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