analysed to evaluate the spatial distribution of Leaf Area Index and soil water content in different types of crops. To this end, regular grids of measurements of soil water content have been acquired in coincidence to the flight acquisitions in two fields. LAI has been measured in distinct locations within the fields by means of the Licor LAI-2000 optical analyser and maps of LAI have been derived from CASI data by using an inversion procedure of the PROSAILH canopy radiative transfer code. The resulting map has been used to assess the correlation between the LAI estimated by using optical data and the surface backscattering in bands X, C and L of AGRISAR. Diversely, in the case of soil water content, the analysis has been performed by using a grid of approximately 80 measurements taken by using an FDR sensor to detect the volumetric water content in the upper 6-7 cm of soil in a vegetated field. SAR data in bands C and L have been considered to verify the possibility of detecting soil water content in presence of a vegetation cover. Successively, the application of semi-empirical models for LAI (X-band) and for soil water content (C and L bands) has been evaluated with and without on-site calibration.
Analysis of leaf area index and soil water content retrieval from Agrisar data sets / D'Urso, Guido; Dini, L.; Richter, K.; Palladino, Mario. - Proceedings AGRISAR and EAGLE Campaigns FinalWorkshop,:(2007), pp. 279-284. (Intervento presentato al convegno Proceedings AGRISAR and EAGLE Campaigns FinalWorkshop, tenutosi a Noordwijk, The Netherlands nel 15–16 October, 2007).
Analysis of leaf area index and soil water content retrieval from Agrisar data sets
D'URSO, GUIDO;PALLADINO, MARIO
2007
Abstract
analysed to evaluate the spatial distribution of Leaf Area Index and soil water content in different types of crops. To this end, regular grids of measurements of soil water content have been acquired in coincidence to the flight acquisitions in two fields. LAI has been measured in distinct locations within the fields by means of the Licor LAI-2000 optical analyser and maps of LAI have been derived from CASI data by using an inversion procedure of the PROSAILH canopy radiative transfer code. The resulting map has been used to assess the correlation between the LAI estimated by using optical data and the surface backscattering in bands X, C and L of AGRISAR. Diversely, in the case of soil water content, the analysis has been performed by using a grid of approximately 80 measurements taken by using an FDR sensor to detect the volumetric water content in the upper 6-7 cm of soil in a vegetated field. SAR data in bands C and L have been considered to verify the possibility of detecting soil water content in presence of a vegetation cover. Successively, the application of semi-empirical models for LAI (X-band) and for soil water content (C and L bands) has been evaluated with and without on-site calibration.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
