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Image Pr ocessing Systems 131

feature called the Algorithm Librarian. Hundreds of analysis
algorithms accessible in the Algorithm Librarian are grouped into
data interchange, image processing, vector processing, data analysis,
multilayer modeling, and image correction. Repetitive processing
procedures can also be automated by using a scripting language in
Geomatica 10.
Productivity is increased with visually modeled workflows and
command-line scripting. Users can customize workflows by creating
batch processes for all types of data processing and analysis. For
instance, production workflow efficiency is boosted for a set of geo-
spatial tasks such as automated orthorectification, mosaicking, DEM
extraction, feature extraction, and change detection, all of which can
be embedded within existing processes either through visual model-
ing or command-line scripting (Page, 2006). This extremely flexible
and convenient interface allows the user to define their own algo-
rithm categories, thereby giving them quick and easy access to the
frequently run analyses.
Another important module is the Geomatica WebServer suite of
tools that combines three standard geospatial data services (web cov-
erage service, web feature service, and web map service) into one
module. This web server is designed to share and distribute geospa-
tial data more efficiently through the Internet and intranets. It con-
sists of three parts, two of which are a visual environment for various
data, such as imagery, vector layers, and bitmaps; and an applet that
allows the user to roam, zoom, and pan images; and interaction with
the web server. It is automatically downloaded into the user’s web
browser, but is deleted after the user leaves the web site. The last part
is a servlet that coordinates activities between the applet and the web
server.

4.5.3 User Interface
The user interface of PCI has evolved from command driven in the old
days to Windows NT, 2000, and XP. Its GUI is easy to use, intuitive,
and unobtrusive. The tabbed legend frame makes switching on and
off layers and views very easy. Both characteristics and functions can
be accessed with ease from this legend frame. Some users may prefer
an enhancement to this interface by adding dockable panels for dis-
playing algorithm or other libraries, image characteristics like histo-
grams, or frequently used complex tools (Page, 2006). Users may also
wish to interface with the system via command line if using the script-
ing language, a growing trend of providing highly flexible and cus-
tomizable user interfaces.

4.5.4 Documentation and Evaluation
PCI supplies a user guide describing its functions and how to run
some analyses. However, more documents are needed to provide