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International Archives of the Photogrammetry, 
  
  
  
  
Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B2. Istanbul 2004 
  
   
    
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
        
     
  
rr TT : GSI Broker EIER 
System metadata & . (interworkflow tools) System metadata & | 
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Figure 4. GSI broker conceptual architecture for the Virtual Land Agency 
A client/server architecture that supports the GSI virtual 
enterprise has been defined, with special attention to the GSI 
broker, which will provide the services and functions required 
to link the clients and the enterprises data and processes. The 
client can be an individual looking for data as in the case of 
traditional GDI concept or it can be a geo-information 
production organisation looking for partners to extend its 
production. The second client is the focus of the broker 
services. The GSI broker supports scarching for services, 
definition, control and execution of workflows from different 
enterprises to supply a demand by using an inter-workflow 
management system. 
The Inter-workflow management system is an appropriate tool 
to create and manage virtual enterprises supporting the design, 
integration, operation and control of processes which are 
provided as services by multiple enterprises. 
References 
[1] T. Adams and S. Dworkin. WfMC Workflow Handbook, 
chapter Workflow Interoperability Between Businesses, pages 
211-221. John Wiley & Sons, 1997. 
[2] N. Alameh. Scalable and Extensible Infrastructures. for 
Distributing Interoperable Geographic Information Services on 
the Internet. PhD thesis, Massachusetts Institute of Technology 
(MIT), Massachussets, United States of America. 2001. 
[3] Peter Bernus and Laszlo Nemes. Modelling and 
methodologies for enterprise integration. In Proceedings of the 
International Federation for Information Processing (IFIP) 
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Integration. Chapman & Hall. 1996. 
[4] H. Hayami and M. Katsumata. WfMC: Workflow handbook 
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199 
[5] J. Kanet, W. Faisst, and P. Mertens. Application of 
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[6] L. Alvarez. Geoinformation virtual enterprises: design and 
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Geo-Information Science and Earth Observation ITC, 
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[7] J. Morales J. Model-driven design of gco-information 
Services, Ph.D Thesis, ITC, 2004 
[8] J. Morales J and M. Radwan. Extending gcoinformation 
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In Proceedings of the Joint International Symposium on 
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[9] M. Radwan, L. Alvarez, R Onchaga, and J Morales. 
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[10] The openGIS Abstract Specification Topic 12: OpenGIS 
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[11] OpenGIS Reference Model. Version: 0.1.2, No. OGC 03- 
040, Open GIS Consortium Inc., March 2003. Editor: Kurt 
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[12] OpenGIS Web Services Architecture. Discussion paper. 
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January 2003. Editor: Joshua Lieberman 
[13] R. Onchaga. Modeling for quality of services in distributed 
geoprocessing. ISPRS proceeding, Istanbul 2004. 
[14] M. Nasr, M. Radwan. Capacity Building in the Egyptian 
Survey Authority: A Cooperation program with the Dutch 
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