GIS中宗地面积的平差模型与方案探讨  

Adjustment Models and Methods of Parcel Area Processing in GIS

作　　者：童小华[1] 刘大杰[2] 龚健雅[1] 

机构地区：[1]武汉大学测绘遥感信息工程国家重点实验室 [2]同济大学测量与国土信息工程系,上海市四平路1239号200092

出　　处：《武汉大学学报（信息科学版）》2003年第2期182-187,共6页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金资助项目 ( 40 1710 78);湖北省博士后基金资助项目

摘　　要：首先给出了面积平差的基本原理和数学模型 ,并提出了面积平差处理的 3种方案 ,并对这In this paper,area processing for cadastral parcel in GIS is thoroughly studied.The principles and models of area adjustment are presented.Then three themes of area processing are proposed:the first is that the area of a parcel is treated as a fixed value and the digitized coordinates are regarded as observations;the second is that both area and coordinates are treated observations,which are two different kinds of observations.It is important to determine the weights between these two kinds of observations.Therefore,the variance component estimation with parameters based on the condition adjustment is then used to solve this problem;the third is that the scale error in area adjustment is considered.The reason is that in the parcel area digitization,the systematic error has great effect on the parcel area due to errors in transformation between different coordinates systems and image correction.And the variance component estimation with parameters based on the condition adjustment is then presented,the hypothesis tests are further conducted to determine the obviousness of area scale error.In the end,case studies of the three themes are given,the results are discussed and the conclusions are reached that it is necessary to select a pertinent model to process parcel area to improve the accuracy parcel digitization in GIS.

关 键 词：GIS 宗地面积 平差模型 方差分量估计 尺度参数 

分 类 号：P208[天文地球—地图制图学与地理信息工程] P207.2[天文地球—测绘科学与技术]