Sentinel-5P NRTI CLOUD: Near Real-Time Cloud

COPERNICUS/S5P/NRTI/L3_CLOUD
Dataset Availability
2018-07-05T23:24:16Z–2024-12-29T08:45:07Z
Dataset Provider
Earth Engine Snippet
ee.ImageCollection("COPERNICUS/S5P/NRTI/L3_CLOUD")
Revisit Interval
2 Days
Tags
climate cloud copernicus dlr esa eu s5p sentinel tropomi

Description

NRTI/L3_CLOUD

This dataset provides near real-time high-resolution imagery of cloud parameters.

The TROPOMI/S5P cloud properties retrieval is based on the OCRA and ROCINN algorithms currently being used in the operational GOME and GOME-2 products. OCRA retrieves the cloud fraction using measurements in the UV/VIS spectral regions and ROCINN retrieves the cloud height (pressure) and optical thickness (albedo) using measurements in and around the oxygen A-band at 760 nm. Version 3.0 of the algorithms are used, which are based on a more realistic treatment of clouds as optically uniform layers of light-scattering particles. Additionally, the cloud parameters are also provided for a cloud model which assumes the cloud to be a Lambertian reflecting boundary. More information.

NRTI L3 Product

To make our NRTI L3 products, we use harpconvert to grid the data.

Example harpconvert invocation for one tile: harpconvert --format hdf5 --hdf5-compression 9 -a 'cloud_fraction>50;derive(datetime_stop {time}); bin_spatial(2001, 50.000000, 0.01, 2001, -120.000000, 0.01); keep(cloud_fraction,cloud_top_pressure,cloud_top_height, cloud_base_pressure,cloud_base_height,cloud_optical_depth,surface_albedo, sensor_azimuth_angle,sensor_zenith_angle,solar_azimuth_angle, solar_zenith_angle)' S5P_NRTI_L2__CLOUD__20190208T230503_20190208T231003_06860_01_010105_20190209T005255.nc output.h5

Assets between the dates 2018-07-10 and 2018-07-18 are missing due to non-standard structure of product files.

Bands

Resolution
1113.2 meters

Bands

Name Units Min Max Description
cloud_fraction Fraction 0* 1*

Retrieved effective radiometric cloud fraction
cloud_top_pressure Pa 12109* 101299*

Retrieved atmospheric pressure at the level of cloud top
cloud_top_height m 9* 15471*

Retrieved altitude of the cloud top
cloud_base_pressure Pa 14169* 101299*

Cloud base pressure
cloud_base_height m 9* 14545*

Cloud base height
cloud_optical_depth m 1* 250*

Retrieved cloud optical depth
surface_albedo 0* 1*

Surface albedo
sensor_azimuth_angle deg -180* 180*

Azimuth angle of the satellite at the ground pixel location (WGS84); angle measured East-of-North.
sensor_zenith_angle deg 0.09* 67*

Zenith angle of the satellite at the ground pixel location (WGS84); angle measured away from the vertical.
solar_azimuth_angle deg -180* 180*

Azimuth angle of the Sun at the ground pixel location (WGS84); angle measured East-of-North.
solar_zenith_angle deg 8* 80*

Zenith angle of the satellite at the ground pixel location (WGS84); angle measured away from the vertical.
* estimated min or max value

Image Properties

Image Properties

Name Type Description
ALGORITHM_VERSION STRING

The algorithm version used in L2 processing. It is separate from the processor (framework) version, to accommodate different release schedules for different products.
BUILD_DATE STRING

The date, expressed as milliseconds since 1 Jan 1970, when the software used to perform L2 processing was built.
HARP_VERSION INT

The version of the HARP tool used to grid the L2 data into an L3 product.
INSTITUTION STRING

The institution where data processing from L1 to L2 was performed.
L3_PROCESSING_TIME INT

The date, expressed as milliseconds since 1 Jan 1970, when Google processed the L2 data into L3 using harpconvert.
LAT_MAX DOUBLE

The maximum latitude of the asset (degrees).
LAT_MIN DOUBLE

The minimum latitude of the asset (degrees).
LON_MAX DOUBLE

The maximum longitude of the asset (degrees).
LON_MIN DOUBLE

The minimum longitude of the asset (degrees).
ORBIT INT

The orbit number of the satellite when the data was acquired.
PLATFORM STRING

Name of the platform which acquired the data.
PROCESSING_STATUS STRING

The processing status of the product on a global level, mainly based on the availability of auxiliary input data. Possible values are "Nominal" and "Degraded".
PROCESSOR_VERSION STRING

The version of the software used for L2 processing, as a string of the form "major.minor.patch".
PRODUCT_ID STRING

Id of the L2 product used to generate this asset.
PRODUCT_QUALITY STRING

Indicator that specifies whether the product quality is degraded or not. Allowed values are "Degraded" and "Nominal".
SENSOR STRING

Name of the sensor which acquired the data.
SPATIAL_RESOLUTION STRING

Spatial resolution at nadir. For most products this is 3.5x7km2, except for L2__O3__PR, which uses 28x21km2, and L2__CO____ and L2__CH4___, which both use 7x7km2. This attribute originates from the CCI standard.
TIME_REFERENCE_DAYS_SINCE_1950 INT

Days from 1 Jan 1950 to when the data was acquired.
TIME_REFERENCE_JULIAN_DAY DOUBLE

The Julian day number when the data was acquired.
TRACKING_ID STRING

UUID for the L2 product file.
CLOUD_MODE STRING

Tells which model was used to generate this dataset, the CAL (Clouds As Layers) model or the CRB (Clouds as Reflecting Boundaries) model. Valid values of this property are "cal" or "crb", respectively, with "cal" being the default.
STATUS_MET_2D STRING

This dataset uses some dynamic auxiliary data from the European Centre for Medium-Range Weather Forecasts. If the ECMWF data was used, this field will have the value 'Nominal'. If the ECMWF data was not used, a fallback solution was used, and this field will have the value of "Fallback".

Terms of Use

Terms of Use

The use of Sentinel data is governed by the Copernicus Sentinel Data Terms and Conditions.

Explore with Earth Engine

Code Editor (JavaScript)

var collection = ee.ImageCollection('COPERNICUS/S5P/NRTI/L3_CLOUD')
  .select('cloud_fraction')
  .filterDate('2019-06-01', '2019-06-02');

var band_viz = {
  min: 0,
  max: 0.95,
  palette: ['black', 'blue', 'purple', 'cyan', 'green', 'yellow', 'red']
};

Map.addLayer(collection.mean(), band_viz, 'S5P Cloud');
Map.setCenter(-58.14, -10.47, 2);
Open in Code Editor
NRTI/L3_CLOUD This dataset provides near real-time high-resolution imagery of cloud parameters. The TROPOMI/S5P cloud properties retrieval is based on the OCRA and ROCINN algorithms currently being used in the operational GOME and GOME-2 products. OCRA retrieves the cloud fraction using measurements in the UV/VIS spectral regions and ROCINN retrieves the …
COPERNICUS/S5P/NRTI/L3_CLOUD, climate,cloud,copernicus,dlr,esa,eu,s5p,sentinel,tropomi
2018-07-05T23:24:16Z/2024-12-29T08:45:07Z
Google Earth Engine