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Federica Migliaccio

Federica Migliaccio
Politecnico di Milano | Polimi · Deptartment of Environmental, Hydraulic, Infrastructures and Surveying Engineering

Ph. D.

About

100
Publications
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1,054
Citations

Publications

Publications (100)
Article
Full-text available
During a disaster, the activity of the crowd represents a very valuable source of the on-the-ground conditions shared by the affected citizens. The approach, presented in the paper, explores the relationship between the spatial distribution of crowdsourced image posts and damaged buildings in order to understand the potential of modelling the spati...
Article
Full-text available
Social media could be very useful source of data for a people interested in disasters, since it can provide them with on-site information. Posted georeferenced messages and images can help to understand the situation of the area affected by the event. Considering this type of resource as a real-time crowdsource of crisis information, the spatial di...
Article
Full-text available
Social media data, such as Instagram posts, can be associated with spatial positions. This information can be exploited to perform spatial analyses, such as identifying distribution patterns of points representing the positions of social media users during an emergency or while attending a specific event or exhibition. However, the geolocation prov...
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...
Article
Physical geodesy is by definition the science which studies and calculates the Earth’s gravity field and its physical form. Satellite physical geodesy exploits satellite techniques to solve the problems established in physical geodesy. During the second half of the twentieth century, satellite techniques allowed to make outstanding advances in the...
Conference Paper
Full-text available
For the purpose of facility management it is very important to have detailed and up-to-date databases of underground utility lines, but such data are not always available with adequate accuracy. Hence, the need of collecting and organizing suitable information on underground services is a fundamental issue when dealing with urban data. Besides, by...
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 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
Full-text available
CO emissions due to biomass burning can be represented as raster maps computed from satellite observations obtained from sensors of different types, on board of different platforms, exploiting algorithms which combine input data in different ways. Hence, different CO emission “products” are available and it is important to define comparison tools a...
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...
Article
Full-text available
Three gravity field models, parameterized in terms of spherical harmonic coefficients, have been computed from 71 days of GOCE (Gravity field and steady-state Ocean Circulation Explorer) orbit and gradiometer data by applying independent gravity field processing methods. These gravity models are one major output of the European Space Agency (ESA) p...
Article
Full-text available
The increasing availability of data monitoring the phenomena that occur on the Earth makes it necessary to provide ad hoc tools allowing the researchers to exploit efficiently all information. The study presented in this paper has been dedicated to the design and implementation in a GIS environment of tools and indices for the analysis and inter-co...
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...
Article
Full-text available
In the framework of Land Planning and Management activities, a database including a large variety of datasets of heterogeneous typology and acquisition is fundamental in order to allow for diversified queries and efficient selection of data. Local municipalities (and unions or consortia of municipalities) in Regione Lombardia are encouraged to crea...
Article
The space-wise approach is a multi-step collocation procedure, developed in the framework of the GOCE HPF (High Level Processing Facility) data processing, for the estimation of the spherical harmonic coefficients of the Earth's gravitational field and their error covariance matrix. The final solution of this approach is based on both the satellite...
Conference Paper
Full-text available
The aim of the data analysis of the GOCE satellite mission is to estimate spherical harmonic coefficients of the gravitational potential and the corresponding error covariance matrix. However this error estimation is generally very complicated and computationally demanding because of the large number of observations. In particular, this is true for...
Article
Geophysical events implying a large mass displacement especially in the vertical direction can produce a localized change of the Earth gravity field. The Sumatra earthquake of 2004 December is an example of this kind of geophysical phenomena. The aim of this work is to investigate the possibility of detecting such gravimetric changes by exploiting...
Conference Paper
Full-text available
A new set of E2E (end-to-end) simulated data for the GOCE mission has been recently produced by the European Space Agency and used for extensive testing of the procedures for the estimation of the gravity field. These data set spans 60 days and includes the satellite state vector data and orientation parameters, the measured gravity gradients and t...
Article
This paper describes the activities carried out by a working group that comprises the Civil Protection Department of Regione Piemonte, Altec S.p.A. (Advanced Logistic Technology Engineering Center) and Politecnico di Milano, regarding the exploitation of GOCE data for a local estimate of gravity field and geoid in the Piemonte area. The idea of the...
Chapter
GOCE will be the first satellite gradiometric mission with the purpose of estimating the stationary gravitational field to a high accuracy and spatial resolution. The on-board gradiometer will provide measurements of the second derivatives of the gravitational potential along the instrumental axes, which are used together with the satellite trackin...
Conference Paper
Full-text available
A mission for monitoring the variations of Earth's gravity field at high resolution (up to harmonic degree 200) over a long time period (>5 years) has been defined within the "Laser Doppler Interferometry Mission for Determination of the Earth's Gravity Field" study for the European Space Agency. The mission exploits the use of a hetero- dyne laser...
Conference Paper
Full-text available
In the framework of the space-wise approach for the GOCE data analysis an intermediate step of prediction of functionals of the gravitational potential on a regular spherical grid is performed. The purpose of this procedure is to filter the observations in a space-wise sense. The gridding procedure is made by collocation over local patches of obser...
Conference Paper
Full-text available
This paper describes the activities carried out by a working group that comprises the Civil Protection Department of Regione Piemonte, Altec S.p.A. (Advanced Logistic Technology Engineering Center) and Politecnico di Milano, regarding the exploitation of GOCE data for a local estimate of gravity field and geoid in the Piemonte area. The idea of the...
Article
Full-text available
The space-wise approach to GOCE data reduction exploits the spatial correlation of the observations by " projecting " them on a spherical grid at mean satellite altitude; to this aim a local collocation prediction based on a global covariance function of the potential T can be used. Since the implicit hypothesis of rotational invariance is not fulf...
Article
Full-text available
For many years, the gravity field of the Earth was only seen by satellite geodesy as the main factor affecting the orbit and consequently it was retrieved together with a number of other orbital perturbations. Since the advent of a new generation of accelerometers, non-gravitational perturbations can be separated from the gravity effects and a new...
Conference Paper
Full-text available
In Brief: The " GOCE Italy " group was established at the end of 1999, focussing on the ESA mission GOCE. The activities carried on within " GOCE Italy " give to the participating groups (and to ASI) the opportunity to exploit Italian competences in the field of gravity gradiometry researches and to play a role in all the scientific topics of the m...
Conference Paper
Polar gaps effects, gridding effects and noise propagation from GOCE T rr data into harmonic coefficients estimates, by the so-called space-wise approach, have been extensively studied. To this aim two techniques are possible, namely the fast spherical collocation and the numerical integration. Recently the conclusion has been drawn that the two me...
Conference Paper
Full-text available
Many years ago the problem was addressed in satellite geodesy whether the collocation scheme based on covariances estimated on the rotation group, under the hypothesis of stochastic invariance of the underlying random field, could be directly applied to the time-wise data analysis, which should be typically based on a prior hypothesis of time stati...
Article
Full-text available
The space-wise approach to the analysis of satellite borne data, e.g. from the gradiometric mission GOCE, amounts to analysing such data in a way similar to the solution of a boundary value problem. This can be done indeed in several ways, for instance by applying numerical integration formulae, when the boundary functionals have relatively simple...
Article
The spacewise approach to GOCE data analysis consists in converting the problem of gravity model estimation into a solution of a boundary value problem for a ``sphere'' at satellite altitude; to this aim two approaches have been proposed. One is a Fast Spherical Collocation algorithm, which assimilates in a statistical mode a prior knowledge on the...
Article
Full-text available
Working Group on Measurements and Methods of Hight Precision Space Geodesy - ASI Research (1998-1999-2000)
Article
Full-text available
An artificial satellite, flying in a purely gravitational field is a natural probe, such that, by a very accurate orbit determination, would allow a perfect estimation of the field. A true satellite experiences a number of perturbational, non-gravitational forces acting on the shell of the spacecraft; these can be revealed and accurately measured b...
Article
Full-text available
The paper deals with the problem of treating realistic GOCE data, filtered by a measurement bandwidth window applied to the time-wise stream of data. For the moment we are concentrating on the second radial derivative of the anomalous potential (Trr), since these data are the most informative and the easiest to treat analytically.
Article
Full-text available
 In the framework of a boundary value problem (BVP), when areas on the boundary are void of data the solution of the problem becomes undetermined and clearly more difficult. Physically, this could be the situation in which a gradiometer on a satellite on a perfectly circular orbit covers a sphere with measured second radial derivatives: if the sate...
Chapter
The software elements able to produce GOCE products using either Least Squares Collocation (LSC) or the Integration approach are described. The software should be made available using a distribution system and the quality standards developed in the EU project MANICORAL. A number of problems remain unsolved, and require further investigations and so...
Chapter
The scope of WP 1 (undertaken by UCPH and POLIMI) was intended as a preparatory work for further studies along the line of the data reduction strategy based on the space-wise approach. The whole concept of the approach is to use the spatial correlation of the eld of the measurements, inherited from the correlation of the anomalous potential, to ass...
Chapter
In WP4 the problem of quality assessment for GOCE data has been studied. Basically, procedures for outliers detection and removal have been identiied, from two diierent points of view. In Sec. 4.1 the problem was studied in a track-wise approach, by the group of POLIMI. In Sec. 4.2 the problem was studied in an area-wise approach by C.C.Tscherning...
Chapter
The scope of WP 1 (undertaken by UCPH and POLIMI) was intended as a preparatory work for further studies along the line of the data reduction strategy based on the space-wise approach. The whole concept of the approach is to use the spatial correlation of the eld of the measurements, inherited from the correlation of the anomalous potential, to ass...
Chapter
In WP4 the problem of quality assessment for GOCE data has been studied. Basically, procedures for outliers detection and removal have been identiied, from two diierent points of view. In Sec. 4.1 the problem was studied in a track-wise approach, by the group of POLIMI. In Sec. 4.2 the problem was studied in an area-wise approach by C.C.Tscherning...
Chapter
Many different satellite missions are in project at the moment to estimate the global gravity field of the earth and its time variations. The principles of measurement are basically three, namely: the measurement of accurate orbit anomalies and of non gravitational forces acting on the satellite; the measurement of differential orbit anomalies and...
Chapter
SAGE is a project for a satellite accelerometric mission aimed at deterniining with high precision the low-medium coefficients of the earth gravity field and their time variations. In the international panorama, SAGE would be a prosecution of CHAMP, both in time (in case of approval, SAGE launch date would be within the year 2001) and in space (SAG...
Article
Presented at the Workshop "International cooperation and technology transfer", Feb.15-19, 1999, Parma, Italy
Article
Full-text available
This paper follows another one by the same authors ([7]), where the principle of a stochasticprobabilistic approach to the problem of cluster analysis was illustrated both from the theoretical point of view and by means of simulated and real-case examples. In the above cited paper the mono-dimensional case was treated (see also f8g), whereas we wan...
Article
Full-text available
After a call for proposals from the Italian Space Agency (ASI), for small satellite missions a group of Italian research teams and industries, led by the Politecnico di Milano conceived SAGE. This mission aims at determining the gravity field of the Earth by means of high-low SST, in other words the satellite orbit is determined by GPS, while the n...
Article
Full-text available
Cluster analysis can be seen as a set of procedures which allow to subdivide sets of data into groups with homogeneous characteristics. From our point of view, it is mostly fruitful to use a statistical model for the data. This means that the problem of cluster analysis can be defined in the following way: to estimate a distribution which is a «mix...
Conference Paper
A summary on numerical cartography and digital photogrammetry, taking into account also some aspect of GIS’s and image processing, is presented, in order to list the principal problems of spatially referenced data analysis. As it is very well known, reliability and robustness are important properties, that may be assured in the data analysis by usi...
Article
Full-text available
The STEP mission has been proposed to ESA as a mission for fondamenta! physics aimed at verifying thè equivalence principle; in more recent years however it was realized that thè same mission could serve for geodetic purposes, namely for thè high resolution determination of thè gravity field of thè earth. The dates important for thè mission are: 19...
Article
Full-text available
A new satellite gradiometric mission is under study in these days at thè European Sj Agency. This mission is considered as a follow on of thè abandoned Aristoteles mission, after parenthesis of thè study on thè possibility of exploiting a fundamental physics mission, STEP, for geodetic purposes; thè name of thè new mission is GEM, Gravity Explorer...
Article
Full-text available
This Report is split in 3 paragraphs: thè first is just to recali thè main topics treated in thè previous part of thè work, while paragraphs 2, 3 contain new materia! never presented before. In §2 numerica! tests are reported showing thè aliasing effect in thè least squares estimation approach; in §3 few examples of numerical potential reconstituti...
Article
Full-text available
In thè Aristoteles misslon we measure thè tensor r = V + fl + n (V = gravity gradients tensor, n = satellite's spin tensor)' along certain instrumentai axes and we transforra such measurements to a locai geographical frame (z radiai, x to north and y to cast) ; to perform this computation we need to know thè attitude of thè satellite i.e. thè rotat...
Chapter
Over the past 20 years scientists in the fields of oceanography, solid-earth physics and geodesy joined efforts to establish a low-flying gravity field mission in order to obtain an important objective: the resolution of the spatial variations of the gravity field to 100 km half wavelenght. Nevertheless, though many concepts were studied (SLALOM, G...
Conference Paper
Full-text available
Over the past 20 years scientists in the fields of oceanography, solid-earth physics and geodesy joined efforts to establish a low-flying gravity field mission in order to obtain an important objective: the resolution of the spatial variations of the gravity field to 100 km half wavelenght. Nevertheless, though many concepts were studied (SLALOM, G...