The Location of each building is a
necessary data for planning of disaster, resource management, infrastructure development,
service providing etc. Traditionally, the building boundaries are delineated
through manual digitization from digital images in stereo view using the
photogrammetric stereo plotters. However, this process is a tiresome and time
consuming task and requires qualified people and expensive equipment. For this
reason, building extraction using the automatic techniques has a great
potential and importance. In developed countries automatic building extraction
is being increasingly used for urban planning and management. Therefore, it has
been the focus of intensive research for the last decade.
When comparing with other convenient
method of Survey, the satellite imagery is cost and time effective. However, in
Sri Lanka not enough research in this content and still no organization has
considered this technology.
Several case studies carried out in
other countries in urban area building extraction. In most of the developed
countries urban building have some similar characteristics such as built
materials, shape and texture. But in Sri Lankan rural context is completely different
in the aspects of building materials, different shape of buildings and no any
patterns. All of above the canopy cover is the great challenge.
Due to these differences Sri Lanka requires
a specific research to identify the proper algorithm and implementation mechanism
for time and cost effective building location data collection from high
resolution multi spectral satellite imagery.
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