Validation of Sentinel-2, MODIS, CGLS, SAF, GLASS and C3S leaf area index products in maize crops
Yu, Huinan (Southwest Jiaotong University. Faculty of Geosciences and Environmental Engineering)
Yin, Gaofei (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Liu, Guoxiang (Southwest Jiaotong University. Faculty of Geosciences and Environmental Engineering)
Ye, Yuanxin (Southwest Jiaotong University. Faculty of Geosciences and Environmental Engineering)
Qu, Yonghua (Chinese Academy of Sciences. Institute of Remote Sensing and Digital Earth)
Xu, Baodong (Huazhong Agricultural University. Macro Agriculture Research Institute)
Verger, Aleixandre (Centre de Recerca Ecològica i d'Aplicacions Forestals)

Fecha:	2021
Resumen:	We proposed a direct approach to validate hectometric and kilometric resolution leaf area index (LAI) products that involved the scaling up of field-measured LAI via the validation and recalibration of the decametric Sentinel-2 LAI product. We applied it over a test study area of maize crops in northern China using continuous field measurements of LAINet along the year 2019. Sentinel-2 LAI showed an overall accuracy of 0. 67 in terms of Root Mean Square Error (RMSE) and it was used, after recalibration, as a benchmark to validate six coarse resolution LAI products: MODIS, Copernicus Global Land Service 1 km Version 2 (called GEOV2) and 300 m (GEOV3), Satellite Application Facility EUMETSAT Polar System (SAF EPS) 1. 1 km, Global LAnd Surface Satellite (GLASS) 500 m and Copernicus Climate Change Service (C3S) 1 km V2. GEOV2, GEOV3 and MODIS showed a good agreement with reference LAI in terms of magnitude (RMSE ≤ 0. 29) and phenology. SAF EPS (RMSE = 0. 68) and C3S V2 (RMSE = 0. 41), on the opposite, systematically underestimated high LAI values and showed systematic differences for phenological metrics: a delay of 6 days (d), 20 d and 24 d for the start, peak and the end of growing season, respectively, for SAF EPS and an advance of −4 d, −6 d and −6 d for C3S.
Ayudas:	European Commission 835541
Nota:	Altres ajuts: this research was funded by the Copernicus Global Land Service (CGLOPS-1, 199494-JRC).
Derechos:	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.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Leaf area index ; Validation ; Multi-resolution satellite products ; Time series ; Sentinel-2 ; Multi-temporal ground data
Publicado en:	Remote sensing (Basel), Vol. 13, issue 22 (Nov. 2021) , art 4529, ISSN 2072-4292

DOI: 10.3390/rs13224529

18 p, 2.3 MB

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Documentos de investigación > Documentos de los grupos de investigación de la UAB > Centros y grupos de investigación (producción científica) > Ciencias > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals)
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