Astronomische Arbeiten: Polhöhen und Azimuthmessungen auf den Stationen: Brasó, Cste, Dubica, Hum, Kloster Ivani, Krimberg, Lagerdorf, Opina, Peterwadein, Serajevo, Segenthau, ibenica

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Multivolume work

Persistent identifier:: 1703275268

Author:: Venturi, Adolfo

Title:: Storia dell'arte italiana

Year of publication:: 1901

Place of publication:: Milano

Publisher of the original:: Ulrico Hoepli, editore libraio della Real Casa

Identifier (digital):: 1703275268

Language:: Italian

Additional Notes:: Bände 1-12 erschienen von 1901-1940

Document type:: Multivolume work

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Persistent identifier:: 1703299760

Author:: Venturi, Adolfo

Title:: La pittura del Trecento e le sue origini

Sub title:: con 818 incisioni in fototipografia

Scope:: XXXI, 1093 Seiten

Year of publication:: 1907

Place of publication:: Milano

Publisher of the original:: Ulrico Hoepli, editore libraio della Real Casa

Identifier (digital):: 1703299760

Illustration:: Illustrationen

Signature of the source:: a 1268(5)

Language:: Italian

Usage licence:: Public Domain Mark 1.0

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2020

Document type:: Volume

Collection:: Arts

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265 International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XXXIX-B4, 2012 XXII ISPRS Congress, 25 August - 01 September 2012, Melbourne, Australia DTM CROSS VALIDATION AND MERGING: PROBLEMS AND SOLUTIONS FOR A CASE STUDY WITHIN THE HELI-DEM PROJECT Ludovico Biagi a , Laura Carcano a '\ Mattia De Agostino b a Politecnico di Milano - DIIAR, Geomatics Laboratory at Como Campus, Via Valleggio 11, IT-22100 Como, *(laura.carcano@ mail.polimi.it) b Politecnico di Torino - DIATI, Corso Duca degli Abruzzi 24, IT-10129 Torino KEY WORDS: DEM/DTM, Georeferencing, Multiresolution, Accuracy, Algorithms, Correlation ABSTRACT: Almost all official national cartographic bases in Europe include Digital Terrain Models (DTMs). To perform analyses at the borders between countries, transnational geographic information is needed: a transnational DTM can be obtained by merging regional DTMs (usually at low resolution) and other typically local high resolution DTMs. To be used the different DTMs must be in the same three dimensional reference frame, they must not present biases and must be consistent at the nominal scale. The following preliminary actions are required: • 3D reference frame transformation of griddcd data, • cross-validation of the regional DTMs, • cross-check of the regional LR DTMs and the local HR DTMs. The paper discusses the study, the implementation and the application of algorithms to solve these problems in the Alpine area between Italy and Switzerland. For this case study, the regional DTMs of Lombardy, Piedmont and Switzerland, respectively with a planimctric resolution of 20, 50 and 25 meters are available. In addition, a LiDAR DTM with a planimetric resolution of 1 meter for the Lombardy and Piedmont hydrographic basins is available. The different DTMs have been transformed to the same reference frame by applying the official national 3D transformations. The cross-validation and the cross-check of the elevation datasets have been performed. All these operations have required the implementation of novel approaches to interpolate and compare DTMs and to spatially analyze their differences. 1. INTRODUCTION Elevation data are fundamental in Geographical Information Systems (GIS) and one of the spatial data provided by the European Directive INSPIRE (Infrastructure for Spatial Information in Europe). They are stored in Digital Elevation Models (DEM, Li et al., 2005, El-Sheimy et al., 2005), which are the basic tools for many environmental and territorial applications. DEM refers to the generic family of elevation models: they are distinguished between Digital Surface Models (DSMs), which represent the surface (including buildings, woods, etc.) and Digital Terrain Models (DTMs) which represent the elevation of bare soil. DTMs are important in Environmental Engineering, Civil Engineering and in many specific applications, such as the design of telecommunication networks or precise agriculture. In recent years, both in Italy and Switzerland, elevation data with different reference frames, technologies, accuracies and data models have been acquired. HELI-DEM (HELvetia-Italy Digital Elevation Model) project (Biagi et al., 2011), funded by the European Regional Development Fund (ERDF) within the Italy-Switzerland cooperation program, aims at developing a unique DTM for the alpine and subalpine area between Italy (Piedmont, Lombardy) and Switzerland (Ticino and Grigioni Cantons). The DTM will be correctly georeferenced and produced validating and integrating all the available data. To meet this task with a planimetric resolution equal or better than 20 meters and the best achievable accuracy according to the available products, a recomputation of the geoid, i.e. the elevation datum, with an accuracy better than 10 cm is required (Barzaghi et al., 2007, Marti et al., 2007). Also the determination of a GNSS network for the validation and georeferencing along the border is necessary. The institutions involved in the project are: Fondazione Politecnico di Milano, Politecnico di Milano, Politecnico di Torino, Provincia Autonoma di Bolzano, Rcgione Lombardia, Rcgione Piemonte and SUPSI (Scuola Universitaria della Svizzera Italiana). Two other institutions, SwissTopo and the Military Geographic Institute (IGM) are involved as external partners. The project is divided into nine Work Packages (WP) whose title and duration are shown in Table 1. In the paper, the first steps of the project will be discussed: in Sect. 2 the available data are presented, in Sect. 3 the adopted strategies to cross-check the data are discussed and their application to some case studies are reported. WP Title Initial Month Final Month WP1 Management 1 30 WP2 Collection and analysis of the available data (DEMs and geoid) 1 6 WP3 Cross validation of DTMs and geoidss 5 16 WP4 GNSS permanent networks 7 18 WP5 Height datum (geoid) unification between Switzerland and Italy 12 23 WP6 External validation and georeferencing of DEMs 21 26 WP7 Integration of all validated height data 16 27 WP8 Experimental use of the project results and final evaluation of the data 22 27 WP9 Diffusion and promotion of the research results 19 30 Table 1. Work Packages of the HELI-DEM projects

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