8-Lecture14
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Geoportals<br />
Lecture 14
Metadata and Meta-standards 2.0<br />
– Geospatial metadata refers to the information that<br />
describes geospatial information, web services, or<br />
other geospatial resources<br />
– Importance to Geoportals<br />
• Represents “who, what, when, where, why and how “
Metadata and Meta-standards 2.0<br />
– Metadata defines the following<br />
• Identification<br />
• Quality<br />
• Spatial Reference<br />
• Temporal Information<br />
• Distribution Information
Metadata and Meta-standards 2.0<br />
– Uses of metadata<br />
• Discovery of resources<br />
• Evaluation of resources<br />
• Use of resources<br />
• Contract between user and the provider
Metadata and Meta-standards 2.0<br />
– Geo-spatial metadata standards<br />
• A metadata standard is a common set of terms and<br />
definitions that describe geospatial resources<br />
– Dublin Core<br />
– FGDC Metadata<br />
– ISO Metadata standards
Metadata and Meta-standards 2.0<br />
– Metadata 2.0<br />
• Metadata which should be user-centric, easy for<br />
contributors to create and easy for users to understand<br />
• Metadata 1.0 = Professional / Organizations<br />
• Metadata 2.0 = Users
Distributed vs Centralized Catalogs<br />
– Distributed Catalogs
Distributed vs Centralized Catalogs<br />
– Distributed Catalogs<br />
• Difficulty in conducting a global search<br />
• Limitations in performance<br />
• Difficulty in sorting the results consistently<br />
• High requirements for participant providers
Distributed vs Centralized Catalogs<br />
– Centralized Catalogs
Distributed vs Centralized Catalogs<br />
– Centralized Catalogs<br />
• Easy to conduct global searches<br />
• Easy to sort results consistently<br />
• High performance<br />
• Low requirements for participant providers
Geoportal case studies<br />
– Reading assignment<br />
• Page 158-165
Challenges and Prospects<br />
– Handling the complexity of metadata<br />
– Supporting Semantic Search<br />
– Protecting Copyright<br />
– Data Mining
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