1,721,339 research outputs found
Gastroenterological oncology: An urgent priority for the new born multidisciplinary academy for digestive oncology (AMOD)
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Stabilità dei sistemi di riferimento nella determinazione di reti GPS
No full textFour GPS campaigns were performed on the section Bolzano - Reggio Emilia of the European Geotraverse in 1989, 1990, 1991 and 1992. Analysis of the results their cartesian components is about 10-6. We study the reason of this discrepancy starting from the operational GPS reference system, defined by ephemerides, and we suggest a method to improve the estimates of the cartesian components (therefore the estimates of points coordinates too) in GPS networks. We apply the method to the data collected in the quoted campaigns by the program NETGPS implemented to this aim, and we show its good results
Satellite remote sensing for DSM generation of urban areas = Telerilevamento satellitare per generazione di DSM di aree urbane
No full textFOSS4G date assessment on the isprs optical stereo satellite data: A benchmark for DSM generation
No full textThe ISPRS Working Group 4 Commission I on "Geometric and Radiometric Modelling of Optical Spaceborne Sensors", provides a benchmark dataset with several stereo data sets from space borne stereo sensors. In this work, the Worldview-1 and Cartosat-1 datasets are used, in order to test the Free and Open Source Software for Geospatial (FOSS4G) Digital Automatic Terrain Extractor (DATE), developed at Geodesy and Geomatics Division, University of Rome "La Sapienza", able to generate Digital Surface Models starting from optical and SAR satellite images. The accuracy in terms of NMAD ranges from 1 to 3 m for Wordview-1, and from 4 to 6 m for Cartosat-1. The results obtained show a general better 3D reconstruction for Worldview-1 DSMs with respect to Cartosat-1, and a different completeness level for the three analysed tiles, characterized by different slopes and land cover
Comparisons of deformations resulting from GPS and VLBI data: problems and preliminary results
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