1,720,988 research outputs found
Appropriate Use of the International Reference Frames in Regional GPS Applications: Guidelines and Examples
No full textThe growing number of GPS permanent stations, in Europe as in the rest of the world, makes them very interesting not only for their original scientific or global geodesy purposes, but also for many current technical applications (e.g. photogrammetric, cartography, GIS data collection, cadastral surveys, etc.). In the first part of this paper, the basic definitions of the most important global reference frames will be briefly resumed, underlining some important aspects which must be understood for a correct use of the frames in the applications. In the second part, some numerical examples will be presented and discussed. These concern recurring technical problems, testing the correctness of the theoretical assumptions and estimating the position errors deriving from the use of inappropriate procedures. Finally, a few guidelines for the practical utilization of the frames will be derived from the above results
Sistemi di Riferimento Globali e Trasformazioni di Coordinate
No full textVengono descritte alcuni algoritmi per il passaggio o la trasformazione di coordianate tra i datum presenti nella tecnica GPS
Volatile constituents of the fruit secretory glandes of Zanthoxylum bungeanum Maxim.
No full textJ. ESS. OIL RES
Injection of a sample by means of microneedles followed by capillary gas chromatography.
No full textJ. CHROMATOGR. SCI
Necropolis of Palazzone in Perugia: Geomatic data integration for 3D modeling and geomorphology of underground sites
No full textThis article presents and analyzes the methodologies and results of the survey of an Etruscan archaeological site (the Necropolis of Palazzone) with tombs dug into the ground on a slope belonging to the Perugia hill, in central Italy. The survey presented particular difficulties, since the underground rooms are numerous, small, and not illuminated, and it required the creation of a unique geometric model, including both the underground and the external area. Therefore, different techniques and tools of geomatics were used: GNSS, total station 3D survey, terrestrial laser scanning, and digital photogrammetry, with the consequent need to manage and integrate a large amount of data. It was also possible to compare the results acquired with different methods, such as the digital terrain model of the external surface obtained by unmanned aerial vehicle photogrammetry or by kinematic GNSS survey. The survey had a dual purpose: to acquire documentation of the archaeological site geometry to be imported into GIS; and to support knowledge of the geomorphologic aspects of the area, as the tombs—carved into the sedimentary formations—allow us to observe and study the local stratigraphy in detail, while the geomatic surveys put the rooms in geometric relation to each other in 3D space
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