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Mean density map for the Italian region by GIS techniques
Language
English
Obiettivo Specifico
3.3. Geodinamica e struttura dell'interno della Terra
Status
Published
JCR Journal
N/A or not JCR
Peer review journal
Yes
Title of the book
Issue/vol(year)
8/december (1998)
ISSN
1128-3955
Pages (printed)
93-103
Issued date
December 1998
Keywords
Abstract
The knowledge of the mean density of the masses between the Earth’ s surface and the geoid (”topographic masses”) is remarkably interesting for several geodetic and geophysical investigations; for this purpose, it is very useful to manage these data in digital form. At present the only information available about the mean density of the Italian region is the 1: 1 000 000 scale graphical map, published by Vecchia in 1955. This map was drawn by computing the mean densities based on many geological maps and profiles, and grouping these values
into 8 classes ranging from 1.8 and 3.4 g/cm3, each class being 0.2 g/cm3 wide.
By first scanning the graphical map, the raster file was then georeferenced in the
WGS84 reference frame, taking special care to modelling and removing the deformations due both to the paper and the scanning process. Finally, ASCII files of the mean density values sampled on a 15″ x 20″ (latitude x longitude) regular grid and a vector file for convenient data manipulation and representation were produced. The main steps of the data processing were performed in the Intergraph MGE environment and a Fortran 77 service program was written in order to produce the ASCII files in a suitable form.
into 8 classes ranging from 1.8 and 3.4 g/cm3, each class being 0.2 g/cm3 wide.
By first scanning the graphical map, the raster file was then georeferenced in the
WGS84 reference frame, taking special care to modelling and removing the deformations due both to the paper and the scanning process. Finally, ASCII files of the mean density values sampled on a 15″ x 20″ (latitude x longitude) regular grid and a vector file for convenient data manipulation and representation were produced. The main steps of the data processing were performed in the Intergraph MGE environment and a Fortran 77 service program was written in order to produce the ASCII files in a suitable form.
References
Ballarin S. (1960) Introduzione alle tabelle per la riduzione isostatica delle misure di gravità. Raccolta de Il Bollettino Risponde dal 1950 al 1995, Bollettino di Geodesia e Scienze Affini, XIX, I 815-956. Ballarin S., Palla B., Trombetti C. (1972). The construction of the Gravimetric Map of Italy, Pubblicazioni della Commissione Geodetica Italiana, terza serie, memoria n. 19.Barzaghi R., Brovelli M., Manzino A., Sansò F., Sguerso D., Sona G. (1997). Il Geoide in Italia e le sue future applicazioni, Atti del Workshop La Geodesia Spaziale nel Mediterraneo, Cagliari 27 e 28 Febbraio 1997. Burrough P.A. and MCDonnel R.A. (1998). Principles of Geographical Information Systems, Oxford University Press. Heiskanen W.A. and Moritz H. (1967). Physical geodesy, Freeman, San Francisco. Surace L. (1997). La nuova rete geodetica nazionale IGM95: risultati e prospettive di utilizzazione. Bollettino di Geodesia e Scienze Affini, anno LVI, m3, 357-378. Torge W. (1989). Gravimetry. Walter de Gruyter Editor, Berlino-New-York. Vecchia O. (1995).Carta della densità media sino al livello del mare in Italia, Pubblicazioni della Commissione Geodetica Italiana, terza serie, memoria n. 9.
Type
article
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riguzzi_IGeS_1998.pdf
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Size
3.66 MB
Format
Adobe PDF
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