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Sentinel 5P: TROPOspheric Monitoring Instrument (TROPOMI) Radiance level 1b data.

Status: Ongoing
Online Status: ONLINE
Publication State: Published
Publication Date: 2022-11-04
Download Stats: last 12 months


This dataset contains level 1b earth radiance spectra data from the TROPOspheric Monitoring Instrument (TROPOMI) aboard the European Space Agency (ESA) Sentinel 5P satellite. Sentinel 5P was launched on 13th October 2017. Level 1b data is geo-located and radiometrically corrected top of the atmosphere Earth radiances in all spectral bands. There is one L1b radiance product type for each spectral band (product identifiers L1B_RA_BD1 through L1B_RA_BD8). The radiance products are the main input for the Level-2 processors.

Sentinel 5P aims to provide atmospheric measurements relating to air quality, climate forcing, ozone and ultraviolet radiation. This data looks to build on the data from GOME, SCIAMACHY and OMI missions. Data are provided by the European Space Agency (ESA) and are made available via CEDA to any registered user.

Citable as:  Copernicus; European Space Agency (2022): Sentinel 5P: TROPOspheric Monitoring Instrument (TROPOMI) Radiance level 1b data.. European Space Agency, date of citation.
Abbreviation: Not defined
Keywords: Radiance, ESA, Sentinel 5P


Previous Info:
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Access rules:
Access to these data is available to any registered CEDA user. Please Login or Register for an account to gain access.
Use of these data is covered by the following licence: When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.
Data lineage:

Data collected and prepared by European Space Agency (ESA). Downloaded from the Collaborative Hub for use by registered users of CEDA.

Data Quality:
Data are as given by the data provider, no quality control has been performed by the Centre for Environmental Data Analysis (CEDA).
File Format:
These data are in NetCDF format. As downloaded from the ESA data hubs.

Process overview

This dataset was generated by a combination of instruments deployed on platforms and computations as detailed below.

Instrument/Platform pairings

TROPOspheric Monitoring Instrument (TROPOMI) Deployed on: Sentinel 5 Precursor

Computation Element: 1

Title Level 1B processing algorithm applied to Sentinel 5P TROPOspheric Monitoring Instrument (TROPOMI) raw data
Abstract This computation involves the Level 1b processing algorithm applied to raw TROPOspheric Monitoring Instrument (TROPOMI) data. The Earth radiance measurements form the bulk of the measurements. Apart from the optical properties of the instrument, there is some flexibility in the electronics that determine the Earth's radiance ground pixel size. The co-addition period determines the ground pixel size in the along-track direction. Row binning (which is possible for UVN-DEMs only) determines the ground pixel size across track. The parameter space is limited, however, as choosing a smaller ground pixel size will increase the data rate and will decrease the signal-to-noise ratio for the individual ground pixels. The data rate is limited by both internal interfaces within the instrument as well as by the platform’s on-board storage and down-link capabilities. For the Earth's radiance measurements, the co-addition period can be set to either 1080ms or 840ms. This effectively results in a ground pixel size of approximately 7km or 5.5km along-track. The co-addition period is set in the instrument configuration, initially, the nominal operations phase was started with 1080ms. For the SWIR-DEM, which contains a CMOS detector, row binning is not supported. This means that, effectively, the binning factor is 1 for the SWIR bands (Band 7 and Band 8), resulting in a ground pixel size across-track between 7km at the center and 34km at the edges of the across-track field of view. The ground pixel size varies across-track since the spatial dispersion (degrees/pixel) is constant, resulting in a ground pixel size that becomes larger towards the edges of the across-track field of view due to the Earth’s curvature. Apart from the binning factor and the co-addition period, the remaining configuration parameters for the Earth radiance measurements, including exposure time and gains, have been optimized during in-flight commissioning for the best signal-to-noise ratio while minimizing the saturation of the detector or electronics. This optimization was based on scenes with the highest radiance levels, typically clouded scenes. Since the highest radiance level changes as a function of latitude, a total of five different settings for different latitude zones are created. For bands 4 and 6 saturation, it has not been possible to exclude saturation completely due to instrument limitations. For more information please see the ATBD document linked in the docs tab.
Input Description None
Output Description None
Software Reference None
Output Description None

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