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National Data Registry role, scope, structure
N. L. Sarda
IIT Bombay
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Outline
• Registry for facilitating data usage
• Scope and role for NDR
• Using standards
• Some case studies
• Approach
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1st step in sharing
Have data to share
What is it ? Is it useful to anyone ?
Metadata - Category - which area (loc, BB) - CRS - time, accuracy, resolution, CRS, … - format (standards ?) - usage terms … - content
? Where do we find this metadata
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Spatial data infrastructure
Have data to share
Metadata registry
Application schema
Ontology
Registry/Repository/Catalog
with API
My application
Publish
Discover
Access data
As a service
processed data Vs raw data
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A federated service
Metadata registry
Application schema
Ontology
Registry
My application
Discover
register
harvest
bind
get/update data
National GIS = NDR + Sources
with API
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Essence of standards
• Precise, unambiguous • Widely accepted • Consumable by people AND applications
– Real inter-operability
• Extendible • Query-able • Proven – create use cases, prototype
implementations
• OGC : for exchange of data/metadata, for spatial, for services, for domains
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Metadata standard
• Provides for the cataloguing of all types of resources, giving full description of datasets and services
• Covers geographic services, geographic datasets, individual geographic features and feature properties
• ISO 19115 package provides for : Citation, Quality, Features, Lineage, Services, Temporal, Reference System, Extent, ….
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To support powerful search across domains
• Using both spatial and thematic attributes
“get locations/areas where soil acidity levels have increased by more than 10% yearly for 5 years and where there are chemical industries nearby”
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9 February 9, 2017
Registry structure : like a library
WRS
ebRIM Registry
Internal XML
Repository
External Image or
Data Set Repository WRS
Client
Internally
Managed
1:1
relationship
Unmanaged
relationship Like a
card
catalogue
Like the books
in the stacks
Like books in
another library
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CSW-ebRIM Interfaces
February 9, 2017 Powering the Geo-Web 10
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Application schema
• Domain metadata
• Cover thematic, spatial and temporal attributes
• Cover permitted values, relationships
• Essential part of metadata registry
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Soil : example
• How to Store data about soil in a country
• The Data within the schema should follow a standard – Increases interoperability
• INSPIRE has done it based on a Standard called WRB (World Reference Base for Soil Resources )
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Soil Core data types
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Standardizng codes and attribute values
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Domain schemas : for each data providing agency
INSPIRE, OGC domain groups, ISO, BIS standards
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Provide API to use your data
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Examples of where we want to reach !
INSPIRE portal Dutch data registry ….
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Themes
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Service Registry Portals
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(Dutch) Data Registry
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Tools for Organizing metadata
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• Powerful search geospatial catalogues
• Uploading and downloading of data
• An interactive Web map viewer that combines Web Map Services from servers around the world
• Online editing of metadata
• Scheduled harvesting and synchronization of metadata (including services metadata)
• Fine grained access control
Main features of metadata tools
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Our NDR Approach
• Create effective use cases
• Work with a few data agencies to make their metadata, data and services available
– Gateway node
– Application schema as well as services
• Build NDR platform – repository (WCS)
• Provide search facility
• Showcase use cases through NDR
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Conclusions
• NDR
– Will be Source for discovering data
– Will be Foundation for geospatial infrastructure
– Will use standards
– Will Cover data, services
• Identify providers, consumers
• Discipline to keep data updated
• Get ready to join NDR !
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Thank you