Customer: ESA Document Ref.: 3MPC.ACR.HBK.002 Contract No.: 4000111836/14/I-LG Date: 14/06/2021 Issue: 1.1 PREPARATION AND OPERATIONS OF THE MISSION PERFORMANCE CENTRE (MPC) Project: FOR THE COPERNICUS SENTINEL-3 MISSION Title: Copernicus Sentinel-3 SLSTR Land User Handbook E. Polehampton, C. Cox, D. Smith (RAL Space), D. Ghent (ULEIC), M. Wooster, W. Xu Author(s): (KCL), J. Bruniquel (ACRI-ST), S. Dransfeld (ESA) Filename Sentinel3-SLSTR-Land-Handbook - i1r1 - 14Jun2021.docx Disclaimer The work performed in the frame of this contract is carried out with funding by the European Union. The views expressed herein can in no way be taken to reflect the official opinion of either the European Union or the European Space Agency. Ref.: 3MPC.ACR.HBK.002 Copernicus Sentinel-3 SLSTR Land User Issue: 1.1 Handbook Date: 14/06/2021 Page: ii Changes Log Version Date Changes 1.0 15/02/2021 First version 1.1 14/06/2021 Updated version to account for the new LST uncertainties and the evolution of the snow masking List of Changes Version Section Changes 1.1 5.1.1; 6.2.1 Snow masking evolution in LST processing 5.1.1; 6.2.1 LST uncertainties evolution Ref.: 3MPC.ACR.HBK.002 Copernicus Sentinel-3 SLSTR Land User Issue: 1.1 Handbook Date: 14/06/2021 Page: iii Table of content 1 INTRODUCTION ......................................................................................................................... 1 2 SLSTR LAND QUICK START .......................................................................................................... 2 3 GENERAL INFORMATION ............................................................................................................ 4 3.1 The Copernicus Programme ......................................................................................................... 4 3.2 The European Space Agency ........................................................................................................ 4 3.3 The Sentinel-3 mission ................................................................................................................. 6 4 SLSTR ACQUISITIONS .................................................................................................................. 7 4.1 SLSTR instrument specifics ........................................................................................................... 7 4.2 Land measurement principles ...................................................................................................... 8 4.2.1 Land Surface Temperature ....................................................................................................... 8 4.2.2 Fire Radiative Power ................................................................................................................. 9 4.3 Calibration and Validation .......................................................................................................... 11 4.3.1 Thermal Infrared Channels ..................................................................................................... 11 4.3.2 Visible/Short Wave Infrared Channels ................................................................................... 12 5 SLSTR ALGORITHMS AND PROCESSING LEVELS .......................................................................... 13 5.1 Level-2 ........................................................................................................................................ 13 5.1.1 Land Surface Temperature ..................................................................................................... 13 5.1.2 Fire Radiative Power ............................................................................................................... 15 5.2 Level-1 ........................................................................................................................................ 18 6 SLSTR PRODUCTS ..................................................................................................................... 20 6.1 Introduction to SLSTR land products .......................................................................................... 20 6.2 Level-2 product content ............................................................................................................. 21 6.2.1 Land Surface Temperature ..................................................................................................... 21 6.2.2 Fire Radiative Power ............................................................................................................... 25 6.3 Level-1 product content ............................................................................................................. 30 6.3.1 Channel pairs .......................................................................................................................... 30 6.3.2 Channel-grid families .............................................................................................................. 31 7 DATA QUALITY INFORMATION ................................................................................................. 33 7.1 Radiometric quality .................................................................................................................... 33 7.1.1 Thermal Infrared Channels ..................................................................................................... 33 7.1.2 Visible/Short Wave Infrared Channels ................................................................................... 34 7.2 Geolocation accuracy ................................................................................................................. 35 7.3 LST Quality and Validation.......................................................................................................... 35 7.4 FRP Quality and Validation ......................................................................................................... 39 8 HELPDESK ................................................................................................................................ 44 8.1 Access and use of SLSTR products .............................................................................................. 44 Ref.: 3MPC.ACR.HBK.002 Copernicus Sentinel-3 SLSTR Land User Issue: 1.1 Handbook Date: 14/06/2021 Page: iv 8.1.1 How to get access to SLSTR products? ................................................................................... 44 8.1.2 How to read and display the SLSTR products? ....................................................................... 44 8.2 FAQ ............................................................................................................................................. 45 8.2.1 Where can I find information about the latest version of processing? ................................. 45 8.2.2 How can I find the version used for the processing of an individual product? ...................... 45 8.2.3 How to get information about past anomalies or events? .................................................... 45 8.2.4 Why are there sometimes blank areas in the thermal channel images? ............................... 46 8.2.5 How to interpolate from tie point to image grid? .................................................................. 46 8.2.6 How to calculate the acquisition time of any pixel in a L1/L2 image? ................................... 47 8.2.7 How to calculate the relative angle between the satellite and Sun? ..................................... 47 8.2.8 How to convert from brightness temperature to radiance in the Level-1 product? ............. 47 8.2.9 How to convert from radiance to reflectance in the Level-1 product?.................................. 48 8.2.10 How to find the SLSTR spectral response functions? ............................................................. 48 8.2.11 How to find the centre of the swath in the image? ............................................................... 48 8.2.12 What is cosmetic filling? ......................................................................................................... 48 8.2.13 What is an orphan pixel and are they useful? ........................................................................ 49 8.2.14 Why is there a stripe of unfilled pixels at the sides of the image? ........................................ 49 8.2.15 What is the difference between the different cloud masks in the Level-1 product? ............ 50 8.3 If you have a question ................................................................................................................ 50 8.4 Useful links ................................................................................................................................. 51 8.4.1 About Copernicus ................................................................................................................... 51 8.4.2 About ESA and the Sentinel missions ..................................................................................... 51 8.4.3 About SLSTR ............................................................................................................................ 51 8.4.4 About S3 toolbox .................................................................................................................... 51 8.5 References .................................................................................................................................. 51 8.6 Acronyms and abbreviations .....................................................................................................