The GeoConnections Discovery Portal

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The GeoConnections Discovery Portal Technical
Overview March 16, 2003 Michael Robson,
robson_at_mda.ca Michael Adair, mike.adair_at_ccrs.nrc
an.gc.ca MacDonald Dettwiler / GeoConnections Nat
ural Resources Canada/GeoConnections 2060 Walkley
Road 615 Booth St Ottawa, Ontario,
Canada Ottawa, Ontario, Canada
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Materials On-Line
http//ceodev.ccrs.nrcan.gc.ca/geotec/GeoTec-TechW
orkshop-2003.ppt http//ceodev.ccrs.nrcan.gc.ca/ge
otec/front-end20interfaces.doc
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Resource Publishing Paradigm
Value Added Supplier
Primary Data and Service Suppliers
Consumer
Discovery Portal
Suppliers Publish Resource Descriptions Consum
ers Discovery of Resources
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Consumer Paradigm for Resource Access
Evaluate Resource
Discover Resource
Access Resource
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Architecture One Portal Among Many
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Architecture Interface Levels
Business Layer Interfaces
Front-end Interfaces
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Front-End Interface Basics
Common Parameters displayHeader true
false language en fr action
choose from list of actions
entryType choose from list of entry types
Display Home Page http//geodiscover.cgd
i.ca/gdp/index.jsp?
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Business Layer Interface Basics
All business layer and back-end interfaces at
http//geodiscover.cgdi.ca/ceonetWeb
Note eventually, all business layer interfaces
will be moved out of the back-end.
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Agenda
Scenarios - service - architecture
- interfaces
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Scenario 1 Data Products
Supplier
Supplier
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Scenario 1 Data Products
Supplier
Find
Publish
Advertising
Advertising
Discovery
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Supplier
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Scenario 1 Data Products
Supplier
Find
Publish
Advertising
Discovery
There are over 12,000 Data Products described
in the Discovery Portal
Supplier
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Where Do All These Entries Come From?
Discovery Portal
Federated Directory
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Types of Data Entries
Collections of Satellite Images
Collections of Maps
Collections of On-Site Measurements
Results of Studies
Web Map Layers
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Types of Data Entries
Models
Individual Products
Atlases
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Data Products Data Model
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How is the Metadata Represented?

• Metadata Content Standard
• Content Standard for Digitial GeoSpatial
  Metadata (CSDGM)

• Defined by the Federal Geographic Data Committee
  (FGDC) of the U.S. Geological Survey (USGS)

• The Content Standard is commonly referred to as
  just FGDC

• http//www.fgdc.gov/metadata/contstan.html

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ISO 19115 1/2

• Internationally (almost) endorsed standard for
  Geographic Metadata

• Multilingual profiles can be made

• The standard is an abstract standard - profiles
  of the standard must be created in order to be
  used

• The U.S. is agreeable to co-endorsing a profile
  with Canada. The profile would have separate
  cover sheets to be endorsed by the Canadian
  General Standards Board (CGSB) and ANSI in the
  U.S.

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ISO 19115 2/2

• The U.S. is developing an XML implementation
  scheme prior to the profile work

• This will output an XSD that is to be endorsed as
  ISO 19139

• Expected to be completed by end of this year

• Canada has created a bilingual profile

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Architecture Basic Internal Architecture
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Architecture Subsystem Servlets
Note - advertising API is not in scope for this
workshop
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Data Products Front-End Interface
Display Data Search Form http//geodiscover.cgdi.c
a/gdp/search?actionsearchForm entryTypeproduct
Collection
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Data Products Front-End Interface
Get List of Entries for Data http//geodiscover.cg
di.ca/gdp/search? actionlistEntries entryType
productCollection selectionCriterion a-z
all other nonAlpha
hasSearchService isFree
isFreeCanadian numResultsPerPage
n page n
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Data Products Front-End Interface
Search for Data http//geodiscover.cgdi.ca/gdp/se
arch? actionexecuteSearch entryTypeproductCol
lection keywords see keyword description
in Appendix A numResultsPerPage n page
n northbc /-nn.nnnwestbc
/-nnn.nnn eastbc /-nnn.nnn
southbc /-nn.nnn chkIncludePlaceName on
off chkIncludeCoords on off
chkAllowOverlap on off chkAllowGlobal
on off
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Data Products Front-End Interface
fromMonthnnfromDaynnfromYearnnnntoM
onthnntoDaynntoYearnnnn
locationNameltselection from list - see Appendix
Agt example /northAmerica/canada/brit
ishColumbia subjectltselection from list -
see Appendix A example
subject/landSurface/landUse
subjectltselection from list - see Appendix A
example productType/mapsChart
s
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Data Products Business Layer Interface
http//geodiscover.cgdi.ca/ceonetWeb
Data

• Get list of entries

• Search for entry
• boolean search expression

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• Get entry

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Scenario 2 Organizations
Supplier
Find
Publish
Advertising
Discovery
Advertising
Database
Supplier
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Scenario 2 Organizations
Supplier
Find
Publish
Discovery
Advertising
Advertising
Discovery
Supplier
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Scenario 2 Organizations
Supplier
Find
Publish
Discovery
Advertising
Advertising
Supplier
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Organizations Data Model
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Associations Organizations - Data
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Organizations Front-End Interface
Display Organization Search Form http//geodiscove
r.cgdi.ca/gdp/search? actionsearchForm ent
ryTypeorganization
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Organizations Front-End Interface
Get List of Entries for Organizations http//geodi
scover.cgdi.ca/gdp/search? actionlistEntries e
ntryTypeorganization selectionCriterion
a-z all other nonAlpha
numResultsPerPage n page n
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Organizations Front-End Interface
Search for Organizations http//geodiscover.cgdi.
ca/gdp/search? actionexecSearch entryTypeorga
nization keywords see keyword
description in Appendix A numResultsPerPage
n page n location ltsee Appendix Agt
example britishColumbia
cdnOrgType ltsee Appendix Agt
example commercial
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Organizations Business Layer Interface
http//geodiscover.cgdi.ca/ceonetWeb
Organizations

• Get list of entries

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• Search for organization

• Get entry

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Scenario 3 Remote Products
Supplier
Publish
Discovery
Advertising
Advertising
Advertising
Update with Search Server Address
Configure
Supplier
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Scenario 3 Remote Products
Supplier
Find
Publish
Discovery
Advertising
Advertising
Discovery
Update with Search Server Address
Evaluate
Results
Configure
Query
Search
Search
Bind
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Scenario 3 Remote Products
Supplier
Find
Publish
Discovery
Advertising
Advertising
Discovery
Update with Search Server Address
Evaluate
Results
Configure
Query
Search Server
Search
Search
Access
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Remote Site Distributed Searching
Data Supplier
Search service sends out several searches
to relevant targets
Web Browser
Service Supplier
Peer Directory
DistributedSearchService
Consumer or Application submits a single search
OGC Services Directory
Other national SDI
Marine SDI
Client Application
Provincial SDI
National Atlas
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Z39.50 Search and Retrieval Protocol
Example z3950s//myserver.mydomain.com/productD
atabase
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Z39.50 Search and Retrieval Protocol
Example z3950s//myserver.mydomain.com/productD
atabase
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Z39.50 Search and Retrieval Protocol
Stateful Specification

• Title
• Online Linkage
• Bounding Coordinates
• Extent
• Publication Date
• Beginning Date Ending Date
• Browse Graphic
• Entity Type Label
• Attribute Label
• Data Set G-Polygon
• Browse Graphic File Name
• Browse Graphic File Description Browse Graphic
  File Type

Z39.50 Search Server
Search Client
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Z39.50/Geo Sources and Resources
Information Retrieval (Z39.50) Application
Service Definition and Protocol
Specification http//www.niso.org/standards/resou
rces/Z39-50-200x.pdf
Z39.50 Profiles http//www.loc.gov/z3950/agency/pr
ofiles/profiles.html
Z39.50 Application Profile for Geospatial
Metadata or "GEO" http//www.blueangeltech.com/sta
ndards/GeoProfile/geo22.htm
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Remote Site Ordering Services
The Discovery Portal will invoke email ordering
for a product - if the online linkage starts
with mailto
The Discovery Portal will invoke a remote order
basket for a product - if the online linkage
contains the text remoteOrder
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Architecture Remote Site Servlet
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Remote Site Business Layer Interface
http//geodiscover.cgdi.ca/ceonetWeb
Introduction to Remote Site API
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Scenario 4 Services
Supplier
Find
Publish
Discovery
Advertising
Advertising
Advertising
Data
Develop/Maintain
Configure
Supplier
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Scenario 4 Services
Supplier
Find
Publish
Discovery
Advertising
Advertising
Advertising
Discovery
Evaluate
Data
Develop/Maintain
Services
Configure
Bind
Supplier
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Services Data Model
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Services Associations
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Services Front-End Interface
Display Service Search Form http//geodiscover.cgd
i.ca/gdp/search? actionsearchForm entryTyp
eservice
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Services Front-End Interface
Get List of Entries for Services http//geodiscove
r.cgdi.ca/gdp/search? actionlistEntries entryT
ypeservice selectionCriterion a-z
all other nonAlpha
isFree isFreeCanadian
numResultsPerPage n page n
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Services Front-End Interface
Search for Services http//geodiscover.cgdi.ca/gd
p/search? actionexecSearch entryTypeservice
keywords see keyword description in
Appendix A numResultsPerPage n page
n serviceType ltsee Appendix Agt
example DiscoveryAccess
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Services Business Layer Interface
http//geodiscover.cgdi.ca/ceonetWeb
Services

• Get list of entries

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• Search for services

• Get entry

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Scenario 5 CGDI Web Services
Supplier
Find
Publish Web Services
Discovery
Advertising
Advertising
Data
Develop/Maintain
Services
Configure
Supplier
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Scenario 5 CGDI Web Services

• Catalogue Services
• Sensor Collection Services
• Web Coverage Servers
• Web Feature Servers
• Gazetteer Services
• Web Map Servers
• Web Registry Services
• Search services (Z39.50 GEO)

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Scenario 5 CGDI Web Services
Supplier
Find
Publish CGDI Web Services
Discovery
Advertising
Advertising
Advertising
Discovery
Evaluate
Find
Data
Develop/Maintain
Services
Configure
Supplier
Bind
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Web Services Interfaces
Front-end and Business-Layer interfaces are the
same as for regular services
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Scenario 6 CGDI Web Services Data

• Discovery Portal Directory
• Feature Data in GML format
• Web Map Contexts
• Styled Layer Descriptions (SLDs)
• CGDI Web Services Catalogue
• Web Map Layers

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Scenario 6 CGDI Web Services Data
Supplier
Find
Publish Web Service Data
Discovery
Advertising
Advertising
Advertising
Advertising
Data
Develop/Maintain
Services
Configure
Supplier
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Scenario 6 CGDI Web Services Data
Supplier
Find
Publish Web Service Data
Discovery
Advertising
Advertising
Advertising
Discovery
Find
Data
Develop/Maintain
Services
Configure
Supplier
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Scenario 6 CGDI Web Services Data
Supplier
Find
Publish Web Service Data
Discovery
Advertising
Advertising
Advertising
Discovery
View
Find
Evaluate
Data
Develop/Maintain
Services
Configure
Find Web Map Layers
Web Map Layers
Supplier
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Web Services Data Interfaces
Front-end and Business-Layer interfaces for Web
Services Data

• Search for web services data

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ReUsable Components (RUCs)
RUCAPI
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ReUsable Components (RUCs)
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For each componentOverviewTutorialDemoRe-use
instructionsTag specificationTag WizardLink
WizardSee free developer tools link on the
home page
RUC Developer Tools - Wizards
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Architecture Basic Internal Architecture
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Architecture Business Layer and HMI Contexts
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Architecture External Interfaces
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Business Layer Integration Examples
http//ceodev.ccrs.nrcan.gc.ca/geotec/GeoTec-TechW
orkshop-2003.ppt http//ceodev.ccrs.nrcan.gc.ca/ge
otec/front-end20interfaces.doc
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