125 research outputs found
Evoluzione della foce del Volturno e del litorale circostante da cartografie storiche e recenti
No full textVolturno mouth and Campania neighbouring shores are characterised from time by morphological modifications that in the last decades have caused a great cost-line withdrawal. To plan actions for limiting these phenomena and their impacts, a detailed cognizance on dynamics and relative consequences on territory and environment is indispensable: reconstruction of changes occurred to fluvial mouth and coastal morphology, or, in other terms, quantitative determination of variations, must be realised. The use of historical and recent maps is fundamental, taking into account representation accuracy.
This paper concerns the methodological approach adopted to compare morphological data included in different cartographic documents, such as historical and recent maps produced by IGMI (Istituto Geografico Militare Italiano), Campania Region, and CasMez between 1876 and 1998. Taking into account heterogeneity of these documentations, to realise comparisons of their contents, all data are related to the same datum (Gauss-Boaga Roma40)
L’impiego dei GIS per l’analisi delle trasformazioni territoriali nell’isola d’Ischia
No full textLa conoscenza delle variazioni indotte dalle attività dell’uomo sulla configurazione dei luoghi, gli usi del suolo, l’equilibrio degli ecosistemi naturali e non, costituisce premessa fondamentale degli interventi di pianificazione: i GIS possono fornire un supporto fondamentale già nella fase di studio delle dinamiche in atto.
In questo lavoro viene utilizzato il software ArcGIS 9.0 della ESRI per l’analisi delle trasformazioni che hanno interessato il territorio dell’isola di Ischia dal 1975 al 2000. Costruito il database cartografico, si individuano le variazioni degli usi del suolo, utilizzando come fonti informative cartografie (CTR della Cassa del Mezzogiorno del 1975, CTP del 1998), foto aeree (1975 e 1998) e dati del progetto CORINE Land Cover (1990 e 2000). Attraverso l’impiego del DTM dell’isola ed i moduli 3D Analyst e Spatial Analyst si determinano le estensioni delle aree considerate, per procedere alla definizione quantitativa delle variazioni introdotte nell’arco di tempo considerato
Impiego di immagini satellitari ad alta risoluzione nel monitoraggio dell’erosione costiera
No full textTo plan operations for stopping or at least limiting effects of coastal erosion, monitoring actions must be prepared to measure
shoreline changes: to the purpose topographic methods (GPS, for example) as well as procedures for elaboration of remote-sensing
data (by aircraft or satellite) can be used; the second ones are available also in archive, resulting referred to preceding periods. A
further and effective support to the historical reconstruction of trends is supplied by maps, while GISs ease comparison of data that
are heterogeneous because of relative acquisition techniques as well as geodetic datum and cartographic representation.
In this paper contribution of satellite high resolution images is remarked: using orthorectification process different kinds of satellite
high resolution images (Quickbird, Ikonos, Eros) permit to establish shoreline position with enough accuracy (1-2 m) according
with the purpose of many monitoring plans. Considering a true case (Casal Velino, Province of Salerno), adopted procedure to define
shorelines using Ikonos images, format GEO (11 bit, geometric resolution of 1 m x 1m for pancromatic, 4 m x 4 m for
multispectral): orthorectification is realized using Rational Polynomial Functions based on Ground Control Points belonging to ortho
photos (scale 1:10.000). Comparison between different shoreline collocations is carried out in GIS environment, so to provide not
only measure tools, but also archive for images and textual documents that can be linked to maps and recalled, in any moment, for
consulting
1988 CIRA satellite research workshop
No full textThis document reports on a Satellite Research Workshop sponsored by the Cooperative Institute for Research in the Atmosphere (CIRA) that was held at the Colorado State University's Pingree Park campus from September 21-23, 1988. The workshop was designed to investigate research and applications opportunities using data from the next generation GOES and TIROS satellites
La cartografia in rete e nelle applicazioni WEBGIS
No full textThe term WEBGIS (alternatively WEB-based GIS, Online GIS, Distributed GIS) is used to indicate via Internet/Intranet use of Geographic Information Systems functions, so to supply georeferred information to users. As well as in no-web applications, element of fundamental importance is cartography, or, in other terms, the representation of hearth surface (or part of it), to which databases are linked. Presence of cartographic files in web does not imply WEBGIS: sometimes there are only static pages to which user accesses without activation of spatial analysis.
In this paper, considering bibliographic research and experiments conducted at Geomatic Laboratory of Faculty of Sciences and Technologies of University of Naples “Parthenope”, an overview on state of art concerning maps in WEB and in WEBGIS is supplied. Particularly, criteria for distinction and classification of possibilities to insert and use geographic data in Internet and to manipulate them are evidenced. Principal characteristics of languages, formats and standards to insert in Internet maps are considered, such as HTML (HyperText Markup Language) and SVG (Scalable Vector Graphics); particular attention is reserved to GML (Generalized Markup Language) from OGC (Open Geospatial Consortium), which can include in each feature both spatial information as well as attributes (generally included in linked alphanumeric databases)
Ortho-rectification of Ikonos panchromatic images using detailed maps
No full textIKONOS panchromatic images (1 m geometric resolution,
11 bit radiometric resolution) can be ortho-rectified using
Polynomial Rational Functions without knowledge of the
full sensor information: corrected coordinates are
determined with several Ground Control Points (GCPs), of
which both elevation and X,Y positioning must be known.
GCPs coordinates can be not only obtained with GPS, but
also derived from detailed maps (scale 1:10.000 – 1:5.000
or greater).
In this paper possibilities to ortho-rectify IKONOS images
using as GCPs points on maps and validate achieved
geometrical quality are considered. The research is
performed on IKONOS panchromatic image of an area in
Campania Region: differences among the GCPs values (as
well as Check Points values) on the maps and the
corresponding points values on the derived image are
calculated and analyzed to define geometrical quality of
resulting product. Ortho-rectification is conducted using
Polynomial Rational Functions: coordinates of GCPs are
derived from digital maps at 1:5.000 scale. The variability
of results in relation to the number of GCPs is analyzed and
considerations about their geometrical accuracy so to define
scale use of the corresponding ortho-rectified image are
supplied
Impiego di banche dati topografiche in ambiente GIS per la costruzione di modelli tematici 3d
No full textThe thematic maps concur to represent the variability of one or more phenomena on a territory, favoring the communication of information through georeferred synoptic frames and supplying bases for ulterior studies imprinted on the principles and methods of space analysis. The employment, in GIS environmernt, of topographical database containing information also on altimetry of the territory renders the construction of three-dimensional thematic models possible, concurring, for example, to represent the variability of one or more phenomena in reference to DTM (Digital Terrain Model) or Cad 3d features.
In this paper characteristics of thematic 3d models and GIS techniques to obtain them are described, evidencing some analogies and differences in reference to the traditional 2d representation. Considering an area, that one including Vesuvio Vulcan, of which both topographical and thematic data (demographic and social economic indices, soil use, etc) are available, executed procedures within ArcGIS 9.0 for 3d models are presented. In particular, to introduce examples of different typologies of 3d thematic models, procedures to resolve some problems are illustrated in reference to: datum transformation, DTM realization, data grouping, models building
Improving Geometric resolution of NDVI results with panchromatic and multispectral data fusion
No full textThe NDVI (Normalized Difference Vegetation Index)
requires red and infrared remotely sensed images to assess
whether the vegetation is present or not. Data collected by
red and infrared bands sensors can be substituted by
synthetic images, with higher geometric resolution, that are
obtained using pan-sharpening techniques: pixel dimensions
of panchromatic data are transferred to multispectral ones,
so more detailed information is available for NDVI
application.
In this paper Landsat 7 ETM+ and IKONOS imageries are
considered in reference to Campania Region. Geometric
resolution of NDVI results is improved using Zhang
method, an example of modulation-based fusion techniques.
The derived red and infrared images present pixels 14.25 m
x 14.25 m in the case of Landsat 7 ETM+, 1 m x 1 m for
IKONOS
CIRA: a synopsis of activity, September 1980 - December 1981
No full textFebruary 1982.This first "mid-year" report from the Cooperative Institute for in the Atmosphere (CIRA) is intended to communicate scientific results and information about current activities to NOAA and CSU scientists, students and staff as well as other interested parties. Falling as it does at a report time after the first full year of CIRA operations, it thus becomes the first CIRA summary report to carry scientific information
Forecasting rain events in the southern Great Plains using GPS total precipitable water amounts
No full textFunding for this research is supported by an American Meteorological Society Graduate Student Fellowship, sponsored by the National Oceanic and Atmospheric Administration's (NOAA) Office of Global Programs, by NOAA under cooperative agreement NA17RJ1228 with CIRA, and by the Research and Scholarly Programs fund at Colorado State University (CSU)
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