Evaluating the quality of free and open source softwares for Digital Photogrammetric Applications

摘要

Recent years have seen a vast change in measurement technology. Advancement in computer vision, photogrammetry and digital technology has made it possible to analyze and examine the various complex structures such as items, locations or building in virtual 3D models. It is now possible to model a variety of structures in a more efficient way using Digital Close Range Photogrammetric technique [11]. Since, the revolution in digital technology has geared up production of low cost compact cameras and mobile phones with built-in digital cameras. Such products give us the opportunity to take photographs of any object instantly [1]. Now, this low-cost consumer grade camera generation makes it convenient to use it in the digital terrestrial photogrammetric field. As these are easy to handle and carried constantly, allow for capturing moments at any time. The current technological era also provides a wide range of freely accessible photogrammetric software for documenting the actual state of the object of real-world [2]. In these circumstances, one has to analytically study whether low-cost consumer grade cameras and free to use software are able to take place of DSLR and high cost professional photogrammetric software respectively in close range photogrammetric applications [12]. The study aims at evaluating the Photogrammetry based freeware with commercial software to evaluate whether open source softwares are feasible or not for 3D modeling and measurements. The study area chosen for first digital terrestrial photogrammetric application of this project is Buddha Temple located in Dehradun. Buddha Temple is a Tibetan Monestary, also called as Mindrolling Monastery. The Tibetan community of Dehradun builds the Buddha Temple as copy of Tibetan Monastery in 1965. It is located in Dehradun district in the state of Uttarakhand, India. Clement Town which is 7 km from clock tower in main city of Dehradun is the place where Mindrolling Monastery has been located. This is an important familiar sight of Dehradun. Mindrolling Monastery is famous for its astonishing architecture, attractive interiors, and eye-catching surroundings. The monastery complex spans an area of 8,100 m2 and is located at 30.27°N 78.07°E. The temple is 185 feet tall and 100 square feet in width. The Monastery is a dome shaped structure that is surrounded by a 2-acre landscape garden. The surrounding garden area is plain and has no structures that block the view of the temple. This clear view of the temple from all sides makes it easy for the temple to be modelled.