After thorough scientific research and technical preparations, the PROBA-V Collection 2 reprocessing campaign has started! During the next half year, the entire operational PROBA-V archive (16 October 2013 – 30 June 2020) will be reprocessed into segment and synthesis data of the highest possible quality and consistency for your applications. The improvements and updates with respect to Collection 1 are the following:
- CEOS Analysis Ready Data for Land (CARD4L) compliancy
PROBA-V Collection 2 data will be CARD4L-compliant, which means that it will fulfil a set of accuracy thresholds (e.g. for surface reflectance), that essential corrections are applied, and that the product metadata are structured in a certain format. This will enable you to start analyzing Collection 2 data immediately, without the hassle of complex additional pre-processing.
- Cloud detection algorithm
A Multi-Layer Perceptron (MLP)-based neural network algorithm is applied, with no auxiliary data dependency, resulting in significant improvements compared to the Collection 1 cloud detection.
- Radiometric Instrument Calibration Parameter (ICP) files
The absolute calibration and equalization coefficients are updated, as well as some inter-band corrections to the BLUE channel are performed.
- Atmospheric correction
The Modern-Era Retrospective analysis for Research and Applications, Version 2 (MERRA-2) Aerosol Optical Thickness (AOT) dataset is used as input for the atmospheric correction. Further, using these AOT data the most appropriate aerosol model is selected.
- Product data format
The current Collection 1 data are available as HDF5 and GeoTIFF files. For Collection 2, the new Cloud Optimized GeoTIFF standard, backward compatible with standard GeoTIFF, will be used in addition to the regular HDF5 file format. Using this new and state-of-the-art data format standard eases the file handling and data visualization in cloud environments.
- New product search catalogue
PROBA-V Collection 2 data will become more easily searchable using the OpenSearch CAtalogue for Remote Sensing (OSCARS) from a new, dedicated, and improved user interface, combining the best from PROBA-V’s Mission Exploitation Platform (such as time series and viewing) to give you a seamless user experience and to efficiently analyze the Collection 2 data.
The above listed changes will impact all Level-2A and Level-3 data at all resolutions (100 m, 300 m, and 1 km). We expect that Collection 2, together with its user documentation, becomes available in early 2022. As you can expect from us, we will regularly update you on the reprocessing status.
Last but not least, we announce that PROBA-V’s duties, which were extended with a final experimental phase from July 2020 onwards, will finally have ended by 30 September/31 October 2021.