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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B4. Istanbul 2004
e Raster (Image) Compression and
decompression Software Tools.
Raster Product Management
The raster product management component will
provide the functionality to manage the raster files
(TIFF, GeoTIFF, ECW, MrSID, etc.), the metadata
about the online (digital) and offline (negatives, etc.),
metadata about collections (Air Photos, Satellite
Imagery) of raster and other metadata (Flight Lines).
The management applications should manage both the
metadata and the files as a single asset within the
management system. Additionally, this component
must publish raster and metadata to the Land
Resource Data Warehouse (LRDW).
This functionality shall be implemented as a custom
extension of the existing BMGS Air Photo System to
support the raster files and other types of raster
metadata.
Raster File Access
The raster file access component of the DIM system
will provide the functionality for clients to access the
raster in the DIM system over the Internet. The file
access server should provide functionality to access
the entire original raster, a portion of the raster or a
resized portion of the raster. It must also support
and/or integrate the security functionality from the
Raster Order Placement and Fulfilment component.
Raster Discovery
The raster discovery component will provide the
facilities to enable users to search for raster products
using a spatial and metadata filter. Image metadata
will be developed according to ISO//TC211 standards.
The result should be displayed as a list and an option
to display the photo centres and footprints on the
index map. The discovery application should also
include an index map that displays the base map of
BC and should also support connection to an OGC
Map service to get the layers for display.
Raster Order Placement and Fulfilment
The raster order placement and fulfilment component
will provide shopping cart functionality for the raster
discovery application in order to add products to a
user's order. The component should also provide a
pricing service for the products and online/offline
order fulfilment and workflow.
Requirements
The DIM system and its components have the
following common requirements:
e Meets all system requirements as detailed in
the DIM System requirements document
available on the DIM web site.
e Meets all applicable MSRM standards.
MSRM standards are available at:
http://srmwww.gov.be.ca/imb/3star/index.ht
mi.
eo Performance, functional, and system
requirements are proven through adequate
system, integration, and regression testing.
333
5. CONCLUDING REMARKS
The Digital image Management program will provide
a managed environment for storing and accessing
raster data on an ongoing basis. Data types of
principal interest include aerial photographs, satellite
imagery, digital elevation models, and a variety of
derived products from these fundamental data
sources. In addition to these diverse raster data sets,
DIM will handle the corresponding ISO/TC211
standard metadata. Many users will benefit from a
simplification of business processes that make use of
such raster data now, or potentially could in the
future.
British Columbia has been a leader internationally in
the use of aerial photography beginning in the 1940s.
Since the early 1980s the same has been true of its use
of satellite imagery. More recently with the Terrain
Resource Information Management (TRIM) program,
British Columbia has emerged in the forefront of
digital aerial photography. The overall justification
for this sixty year endeavour has been the tremendous
benefit that such data provides to a large variety of
resource and socioeconomic applications. Because
BC is so large (95 million hectares) and so varied,
because the land is owned predominantly by the
Crown, and because the population is so small relative
to the land base, digital mapping and digital imagery
have played a particularly significant role in
managing the Province.
A number of reasons exist for pursuing the DIM
program at this time. These include the following:
e Duplication of specific image files and of
image stores in general will be eliminated.
e The online orthophoto mosaic (built as part
of the initial work on DIM) will be extended
to accommodate all current
orthophotography, thereby increasing its
relevance to many users interested in the
new data.
e Increased number of data types will be
supported, with new types to include
satellite imagery and stereo pairs.
e Metadata will be put into place to facilitate
exploration and access by managers and
users alike.
e An update process will be built that will
allow for new raster data, and its
corresponding metadata, to be added readily
to the DIM system.
e Dynamic generation of derived imagery will
support resampling and reprojection, thus
eliminating the need to store multiple
versions of the same data at different
resolutions and in different projections.
e The access time to raster data will decrease
measurably because of higher performance
software, thus improving the user
experience.
e Off-loading raster data from the ArcIMS
application will lead to better performance
with the vector data that ArcIMS serves.
