Search results for "Geomatic"

Consistent Regression of Biophysical Parameters with Kernel Methods

2020

This paper introduces a novel statistical regression framework that allows the incorporation of consistency constraints. A linear and nonlinear (kernel-based) formulation are introduced, and both imply closed-form analytical solutions. The models exploit all the information from a set of drivers while being maximally independent of a set of auxiliary, protected variables. We successfully illustrate the performance in the estimation of chlorophyll content.

Application of Geostatistical Tools to the Geochemical Characterization of the Peloritani Mts (Sicily, Italy) Aquifers

2021

Sources of groundwater contaminants in inhabited areas, located in complex geo-tectonic contexts, are often deeply interlocked, thus, making the discrimination between anthropic and natural origins difficult. In this study, we investigate the Peloritani Mountain aquifers (Sicily, Italy), using the combination of probability plots with concentration contour maps to retrieve an overall view of the groundwater geo-chemistry with a special focus on the flux of heavy metals. In particular, we present a methodology for integrating spatial data with very different levels of precision, acquired before and during the “geomatic era”. Our results depict a complex geochemical layout driven by a geo-puz…

Ricerche di Geomatica 2008. Studi presentati alla quarta edizione del premio AUTeC

2009

Ricerche di Geomatica 2011

2011

Questo volume raccoglie gli articoli che hanno partecipato al Premio AUTeC 2011. Il premio è stato istituito nel 2005. Viene conferito ogni anno ad una tesi di Dottorato giudicata particolarmente significativa sui temi di pertinenza del SSD ICAR/06 (Topografia e Cartografia) nei diversi Dottorati attivi in Italia.

L’insegnamento della Geomatica nell’attuale quadro dell’offerta formativa universitaria

2010

L’articolo riporta e analizza i risultati del censimento promosso nello scorso anno dall’AUTeC (Associazione Universitari di Topografi a e Cartografi a), relativamente all’offerta didattica universitaria svolta in questo settore disciplinare, confrontandoli con quelli dei due precedenti censimenti effettuati negli anni 2005 e 2007. Da questo confronto emerge l’evoluzione dell’insegnamento delle discipline topografi che successivamente alla riforma Berlinguer-Zecchino, che ha radicalmente cambiato obiettivi e organizzazione didattica dei vari corsi di laurea, e dopo le prime fasi di applicazione del nuovo ordinamento.

Geomatica e Microsimulazione. Una metodologia integrata per l’analisi di un’intersezione stradale urbana

2009

Ricerche di Geomatica 2009

2010

Il premio AUTeC (Associazione Nazionale Universitari di Topografia e Cartografia) è stato istituito nel 2005. Viene conferito ogni anno ad una tesi di Dottorato giudicata particolarmente significativa fra quelle discusse nell’anno in corso sui temi di pertinenza del SSD ICAR/06 (Topografia e Cartografia) nei diversi Dottorati attivi in Italia. Ciascun candidato riassume in un articolo i punti salienti delle propria tesi. Gli articoli vengono sottoposti al giudizio di una Commissione giudicatrice costituita dai professori del SSD ICAR/06 che, nell’anno in cui si conferisce il premio, hanno rivestito il ruolo di Presidente nelle diverse Commissioni che hanno attribuito il titolo di Dottore di…

A Semantic Web Approach for Geodata Discovery

2013

International audience; Currently, vast amounts of geospatial information are o ffered through OGC's services. However this information has limited formal semantics. The most common method to search for a dataset consists in matching keywords to metadata elements. By adding semantics to available descriptions we could use modern inference and reasoning mechanisms currently available in the SemanticWeb. In this paper we present a novel architecture currently in development in which we use state of the art triplestores as the backend of a CSW service. In our approach, each metadata record is considered an instance of a given class in a domain ontology. Our architecture also adds a spatial dat…

Introducing the Time Series Change Visualization and Interpretation (TSCVI) method for the interpretation of global NDVI changes

2021

Abstract This paper presents a novel method for the visualization of changes in vegetation related variables. This method, termed Time Series Change Visualization and Interpretation (TSCVI), allows to summarize changes associated to both vegetation productivity and phenology in a single map. To that end, three metrics are retrieved on an annual basis from plotting NDVI (Normalized Difference Vegetation Index) values on a polar plot. Changes in these metrics are then analyzed and mapped in an IHS (Intensity Hue Saturation) image, where colors indicate changes regarding the growing-season (earlier or later occurrence, stronger or weaker seasonality), while changes associated to productivity a…

Estimation of leaf area index using PROSAIL based LUT inversion, MLRA-GPR and empirical models: Case study of tropical deciduous forest plantation, N…

2020

Abstract Forests play a vital role in biological cycles and environmental regulation. To understand the key processes of forest canopies (e.g., photosynthesis, respiration and transpiration), reliable and accurate information on spatial variability of Leaf Area Index (LAI), and its seasonal dynamics is essential. In the present study, we assessed the performance of biophysical parameter (LAI) retrieval methods viz. Look-Up Table (LUT)-inversion, MLRA-GPR (Machine Learning Regression Algorithm- Gaussian Processes Regression) and empirical models, for estimating the LAI of tropical deciduous plantation using ARTMO (Automated Radiative Transfer Models Operator) tool and Sentinel-2 satellite im…