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1

The transmission of GNSS data in the distart network for real kinematic positioning

Barbarella M., Bedin A., Gandolfi S.

Reports on Geodesy

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2006

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z. 2/77

241-247

EN

The GNSS RTK-Networks have been aroused a great interest for the advantages in the surveying of the territory in comparison to the traditional RTK methodology. The DISTART in the last year has improved a Network for RTK positioning. At present the net is composed by 8 permanent stations. The control centre is nearby the Department of DISTART of Bologna University. This network is fundamental to investigate all aspects concerning the networks for real time applications. Particularly, not only the topographic feature is investigated, but a very important aspect concerning the data transmission infrastructure is analyzed. In fact the first experimentations demonstrated that the performance of the topographic network depends on the guarantee of a correct data transmission from the GNSS permanent stations to the Control Centre. To investigate on this field we built a network composed by mixed physical data transmission infrastructure between control centre and the permanent stations on the territory (topographic baselines about 70-80 Km) using university Italian network (GARR) and commercial networks. We studied the time of latency of data transmitted, that is an important aspect of the network, because to solve ambiguities every software for real time network solution needs that the GNSS permanent station observations arrives with a latency not too much greater than a second. Parallely we studied other important aspects of the data transmission in the network like the NAPs (Network Access Protocols), the velocities, the data formats (RTCM 2.X, RTCM 3.0). In this work we want to give the direction to characterize a procedure step by step of a network installation, wit h the purpose to define a standard, possibly certified, about procedures, materials, softwares to use to install a network of GNSS permanent stations for RTK positioning.

2

Metric and qualitative evaluation of quickbird orthoimages for a large scale geodatabase creation

Barbarella M., Zanni M.

Reports on Geodesy

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2006

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z. 2/77

255-262

3

GPS-RTK coupled with classical measurements for survey of fiducial cadastrial points: consideration and results

Barbarella M., Gandolfi S.

Reports on Geodesy

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2003

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z. 2/65

135-144

4

Database and GIS relative to geomatic surveys set up after the hydrological catastrophe in Sarno (Italy)

Barbarella M., Lenzi V.

Reports on Geodesy

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2003

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z. 2/65

254-263

EN

This work deals with the creation or a Database and its reIative GIS concerning all the geomatic survey data collected during and after the emergency as a result or the hydrogeological event in Sarno, in South Italy. The catastrophic event was characterised by several landslides which occurred in May 1998. The purpose of this project is the creation of a database to organize and recover a great amount of geodetic data. Raw data were originated from different survey technologies, both traditional and modern: Photogrammetry, Airborne Laser Scanning, Remote Sensing, Ground Based Survey and Digitalization of Cartography. Several research teams also took part in processing the data and raw data were processed by different software packages producing different format files, primary data survey and processing data were thus collected to avoid dispersion of environmental information. As reported by many authors, the GIS and its reIated database are the most useful tools as a support in the decision-making strategies and in environmental data management. It should be pointed out that this project is in the strict sense a GIS concerning the specific case of Sarno and the specific management of geodetic data.