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SANI-ITA uses state of the art technologies to extract three dimensional features in an automated, semi-automated or manual manner depending on client applications and accuracy requirements. High resolution fully georeferenced imagery captured
with digital aerial cameras are used by SANI-ITA to undertake digital topographic mapping in support of engineering projects. Topographic mapping output for these projects is delivered in formats such as Microstation or AutoCAD and is accompanied
by detailed digital terrain model data and orthoimagery. Features collected include those that are visible in the imagery such as utilities, roads, curbs and buildings as examples and may include underground services that are collected by
ground surveys and integrated with the topographic mapping data.
Figure 1- Example of engineering mapping carried out by SANI-ITA
Infrastructure & Hazard
Inventory of infrastructure, for instance at municipal level, can be undertaken from aerial or satellite imagery. While the stereoscopic collection can be used, for some applications, 2D mapping from the orthorectified images is also an option. The
output is usually a vector that can be maintained over the years requiring a less expensive approach than acquiring new imagery. SANI-ITA can also assist in hazard mapping projects where image exploitation techniques can be used to establish zones
of higher risk and different hazard types. For example, low lying areas along shores of rivers or lakes, can be accurately mapped using aerial or satellite imagery.
Environment & Landfill
Environmental studies and assessments can be undertaken using multispectral imagery. Different band combinations can reveal aspects less obvious in the original collection bands. A typical example is the vegetation index, enhancing the difference
between healthy vegetation and other classes by using only two bands, Red and (Near) Infrared. A particular case of environmental assessments is represented by landfills. Private companies and different levels of government have the interest of
maintaining records on the creation, maintenance and prospective development of landfills of different types, e.g. waste management. Aerial or satellite images are an efficient starting point for assessing the status and future evolution of landfills.