.gov/pub/data/sds/cdr/CDRs/Aerosol_Optical_Thickness/UseAgreement_01B-04.pdf)
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](https://doi.org/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](https://doi.org/10.7289/V5348HCK)
  \[access date\].

### DOIs

- <https://doi.org/10.7289/V5348HCK>

### Explore with Earth Engine

> [!NOTE]
> **Important:** Earth Engine is a platform for petabyte-scale scientific analysis and visualization of geospatial datasets, both for public benefit and for business and government users. Earth Engine is free to use for research, education, and nonprofit use. To get started, please [register for Earth Engine access.](https://console.cloud.google.com/earth-engine)

### Code Editor (JavaScript)

```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](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/NOAA/NOAA_CDR_PATMOSX_V53) [NOAA CDR PATMOSX: Cloud Properties, Reflectance, and Brightness Temperatures, Version 5.3](https://developers.google.com/earth-engine/datasets/catalog/NOAA_CDR_PATMOSX_V53) 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,weather-and-climate 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/https://www.ncei.noaa.gov/products/climate-data-records/avhrr-hirs-cloud-properties-patmos)
- [https://doi.org/10.7289/V5348HCK](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/NOAA_CDR_PATMOSX_V53)