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Abstract
Analyzing of UltraCamD Digital Aerial Camera Images for Land Use Classifications (Case Study: Tehran City, Iran)
Bahram Salehi
Lecturer
Marvdasht Islamic Azad University,
Email: b_salehi@sina.kntu.ac.ir
Digital aerial cameras are largely replacing analogue cameras. This is due to some inherent properties of such digital cameras. The main advantages of digital cameras can be summarized as: the ability to produce a higher overlap, up to 90% along track without additional expenses for film, the much higher quality in digital terrain model (DTM) production, the all digital workflow with its inherent properties and finally one of the important benefits of such digital cameras is the multispectral capability. Among a few number of digital cameras, UltraCamD is a large format camera of Vexcel Imaging which was introduced in May 2003. UltraCamD offers simultaneously sensing of high resolution of panchromatic channel as well as lower resolution RGB and NIR channels. Thus beside the large-scale map production the images of this camera have the benefit of land use classification. In this research, using a full band image (Pan, RGB, NIR) of UltraCamD, land use classification was done. The image that was used in this research is an image of a region of Tehran in summer 2006. Land use classification procedure was done in two steps: the first step is the initial classification of vegetation area and no vegetation area. The vegetation area includes lawn and different type of trees and the no vegetation area includes building and streets. The second step in classification procedure is the improvement of initial classification resulted from the first step by using the digital surface model (DSM) generated by stereopair panchoromatic images. The results of this paper shows that in addition to the large-scale map production the UltracamD images have a very high potential in producing the land use classification maps and this is due to the multispectral capability of such images.
Key Words: Digital Aerial Camera, UltraCamD, DTM, Land Use Classification.
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