Abstract
Abstract. The Buddhist fortress Drapham Dzong is located in the Bumthang District in central Bhutan on a mountain ridge at approximately 2930 m altitude. A surveying mission was carried out with the goal to produce a textured 3D model of the site, together with a conventional 2D map and an orthophoto. The remote and exposed location of the site makes traditional surveying, including terrestrial laser-scanning a tedious undertaking. Aerial images of reasonable quality are not available in Bhutan. Satellite images, even of very high resolution (50 cm footprint) do not show sufficient detail for the modelling of the man-made structures. Therefore this project leads itself very well to the use of an appropriate UAV. This paper describes briefly the raw data acquisition by UAV and terrestrial images, and then focuses on the procedures for data processing. The 3D model of the man-made objects is embedded into a large area model of the environment, generated from a GeoEye-1 stereo model. Overall, the project is a typical example of a multi-image concept, making use of imagery of quite different resolutions (satellite, UAV, terrestrial). Given a textured accurate 3D model, 2D maps and orthoimages are nothing but derivatives of this general product. The project also shows how lightweight equipment can be used in remote and not easily accessible areas for surveying and 3D modelling purposes.
Highlights
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XXXIX-B1, 2012 XXII ISPRS Congress, 25 August – 01 September 2012, Melbourne, Australia called Least-Cost-Analysis (Tobler 1993, Fux et al 2009) potential mule track routes between Assam in the south and Tibet in the north can be detected
This contribution describes our work for the 3D model generation of Drapham Dzong and its environment using photogrammetric techniques
We have generated textured computer models derived from high-resolution (0.50 m pixel size) satellite images, very high-resolution UAV aerial images and from terrestrial images
Summary
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XXXIX-B1, 2012 XXII ISPRS Congress, 25 August – 01 September 2012, Melbourne, Australia called Least-Cost-Analysis (Tobler 1993, Fux et al 2009) potential mule track routes between Assam in the south and Tibet in the north can be detected. The goal of our expedition in November 2009 was the generation of the pre requisites to produce a 3D model of the excavation site and its immediate surroundings. For this purpose our main surveying device was a model helicopter (to be precise a quadrocopter) for the acquisition of very large scale aerial images of the site. These images are the basis for photogrammetric measurements and 3D modeling. For the terrestrial image acquisition, such as for the texture of the vertical walls and the documentation of the field work, Nikon D2Xs and D3X, and a Sony DSC-HX1 still video cameras were used
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