Andrea Gatti

Andrea Gatti
Geomatics Research & Development s.r.l. | GReD

PhD

About

42
Publications
8,473
Reads
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323
Citations
Citations since 2016
23 Research Items
263 Citations
20162017201820192020202120220102030405060
20162017201820192020202120220102030405060
20162017201820192020202120220102030405060
20162017201820192020202120220102030405060

Publications

Publications (42)
Article
Full-text available
In this article, we report the first investigation over time of the atmospheric conditions around terrestrial gamma-ray flash (TGF) occurrences, using GPS sensors in combination with geostationary satellite observations and ERA5 reanalysis data. The goal is to understand which characteristics are favorable to the development of these events and to...
Preprint
In this article we report the first investigation over time of the atmospheric conditions around TGFs occurrence, using GPS sensors in combination with geostationary satellite observations and ERA5 reanalyses data. The goal is to understand which characteristics are favourable to the development of these events and to investigate if any precursor s...
Article
The tropospheric delay is an essential source of error for positioning using the Global Navigation Satellite System (GNSS). Scientific applications of GNSS positioning such as the study of earth crust deformation and earthquake prediction require high accuracy in positioning, an analysis of tropospheric delay calculations is needed to improve the a...
Chapter
The use of low-cost GNSS stations for meteorological applications requires the modeling of ionospheric errors. Although low-cost dual-frequency receivers are now available, current ones are still missing the L2 frequency and this prevents the availability of iono-free observations. This second frequency can be predicted by exploiting dual-frequency...
Article
Full-text available
A prototype of a low-cost GNSS (Global Navigation Satellite System) monitoring system was installed on a deep-seated landslide in northwestern Slovenia to test its performance under field conditions. The system consists of newly developed GNSS stations based on low-cost, dual-frequency receivers and open-source GNSS processing software. It automati...
Article
Full-text available
Atmospheric Phase Screens (APSs) derived from Interferometric Synthetic Aperture Radar (InSAR) observations contain the difference between the tropospheric water vapor induced delay of two acquisition epochs, i.e. the slave and the master (or reference) epochs. Using estimates of the atmospheric state coming from independent sources, for example nu...
Article
Full-text available
A Synthetic Aperture Radar can offer not only an accurate monitoring of the earth surface deformation, but also information on the troposphere, such as the total path delay or the columnar water vapor at high horizontal resolution. This can be achieved by a proper interferometric processing and post-processing of the radar interferograms. The fine...
Presentation
Full-text available
Multipath mitigation approach implemented in goGPS. This presentation is a modified version of the previous presented in Luxembourg, here with improved descriptions and new figures for the EGU2020 General Assembly. The strategy uses Zernike polynomials interpolation and high-resolution gridding to compute multipath maps from the residuals of the G...
Presentation
Full-text available
Receiver antenna calibration plays an important role in precise point positioning (PPP). Correct management of multipath effects can improve the estimation of tropospheric parameters and the stability of the coordinates over short measurement sessions. In the years, many techniques have been developed to mitigate multipath effects, among them multi...
Article
Full-text available
The Mediterranean region is frequently struck by severe rainfall events causing numerous casualties and several million euros of damages every year. Thus, improving the forecast accuracy is a fundamental goal to limit social and economic damages. Numerical Weather Prediction (NWP) models are currently able to produce forecasts at the km scale grid...
Conference Paper
Full-text available
Global Navigation Satellite System (GNSS) have been routinely used in the last decades to estimate water vapor content in the lower part of the atmosphere. Water vapor measurements have been successfully integrated in Numerical Weather Prediction (NWP) models, showing a positive impact on the forecast of rain events. Since few years, it is possible...
Poster
Full-text available
Goal of the project was to investigate whether the assimilation of high resolution Earth Observation variables improve the forecast of heavy rain events. Several experiments were conducted assimilating soil moisture, surface wind, sea surface temperature, land surface temperature and zenith total delay. The assimilation of wind and water vapor cont...
Presentation
Full-text available
The new version of the open-source goGPS MATLAB software has been written to be a simple tool to perform efficient analysis of GNSS data from both geodetic and low-cost receivers. With its capability to download automatically all the resources needed by the selected algorithms, the relative easiness of use, and its flexibility with the possibility...
Poster
Full-text available
The activities carried out within the WP2 of the TWIGA-H2020 project are described. In particular, the following topics are covered: the definition of a new low-cost GNSS receiver network to be soon installed in Uganda, a new algorithm for the retrieval of water vapor maps from Sentinel-1 data and the ongoing numerical weather prediction experiment...
Article
Full-text available
GNSS atmospheric water vapor monitoring is not yet routinely performed in Italy, particularly at the regional scale. However, in order to support the activities of regional environmental protection agencies, there is a widespread need to improve forecasting of heavy rainfall events. Localized convective rain forecasts are often misplaced in space a...
Conference Paper
The STEAM (SaTellite Earth observation for Atmospheric Modelling) project, funded by the European Space Agency, aims at investigating new areas of synergy between high-resolution numerical weather prediction (NWP) models and data from spaceborne remote sensing sensors. An example of synergy is the incorporation of high-resolution remote sensing dat...
Poster
Full-text available
goGPS is a GNSS processing software written in MATLAB, that was originally developed for precise positioning purposes, mainly based on the double-difference relative approach. To broaden its use by including also tropospheric delay estimation, all the algorithms and procedures needed to apply PPP (Precise Point Positioning) were implemented. In add...
Poster
Full-text available
Regional gravity field modelling by means of remove - restore procedure is nowadays widely applied to predict grids of gravity anomalies in exploration geophysics. Considering this application, due to the required accuracy and resolution, airborne gravity observations are generally adopted. In this work a procedure to filter and grid raw airborne o...
Article
Regional gravity field modelling by means of remove-compute-restore procedure is nowadays widely applied in different contexts: it is the most used technique for regional gravimetric geoid determination, and it is also used in exploration geophysics to predict grids of gravity anomalies (Bouguer, free-air, isostatic, etc.), which are useful to unde...
Poster
Full-text available
The fifth release of the space-wise approach, as well as the ones of the direct and time-wise approaches, is based on the processing of the whole GOCE dataset, from November 2009 to October 2013. It consists in global grids of gravity gradients at 0.2°x0.2° spatial resolution and in a spherical harmonic model derived from these grids by a discretiz...
Conference Paper
Full-text available
Beside the traditional modelling of the Earth gravity field in terms of truncated spherical harmonic expansion, the final products of the GOCE mission include also grids of gravity gradients at satellite altitude, like for example the ones computed by the space-wise approach in the framework of the High-level Processing Facility (HPF). This is moti...
Conference Paper
Beside the traditional modelling of the Earth gravity field in terms of truncated spherical harmonic expansion, the final products of the GOCE mission include also grids of gravity gradients at satellite altitude, like for example the ones computed by the space-wise approach in the framework of the High-level Processing Facility (HPF). This is moti...
Conference Paper
Full-text available
GOCE data covering the mission phase at nominal satellite altitude (about 250 km) have been processed by the space-wise approach according to the new strategy for the production of global grids of gravity gradient gradients at 0.2°x0.2° resolution. The crucial points of the method are the filtering along the orbit in order to reduce variance and co...
Conference Paper
Full-text available
goGPS is a free and open source software package designed to enhance the accuracy of single frequency low-cost GPS devices by employing an extended Kalman filter. This filter can be applied either in post-processing or in real-time and it is specifically tailored for addressing the issues related to low-cost GPS receivers. To further enhance the ac...
Conference Paper
Full-text available
The new release of the ESA-GOCE data set, with improved calibration and processing, has been attacked by the space-wise approach according to a new strategy for the data gridding at satellite level. Two approaches are possible: the first exploiting the creation of about 30 global grids of 1,620,000 values, each corresponding to about 2 months of da...
Conference Paper
Full-text available
Riassunto L'obiettivo principale della missione satellitare GOCE dell'Agenzia Spaziale Europea (ESA) è la stima del campo gravitazionale terrestre con elevata accuratezza e risoluzione spaziale. Questa stima è solitamente espressa come una serie troncata di armoniche sferiche. Agli utenti vengono forniti i coefficienti della serie e la descrizione...
Conference Paper
Full-text available
The global height datum problem, that is the determination of biases of different height systems at global scale, is revised and two solutions are proposed. As it is well known, biased heights enter into the computation of terrestrial gravity anomalies, which in turn are used for geoid determination. Hence, these biases enter as secondary or indire...
Conference Paper
Full-text available
The main objective of the GOCE mission is to estimate the Earth gravity field from satellite data with high accuracy and resolution. This estimate is expressed by a truncated series of spherical harmonics, providing users with the series coefficients and their full error covariance matrix. This model, projecting the unknown potential on a finite gl...
Article
Regional height systems do not refer to a common equipotential surface, such as the geoid. They are usually referred to the mean sea level at a reference tide gauge. As mean sea level varies (by ±1 to 2 m) from place to place and from continent to continent each tide gauge has an unknown bias with respect to a common reference surface, whose determ...
Conference Paper
Full-text available
The global height datum problem, namely the determination of biases of different height systems referred to different origins (i.e. to different equipotential surfaces), is typically reduced to a least squares systems where GPS derived ellipsoidal heights are compared with orthometric heights and geoid undulations derived from suitable global model...
Conference Paper
Full-text available
In the framework of the GOCE data analysis, the space-wise approach implements a multi-step collocation solution for the estimation of a global geopotential model in terms of spherical harmonic coefficients and their error covariance matrix. The main idea is to use the collocation technique to exploit the spatial correlation of the gravity field in...
Conference Paper
Full-text available
Riassunto Il modello globale del campo di gravità terrestre calcolato con l'approccio space-wise è una delle tre soluzioni ufficiali rilasciate dall'ESA dall'analisi dei dati GOCE. Il modello consiste in una serie di coefficienti dello sviluppo in armoniche sferiche e nella corrispondente matrice di covarianza dell'errore di stima. La principale ca...
Conference Paper
Full-text available
The global gravity field model computed by the space- wise approach is one of three official solutions delivered by ESA from the analysis of the GOCE data. The model consists of a set of spherical harmonic coefficients and the corresponding error covariance matrix. The main idea behind this approach is to exploit the spatial correlation of the grav...
Article
The space-wise approach is a multi-step collocation procedure, developed in the framework of the GOCE HPF data processing for the estimation of the spherical harmonic coefficients of the Earth gravitational field and their error covariance matrix. The main idea of the space-wise approach is to perform this estimation by exploiting the spatial corre...
Conference Paper
Full-text available
Riassunto Dal 29 settembre 2009 il satellite GOCE è in modalità operativa e sta inviando a terra i dati acquisiti dagli strumenti a bordo, in particolare le derivate seconde del potenziale gravitazionale osservate dal gradiometro elettrostatico e i dati di tracciamento dell'orbita raccolti dal ricevitore GPS. Il processamento basato sull'approccio...

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Projects

Projects (5)
Project
The H2020 SINOPTICA (Satellite-borne and IN-situ Observations to Predict The Initiation of Convection for ATM) project aims at exploiting the untapped potential of assimilating remote sensing (EO-derived and ground-based radar) as well GNSS-derived datasets and in situ weather stations data into very high-resolution, very short-range numerical weather forecasts to provide improved prediction of extreme weather events to the benefit of ATM operations. This will be done by setting up a continuously updated database of remote sensing-derived, GNSS-derived and in situ weather stations variables, in combination with an automated assimilation system to feed an NWM. The usefulness of deploying dedicated networks of sensors to monitor atmospheric variables at high spatial resolution in the vicinity of ATM ""hotspots"" such as airports will be investigated as well. SINOPTICA weather forecast results will be integrated into ATM decision-support tools, visualizing weather information on the controller's display, and generating new 4D trajectories to avoid severe weather areas. The usefulness of the newly developed SINOPTICA tools will be monitored during the project and evaluated, thanks to the involvement of ATM stakeholders in the project consortium and advisory board. https://cordis.europa.eu/project/id/892362/it
Project
goGPS is a software created for processing GNSS raw data. It was originally written specifically to work with GPS single-frequency low-cost receivers but now it can fully exploit multi-constellation, multi-frequency, multi-tracking observations. In this project we will collect all the works aimed at the development of the software.
Project
The violence and frequency of extreme weather events is increasing. For this reason, improving the forecast accuracy is a fundamental goal to limit social and economic damages. In this scenario the STEAM project (SaTellite Earth observation for Atmospheric Modeling) aims to respond to a specific question asked by the European Space Agency (ESA): can be used satellite weather observation data to better understand and predict with at higher spatial-temporal resolution the atmospheric phenomena that can lead to extreme events? To verify this, STEAM has identified the "WRF model" as the best existing model and will feed it also with other variables observed by satellites of the Sentinel constellation such as humidity, soil and sea temperature, wind on the sea, the amount of water vapour in the atmospheric band closest to the earth. All these data are not normally used in atmospheric forecasting models, but they are taken into account more for hydrological and marine modelling. Many experiments will be carried out on leading edge cloud computing facilities both for the analysis of high impact meteorological events and for the study of turbulence phenomena of the lower atmosphere and the spatial inhomogeneity of the water vapour fields. These phenomena influence also the electromagnetic propagation earth-satellite and in this subject ESA has a natural interest.