Study On Methods Of Special Objects Extraction And Height Calculation From High Tension Corridor

This dissertation is funded partially by the High Technology Research and Development Program (2003AA134040) and the Central China Grid Company Limited.The rapid development of our national economy brings up higher requirement to the safe operation of infrastructures such as power transmission network. For this reason, it is an urgent demand for electric power enterprise to make use of remote sensing technology for power line inspection. In the mean time, one of emphases is placed on the development of high-resolution aerial optical camera with its vigorously accelerating production of remote sensing technology during the Tenth Five-Year Plan period.In powe line surverying, one of the important tasks is to accurately measure the distance between the transmission lines and surrounding objects. Recently, airborne laser scanning system (ALS) is applied in power line corridor monitoring. However, the cost of laser scanning system is very high and some slim objects are probably missed or are not measured. It is a challenge recognizing the land object and accurately measure its height from high resolution aerial optical images. The goal of study in this paper is to develop a multi-angular airborne imaging system and appropriate software to obtain the distance between the transmission lines and surrounding objects using digital photogrammetry, accurate POS system, large-scale aerial images and image processing technology for the safety of the power line transmission.The creative works are on the study of special objects extraction and height calculation from high tension corridor. The main innovation results of this dissertation are listed as follows:...