Study On The Methods Of Land Use Map Generalization Based On ArcGIS

Land use map is a thematic map which shows the land use types, land area and land use structure. It can provide direct information for the leaders' decision-making. However, different levels of decision-making managers need different scales of land use map, so it's necessary to perform map generalization on large scale land use map.Nowadays, every place of our country is conducting updated land survey. It involves a very important task that is completing various scales of land use map based on the land data collection. The traditional methods on land use map generalization in our country cost a long time and their products have a low precision level which couldn't embody the synchronization of land use map. Therefore, it is very urgent to solve the problem through much quicker and more efficient technical methodsThis study was carried out under those requests and studied how to fulfill the land use map generalization under the ArcGIS environment. The main contents of this thesis were as follows:(1) Started by the generalization function of ArcGIS, the study analyzed the ArcGIS's advantages and disadvantages on map generalization, then put forward the whole route of land use map generalization based on ArcGIS.(2) Based on the construction of land use database, this thesis designed the structures of point, polyline and polygon data of land use, established the map generalization rules of land use on the knowledge, then elaborated the realization of key techniques.(3) In the last part of the thesis, we validated the technical methods with the combination of a case study. Then we evaluated the feasibility of the methods through two indicators, namely the time cost and land areas' changes after generalization. The result showed that its effects on map generalization both from 1:2000 to 1:10000 and from 1:10000 to 1:50000 were good, not only from the aspect of time cost, but also from the rationality of land areas' changes.