Study On Approximate Adjustment Method of Enclosed Lead
This paper is to explore technical schema for data quality control in the process of digital cadastral data collection. Proprietary investigation and data quality control are discussed on data collecting procedures of digital cadastre. One adjustment method is proposed to process rectangular conditions, line conditions and distance conditions in boundary point survey.
There have been 4 phases of precise leveling(1971-1976,1976-1980,1980-1986 and 1986-1996) carried out in the Guanzhong area of Shanxi Province so far. We process the 4 phases of data using segmental linear rate dynamic adjustment method,and study the evolution characteristics of vertical crust deformation field in the Guanzhong area from dynamic viewpoint.
Based on a brief analysis of the difficiencies of the original simplified adjustment method, measurement error theory was used to derivate the approximate adjustment formula of a new simplified adjustment method, which was then used in real case adjustment calculation and precision evaluation.