# Daniele SampietroGeomatics Research & Development s.r.l. | GReD

Daniele Sampietro

Ph.D.

## About

94

Publications

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Introduction

In the framework of gravity field, my R&D activities aim to improve performances of airborne kinematic gravimetry/gradiometry in terms of accuracy and spatial resolution.
I'm working on the combination of different gravity observations in a multi-scale approach (delivering local grids of free air/Bouguer gravity anomalies).
I'm developing algorithms to estimate mass density distributions from gravity data coupled with geological information through different inversion methods.

Additional affiliations

January 2007 - December 2009

Education

October 2005 - October 2009

January 2004 - October 2005

## Publications

Publications (94)

In the present study, a Bayesian gravity inversion algorithm is applied to infer a complete 3D density model of the crust in the region of the Wilkes Land. One of the main objective of this work is to provide information on the thickening/thinning of the crust beneath the basin or the amount and characteristics of sediment deposits in the area. Aft...

The exploitation of gravity fields in order to retrieve information about subsurface geological structures is sometimes considered a second rank method, in favour of other geophysical methods, such as seismic, able to provide a high resolution detailed picture of the main geological horizons. Within the current work we prove, through a realistic sy...

The Central-Eastern Mediterranean region is known to be a complex area due to the interaction of four tectonic plates namely, Arabia, Africa, Anatolia and Eurasia and by the presence of an ancient oceanic crust in the Herodotus and Ionian Basin. The analysis of the available literature highlights that the distribution of the freely available geophy...

The knowledge of the gravity field has widespread applications in geosciences, in particular in Geodesy and Geophysics. The point of view of the paper is to describe the properties of the propagation of the potential, or of its relevant functionals, while moving upward or downward. The upward propagation is always a properly posed problem, in fact...

The Moho surface, namely the density discontinuity between crust and mantle, is traditionally studied by seismic methods. However, gravity information can contribute to the Moho estimation and, more generally, to the crustal modeling. The contribution is twofold. First, gravimetry generally provides observations with much lower errors than those im...

The study of the discontinuity between crust and mantle beneath Iran is still an open issue in the geophysical community due to its various tectonic features created by the collision between the Iranian and Arabian Plate. For instance in regions such as Zagros, Alborz or Makran, despite the number of studies performed, both by exploiting gravity or...

To solve the inverse gravimetric problem, i.e., to estimate the mass density distribution that generates a certain gravitational field, at local or regional scale, several parameters have to be defined such as the dimension of the 3D region to be considered for the inversion, its spatial resolution, the size of its border, etc. Determining the idea...

The two layers inverse gravimetric problem is to determine the shape of the two layers in a body B, generating a given gravitational potential in the exterior of B. If the constant density of the two layers is given, the problem is reduced to the determination of the geometry of the interface between the two. The problem is known to be ill posed an...

Gravimetric methods are expected to play a decisive role in geophysical modeling of the regional crustal structure applied to geoneutrino studies. GIGJ (GOCE Inversion for Geoneutrinos at JUNO) is a 3-D numerical model constituted by ~46 × 10 ³ voxels of 50 × 50 × 0.1 km, built by inverting GOCE (Gravity field and steady-state Ocean Circulation Exp...

Gravimetric methods are expected to play a decisive role in geophysical modeling of the regional crustal structure applied to geoneutrino studies. GIGJ (GOCE Inversion for Geoneutrinos at JUNO) is a 3D numerical model constituted by ~46 x 10$^{3}$ voxels of 50 x 50 x 0.1 km, built by inverting gravimetric data over the 6{\deg} x 4{\deg} area center...

The determination of the oceanic Moho (or crust-mantle) density contrast derived from seismic acquisitions suffers from severe lack of data in large parts of the oceans, where have not yet been sufficiently covered by such data. In order to overcome this limitation, gravitational field models obtained by means of satellite altimetry missions can be...

Airborne gravimetry is becoming nowadays more and more important: it is used for the computation of high accurate local geoid modelling, for resource exploration activities, as well as for the study of different geophysical topics. The above-mentioned applications usually require different accuracies and spatial resolutions.
In the current work we...

Airborne gravimetry represents nowadays probably the most efficient technique to collect gravity observations close to the Earth's surface. In the 1990s, thanks to the development of the Global Navigation Satellite Systems (GNSS), which has made accurate navigational data available, this technique started to spread worldwide because of its capabili...

The study of the discontinuity between the Earth crust and upper mantle, the so-called Moho, and of the lithospheric architecture in general, has several important applications in exploration geophysics. For instance, it is used to facilitate the inversion of seismic-related data, in order to obtain important information on the sedimentary layers o...

Full text can be find at the following link:
https://link.springer.com/referenceworkentry/10.1007/978-3-662-46900-2_93-1
The knowledge of the gravity field has widespread applications in geosciences, in particular in Geodesy and Geophysics. The point of view of the paper is to describe the properties of the propagation of the potential, or of its...

Within the modelling of gravity data, a common practice is the upward/downward continuation of the signal, i.e. the process of continuing the gravitational signal in the vertical direction away or closer to the sources, respectively. The gravity field, being a potential field, satisfies the Laplace’s equation outside the masses and this means that...

The precise computation of the vertical gravitational attraction of the topographic masses (terrain correction) is still being studied both for geodetic and geophysical applications. In fact, it is essential in high precision geoid estimation by means of the well-known remove-compute-restore technique, which is used to isolate the gravitational eff...

The recent access to GNSS (Global Navigation Satellite System) phase observations on smart devices, enabled by Google through its Android operating system, opens the possibility to apply precise positioning techniques using off-the-shelf, mass-market devices. The target of this work is to evaluate whether this is feasible, and which positioning acc...

Flight height is a fundamental parameter for correcting the gamma signal produced by terrestrial radionuclides measured during airborne surveys. The frontiers of radiometric measurements with UAV require light and accurate altimeters flying at some 10 m from the ground. We equipped an aircraft with seven altimetric sensors (three low-cost GNSS rece...

We present a combined method for estimating a new global Moho model named KTH15C, containing Moho depth and Moho density contrast (or shortly Moho parameters), from a combination of global models of gravity (GOCO05S), topography (DTM2006) and seismic information (CRUST1.0 and MDN07) to a resolution of 1° × 1° based on a solution of Vening Meinesz-M...

The Kermadec-Tonga subduction zone is studied, starting from the CRUST1.0 and the SLAB1.0 seismic models, and inverting the ESA-GOCE gravity gradients to improve our knowledge of the whole area. More specifically, the CRUST1.0 Moho discontinuity is refined, and the subducting plate is modelled for thickness and density contrast, since SLAB1.0 provi...

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...

The study of reservoir behaviour is an important topic when dealing with the removal or the injection of fluids into the underground (e.g. hydrocarbon production or natural gas storage). The monitoring of surface deformations provides a valid contribution to the analysis of the reservoir. Nowadays the InSar technique is one of the most commonly use...

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...

The computation of the vertical attraction due to the topographic masses, the so-called Terrain Correction, is a fundamental step in geodetic and geophysical applications: it is required in high-precision geoid estimation by means of the remove–restore technique and it is used to isolate the gravitational effect of anomalous masses in geophysical e...

Underground caves bear a natural hazard due to their possible evolution into a sink hole. Mapping of all existing
caves could be useful for general civil usages as natural deposits or tourism and sports. Natural caves exist globally and are typical in karst areas. We investigate the resolution power of modern gravity campaigns to systematically det...

The EGM2008 model is nowadays one of the description of the global gravitational field at the highest resolution. It is delivered with two, not fully consistent, sources of information on its error: spherical harmonic coefficient variances and a geographical map of error variances, e.g. in terms of geoid undulation. In the present work, the gravity...

GOCE observations are an extremely innovative and useful product for the study of the Earth crust at regional and global scales: from the one hand they give a practically error-less constraint to verify crustal models, from the other hand combining GOCE gravity observations with seismic data and considering additional information it is possible to...

TOPOGRAPHIC SIGNATURE OF THE MANTLE.

The GAL (Galileo for Gravity) project, founded by the European GNSS Agency (GSA) in the framework of the FP7 Transport theme aims to study and develop a state-of-art methodology for the determination of precise and high-resolution gravity field models from strapdown kinematic airborne gravimetry. In this work, the procedure applied in the framework...

In the present work we illustrate a new local inversion algorithm to retrieve the Moho depth from GOCE (Gravity field and steady-state Ocean Circulation Explorer) gravity field. In details the proposed procedure can be divided into two main steps: the first one consists in recognizing and isolating the different geological provinces in the study ar...

Collocation approach has been applied to get a global Moho model in spherical approximation based on a GOCE geopotential model. A simple single layer model, with known density contrast, has been considered and a linearized relationship between the spherical harmonic coefficients of the anomalous potential and those of the Moho depth has been derive...

It is well known that the inverse gravimetric problem is generally ill-posed and therefore its solution requires some restrictive hypotheses and strong numerical regularization. However, if these initial assumptions are improperly used, the final results could be theoretically and physically admissible but far from the actual mass density distribut...

Via Appia was built by the Romans around 312 BC to connect Rome with Capua during the Samnite wars. The road is an astonishing engineering masterpiece. In particular, the segment which runs from Collepardo to Terracina – 61 km long – is renowned for being virtually straight; however such a “straightness” was never investigated quantitatively. As a...

Sommario L'uso di tecniche di compensazione che combinino misure topografiche classiche ed osservazioni GNSS all'interno della stessa rete facilita il rilievo di punti sparsi su ampie superfici garantendo un'elevata accuratezza ed una maggiore precisione della stessa. Tra le possibili applicazioni che possono beneficiare di questa combinazione c'è...

Gravity observations are a powerful means for detecting underground mass changes. The Italian and Slovenian Karst has a number of explored caves, several are also touristic due to their size (e.g. Grotta Gigante in Italy; Skocjianske Jame and Postojnska Jama in Slovenia). Just a few years ago another big cave was discovered by chance close to Tries...

In the GEMMA project, funded by ESA-STSE and ASI, a new crustal model constrained by GOCE gravity field observations has been developed. This model has a resolution of 0.5°×0.5° and it is composed of seven layers describing geometry and density of oceans, ice sheets, upper, medium and lower sediments, crystalline crust and upper mantle. In the pres...

The boundary between Earth's crust and mantle is commonly modelled as a discontinuity surface, the so-called Moho. Although in some regions of the world this model may be too approximate or even unrealistic, globally speaking it can provide a key to read several long wavelength geophysical signals. Recent research activities have shown the possibil...

A better understanding of the physics of the Earth’s interior is one of the key objectives of the ESA Earth Explorer missions. This work is focused on the GOCE mission and presents a numerical experiment for the Moho estimation under the Tibet-Quinghai Plateau and the Himalayan range by exploiting the gravity data collected by this mission. The gra...

The boundary between Earth crust and mantle, the so called Moho, is commonly estimated by means of seismic or gravimetric methods. The former methods can be locally very accurate since seismic profiles give an almost direct observation of the actual crustal structure, but can be quite far from reality in large regions where no data are available.
T...

National geoids of neighbouring countries usually do not fit to each other along the borders. This problem is mainly due to inconsistencies between the national reference frames used to estimate local geoids: it is well known that a change in the height datum and in the reference ellipsoid causes systematic effects in terms of geoid undulation. The...

Via Appia, built around 312 BC, is an engineering masterpiece, its most striking feature being the segment between Colle Pardo and Terracina, which goes “straight” for about 61 km. We investigate this segment by GPS techniques: results lead to uncover that the original project of the road was based on a complex interplay between geometry and astron...

Different combinations of the EGM2008 global model and the GOCE space-wise solution are used to estimate the geodetic mean dynamic topography and the corresponding surface geostrophic circulation of the Mediterranean Sea. In order to assess the accuracy of the GOCE-derived products for oceanographic applications, the mean currents obtained from the...

Neighbouring countries often have national geoids that do not fit to each other, typically showing a discontinuity along the border. Among other effects, this discontinuity is mainly due to the different height datum, producing biased local geoids which can also have different accuracies and spatial resolutions. In some applications, for instance i...

The most advanced global gravity model, EGM2008, is nowadays competing with local models in terms of resolution and accuracy in the definition of the Earth gravity field. This global model, complete to spherical harmonic degree and order 2159, is however affected by several biases mainly due to datum inconsistencies and variability of the input obs...

The discontinuity surface between Earth crust and mantle, the so-called Moho, is commonly estimated by means of seismic or gravimetric methods. Usually these methods do not yield the same result since they are based on different geological and geophysical hypotheses, as well as different data types, also in terms of quality and spatial distribution...

HELI-DEM: integrazione dei dati di altezza transalpini fra Italia e Svizzera
HELI-DEM è stato un intervento cofinanziato con risorse PO Italia-Svizzera 2007-2013 Fondo Europeo di Sviluppo Regionale, di natura scientifica, tecnologica ed applicativa di interesse nazionale ed internaziona- le. I suoi obiettivi principali erano di produrre un modello...

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...

The use of gravity data to globally estimate the depth of the separation
surface between Earth crust and mantle (Moho) is nowadays becoming more
and more important thanks to the availability of GOCE observations. In
particular in the GEMMA project (GOCE Exploitation for Moho Modeling and
Application), funded by ESA-STSE and ASI, a new crustal model...

Many ancient cultures planned and constructed long, straight roads, sometimes taking an uttermost care of their "going straight". In many cases, interesting geometrical and astronomical methods were applied to gain an astonishing accuracy. As it turns out, this "desire of going straight" was not always due to practical purposes but rather to symbol...

Riassunto L'uso congiunto di ricevitori GNSS e stazioni totali, oggi sempre più frequente, pone il problema dell'integrazione di osservazioni classiche e GNSS e dei rispettivi sistemi di riferimento. Il software GeoNet, sviluppato da studenti, giovani ricercatori del Laboratorio di Geomatica del Politecnico di Milano in collaborazione con lo spin o...

The GOCE mission, exploiting for the first time the concept of satellite gradiometry, promises to estimate the Earth’s gravitational field from space with unprecedented accuracy and spatial resolution. Also inverse gravimetric problems can get benefit from GOCE observations. In this work the general problem of estimating the discontinuity surface b...