Research And Application Of Automatic Map Theory In Lijiang City 's "Two Rights" Survey

Automated Cartographic Generalization is the inevitable product after the emergence of electronic map, and it is based on the basic geographic information system data to achieve large-scale electronic maps converted from map to small and medium scale. Cartographic Generalization is a historical legacy of the most challenging problems, and it also needs to involve a number of related fields in the computer environment, resulting in Automated Cartographic Generalization has become a digital cartographic research during a heavy and strong research work. With the human experience, knowledge and science and technology to support, Automatic cartographic generalization uses the combination of computer technology and geographic information technology to convert large-scale maps to the small and medium-scale maps directly. This study contributes to the consistency of the different scales of the database, reduce the data redundancy, improve the drawing speed, shorten the cycle of mapping, which has far-reaching significance.This thesis will discuss and analyze the various factors of the Cartographic Generalization and different types of geographic information elements which based on the analysis about domestic and international aspects of cartography comprehensive literature to build Automatic cartographic generalization model by the in-depth analysis of Generalization Operator, Symbol Operator and Modeling feature type in the process of automated cartographic generalization. Taking Lijiang City two rights data as experimental data, experiments were done to verify the model construction of automatic cartographic generalization, and analyze the comprehensive evaluation of test results, In this thesis, the main results are as follows:(1):Constructs the model of automatic cartographic generalization Through the analysis and Research on the basic theory of cartographic generalization and cartographic generalization algorithm. (2):Take the information load, area of load and the drawing load as three evaluation indexes to establish a comprehensive assessment model and evaluate to analyze the result of automated cartographic generalization.(3):Take Lijiang two rights data for example to test the model of automatic cartographic generalization.