Diagram 1 : Components of MyGDI
Catalogue Gateway / Portal
MyGDI Catalogue Gateway is a system of institution comprising a distributed network among the producers,managers and users of geospatial information connected electronically, utilizing sophisticated software to facilitate the discovery, evaluation and online access of geospatial data. It is the backbone of MyGDI for the management and dissemination of spatial data in the electronic media. MyGDI Catalogue Gateway & Portal facilitates all data producers and data providers in standardizing the dissemination of spatial data which can be accessed through the Internet.
MyGDI Catalogue Gateway & Portal has the main goal to provide access to metadata directory. The metadata can be linked to a map service for visualisation of the geospatial data. Using distributed system of servers that are connected to the internet, metadata is used to facilitate queries and discovery of data that are provided by the participating agencies.
Metadata is a description about data. It is a structure means of describing the content, sources, condition, quality and other characteristics of a data or information resource. Through metadata, necessary information is readily transferred from data providers to users. MyGDI metadata standard if formatted based on MS ISO 19115-Metadata Referencing by Coordinates, among which includes: identification, data quality, lineage, spatial data representation, reference system, feature catalogue and distribution.
Framework emerges as an important reference to eliminate any issues relating to organizational structure, pricing and privacy. Framework covers data custodianship and digital data pricing. Its focus is on the importance of accountability among data provider to ensure that the government interest is confidential and well protected. The important aspects in framework are:
Well-featured layers of digital geospatial data with content
Technology, policy and guideline that empower the integration, sharing and use of the data
Institutional setup and practice that promote and support maintenance and usability of data
Over the years, framework policies that have been established are:
Geodata refers to a well-defined fundamental geospatial data themes set up mutually among participating stakeholders. It is represented by customary data themes that data users require, as well as environment to support the development and usage of this data on which agencies can create by overlaying their own information and thematic data with framework dataset. Through the mutual conception, several government agencies or geospatial industry groups can define reliable data themes to accomplish their common objectives.
Use of geospatial information by wider audience and across applications creates a need for standards to ensure the reliability and effectiveness of the services that depends on the information. In the data sharing and exchange, there are three types of geospatial related standards, access standards and exchange standards.
Content standards include land parcel identifier, features and attributes code catalogue and geographic place names; access standards take into account standards in data communication such as ISO 19100 series for geographic information; while exchange standards include XML and GML.
The following standards have been applied in the development of MyGDI such as the Unique Parcel Identifier (UPI) for cadastral data, the MS1759, Metadata Standard Based on ISO/TC211 and GIS Standards: Coordinate Reference System, Terminology, Quality Principles, Imagery and Gridded Data Components, and Conformance and Testing Data Quality based on ISO/TC211.