Transcript GSDI-6 Pre-conference Workshop: Standards in Action

Interoperability in GSDI:
Standards, Solutions, and Futures
Douglas Nebert
GSDI Secretariat
Workshop Agenda
14:00 Introduction (Nebert)
 14:10 International Standards ISO TC
211 (Ostensen)
 14:35 OpenGIS Consortium Specs
(Reichardt)
 15:00 National Community Standards
(Nebert)
 15:20 Break

Agenda, Continued
15:30 Geographic Information for
Sustainable Development
(Bacharach)
 16:00 Australian SDI: Support for
National to Local Interests (Kelly)
 16:30 Standard Components for
Developing SDIs in Spain (Zarazaga)
 17:00 Implementing ISO 19115/23950
(Danko)

Interaction of Standards Authorities

Many standardization activities exist
with different roles and
responsibilities that are relevant to
implementing SDIs:
– International Organisation of Standards
(ISO TC 211, TC 204, JTC-1)
– World Wide Web Consortium (W3C)
– OpenGIS Consortium (OGC)
– National Standards Organizations
Community Standardization
GSDI
Regional
SDI Coordination
Software interfaces
(Implementation
Specifications)
OpenGIS
Consortium, W3C
Other
NSDIs
Endorsed
practices and
specification
s
SDI
ISO TC 211
Foundations for
implementation.
(Abstract standards)
National
Standards
Content standards,
Authority for data
Standards Stack
Interoperability Layers
Interoperability
Service
Integration &
Workflow
Service
Discovery
Service
Description
W SFL, XLANG, ISO19119
UDDI,OG C-Catalog,etc.
W SDL,ISO-19119, etc.
Service
OG C SF, Coverage, Coordinate
Transf orm,W MS, etc.
Binding
HTTP, SOAP, COM, CORBA, SQL, J2EE, etc.
Data Format,
Schema and
Semantics
Data
Representation
& Encoding
Communication
Protocols
Connectivity
Interoperability Standards
HTML, XML/S, RDF, XMI,OG C-G ML,
OG C-WKT/WKB, etc.
ASCII, ASN.1/DER, XML, etc.
TCP /IP , HTTP , SSL, SMTP , FTP ,
IIOP , etc.
National/Community Interest
Standards
Doug Nebert
GSDI Secretariat
Scope of National Solutions
Data Content Standards
 Geographic Location Gazetteer
 Geodetic Reference Systems
 Feature Type Catalogs
 National Information Profiles of
International Standards
 Data Policies and Laws

Data Content Standards
Specify semantics and syntax for
information exchange for a specific
theme of data
 May define core or comprehensive
“packaging” of spatial data
 May be expressed as an ISO
Application Schema
 Supports usage in OGC interfaces

Interoperability based on a common data
model for data exchange
Common
Content
Model
import
Mission
System 1
API
export
Core
Framework
Encoding
API
Mission
System 3
export
API
import
Mission
System 2
Common Elements
Feature types (classes) included
 Unique feature identifier system
 Basic attributes
 Controlled vocabulary, codes,
authorities
 Valid at a range of scales and
resolutions
 Multiple representations of same
features possible

Design Process
Community
6. Forward Committee
Draft to National
Review and Approval
3. Review
1. Requirements
4. Comments
ApplicationNeutral
Content Model
2. Design
5. Refine
Modeling Advisory
Team
Encoding
(XML)
Standards Process for Geospatial One-Stop
Requirements Team
Extract data
requirements
Portal Team
Standards Teams
Compose/
convene
7 MATs
Write draft
std docs
Extract common
data
requirements
Construct
Draft Model
Construct
Draft
Standard
Vote at
ANSI INCITS
L1
revise
Calls for requirements
and participation
Public
Review
FGDC
Endorsement
Vote at
ANSI
revise
Public
Review
Generalized Modeling Approach
Universe of Discourse
(each of 7 communities)
Conceptual
Model
Feature Model in UML
expert intervention
Application
Schema
Conceptual Model using
ISO 19118/19103 objects in UML
UML-XML encoding transform
Data Transfer
Schema
Common Community Data
Transfer in XML-Schema (GML)
XML validation
Encoded Feature Data in XML
What is the Geospatial One-Stop
Portal?

Middleware that integrates access to
distributed community data services
 Community-wide access point for all
participating data and map services
 Employs standard software interfaces
to connect to catalog, map, and feature
services set up by providers
 Generic user interface that could be
adapted by other communities
Portal Concept
Web Browser (Thin Client)
Applications (Thick Client)
Internet
User Interface
Widgets
@FGDC
Geospatial One-Stop Portal
Analysis
GNIS
Symbols
Help
Gaz WFS WMS WCS Cat
Clients
Internet
Services
Data
Provider Organizations
Framework Interoperability
Pilot for Transportation

OpenGIS Consortium (OGC) will assist in
modeling process to define proper UML
that conforms to ISO rules and can be
implemented as GML
 Engage OGC members in implementing
Web Feature Services to extend multiple
available data systems (U.S. and Canada)
 Demonstrate a Web client that can display
and query multiple Framework data
sources based on a common data model
 Approach to be followed for other themes
OGC Web Feature Service
WFS
Web Feature
Browser/
Client Application
GML
(XML)
Mission
System A
translation
utilities
Native Format
Mission
System B
WFS
public
schema
P
B
transformation
rules
private
schema
Geographic Location Gazetteer

Names of geographic places should be
identifiable with unique IDs for easy
reference and usage
–
–
–
–

First-order Subdivision (Province)
Second-order Subdivision (District)
Populated places
Named landscape features
Establishment of online gazetteer by each
nation is a useful service
Geographic Name Resolution
(OGC Gazetteer Profile of WFS)

Online service protocol is being
developed to query geographic name
servers to assist in relevant place name
and coordinate assignment
 Metadata collection (cataloguing) can
benefit from access to Web service to
encode place as name and coordinates
 Geospatial search will benefit from
stronger match of place to coordinates
Gazetteer Interaction
User
Place Name
and Context
Web-based
application
Structure
Request may include
ambiguous place type
and name or coordinate
Gazetteer
Service
Response should include
context but must include
spatial coordinates
Metadata Encoding
User
Metadata
Encoding
System
Place Name
and Context
Structure
Gazetteer
Service
Metadata Search Support
User
Metadata
Search
System
Metadata
(Catalog)
Servers
Place Name
and Context
Structure
Gazetteer
Service
Geodetic Reference Systems
Selecting and conforming to a national
or trans-national horizontal and vertical
datum
 Many new systems consistent with
geoid-based solutions (useful with
GPS)
 Ability to also report data in
geographic (latitude, longitude,
decimal degrees) helpful in regionalglobal analysis

Feature Type Catalogs

Development of national online
catalog for “well-known” classes of
features and attributes:
– Definition
– Authority
– Relationships

ISO has feature cataloguing
methodology to assist in solution
National Information Profiles of
International Standards
ISO standards are typically adopted
by national members as National
Profiles
 Profiles permit clarification,
localization, and extension of ISO
content
 Coordination or common adoption of
multi-national profiles is desirable

Examples of Profiles
Metadata
 Feature Catalogue
 Application Schemas

Data Access Policies and Laws
Review existing Information
Technology legislation and policies
 Establish data exchange policies
 Address privacy, intellectual
property, and security issues
 Define terms of participation in
national SDI environment

GSDI-6 Pre-conference Workshop:
Standards in Action
Douglas Nebert
GSDI Secretariat
Agenda, Continued
16:00 Geographic Information for
Sustainable Development
(Bacharach)
 16:30 Australian SDI: Support for
National to Local Interests (Kelly)
 17:00 Standard Components for
Developing SDIs in Spain (Zarazaga)
