International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B2. Istanbul 2004
Interactive campus maps are presented to the user in two
different layer structures. The user can query over the plan view
of the campus that contains roads, buildings, and other facilities
(Figure 3), as well as over the terrain views which are generated
from raster based orthophotos (Figure 4). The user can zoom,
pan, and scale the area in order to search roads, buildings,
parking lots, and other facilities around the campus. When
clicked on any building on these views, information about
academic and admission departments in this building is
displayed and related web pages are also listed.
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Figure 4. Ortophoto View of The CIS
Interactive Campus Information System, a server based
application, was developed according to thin client architecture
procedures. Server based GIS applications generate HTML
files. In this system, user actions such as zooming, pan,
selecting an object or a polygon, and data accusation are
transmitted to the server, and related graphical and written data
are managed by the server, then, these data are presented to the
client in HTML format.
Client based scripts are used to perform interactive features on
the online maps. This is done by keeping the coordinates of
every map objects into a script located on the web page. When
a user clicks on anywhere between these coordinates, graphical
and specific data about the objects are displayed in a normal
HTML connection.
Another group of object on interactive maps is viewpoints. The
image generated by the pictures taken at characteristic points
(viewpoints) of the campus provides an idea about the general
view of the campus area. By clicking on the viewpoints, one
can see the panoramic view of that point, which can rotate 360
degrees (Figure 5). The user almost feels like he is actually
walking around the campus by using the graphical features such
as zoom-in, zoom-out, pan, and rotation.
Panoramic Viewpoints Panoramic View from the Pool
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Web based Campus Information System of GIT can be reached
at www.gyte.edu.tr/jeodezi/K BS.
3.2. Application 2
This section presents an example of the second type spatial
based e-government application, which is developed to access
the parcel based official documents on internet. The purpose of
generating this prototype is to transmit the spatial government
documents (cadastral plans, construction permission plans, land
usage plans, application plans, etc.) to related person and
agencies in electronic environment using e-gverment
applications.
In parcel based webGIS applications, considering that potential
users will be ordinary people with limited computer knowledge,
it is aimed to prepare the required documents automatically, as
a user enters the minimum data (parcel number).
This application is generated using fat client architecture and it
is a client based application. Once logging in to the system, an
ActiveX component is downloaded and added into the user’s
browser. This component improves the browser's functions and
transforms it to software, which meets the objectives of the
system. The component, written in Visual Basic 6.0 platform, is
interactive software.
When a user enters the parcel number to display its document;
firstly, this number is transmitted to the server; secondly, Visual
Basic scripts in Active Server Pages starts running; then,
information about this parcel are pulled out from the data base;
and finally, this information are sent back to the user's
computer. The software added into the user's browser analyses
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