GIS data sources; catalogs of data and services

USGS: National Mapping

U.S. Bureau of the Census

NOAA: Weather and other data

US GeoData ftp access to DEM DLG GNIS GIRAS etc.

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

F Standardisation makes SDI work F Standards touch every SDI activity GEOdata Discovery Framework Standards Access Services Processing Standards include specifications, formal standards, and documented practices MetadataMetadata

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

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 latest maps, 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 ArcInfoArcEditor ArcView GIS ArcExplorerBrowser ArcIMS Services ArcSDE Services Enterprise Database Services Data Repository How Does It Work Complex/Analysis Simple Viewer

Access From Where? XML XML / JPEG