Presentazione della SEZIONE GEODESIA E GEOMATICA

Dipartimento di Ingegneria Civile e Ambientale

Commissione Scientifica, 10 Ottobre 2013

The GOCE mission

SEDI

Campus Leonardo (Edificio3)

Polo di Como (Via Valleggio)

DOCENTI

• Alberta Albertella

• Riccardo Barzaghi

• Barbara Betti

• Ludovico Biagi

• Maria Antonia Brovelli

• Daniela Carrion

• Federica Migliaccio

• Livio Pinto

• Mirko Reguzzoni

• Giovanna Sona

• Giovanna Venuti

• Fernando Sansò

(Retired 01.01.2014)

Personale Tecnico

• Marco Negretti

• Lucio Pallottino

• Maurizio Spagnoli

• Vincenza Tornatore

• Cinzia Vajani

Assegnisti di Ricerca

Dottorandi

Collaboratori (e.g. CoCoCo)

Alberta Albertella

PR Federica Migliaccio PA

Riccardo Barzaghi

PO Livio Pinto Responsabile di Sezione

PA

Barbara Betti

PO Mirko Reguzzoni PR

Daniela Carrion

PR Vincenza Tornatore EP

Sezione Geodesia e Geomatica SSD ICAR/06 Topografia e cartografia

Campus Leonardo (Edificio 3)

Ludovico Biagi

PR Giovanna Sona PR

Maria Antonia Brovelli

PO Giovanna Venuti PR

Fernando Sansò Retired 01.01.2014

PO Marco Negretti

Sezione Geodesia e Geomatica SSD ICAR/06 Topografia e cartografia

Polo di Como (Via Valleggio)

The GOCE mission

attività dell’International Service for the Geoid (ISG)

The original concept of GOCE data analysis by means of the space-wise

approach has been recognized by ESA as an official GOCE data

reduction scheme for the production of a GOCE Earth gravity field model.

The second derivatives of the gravity potential are measured by means of a set of accelerometers. The gravity field obtained with GOCE

data are the most accurate and attain

the highest uniform spatial coverage

and resolution ever obtained before.

The GOCE mission

Wiener

filter

SGG

data local

gridding

harmonic

analysis

SST

prior

model

model

coeffs

space-wise solver

filtered data gridded data

+ -

SST

prior

model

+

along track

synthesis

Wiener filter and GRF/LORF

corrections

The space-wise approach is a multi-step collocation procedure:

- data filtering along the orbit (Wiener filter) with iterative corrections,

- data gridding at satellite altitude (LS collocation),

- spherical harmonic analysis (numerical integration).

The Polimi space-wise approach for the GOCE mission

6.00 8.00 10.00 12.00 14.00 16.00 18.0036.00

38.00

40.00

42.00

44.00

46.00

The high precision Italian geoid (4 cm precision)

The Italian geoid estimate

International Service for the Geoid (ISG) (formerly IGeS, founded 1992)

http://www.isgeoid.polimi.it/

International Service for the Geoid: OBJECTIVES

- collect geoid estimates worldwide,

- collect, test and, when allowed, distribute software for the geoid determination,

- conduct researches on methods for the geoid determination,

- organize schools on geoid determination,

- issue, at least once per year, the Newton’s Bulletin,

- disseminate special publications on geoid,

- support Agencies or scientists in computing regional geoids.

- METHODS AND TOOLS FOR MERGING LOCAL GEOID SOLUTIONS

- ANALYSES ON GLOBAL HEIGHT DATUM

- PLANS FOR NEW GEOID SCHOOLS (WITH BGI)

- NEW PROJECT FOR THE GEOID IN THE MEDITERRANEAN SEA

RECENT ACTIVITIES

Latest editions of Schools on geoid computation

- Politecnico di Milano, Como, Italy, September 15th -19th , 2008.

- Universidad Nacional de la Plata, Facultad de Ciencias Astronómicas

y Geofísicas, La Plata, Argentina, September 7th -11th , 2009.

- Research Institute ELEKTROPRIBOR, S.Peterburg, Russia, June 28th-

July 2nd, 2010.

- Universidad Técnica Particular de La Loja, Ecuador,

October 7th -11th , 2013 (11th International Geoid School).

Participants to the 1st International Geoid School, Milano, 10 - 14 October 1994

GPS Lombardia users

increase from 2005 to 2010

The Lombardia GPS-RTK network

-The network was designed and realized under the supervision of DIIAR

-18 GPS permanent GPS stations connected to a computing center

-It allows for precise positioning (5-6 cm precision) - It is the first network for real time applications in Italy

Permanent GPS networks for deformation monitoring

ALPS-GPSQUAKENET project

- The network has been designed for monitoring the

deformation of the Alpine area

- More than 35 GPS permanent stations have been

processed at DIIAR

The Pollino Network

Monitoring of the deformations

related to the Castrovillari fault

(Pollino seismic gap)

Non-permanent GPS networks

for deformation monitoring

Geodetic link from CERN to INFN GS lab

CERN

730 km

INFN GS

INFN Gran Sasso Laboratories

Two semi-permanent GPS Networks ( )

a) Tunnel entrance (L’Aquila)

b) Tunnel entrance (Teramo)

It is necessary to know the entry point

coordinates and the two orientation points.

Perm. GPS Ant.

Tunnel (10.5 km)

TERAMO

L’AQUILA

Tunnel measurements

Theodolite TS 30 Leica

Angular rms = 0.5”

Distance rms = 0.5 mm + 0.5 ppm

DATUM WGS84

3D Coordinates

Traverse survey

Trellis pattern: 250/500 m

distance between points.

500 m

1-2

m

Geodetic survey at INFN GS lab

Tunnel measurements

500 m

1-2

m

Geodetic survey at INFN GS lab

Theodolite TS 30 Leica

Angular rms = 0.5”

Distance rms = 0.5 mm + 0.5 ppm

Accuracy

GPS baseline CERN - INFN = 1 cm

Traverse survey = 3 cm

Point inside the lab = 2-3 cm

Total acc. less than 4 cm Close Traverses

Geodetic survey at INFN GS lab

GNSS as a remote sensing system

for atmospheric sounding

ESA funded project METAWAVE, currently also in cooperation with the

RISH institute of Kyoto

Electromagnetic signals are delayed by the water vapor presence in the low

layers of the atmosphere

estimates of these delays can be used to retrieve the

troposphere water vapor content.

Results of a statistical analysis on the zenith delays retrieved by a network of

GNSS receivers located in Kyoto, as compared with analogous quantities

derived from other sensors.

Villa Castelbarco

3D reconstruction from

photogrammetric takens and

topographic survey.

3D bas-relief reconstruction

with AGIsoft photoscan.

Photogrammetry: 3D Reconstruction

Multispectral images from UAV

Test areas

Medolago (BG) ;

Cisano (Bg) – Parco Adda Nord

Objective

classification study for

recognizing non-native plants

• Microdrones MD4-200.

• Since June 2012 GG owns Mikrokopter.

• Multispectral images.

• Different payloads (Pentax Optio AD40,

Sigma DP1, Tetracam ADC Lite).

GIS applications Design of a georeferenced DB (relational model) for a shared database

of underground utility lines for 3D mapping and GIS applications

GIS applications Design of a georeferenced DB (relational model) for a shared database

of underground utility lines for 3D mapping and GIS applications

GIS applications

Structuring a georeferenced DB and implementing a GeoService for

historical research

GIS applications - WebGIS

Structuring a georeferenced DB and implementing a GeoService for

historical research

WebGIS – 3D and 4D applications

4D representation of variables (3D location of the variable values at

different times) provided in netCDF format.

The tool is based on the Free and Open Source Java NASA World Wind

virtual globe.

WebGIS – crowdsourcing

http://geomobile.como.polimi.it/segnalazioni_buche/istruzioni.html

An application which allows anyone to report road pavement damages events by

means of an Android device (e.g. smartphones and tablets) and to exploit the

device on-board sensors (GPS receiver and camera) to send georeferenced

images related to the road pavement damage events.

Data are stored inside a database, Web-published through standard protocols

and finally accessed in a dedicated WebGIS.

HeliDEM

The project was funded by the European Regional Development Fund within the

Italy-Switzerland cooperation program.

A unique DTM for the alpine and subalpine area between Italy (Piedmont and

Lombardy) and Switzerland (Ticino and Grisons Cantons) has been computed

starting from data acquired from different DTMs, in different reference frames

and obtained with different technologies, accuracies, and resolutions.

HELvetia-Italy Digital Elevation Model project

http://www.helidem.eu/

GReD http://www.g-red.eu/

GReD is a newly established Politecnico di Milano Spin-off which, based on

geomatics technologies, studies and designs innovative solutions, in:

• advanced surveying and cartography,

• augmented GNSS,

• high precision high resolution gravimetry,

• space applications.