Cadastral cartography, born after unification of Italy in 1870, is an important source of large scale geographic information. Cadastral maps represent the result of the largest scale survey of on the whole national territory. Because of their large scale, their creation is extremely expensive and the updating of the cadastre claim considerable funds from the state budgets. That’s why the coordinate system, the geodetic basis of a cadastral work, is rarely changed. Even if Gauss-Boaga grid system based on ROMA40 datum was introduced and applied at some smaller parts of the country, the cartographic coordinates manly used in the cadastral maps are based on CassiniSoldner projection and cadastral datum Bessel-Genova; Bessel_Monte Mario and Bessel Castanea delle Furie. In the Cassini-Soldner projection, the whole Italian territory is subdivided in 31 major ("grandi origini") and more than 800 local ("piccole origini") cadastral systems. Nowadays, it is fundamental the implementation of a fast and free procedure for the updating of cadastral maps from Italian cadastral datum to modern WGS84. The two main goals of this paper are: the identification of a suitable set of points with coordinates known in both datums and the computation of Abridging Molodensky parameters from Cassini-Soldner cadastral datum to WGS84. The test area selected is the district of Rome called “Città metropolitana di Roma Capitale” . The data set of points suitable for the least-square estimation is extracted from the information available on the website www.globogis.it/fiduciali.it. The "globogis" database includes a selection of trigonometric points, with coordinates expressed in the WGS84 datum, and a selection of cadastral points ("punti fiduciali") with coordinates expressed in the Bessel-Genova 1902 datum. The whole database is analysed in order to provide the correct association between cadastral and trigonometric points. Known the dataset of points, the Abridging Molodensky parameters are estimated with a least square principle using a specific package developed by Prof. Timar. The estimated parameters are implemented and tested in the open source software QGIS. The accuracy of Abridging Molodensky parameters is tested using an independent set of point with respect to the estimation points.

Proposal of an abridged procedure to manage Cadastral maps in an open GIS package / Baiocchi, Valerio; Ceglia, Antonio; Deligios, Marco; Giannone, Francesca; Timar, Gabor; Chianese, Antimo. - ELETTRONICO. - 1:(2017), pp. 70-70. (Intervento presentato al convegno Foss4g tenutosi a Genova, Italy nel 9-10 febbraio 2017).

Proposal of an abridged procedure to manage Cadastral maps in an open GIS package

BAIOCCHI, VALERIO;CEGLIA, ANTONIO;
2017

Abstract

Cadastral cartography, born after unification of Italy in 1870, is an important source of large scale geographic information. Cadastral maps represent the result of the largest scale survey of on the whole national territory. Because of their large scale, their creation is extremely expensive and the updating of the cadastre claim considerable funds from the state budgets. That’s why the coordinate system, the geodetic basis of a cadastral work, is rarely changed. Even if Gauss-Boaga grid system based on ROMA40 datum was introduced and applied at some smaller parts of the country, the cartographic coordinates manly used in the cadastral maps are based on CassiniSoldner projection and cadastral datum Bessel-Genova; Bessel_Monte Mario and Bessel Castanea delle Furie. In the Cassini-Soldner projection, the whole Italian territory is subdivided in 31 major ("grandi origini") and more than 800 local ("piccole origini") cadastral systems. Nowadays, it is fundamental the implementation of a fast and free procedure for the updating of cadastral maps from Italian cadastral datum to modern WGS84. The two main goals of this paper are: the identification of a suitable set of points with coordinates known in both datums and the computation of Abridging Molodensky parameters from Cassini-Soldner cadastral datum to WGS84. The test area selected is the district of Rome called “Città metropolitana di Roma Capitale” . The data set of points suitable for the least-square estimation is extracted from the information available on the website www.globogis.it/fiduciali.it. The "globogis" database includes a selection of trigonometric points, with coordinates expressed in the WGS84 datum, and a selection of cadastral points ("punti fiduciali") with coordinates expressed in the Bessel-Genova 1902 datum. The whole database is analysed in order to provide the correct association between cadastral and trigonometric points. Known the dataset of points, the Abridging Molodensky parameters are estimated with a least square principle using a specific package developed by Prof. Timar. The estimated parameters are implemented and tested in the open source software QGIS. The accuracy of Abridging Molodensky parameters is tested using an independent set of point with respect to the estimation points.
2017
Foss4g
04 Pubblicazione in atti di convegno::04d Abstract in atti di convegno
Proposal of an abridged procedure to manage Cadastral maps in an open GIS package / Baiocchi, Valerio; Ceglia, Antonio; Deligios, Marco; Giannone, Francesca; Timar, Gabor; Chianese, Antimo. - ELETTRONICO. - 1:(2017), pp. 70-70. (Intervento presentato al convegno Foss4g tenutosi a Genova, Italy nel 9-10 febbraio 2017).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/985659
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