Concerning geographic data representation, what a user need is specific tools for the representation and evaluation of the data on which the decision process relies. In cartographic applications, users need to deal with maps of the same geographic region at different levels of abstractions. Usually it’s used to maintain one database per level detail; a multiscale representation GIS would allow storing all original geographical information in a single database, and enforce the consistency of the different representations through appropriate, automatic generalization processes. In this paper we deal with the problem of geographic data generalization, beginning from a generalization workflow by improving specific routines. To aim the goals of the generalization process, we used the ESRI ArcGIS 8.1 platform. Inside this enviroment it have been implemented some generalization functionalities by improving appropriate ruotines in Visual Basic language. After a presentation of the generalization workflow, all cartographic constraints, of geometric, topological and semantic nature, governing the generalization process, are specified. In the next step these constraints will be translated into tools for assessing the need and the quality of generalization solutions. These tools are associated with a particular data model. For that data model the constraints can be best translated to measures and generalization algorithms and parameterized. This framework is based on constraints that are used to control the process and represent the user requirements in a way the system can manage to reach a quality close to these requirements; it reflects the idea that more than one acceptable solution may exist to a given generalization problem. The goal was the production of a topographic map at scale 1:50000, 1:100000 and 1:250000 from the “Carta Tecnica Regionale”, CTR, (official regional cartography) of the “Regione Autonoma della Sardegna”, RAS, (Regional Administration of Sardinia), at scale 1:10000, in a GIS environment. According with the official national and international standards, we provide the definition of the characteristics and associated quality evaluation tool to be used in order to validate the geographic data.

Multiscale representation: a data generalization workflow and quality evaluation experience in GIS enviroment

VACCA, GIUSEPPINA;
2004

Abstract

Concerning geographic data representation, what a user need is specific tools for the representation and evaluation of the data on which the decision process relies. In cartographic applications, users need to deal with maps of the same geographic region at different levels of abstractions. Usually it’s used to maintain one database per level detail; a multiscale representation GIS would allow storing all original geographical information in a single database, and enforce the consistency of the different representations through appropriate, automatic generalization processes. In this paper we deal with the problem of geographic data generalization, beginning from a generalization workflow by improving specific routines. To aim the goals of the generalization process, we used the ESRI ArcGIS 8.1 platform. Inside this enviroment it have been implemented some generalization functionalities by improving appropriate ruotines in Visual Basic language. After a presentation of the generalization workflow, all cartographic constraints, of geometric, topological and semantic nature, governing the generalization process, are specified. In the next step these constraints will be translated into tools for assessing the need and the quality of generalization solutions. These tools are associated with a particular data model. For that data model the constraints can be best translated to measures and generalization algorithms and parameterized. This framework is based on constraints that are used to control the process and represent the user requirements in a way the system can manage to reach a quality close to these requirements; it reflects the idea that more than one acceptable solution may exist to a given generalization problem. The goal was the production of a topographic map at scale 1:50000, 1:100000 and 1:250000 from the “Carta Tecnica Regionale”, CTR, (official regional cartography) of the “Regione Autonoma della Sardegna”, RAS, (Regional Administration of Sardinia), at scale 1:10000, in a GIS environment. According with the official national and international standards, we provide the definition of the characteristics and associated quality evaluation tool to be used in order to validate the geographic data.
Generalization; Abstraction; Database; GIS; Parameters; Representation; Standards; Quality
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11584/71137
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