1,721,014 research outputs found
Le Stazioni Permanenti e la Rete Geodetica Italiana
No full textLe Stazioni Permanenti GPS consentono il monitoraggio continuo della propria posizione, rispetto ai sistemi geodetici che definiscono le orbite dei satelliti acquisiti. A livello internazionale le osservabili GNSS rilevate dalle Stazioni Permanenti, da sole o in aggiunta ad altri osservabili di geodesia spaziale, consentono la realizzazione di Datum Geodetici globali quali l’ITRS e, per l’Unione Europea, l’ ETRS89. Un recente Decreto della Presidenza del Consiglio dei Ministri ha introdotto come Sistema geodetico italiano l’Etrs89, frame ETRF00
Si descrivono le operazioni di calcolo che sono state effettuate da IGM e da strutture universitarie sotto gli auspici del CISIS al fine di definire una rete di stazioni Permanenti GPS – la Rete Dinamica Nazionale - accettata da EUREF come raffittimento della Rete Europea EPN.
Ulteriori recenti elaborazioni hanno consentito di pervenire alla definizione dei trend tendenziali di movimento delle Stazioni della Rete Dinamica Nazionale La disponibilità di una struttura nazionale può essere usata per la omogeneizzazione delle coordinate delle molte reti per il rilievo in tempo reale NRTK esistenti in Italia: viene riportato brevemente un esempio di modalità d’inquadramento
Vengono infine discusse alcune criticità che permangono per il completo uso della Rete Dinamica Nazionale: la necessità di realizzarne il monitoraggio e renderne facilmente fruibili i dati
Optimization of the reordering algorithm for least squares problems relevant to space geodesy
No full textCompensazione cinematica ed analisi spaziale delle reti di livellazione geometrica eseguite dal Catasto nella citta' di Milano
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Block adjustment and digital model of photogrammetric data in a control problem for the "Ancona'82" landslide
No full textFurther developments on digital models in a control problem for the Ancona '82 landslid
No full textIn December 1982, a large scale landslide )220 ha) has interested the district of Ancona (Italy), involving also some residential quarters of the city. A working group consisting of geologist, geophysicists, geotechnicians and geodesists has been set up in order to analized the causes, to control the ground settling and to determine the consequent destination of the area. Inside this working group, the geodesists have performed the control surveying by topographic and photogrammetric instruments. The former is a still going operation intended to control the settlement of the terrain after the landslide, the latter is mainly the study of the deformation of the landslide occurence. The photogrammetric models are observed in order to achieve a regular grid of points on the ground. In this way it has been possible:
- to compute the earth settlements;
- to evaluate the volumes involved;
- to analyzed the shape and the pattern of the break lines;
- to point out the landslide boundary.
This paper presents the results obtained in this context
Utopia and its maps
No full textIn the past centuries, scholars, philosophers, dreamers, idealists have devised a better world: they found it easier, other than in books, express it as maps, possibly attractive.
Nowadays, we have adequate numbers and quality of maps of any type, which let us face almost every type of emergency, specially in the field of seismic, environmental and hydro-geological risks.
Also we have an adequate cartographical support for exploitation of natural resources, actual or supposed, in the field of social applications (famine, drought, health and social displacements, ...).
Geomatics and Geoinformation, can give very important contribution to many human activities, on the contrary, they can terribly support, in very sophisticated way, the escalation of armies, wars and destruction, producing negative effects, both in high intensity and large extension.
Science and technique cannot be isolated from the whole human life context, but they should positively play a fundamental role in the real world. The encouragement of a peaceful use of mature and innovative technologies, in order to achieve concrete social, economic and cultural benefits for all the people, increases, to a high level standard, the quality of their life.
A correct information passes through a different conceived Cartography: see the Peters’ atlas (Arno Peters, 1980), edited in the framework of Willy Brandt’s report about North-South
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