GIS data sources; catalogs of data and services. USGS: National Mapping.
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Transcript of GIS data sources; catalogs of data and services. USGS: National Mapping.
GIS data sources; catalogs of data and services
USGS: National Mapping
U.S. Bureau of the Census
NOAA: Weather and other data
US GeoDataftp access to
DEMDLGGNIS
GIRASetc.
Why build an SDI?
• Build data once and use it many times for many applications
• Integrate distributed providers of data: Cooperative governance
• “Place-based management”• Share costs of data creation and
maintenance• Support sustainable economic,
social, and environmental development
Standardisation makes SDI work Standards touch every SDI activity
GEOdataGEOdata
DiscoveryDiscovery
FrameworkFramework
StandardsStandards
AccessAccessServices
ProcessingProcessing
Standards include specifications, formal standards, and documented practices
MetadataMetadataMetadataMetadata
Types of geospatial standards Data Classification
e.g., Vegetation Classification
Data Content e.g., Digital Geospatial Metadata, Spatial Schema
Data Symbology or Presentation e.g., Digital Geologic Map Symbolization
Data Transfer Data Services (Web Mapping, Feature) Data Usability
e.g., Geospatial Positioning Accuracy
Definitions• Catalog: Collection of metadata• Catalog Services: methodology that allows search and
retrieval of information from catalogs (OGC)• Clearinghouse: distributed search and retrieval system
that permits multi-server access to catalogs of metadata. Can traverse links through the metadata to online access (e.g. order form, ftp download, map services, data services). (FGDC terminology)
• Gateway: An application server that presents a user interface and API and performs a search of multiple catalogs
• Registry: A searchable catalog of services• Node: A catalog of metadata exposed for search
through a Catalog Service (FGDC terminology)
SDI Implementations
• FGDC Clearinghouse (and a number of state “clones”)
• Canada GeoConnections Discovery Portal• United Kingdom “AskGiraffe” Portal• Australian Spatial Data Directory• UN Geographic Information Working Group• Mexico INEGI • Geography Network
Geography Network
• The Geography Network is a global community of data providers who are committed to making geographic content available.
• This content is published from many sites around the world, providing you immediate access to the latestmaps, data, and related services.
Geography network
• View Live Maps
• Download Geodata
• Build Custom Applications
• Publish Your Content
• Find Useful Tools
• Share Your Ideas
GeoServices -- Tools for the Application Developer
• To assist developers in building applications, the Geography Network offers custom services to perform common geo-processing tasks, such as geocoding, buffering, or routing.
• These "geoservices" can be used by developers to build applications without having to maintain the tools (and associated geographic data) on their local systems.
Client Interfaces
ArcInfo ArcEditor ArcView GIS ArcExplorer Browser
ArcIMS Services
ArcSDE Services
EnterpriseDatabase
Services
DataRepository
How Does It Work
Complex/Analysis Simple Viewer