6 Xiying Road

Fengcheng, China

6 Xiying Road

Fengcheng, China
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Kong Y.,Xi'an University of Architecture and Technology | Kong Y.,Xian Research Institute of Survey and Mapping | Fang L.,Xi'an University of Architecture and Technology | Jiang Y.,6 Xiying Road | Zhang Y.,Xian Research Institute of Survey and Mapping
Wuhan Daxue Xuebao (Xinxi Kexue Ban)/Geomatics and Information Science of Wuhan University | Year: 2012

There are some fast and effective methods related to image processing technique. But they are unsatisfactory in resisting the noise and in reducing the redundant information. For this situation, a new method of extracting terrain feature lines is proposed by the mathematical morphology. Considering the characteristics of the ridges and valleys, two kinds of operators are designed by basic morphological operation. Then the new method is built on the operators with iterative forms. The experimental results show that the ridge-lines and valley-lines extracted by the method fit the real terrain. And it can resist some small-scale noise.


Ren K.,Zhengzhou University | Song X.,Xian Research Institute of Surveying and Mapping | Jia X.,Xian Research Institute of Surveying and Mapping | Ouyang G.,6 Xiying Road
Wuhan Daxue Xuebao (Xinxi Kexue Ban)/Geomatics and Information Science of Wuhan University | Year: 2012

According to the characters of regional navigation satellite system, there are some problems that GEO and IGSO satellite may maneuver and less than 4 available navigation satellites could be used during its early building stage. We propose a type of navigation strategy which adopt Receiver Autonomous Integrity Monitoring faults detection, exclusion method and three stars positioning approach and ill conditioning of normal equation resolution to overcome these problems. Then the validation and continuity of navigation satellite system in ordinary application fields can be improved. By handling the actual data, the feasibility of these approaches is verified.


Geng X.,6 Xiying Road | Xu S.,6 Xiying Road | Gong Z.,Zhengzhou University | Yuan J.,6 Xiying Road
Wuhan Daxue Xuebao (Xinxi Kexue Ban)/Geomatics and Information Science of Wuhan University | Year: 2011

Aerial triangulation is the core process in aerial photogrammetry which determines the accuracy of 4D products. The data processing procedure and accuracy analysis method of aerial triangulation for ADS40 linear array images are different from that of frame images. The basic principle of aerial triangulation for three line scanner images is introduced firstly. The automatic tie point matching, blunder detection, variance component estimation, datum transformation and the weight of GPS/IMU observations in the combined adjustment are discussed. The accuracy analysis method of aerial triangulation for ADS40 linear array images is concluded. Experimental results show that using the data processing method concluded in this paper we acquired a satisfactory result.


Xu X.,6 Xiying Road | Zhang M.,6 Xiying Road | Zhu X.,6 Xiying Road
Journal of Geomatics | Year: 2011

Taking the quas-igeoid model establishment of some certain borderland as an example, we study the Stokes' removing and renewing method and the frame restrict spherical harmonic expanding model. The compution of the area with sparse and unqualified data analyzed. We proved that the realized restrict spherical harmonic expanding model is better than the general Stokes' removing and renewing method in precision.

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