Remote sensing as a driving tool for Citizen Science phenology monitoring campaigns
Domingo-Marimon, Cristina (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Maso, Joan (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Cristóbal, Jordi (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Batalla, Meritxell (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Ninyerola i Casals, Miquel ed. (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia)

Date:	2020
Abstract:	Phenology monitoring observations have been traditionally linked to citizen science (CS) practices and limited to common species closely located to an observer's residence. This is a modest approximation to cover the strong variability of the vegetation phenology across biomes and to improve the knowledge of vegetation changes as climate change impacts. Thankfully, remote sensing imagery (RS), especially data from high spatial and temporal resolution satellites such as Sentinel-2A and 2B, has the potential to become an essential dataset for in-situ approaches by guiding volunteers in achieving this aim. This study presents the methodological design carried out in Catalunya to harmonize phenological vegetation monitoring protocol between RS and CS making data acquired from both approaches interoperable. First, an Earth Observation Open Data Cube (ODC) containing Sentinel-2 radiometrically corrected data was created. The ODC offers a solution for storing big data products in an efficient way with low-cost hardware and provides easy access to data by indexing it. A selection of ∼40 000 areas presenting a homogeneous cover common species of interest has been extracted from existing vegetation cartography. A time-series analysis of vegetation indices (greening and flowering) derived from the ODC has been performed for each area. A final subset of ∼5 000 areas presenting a flowering amplitude signal > 10% and a greening-up amplitude signal > 20% was extracted and included in an interactive map browser available to CS observers so they are guided to interesting areas to report their phenophase and evaluate their correlation with RS data. This protocol, resulting from the PhenoTandem project (CSEOL-ESA) provides an innovative approach making in-situ observations interoperable with RS products and confirms a promising partnership for phenology monitoring.
Grants:	European Commission 689744 European Commission 776740
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Open Data Cube ; Phenology ; PhenoTandem ; RitmeNatura ; Sentinel-2 ; Time-series
Published in:	Proceedings of SPIE, Vol. 11524, (August 2020) , art. 115241, ISSN 1996-756X

DOI: 10.1117/12.2570842

10 p, 561.2 KB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Grupo de Investigación Métodos y Aplicaciones en Teledetección y Sistemas de Información Geográfica (GRUMETS)
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Articles > Research articles
Articles > Published articles