State of the art Technologies for GIS Management Systems Implementation through European Community Research Projects Hellenic Center for Marine Research

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  • Slide 1
  • State of the art Technologies for GIS Management Systems Implementation through European Community Research Projects Hellenic Center for Marine Research Lykiardopoulos Angelos, Iona Athanasia, Lakes Vasilis, Balopoulos Efstathios, Kalkavouras Constantine
  • Slide 2
  • HCMR / Hellenic National Oceanographic Data Center Sections of this presentation Data management and Web Services Quality control in HNODC data base Poseidon system, a short description
  • Slide 3
  • HCMR / Hellenic National Oceanographic Data Center Data Management and Web Services a Historical Brief At the end of 80s and early 90s several Oceanographic Data centers had created Databases with mass storage of spatial Information which concerned Oceanographic research outcomes. This was en enormous step of digital storage because big data volumes organized in Database Systems. PAST Historical Brief Centralized D.M. From Centralized to Distributed Model From Non Spatial to Spatial PRESENT Web Services W.S. Architecture Geospatial W.S. WMS/WFS WPS HNODC General HNODC Architecture HNODC Interface HNODC W.S. FUTURE The new architecture An example Conclusions
  • Slide 4
  • HCMR / Hellenic National Oceanographic Data Center In other words the data centers owned databases Based on various RDBMS mechanisms With their own database Schemas With their own data vocabulary (if existed) With raw data in various formats With Applied various processes of data quality control (or with no data quality control) This effort leaded into the creation of several data bases without any Interoperability among them. Data Management Historical Brief PAST Historical Brief Centralized D.M. From Centralized to Distributed Model From Non Spatial to Spatial PRESENT Web Services W.S. Architecture Geospatial W.S. WMS/WFS WPS HNODC General HNODC Architecture HNODC Interface HNODC W.S. FUTURE The new architecture An example Conclusions
  • Slide 5
  • HCMR / Hellenic National Oceanographic Data Center The centralized Data Management Idea But the oceanographic community had the need of homogenized and comprehensive data sets for various regions and even world wide. Due to the limitations of information technologies this goal was achieved in the framework of several E.U. projects Central accumulation of data from various Data Centers took place Data sets were processed in common data formats and more or less same Q.C. procedures. Finally the dissemination of these Data sets was carried out mainly via digital media (CD-ROMs, etc). PAST Historical Brief Centralized D.M. From Centralized to Distributed Model From Non Spatial to Spatial PRESENT Web Services W.S. Architecture Geospatial W.S. WMS/WFS WPS HNODC General HNODC Architecture HNODC Interface HNODC W.S. FUTURE The new architecture An example Conclusions
  • Slide 6
  • HCMR / Hellenic National Oceanographic Data Center The centralized Data Management Idea During this process: Diverse Data form a wide range of Data Centers were gathered. Passed common homogenization and QC procedures. And finally some comprehensive Data sets were produced and disseminated. But The produced Data Sets were stand alone products stored in digital media. Without any dynamic mechanism of maintenance and enhancement. And without any online access. PAST Historical Brief Centralized D.M. From Centralized to Distributed Model From Non Spatial to Spatial PRESENT Web Services W.S. Architecture Geospatial W.S. WMS/WFS WPS HNODC General HNODC Architecture HNODC Interface HNODC W.S. FUTURE The new architecture An example Conclusions
  • Slide 7
  • HCMR / Hellenic National Oceanographic Data Center From Centralized to Distributed model Thus, the idea of a distributed Oceanographic Data network among the Data Centers start growing up. And since Web technologies were being developed rapidly, became apparent that the above network had to be web based. PAST Historical Brief Centralized D.M. From Centralized to Distributed Model From Non Spatial to Spatial PRESENT Web Services W.S. Architecture Geospatial W.S. WMS/WFS WPS HNODC General HNODC Architecture HNODC Interface HNODC W.S. FUTURE The new architecture An example Conclusions
  • Slide 8
  • HCMR / Hellenic National Oceanographic Data Center Main obstacles The main obstacles that came through for this idea to be fulfilled were: Data bases was in different Schemas and Technologies specific per Data center so there was not any common data interchange mechanism. Data were not homogenized among Data centers. Data quality and Data vocabulary differed from Database to Database PAST Historical Brief Centralized D.M. From Centralized to Distributed Model From Non Spatial to Spatial PRESENT Web Services W.S. Architecture Geospatial W.S. WMS/WFS WPS HNODC General HNODC Architecture HNODC Interface HNODC W.S. FUTURE The new architecture An example Conclusions
  • Slide 9
  • HCMR / Hellenic National Oceanographic Data Center From Non Spatial to Spatial Enabled Databases At the same time another obstacle was that due to premature Data Base technology many RDMBS systems lacked spatial capabilities. So it was very difficult for the end user: To query the Database with spatial criteria To represent geographically the spatial information and produce geospatial products To work interactive with Geo Data through interfaces with geospatial capabilities To combine geospatial data in synthetic data products Hence, for a distributed Oceanographic Data network to be established, the necessity of GIS enabled Databases became apparent as well. PAST Historical Brief Centralized D.M. From Centralized to Distributed Model From Non Spatial to Spatial PRESENT Web Services W.S. Architecture Geospatial W.S. WMS/WFS WPS HNODC General HNODC Architecture HNODC Interface HNODC W.S. FUTURE The new architecture An example Conclusions
  • Slide 10
  • HCMR / Hellenic National Oceanographic Data Center From Non Spatial to Spatial Enabled Databases At the end of 90s most of the common used RDBMS enriched with spatial capabilities and became then powerful mechanisms of integration, exploitation and presentation of spatial information Worldwide oceanographic data centers, exploit this advantage and started upgrading their databases PAST Historical Brief Centralized D.M. From Centralized to Distributed Model From Non Spatial to Spatial PRESENT Web Services W.S. Architecture Geospatial W.S. WMS/WFS WPS HNODC General HNODC Architecture HNODC Interface HNODC W.S. FUTURE The new architecture An example Conclusions
  • Slide 11
  • HCMR / Hellenic National Oceanographic Data Center Interoperability obstacle is remaining But still the luck of interoperability was unsolved. The spatial databases made researchers life easier with regard to querying data or representing graphically geospatial information. But they were acting without any interconnection among the various Data Centers. PAST Historical Brief Centralized D.M. From Centralized to Distributed Model From Non Spatial to Spatial PRESENT Web Services W.S. Architecture Geospatial W.S. WMS/WFS WPS HNODC General HNODC Architecture HNODC Interface HNODC W.S. FUTURE The new architecture An example Conclusions
  • Slide 12
  • HCMR / Hellenic National Oceanographic Data Center SEA DATA NET SEASEARCH MEDAR/MEDATLAS II MEDATLAS Summarizing the historical brief throughout important E.U. projects 1994 Efforts in QC Data homogenization Centralized management Distribution with CD ROMs 1998 Enrich existing data sets Establishment of common protocols in QC and formatting Enhance communication facilities (www, ftp, e- mail etc) 20022006 Development of a pan-european network for ocean and marine data & information management. Improve the exchange, availability and accessibility of ocean & marine data and information. Expand the online metadatabases with input of research institutes. Improve the online accessibility of Sea-Search services & products. Develop a standardized distributed system for managing and disseminating the large and diverse data sets Enhance the currently existing infrastructures with web services PAST Historical Brief Centralized D.M. From Centralized to Distributed Model From Non Spatial to Spatial PRESENT Web Services W.S. Architecture Geospatial W.S. WMS/WFS WPS HNODC General HNODC Architecture HNODC Interface HNODC W.S. FUTURE The new architecture An example Conclusions
  • Slide 13
  • HCMR / Hellenic National Oceanographic Data Center Web Services At the same time with the efforts of the Oceanographic community, during the last five years new technologies aroused and became common known as: Web Services PAST Historical Brief Centralized D.M. From Centralized to Distributed Model From Non Spatial to Spatial PRESENT Web Services W.S. Architecture Geospatial W.S. WMS/WFS WPS HNODC General HNODC Architecture HNODC Interface HNODC W.S. FUTURE The new architecture An example Conclusions
  • Slide 14
  • HCMR / Hellenic National Oceanographic Data Center Web Services fundamentals First of all what is a Web Service? The hidden idea behind WS is the existence of a universal messaging mechanism, capable to deliver and translate messages for diverse and different systems. This feature came to open the road for the solution of interoperability. If different and diverse systems can interpret and process requests from each other let them stay different. PAST Historical Brief Centralized D.M. From Centralized to Distributed Model From Non Spatial to Spatial PRESENT Web Services W.S. Architecture Geospatial W.S. WMS/WFS WPS HNODC General HNODC Architecture HNODC Interface HNODC W.S. FUTURE The new architecture An example Conclusions
  • Slide 15
  • HCMR / Hellenic National Oceanographic Data Center There are various theoretical definitions of What Web Service is such as: A software system designed to support interoperable machine-to-machine interaction over a network. It has an interface described in a machine - processable format (specifically WSDL). Other systems interact with the Web service in a manner prescribed by its description using SOAP messages, typically conveyed using HTTP with XML serialization in conjunction with other Web-related standards. (W3C, 2004) What is a Web Service? PAST Historical Brief Centralized D.M. From Centralized to Distributed Model From Non Spatial to Spatial PRESENT Web Services W.S. Architecture Geospatial W.S. WMS/WFS WPS HNODC General HNODC Architecture HNODC Interface HNODC W.S. FUTURE The new architecture An example Conclusions
  • Slide 16
  • HCMR / Hellenic National Oceanographic Data Center What is a web Service? or Web services are a distributed computing architecture. Only this particular architecture makes use of loosely coupled applications, as opposed to tightly coupled applications, to enable applications to communicate. This tightly coupled concept radically affects how information systems will work in the future (Clabby 2003) PAST Historical Brief Centralized D.M. From Centralized to Distributed Model From Non Spatial to Spatial PRESENT Web Services W.S. Architecture Geospatial W.S. WMS/WFS WPS HNODC General HNODC Architecture HNODC Interface HNODC W.S. FUTURE The new architecture An example Conclusions
  • Slide 17
  • HCMR / Hellenic National Oceanographic Data Center What is a web Service? Generalizing we may define that: Web services provide a convenient and standardised way of exposing business logic over a network (the Internet) by use of specific components of communication The basic components of WS are SOAP (Simple Object Access Protocol) which provides a Standardized messaging structure based on XML UDDI (Universal Description, Discovery and Integration) which provides the ability to dynamically select a service at runtime WSDL (Web Services Description Language) which describes how the client communicates with a Web service or what a service does or where is located. PAST Historical Brief Centralized D.M. From Centralized to Distributed Model From Non Spatial to Spatial PRESENT Web Services W.S. Architecture Geospatial W.S. WMS/WFS WPS HNODC General HNODC Architecture HNODC Interface HNODC W.S. FUTURE The new architecture An example Conclusions
  • Slide 18
  • HCMR / Hellenic National Oceanographic Data Center In the most simple form a web service architecture may be depicted as the diagram Web Service Architecture PAST Historical Brief Centralized D.M. From Centralized to Distributed Model From Non Spatial to Spatial PRESENT Web Services W.S. Architecture Geospatial W.S. WMS/WFS WPS HNODC General HNODC Architecture HNODC Interface HNODC W.S. FUTURE The new architecture An example Conclusions
  • Slide 19
  • HCMR / Hellenic National Oceanographic Data Center Geospatial Web Services The rapid development of technologies towards WS concept has produced several sets of Web Services with regard to the area of the WS applicability. Especially for Geospatial data, Open Geographical Consortium (OGC) has defined two basic sets of Geospatial Web Services. PAST Historical Brief Centralized D.M. From Centralized to Distributed Model From Non Spatial to Spatial PRESENT Web Services W.S. Architecture Geospatial W.S. WMS/WFS WPS HNODC General HNODC Architecture HNODC Interface HNODC W.S. FUTURE The new architecture An example Conclusions
  • Slide 20
  • HCMR / Hellenic National Oceanographic Data Center The Web Map Services (WMS) which are concerned with transforming spatial data into maps (images). The Web Feature Services (WFS) which are concerned with direct access to data - reading, writing, and updating data. WMS and WFS PAST Historical Brief Centralized D.M. From Centralized to Distributed Model From Non Spatial to Spatial PRESENT Web Services W.S. Architecture Geospatial W.S. WMS/WFS WPS HNODC General HNODC Architecture HNODC Interface HNODC W.S. FUTURE The new architecture An example Conclusions
  • Slide 21
  • HCMR / Hellenic National Oceanographic Data Center Furthermore, more Web services are under finalization process, one of the most important of them is WPS (Web Processing Service) WPS is designed to standardize the way that GIS calculations are made available to the Internet.GIS Can describe any calculation (i.e. process) including all of its inputs and outputs, and trigger its execution as a Web Service.Web Service Supports simultaneous exposure of processes via GET, POST, and SOAP, thus allowing the client to choose the most appropriate interface mechanism. Web Processing Services PAST Historical Brief Centralized D.M. From Centralized to Distributed Model From Non Spatial to Spatial PRESENT Web Services W.S. Architecture Geospatial W.S. WMS/WFS WPS HNODC General HNODC Architecture HNODC Interface HNODC W.S. FUTURE The new...

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