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Objective
To create a database from bedrock geology maps that can be searched,
evaluated and accessed consistently to provide scalable digital
geological coverages for any user-defined region. These coverages
will be interoperable with other geoscience coverages, at an appropriate
resolution, and customizable by the user to address a variety of
themes.
Approach
A standard data model must be used to ensure interoperability. The
decision was made to use the
North American Data Model, (NADM) with slight modifications.
The modifications are necessary to be able to work with distributed
databases, to easily link attributes and concepts from several sources,
and to conform to the CGKN
metadata profile.
 Scalability
is being accomplished linking the lithostratigraphic classification
of map units used in field mapping to those from regional maps based
on concepts such as tectonic assemblage and tectonic terrane.
To provide effective
querying of distributed databases, a common geological time scale
was adopted as well as standard indexes developed for map units
based on lithological characteristics (composition, texture, fabric
and genesis) to aid searches based on these simple themes.
An OGC-compliant
(Open GIS (Geographic Information
Systems) Consortium), map-based web interface is being developed
and will be used by all distributed NADM databases involved in the
project.
Future
The project group continues to meet to finalize the development
and maintenance of the database, including the refinement of regional
map unit hierarchies and the standard indexes of rock characteristics.
The group also plans to develop new projects to further enhance
the accessibility of bedrock geology information.
Links
North
American Data Model
CGKN Metadata
Profile
Open GIS
Participants
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