Abstract
The Copernicus Global Land Service (CGLS) provides global time series of leaf area index (LAI), fraction of absorbed photosynthetically active radiation (fAPAR) and fraction of vegetation cover (fCOVER) data at a resolution of 300 m and a frequency of 10 days. We performed a quality assessment and validation of Version 1 Collection 300 m products that were consistent with the guidelines of the Land Product Validation (LPV) subgroup of the Committee on Earth Observation System (CEOS) Working Group on Calibration and Validation (WGCV). The spatiotemporal patterns of Collection 300 m V1 LAI, fAPAR and fCOVER products are consistent with CGLS Collection 1 km V1, Collection 1 km V2 and Moderate Resolution Imagery Spectroradiometer Collection 6 (MODIS C6) products. The Collection 300 m V1 products have good precision and smooth temporal profiles, and the interannual variations are consistent with similar satellite products. The accuracy assessment using ground measurements mainly over crops shows an overall root mean square deviation of 1.01 (44.3%) for LAI, 0.12 (22.2%) for fAPAR and 0.21 (42.6%) for fCOVER, with positive mean biases of 0.36 (15.5%), 0.05 (10.3%) and 0.16 (32.2%), respectively. The products meet the CGLS user accuracy requirements in 69.1%, 62.5% and 29.7% of the cases for LAI, fAPAR and fCOVER, respectively. The CGLS will continue the production of Collection 300 m V1 LAI, fAPAR and fCOVER beyond the end of the PROBA-V mission by using Sentinel-3 OLCI as input data.
Highlights
The Copernicus programme is the European Union’s Earth observation and monitoring programme, and it records data on the Earth and its ecosystems for the ultimate benefit of all citizens
The aim of this paper is to assess the quality of Collection 300 m Version 1 (V1) leaf area index (LAI), fraction of absorbed photosynthetically active radiation (fAPAR) and fraction of vegetation cover (fCOVER) products derived from PROBA-V sensor data and to determine whether they are compliant with Copernicus Global Land Service (CGLS) requirements
For the accuracy assessment we considered only the Collection 300 m V1 PROBA-V pixels for which more than 70% of the corresponding high-resolution pixels were within the convex hull
Summary
The Copernicus programme is the European Union’s Earth observation and monitoring programme, and it records data on the Earth and its ecosystems for the ultimate benefit of all citizens. A variety of technologies, including satellites and ground-based, sea-based and air-based measurements systems, allows Copernicus to deliver operational data and information services openly and freely in a wide range of application areas. Service (CLMS) provides geographical information on land cover, land change and a variety of geophysical variables of the biosphere and the cryosphere. The CLMS global component, known as the Copernicus Global Land Service (CGLS) [1], ensures operational monitoring of the continental ecosystems through the provision of terrestrial geophysical variables that are needed to characterise the energy, carbon and water cycles. The CGLS products are delivered in near real time on a worldwide scale. The CGLS provides data for European Union policies in agriculture and food security, biodiversity and environmental protection, natural resources management and climate change
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