790 research outputs found
Potentially Polluting Marine Sites GeoDB: An S-100 Geospatial Database as an Effective Contribution to the Protection of the Marine Environment
Potentially Polluting Marine Sites (PPMS) are objects on, or areas of, the seabed that may release pollution in the future. A rationale for, and design of, a geospatial database to inventory and manipu-late PPMS is presented. Built as an S-100 Product Specification, it is specified through human-readable UML diagrams and implemented through machine-readable GML files, and includes auxiliary information such as pollution-control resources and potentially vulnerable sites in order to support analyses of the core data. The design and some aspects of implementation are presented, along with metadata requirements and structure, and a perspective on potential uses of the database
A framework for utility data integration in the UK
In this paper we investigate various factors which prevent utility knowledge from being
fully exploited and suggest that integration techniques can be applied to improve the
quality of utility records. The paper suggests a framework which supports knowledge
and data integration. The framework supports utility integration at two levels: the
schema and data level. Schema level integration ensures that a single, integrated geospatial
data set is available for utility enquiries. Data level integration improves utility data
quality by reducing inconsistency, duplication and conflicts. Moreover, the framework
is designed to preserve autonomy and distribution of utility data. The ultimate aim of
the research is to produce an integrated representation of underground utility infrastructure
in order to gain more accurate knowledge of the buried services. It is hoped that
this approach will enable us to understand various problems associated with utility data,
and to suggest some potential techniques for resolving them
GeomRDF: A Geodata Converter with a Fine-Grained Structured Representation of Geometry in the Web
In recent years, with the advent of the web of data, a growing number of
national mapping agencies tend to publish their geospatial data as Linked Data.
However, differences between traditional GIS data models and Linked Data model
can make the publication process more complicated. Besides, it may require, to
be done, the setting of several parameters and some expertise in the semantic
web technologies. In addition, the use of standards like GeoSPARQL (or ad hoc
predicates) is mandatory to perform spatial queries on published geospatial
data. In this paper, we present GeomRDF, a tool that helps users to convert
spatial data from traditional GIS formats to RDF model easily. It generates
geometries represented as GeoSPARQL WKT literal but also as structured
geometries that can be exploited by using only the RDF query language, SPARQL.
GeomRDF was implemented as a module in the RDF publication platform Datalift. A
validation of GeomRDF has been realized against the French administrative units
dataset (provided by IGN France).Comment: 12 pages, 2 figures, the 1st International Workshop on Geospatial
Linked Data (GeoLD 2014) - SEMANTiCS 201
MSUO Information Technology and Geographical Information Systems: Common Protocols & Procedures. Report to the Marine Safety Umbrella Operation
The Marine Safety Umbrella Operation (MSUO) facilitates the cooperation between Interreg
funded Marine Safety Projects and maritime stakeholders. The main aim of MSUO is to
permit efficient operation of new projects through Project Cooperation Initiatives, these
include the review of the common protocols and procedures for Information Technology (IT)
and Geographical Information Systems (GIS).
This study carried out by CSA Group and the National Centre for Geocomputation (NCG)
reviews current spatial information standards in Europe and the data management
methodologies associated with different marine safety projects.
International best practice was reviewed based on the combined experience of spatial data
research at NCG and initiatives in the US, Canada and the UK relating to marine security
service information and acquisition and integration of large marine datasets for ocean
management purposes.
This report identifies the most appropriate international data management practices that could
be adopted for future MSUO projects
Fachlich erweiterbare 3D-Stadtmodelle â Management, Visualisierung und Interaktion
Domain-extendable semantic 3D city models are complex mappings and inventories of the urban environment which can be utilized as an integrative information backbone to facilitate a range of application fields like urban planning, environmental simulations, disaster management, and energy assessment. Today, more and more countries and cities worldwide are creating their own 3D city models based on the CityGML specification which is an international standard issued by the Open Geospatial Consortium (OGC) to provide an open data model and XML-based format for describing the relevant urban objects with regards to their 3D geometry, topology, semantics, and appearance. It especially provides a flexible and systematic extension mechanism called âApplication Domain Extension (ADE)â which allows third parties to dynamically extend the existing CityGML definitions with additional information models from different application domains for representing the extended or newly introduced geographic object types within a common framework. However, due to the consequent large size and high model complexity, the practical utilization of country-wide CityGML datasets has posed a tremendous challenge regarding the setup of an extensive application system to support the efficient data storage, analysis, management, interaction, and visualization. These requirements have been partly solved by the existing free 3D geo-database solution called â3D City Database (3DCityDB)â which offers a rich set of functionalities for dealing with standard CityGML data models, but lacked the support for CityGML ADEs.
The key motivation of this thesis is to develop a reliable approach for extending the existing database solution to support the efficient management, visualization, and interaction of large geospatial data elements of arbitrary CityGML ADEs. Emphasis is first placed on answering the question of how to dynamically extend the relational database schema by parsing and interpreting the XML schema files of the ADE and dynamically create new database tables accordingly. Based on a comprehensive survey of the related work, a new graph-based framework has been proposed which uses typed and attributed graphs for semantically representing the object-oriented data models of CityGML ADEs and utilizes graph transformation systems to automatically generate compact table structures extending the 3DCityDB. The transformation process is performed by applying a series of fine-grained graph transformation rules which allow users to declaratively describe the complex mapping rules including the optimization concepts that are employed in the development of the 3DCityDB database schema.
The second major contribution of this thesis is the development of a new multi-level system which can serve as a complete and integrative platform for facilitating the various analysis, simulation, and modification operations on the complex-structured 3D city models based on CityGML and 3DCityDB. It introduces an additional application level based on a so-called âapp-conceptâ that allows for constructing a light-weight web application to reach a good balance between the high data model complexity and the specific application requirements of the end users. Each application can be easily built on top of a developed 3D web client whose functionalities go beyond the efficient 3D geo-visualization and interactive exploration, and also allows for performing collaborative modifications and analysis of 3D city models by taking advantage of the Cloud Computing technology. This multi-level system along with the extended 3DCityDB have been successfully utilized and evaluated by many practical projects.Fachlich erweiterbare semantische 3D-Stadtmodelle sind komplexe Abbildungen und DatenbestĂ€nde der stĂ€dtischen Umgebung, die als ein integratives InformationsrĂŒckgrat genutzt werden können, um eine Reihe von Anwendungsfeldern wie z. B. Stadtplanung, Umweltsimulationen, Katastrophenmanagement und Energiebewertung zu ermöglichen. Heute schaffen immer mehr LĂ€nder und StĂ€dte weltweit ihre eigenen 3D-Stadtmodelle auf Basis des internationalen Standards CityGML des Open Geospatial Consortium (OGC), um ein offenes Datenmodell und ein XML-basiertes Format zur Beschreibung der relevanten Stadtobjekte in Bezug auf ihre 3D-Geometrien, Topologien, Semantik und Erscheinungen zur VerfĂŒgung zu stellen. Es bietet insbesondere einen flexiblen und systematischen Erweiterungsmechanismus namens âApplication Domain Extensionâ (ADE), der es Dritten ermöglicht, die bestehenden CityGML-Definitionen mit zusĂ€tzlichen Informationsmodellen aus verschiedenen AnwendungsdomĂ€nen dynamisch zu erweitern, um die erweiterten oder neu eingefĂŒhrten Stadtobjekt-Typen innerhalb eines gemeinsamen Framework zu reprĂ€sentieren. Aufgrund der konsequent groĂen Datenmenge und hohen ModellkomplexitĂ€t bei der praktischen Nutzung der landesweiten CityGML-DatensĂ€tze wurden jedoch enorme Anforderungen an den Aufbau eines umfangreichen Anwendungssystems zur UnterstĂŒtzung der effizienten Speicherung, Analyse, Verwaltung, Interaktion und Visualisierung der Daten gestellt. Die bestehende kostenlose 3D-Geodatenbank-Lösung â3D City Databaseâ (3DCityDB) entsprach bereits teilweise diesen Anforderungen, indem sie zwar eine umfangreiche FunktionalitĂ€t fĂŒr den Umgang mit den Standard-CityGML-Datenmodellen, jedoch keine UnterstĂŒtzung fĂŒr CityGML-ADEs bietet.
Die SchlĂŒsselmotivation fĂŒr diese Arbeit ist es, einen zuverlĂ€ssigen Ansatz zur Erweiterung der bestehenden Datenbanklösung zu entwickeln, um das effiziente Management, die Visualisierung und Interaktion groĂer DatensĂ€tze beliebiger CityGML-ADEs zu unterstĂŒtzen. Der Schwerpunkt liegt zunĂ€chst auf der Beantwortung der SchlĂŒsselfrage, wie man das relationale Datenbankschema dynamisch erweitern kann, indem die XML-Schemadateien der ADE analysiert und interpretiert und anschlieĂend dem entsprechende neue Datenbanktabellen erzeugt werden. Auf Grundlage einer umfassenden Studie verwandter Arbeiten wurde ein neues graphbasiertes Framework entwickelt, das die typisierten und attributierten Graphen zur semantischen Darstellung der objektorientierten Datenmodelle von CityGML-ADEs verwendet und anschlieĂend Graphersetzungssysteme nutzt, um eine kompakte Tabellenstruktur zur Erweiterung der 3DCityDB zu generieren. Der Transformationsprozess wird durch die Anwendung einer Reihe feingranularer Graphersetzungsregeln durchgefĂŒhrt, die es Benutzern ermöglicht, die komplexen Mapping-Regeln einschlieĂlich der Optimierungskonzepte aus der Entwicklung des 3DCityDB-Datenbankschemas deklarativ zu formalisieren.
Der zweite wesentliche Beitrag dieser Arbeit ist die Entwicklung eines neuen mehrstufigen Systemkonzepts, das auf CityGML und 3DCityDB basiert und gleichzeitig als eine komplette und integrative Plattform zur Erleichterung der Analyse, Simulationen und Modifikationen der komplex strukturierten 3D-Stadtmodelle dienen kann. Das Systemkonzept enthĂ€lt eine zusĂ€tzliche Anwendungsebene, die auf einem sogenannten âApp-Konzeptâ basiert, das es ermöglicht, eine leichtgewichtige Applikation bereitzustellen, die eine gute Balance zwischen der hohen ModellkomplexitĂ€t und den spezifischen Anwendungsanforderungen der Endbenutzer erreicht. Jede Applikation lĂ€sst sich ganz einfach mittels eines bereits entwickelten 3D-Webclients aufbauen, dessen FunktionalitĂ€ten ĂŒber die effiziente 3D-Geo-Visualisierung und interaktive Exploration hinausgehen und auch die DurchfĂŒhrung kollaborativer Modifikationen und Analysen von 3D-Stadtmodellen mit Hilfe von der Cloud-Computing-Technologie ermöglichen. Dieses mehrstufige System zusammen mit dem erweiterten 3DCityDB wurde erfolgreich in vielen praktischen Projekten genutzt und bewertet
Fachlich erweiterbare 3D-Stadtmodelle â Management, Visualisierung und Interaktion
Domain-extendable semantic 3D city models are complex mappings and inventories of the urban environment which can be utilized as an integrative information backbone to facilitate a range of application fields like urban planning, environmental simulations, disaster management, and energy assessment. Today, more and more countries and cities worldwide are creating their own 3D city models based on the CityGML specification which is an international standard issued by the Open Geospatial Consortium (OGC) to provide an open data model and XML-based format for describing the relevant urban objects with regards to their 3D geometry, topology, semantics, and appearance. It especially provides a flexible and systematic extension mechanism called âApplication Domain Extension (ADE)â which allows third parties to dynamically extend the existing CityGML definitions with additional information models from different application domains for representing the extended or newly introduced geographic object types within a common framework. However, due to the consequent large size and high model complexity, the practical utilization of country-wide CityGML datasets has posed a tremendous challenge regarding the setup of an extensive application system to support the efficient data storage, analysis, management, interaction, and visualization. These requirements have been partly solved by the existing free 3D geo-database solution called â3D City Database (3DCityDB)â which offers a rich set of functionalities for dealing with standard CityGML data models, but lacked the support for CityGML ADEs. The key motivation of this thesis is to develop a reliable approach for extending the existing database solution to support the efficient management, visualization, and interaction of large geospatial data elements of arbitrary CityGML ADEs. Emphasis is first placed on answering the question of how to dynamically extend the relational database schema by parsing and interpreting the XML schema files of the ADE and dynamically create new database tables accordingly. Based on a comprehensive survey of the related work, a new graph-based framework has been proposed which uses typed and attributed graphs for semantically representing the object-oriented data models of CityGML ADEs and utilizes graph transformation systems to automatically generate compact table structures extending the 3DCityDB. The transformation process is performed by applying a series of fine-grained graph transformation rules which allow users to declaratively describe the complex mapping rules including the optimization concepts that are employed in the development of the 3DCityDB database schema. The second major contribution of this thesis is the development of a new multi-level system which can serve as a complete and integrative platform for facilitating the various analysis, simulation, and modification operations on the complex-structured 3D city models based on CityGML and 3DCityDB. It introduces an additional application level based on a so-called âapp-conceptâ that allows for constructing a light-weight web application to reach a good balance between the high data model complexity and the specific application requirements of the end users. Each application can be easily built on top of a developed 3D web client whose functionalities go beyond the efficient 3D geo-visualization and interactive exploration, and also allows for performing collaborative modifications and analysis of 3D city models by taking advantage of the Cloud Computing technology. This multi-level system along with the extended 3DCityDB have been successfully utilized and evaluated by many practical projects.Fachlich erweiterbare semantische 3D-Stadtmodelle sind komplexe Abbildungen und DatenbestĂ€nde der stĂ€dtischen Umgebung, die als ein integratives InformationsrĂŒckgrat genutzt werden können, um eine Reihe von Anwendungsfeldern wie z. B. Stadtplanung, Umweltsimulationen, Katastrophenmanagement und Energiebewertung zu ermöglichen. Heute schaffen immer mehr LĂ€nder und StĂ€dte weltweit ihre eigenen 3D-Stadtmodelle auf Basis des internationalen Standards CityGML des Open Geospatial Consortium (OGC), um ein offenes Datenmodell und ein XML-basiertes Format zur Beschreibung der relevanten Stadtobjekte in Bezug auf ihre 3D-Geometrien, Topologien, Semantik und Erscheinungen zur VerfĂŒgung zu stellen. Es bietet insbesondere einen flexiblen und systematischen Erweiterungsmechanismus namens âApplication Domain Extensionâ (ADE), der es Dritten ermöglicht, die bestehenden CityGML-Definitionen mit zusĂ€tzlichen Informationsmodellen aus verschiedenen AnwendungsdomĂ€nen dynamisch zu erweitern, um die erweiterten oder neu eingefĂŒhrten Stadtobjekt-Typen innerhalb eines gemeinsamen Framework zu reprĂ€sentieren. Aufgrund der konsequent groĂen Datenmenge und hohen ModellkomplexitĂ€t bei der praktischen Nutzung der landesweiten CityGML-DatensĂ€tze wurden jedoch enorme Anforderungen an den Aufbau eines umfangreichen Anwendungssystems zur UnterstĂŒtzung der effizienten Speicherung, Analyse, Verwaltung, Interaktion und Visualisierung der Daten gestellt. Die bestehende kostenlose 3D-Geodatenbank-Lösung â3D City Databaseâ (3DCityDB) entsprach bereits teilweise diesen Anforderungen, indem sie zwar eine umfangreiche FunktionalitĂ€t fĂŒr den Umgang mit den Standard-CityGML-Datenmodellen, jedoch keine UnterstĂŒtzung fĂŒr CityGML-ADEs bietet. Die SchlĂŒsselmotivation fĂŒr diese Arbeit ist es, einen zuverlĂ€ssigen Ansatz zur Erweiterung der bestehenden Datenbanklösung zu entwickeln, um das effiziente Management, die Visualisierung und Interaktion groĂer DatensĂ€tze beliebiger CityGML-ADEs zu unterstĂŒtzen. Der Schwerpunkt liegt zunĂ€chst auf der Beantwortung der SchlĂŒsselfrage, wie man das relationale Datenbankschema dynamisch erweitern kann, indem die XML-Schemadateien der ADE analysiert und interpretiert und anschlieĂend dem entsprechende neue Datenbanktabellen erzeugt werden. Auf Grundlage einer umfassenden Studie verwandter Arbeiten wurde ein neues graphbasiertes Framework entwickelt, das die typisierten und attributierten Graphen zur semantischen Darstellung der objektorientierten Datenmodelle von CityGML-ADEs verwendet und anschlieĂend Graphersetzungssysteme nutzt, um eine kompakte Tabellenstruktur zur Erweiterung der 3DCityDB zu generieren. Der Transformationsprozess wird durch die Anwendung einer Reihe feingranularer Graphersetzungsregeln durchgefĂŒhrt, die es Benutzern ermöglicht, die komplexen Mapping-Regeln einschlieĂlich der Optimierungskonzepte aus der Entwicklung des 3DCityDB-Datenbankschemas deklarativ zu formalisieren. Der zweite wesentliche Beitrag dieser Arbeit ist die Entwicklung eines neuen mehrstufigen Systemkonzepts, das auf CityGML und 3DCityDB basiert und gleichzeitig als eine komplette und integrative Plattform zur Erleichterung der Analyse, Simulationen und Modifikationen der komplex strukturierten 3D-Stadtmodelle dienen kann. Das Systemkonzept enthĂ€lt eine zusĂ€tzliche Anwendungsebene, die auf einem sogenannten âApp-Konzeptâ basiert, das es ermöglicht, eine leichtgewichtige Applikation bereitzustellen, die eine gute Balance zwischen der hohen ModellkomplexitĂ€t und den spezifischen Anwendungsanforderungen der Endbenutzer erreicht. Jede Applikation lĂ€sst sich ganz einfach mittels eines bereits entwickelten 3D-Webclients aufbauen, dessen FunktionalitĂ€ten ĂŒber die effiziente 3D-Geo-Visualisierung und interaktive Exploration hinausgehen und auch die DurchfĂŒhrung kollaborativer Modifikationen und Analysen von 3D-Stadtmodellen mit Hilfe von der Cloud-Computing-Technologie ermöglichen. Dieses mehrstufige System zusammen mit dem erweiterten 3DCityDB wurde erfolgreich in vielen praktischen Projekten genutzt und bewertet
Integrated XML andGML in Geographical Information System
This project basically concentrated on the study of extensible Markup Language
(XML) and Geography Markup Language (GML) in Geographical Information
System (GIS). The objective of the project is to convert the spatial data (e.g.:
coordinates, area, etc) by using the XML and GML and then coding will be
integrated and viewed in the web browser by using the Scalable Vector Graphic
(SVG)technology. Basically, this project is done to find a new way to overcomethe
weaknesses of map digitizing and taking advantage of the GML technology in
Geographical Information System. The project scope is concentrate on the usage of
XML andGML in GIS. Research is done onXML technologies, which are provided
for GML. The technologies included technology for encoding and data modeling
(Data Type Definition, XML Schema), technology for transforming (XSLT) and
technology for graphic rendering (SVG). Research on GML is focused on
manipulation of spatial data to convert to simple features such as point, line and
polygon. This project combines XML, GML and SVG technologies in order to meet
the project objectives. In completing this project, waterfall model is use as the
methodology for the system development. The project is developed according tothe
four phases of system development, which are planning, analysis, design and
implementation. The discussion ofthis project will be more on GML compatibility
and the advantages of using SVG to view the map. The simple display of map
created will be able to show thatGML is suits for handling geo-spatial data overthe
Internet. The user would be able to view the map and zooming feature is provided
by SVG
UK utility data integration: overcoming schematic heterogeneity
In this paper we discuss syntactic, semantic and schematic issues which inhibit the integration of utility data in the UK. We then focus on the techniques employed within the VISTA project to overcome schematic heterogeneity. A Global
Schema based architecture is employed. Although automated approaches to Global Schema definition were attempted
the heterogeneities of the sector were too great. A manual approach to Global Schema definition was employed. The
techniques used to define and subsequently map source utility data models to this schema are discussed in detail. In order to ensure a coherent integrated model, sub and cross domain validation issues are then highlighted. Finally the proposed framework and data flow for schematic integration is introduced
A geo-database for potentially polluting marine sites and associated risk index
The increasing availability of geospatial marine data provides an opportunity for hydrographic offices to contribute to the identification of Potentially Polluting Marine Sites (PPMS).
To adequately manage these sites, a PPMS Geospatial Database (GeoDB) application was developed to collect and store relevant information suitable for site inventory and geo-spatial analysis. The benefits of structuring the data to conform to the Universal Hydrographic Data Model (IHO S-100) and to use the Geographic Mark-Up Language (GML) for encoding are presented. A storage solution is proposed using a GML-enabled spatial relational database management system (RDBMS). In addition, an example of a risk index methodology is provided based on the defined data structure. The implementation of this example was performed using scripts containing SQL statements.
These procedures were implemented using a cross-platform C++ application based on open-source libraries and called PPMS GeoDB Manager
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