Clearinghouse and OGC Web Services Overview

Doug Nebert

FGDC Secretariat

December 4, 2001

Presentation Overview

• Web Map CAP Activities– Project Members– Workshop– Architecture– Status

• Clearinghouse Status– Current Environment– FY 2002 Planned Activities

Web Map CAP Objectives

• To demonstrate the integration of information discovery (Clearinghouse) with OpenGIS Web Map Services for the display of found data

• To visualize data from multiple map services at different organizations through an OGC spec-based portal

• To establish 24x7 reliable web map services described in metadata for others to use

Approach

• Awarded to multi-organization projects interested in hosting web map services and map viewing software as part of their Clearinghouse

• Held a week-long workshop at SAIC in September to introduce free and commercial solutions to projects

• Deploy modified FGDC data and services metadata in Clearinghouses

• Use and deploy web map services and viewer software across projects

Workshop Participants

Projects:• NOAA NGDC• North Carolina• New Mexico• Cornell U., NY• Mifflin Co, PA• MetroGIS, MN• Oregon

• Nevada• Idaho• MIT• Arkansas• Alaska GDC• Vermont• CIA

Objectives of the Workshop

• to educate operators of Clearinghouse and map services on relevant OpenGIS specifications and experimental interfaces to view distributed data

• to assist CAP recipients in the extension of their map services to support OGC interfaces

• to introduce linkages between metadata, clearinghouse, and map data display

• to establish communication between CAP recipients and support individuals

Web Browser

WMS Interface WMS Interface

ArcIMS

DataData

Data Data

Data

Organization 1

MS

DataData

Data Data

Data

Organization 2

Metadata Metadata

SearchGateway

Request

Response

Z39.50

Z39.50

Z39.50

Z39.50

s1 s2

OGC getMap

DataData

ClientClient

UserUser

Application ServerApplication Server

CatalogCatalog

Architecture “Roadmap” FGDCFGDCFederal Geographic

Data Committee

Services Web Map ServerWeb Map Server . . .

Interfaces

Plans for WebMapCAPIn the life of these CAP projects we intend to:• Clarify the relationship between data and services

metadata management at the service node (your mapserver/metadata server)

• Establish a registry of eligible WMS capabilities among the CAP and other projects for use in the OGC.net

• Experiment with a broker gateway that will match data content and service requests for the client

• Stand up OGC WMS services at all CAP projects • Establish WMS viewer portals at all CAP project

community portals that include search and display of local and national data sources

Clearinghouse Status

Clearinghouse Statistical Summary 12/01:

• US Gateways: 6

• Total Servers: 281

• Active Servers: 248 (Inactive: 33)

Activities:

• Refining search gateways

• Hosting/coordinating global (GSDI) search

• Improving server registration/management

• Participating in OGC to discuss futures

Search Wizard

• Newer user interface to assist in data discovery

• Includes ISO 19115 topical pick-list• Selects servers based on footprint and topics

of interest• Suggests search words to pass-through• Presents some results as Summary (with inset

map)

Clearinghouse Concepts for 2002

• Mine Clearinghouse Gateway connection logs for user numbers and types, success of queries, popularity of services

• Deploy FGDC-hosted harvester/index/Z39.50 server for metadata from small sites not able to operate their own Node server software

• Continue prototyping integrated search portals linking mapping services with data discovery

• Work with vendors to incorporate Clearinghouse (Catalog) search and service in GIS products

• Participate in OGC standardization activities