Search results for "Rosai"
showing 10 items of 13 documents
Global Sensitivity Analysis of Leaf-Canopy-Atmosphere RTMs: Implications for Biophysical Variables Retrieval from Top-of-Atmosphere Radiance Data.
2019
Knowledge of key variables driving the top of the atmosphere (TOA) radiance over a vegetated surface is an important step to derive biophysical variables from TOA radiance data, e.g., as observed by an optical satellite. Coupled leaf-canopy-atmosphere Radiative Transfer Models (RTMs) allow linking vegetation variables directly to the at-sensor TOA radiance measured. Global Sensitivity Analysis (GSA) of RTMs enables the computation of the total contribution of each input variable to the output variance. We determined the impacts of the leaf-canopy-atmosphere variables into TOA radiance using the GSA to gain insights into retrievable variables. The leaf and canopy RTM PROSAIL was coupled with…
Multitemporal and multiresolution leaf area index retrieval for operational local rice crop monitoring
2016
Abstract This paper presents an operational chain for high-resolution leaf area index (LAI) retrieval from multiresolution satellite data specifically developed for Mediterranean rice areas. The proposed methodology is based on the inversion of the PROSAIL radiative transfer model through the state-of-the-art nonlinear Gaussian process regression (GPR) method. Landsat and SPOT5 data were used for multitemporal LAI retrievals at high-resolution. LAI estimates were validated using time series of in situ LAI measurements collected during the rice season in Spain and Italy. Ground LAI data were collected with smartphones using PocketLAI, a specific phone application for LAI estimation. Temporal…
Quantifying the Robustness of Vegetation Indices through Global Sensitivity Analysis of Homogeneous and Forest Leaf-Canopy Radiative Transfer Models
2019
Vegetation indices (VIs) are widely used in optical remote sensing to estimate biophysical variables of vegetated surfaces. With the advent of spectroscopy technology, spectral bands can be combined in numerous ways to extract the desired information. This resulted in a plethora of proposed indices, designed for a diversity of applications and research purposes. However, it is not always clear whether they are sensitive to the variable of interest while at the same time, responding insensitive to confounding factors. Hence, to be able to quantify the robustness of VIs, a systematic evaluation is needed, thereby introducing a widest possible variety of biochemical and structural heterogeneit…
Retrieval of Crop Variables from Proximal Multispectral UAV Image Data Using PROSAIL in Maize Canopy
2022
Mapping crop variables at different growth stages is crucial to inform farmers and plant breeders about the crop status. For mapping purposes, inversion of canopy radiative transfer models (RTMs) is a viable alternative to parametric and non-parametric regression models, which often lack transferability in time and space. Due to the physical nature of RTMs, inversion outputs can be delivered in sound physical units that reflect the underlying processes in the canopy. In this study, we explored the capabilities of the coupled leaf–canopy RTM PROSAIL applied to high-spatial-resolution (0.015 m) multispectral unmanned aerial vehicle (UAV) data to retrieve the leaf chlorophyll content (LC…
Assessing Non-Photosynthetic Cropland Biomass from Spaceborne Hyperspectral Imagery
2021
Non-photosynthetic vegetation (NPV) biomass has been identified as a priority variable for upcoming spaceborne imaging spectroscopy missions, calling for a quantitative estimation of lignocellulosic plant material as opposed to the sole indication of surface coverage. Therefore, we propose a hybrid model for the retrieval of non-photosynthetic cropland biomass. The workflow included coupling the leaf optical model PROSPECT-PRO with the canopy reflectance model 4SAIL, which allowed us to simulate NPV biomass from carbon-based constituents (CBC) and leaf area index (LAI). PROSAIL-PRO provided a training database for a Gaussian process regression (GPR) algorithm, simulating a wide range of non…
Multiple Cost Functions and Regularization Options for Improved Retrieval of Leaf Chlorophyll Content and LAI through Inversion of the PROSAIL Model
2013
Abstract: Lookup-table (LUT)-based radiative transfer model inversion is considered a physically-sound and robust method to retrieve biophysical parameters from Earth observation data but regularization strategies are needed to mitigate the drawback of ill-posedness. We systematically evaluated various regularization options to improve leaf chlorophyll content (LCC) and leaf area index (LAI) retrievals over agricultural lands, including the role of (1) cost functions (CFs); (2) added noise; and (3) multiple solutions in LUT-based inversion. Three families of CFs were compared: information measures, M-estimates and minimum contrast methods. We have only selected CFs without additional parame…
Pleomorphic cutaneous Rosai-Dorfman disease.
2016
we report three cases of pure cutaneous Rosai-Dorfman disease (RDD) showing prominent nuclear pleomorphism. This unusual finding confers a worrisome appearance to these lesions, challenging their recognition and creating difficulty in the differential diagnosis with malignant neoplasms. This article is protected by copyright. All rights reserved.
A tribute to Juan Rosai
2021
On July 7, 2020 the world of Surgical Pathology lost one of the brightest minds ever: Prof. Juan Rosai.It certainly happened to many of us while approaching a difficult case to exclaim: - This is a case for Juan Rosai! This simple expression synthesizes the legend that was created around him.Those who knew him personally were undoubtedly amazed by his diagnostic insight, exceptional memory and organizational skills.However, his vast culture and passions were not limited to medicine, but ranged to music, literature and the world of sports, especially football.We worked with him in his last years of activity and want to share with the communities of pathologists our warm feelings about this …
Cristina Costanzo, a cura di, "Apparati. Schede delle opere", in S. Troisi, a cura di, "Trame del '900. Opere della Collezione Galvagno", Silvana Edi…
2014
Il catalogo della mostra "Trame del '900. Opere della Collezione Galvagno" - a cura di S. Troisi, tenutasi presso le Fabbriche Chiaramontane di Agrigento e organizzata dall'Associazione Amici della Pittura Siciliana dell'Ottocento - prevede la sezione intitolata "Apparati" con n. 88 "Schede delle opere" a cura di Cristina Costanzo. Le schede riguardano le opere degli artisti Carla Accardi, Antonio Sanfilippo, Pietro De Francisco, Aleardo Terzi, Giacomo Balla, Pippo Rizzo, Giovanni Varvaro, Renato Guttuso, Bruno Caruso, Giuseppe Migneco, Ottone Rosai, Piero Dorazio, Emilio Vedova, Giuseppe Capogrossi, Arnaldo Pomodoro, Pietro Consagra, Giuseppe Santomaso, Fausto Pirandello etc
Sinus histiocytosis with massive lymphadenopathy : is the lymph node enlargement always massive?
2007
Sinus histiocytosis with massive lymphadenopathy (SHML) is a benign proliferating histiocytic disorder, predominantly of lymph nodes with extra-nodal involvement in some cases. It is a self-limiting disease and has a good prognosis; however some patients need steroid therapy. Therein lays a need to differentiate it from other lympho proliferative disorders of poorer prognosis. Clinically, it is suspected only when there is a significant lymph node enlargement in younger age group as the term signifies. Recently, we came across a case where a middle-aged female presented with a subtle swelling in submental region, clinically suspected of reactive or tubercular etiology. However on fine needl…