In this paper,factors lead to changes and what changes should be considered are firstly discussed.Then changes to be represented by set theory is given.Twelve basic change types are described in deta
In this paper,the entity_relation data model for integrating spatio_temporal data is designed.In the design,spatio_temporal data can be effectively stored and spatiao_temporal analysis can be easily r
The essential of feature matching technology lies in how to measure the similarity of spatial entities.Among all the possible similarity measures,the shape similarity measure is one of the most import
This paper discusses the urban land grading system based on the self_developed GIS software.The system establishes the system template,the relevant data structure and the empirical formulas of the aff
Based on the developing tendency of present Chinas basic GIS,this paper discusses the designing idea for scales of 1∶10 000,1∶50 000, 1∶250 000 and 1∶1 000 000 pyramid_like multi_layer and mult
Urban geo_environment mainly concerns those regards in and around a city,such as the movement of earth crust and earth surface,conditions of hydrology,geology,geography and meteorology.The relevant st