International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B4. Istanbul 2004
2. DESIGN OBJECTIVES
The primary design objectives of the DIM system are such
that:
e The entire system must operate on the Internet
using standard browser technology.
e The system must provide access to the
government digital image data holdings.
e Users should be able to download “original data
“in a reasonable time without training or special
software. (Note: large file sizes will be
addressed through data compression and
improved bandwidth.).
e The system must require minimal maintenance
by network and system staff.
e The system must utilize standard computing
hardware that can be easily integrated with
existing services, equipment, and personnel.
e The system design must be extensible and based
on Standard Off-the Shelf Software (SCOTS)
when feasible.
e The system must work with the hardware and
software that B.C. government currently uses to
manage other geo-referenced data.
e The system must be able to deliver raster image
data to a vast array of different client
infrastructure and application environments.
3. SCOPE
The scope of the DIM program has not changed
following the initiation of the program in year 2001.
The re-structuring and amalgamation of BC resource
ministries has had an effect on the alignment of the
stakeholders and the potential for changes in the
coordination of the delivery of the DIM program.
. The DIM program has been reconfigured into three
phases to accommodate the broader corporate IT
infrastructure of the BC Ministry of Sustainable
Resource Management (MSRM) and to realize some
short-term delivery successes. It should be noted that
there would be many projects that are undertaken
within each of the three phases. The three Phases are:
Phase I
Phase I included various activities, including a review
and assessment of the data management and technical
architecture requirements for digital imagery as well
as recommendations for future development. There
are a number of reports produced for this phase. They
are:
e Duta Management Architecture and
Recommendations.
* Transition Strategy and Migration Plan.
e Current Assessment and Future Direction.
e Software Evaluation and Selection Criteria.
e Migration Strategy.
Each of these documents is available on the DIM
program website at:
eo http://www.gov.bc.ca
These reports are the primary references to the design
objectives and the implementation of the DIM
program for Base Mapping and Geomatic Services in
332
British Columbia. The content and direction outlined
in these reports lays the foundation for the long-term
structure of the DIM program. The design proposal
was constrained by the Data Management Review
documents for BMGS. Changes to BC government
organization and IT architecture compelled a review
and acceptance of the recommendations made in this
report. The vetting of these reports has been rolled
into Phase II to ensure consistency with the current re-
architecture of the MSRM corporate IT infrastructure.
Phase II
The scope of Phase II includes:
e A governance model for the program.
e Prove of concept by the delivery of
orthophotos to internal government desk top
applications as short-term solutions to
image access.
e Program plan for Phase Ill.
Phase IH
The scope of Phase III includes:
e Long-term digital image delivery through
Internet and integration into MSRM data
warehousing.
se DIM program architecture consisting of
image cataloguing, database management
including imagery and metadata, software
and hardware selection and acquisition, and
access.
e Service delivery model.
e Ongoing program management and policy
review issues.
Data Sources
The basic image data contained within the scope of
the program will be from these sources:
e Digital raw imagery scanned from the aerial
photography diapositives or predominantly
the negatives.
e Orthophotography which are created from
digital raw images that have under gone
significant photogrammetric processing to
create an "image map “.
e Satellite digital imagery, which are ortho-
rectified, and raw satellite imagery such as,
Landsat, IRS, IKONOS, SPOT, and Quick
Bird.
e Digital Elevation Models (DEM).
e Stereo Models for Photogrammetric map
productions.
4. DIM SOFTWARE COMPONENTS
The seven primary software components of the DIM
program are as:
e Raster (Image) Management Applications.
e Raster (Image) File Access Server.
e Raster (Image) Discovery Application.
e Raster (Image) Order Placement and
Fulfilment Application.
e OGC Compliant Web Feature service
(WFS) Server.
e OGC Compliant Web Map service (WMS)
Server.
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