移动地理信息系统数据模型与3S集成关键技术

在掌上电脑硬件平台下，对地理信息系统（GIS）数据模型进行了研究．通过比较与分析，提出了一种面向对象的移动GIS数据模型，设计和实现了一个移动地理信息系统，探讨了系统设计和实现的关键技术，包括低内存环境下的大数据量组织与管理，与全球定位系统（GPS）、遥感等的集成技术，构建了一个可支持数据移动采集、定位与导航、多源数据融合等应用的集成应用服务环境．在上海某区进行试验，结果表明所提出的移动GIS数据模型和构建的集成服务环境具有较好的高效性与实用性．

Mobile Geographic Information System Data Model and Key Technology of Geographic Information System,Global Positioning System and Remote Sensing Integration Based on Personal Digital Assistant

A new method integrated mobile geographic information system(GIS),global(positioning) system(GPS) and remote sensing(RS) is studied on the basis of personal digital assistant(PDA).Key technologies are presented in the method,including organization and management of large quantity of GIS data in an environment with low memory,the processing method of GPS data in GIS,and representation of RS data in mobile GIS.A new mobile object-oriented GIS data model which is Characterized by its high drawing efficiency,fast searching and displaying speed and low storage data is further proposed for mobile GIS. A "3S" integration application service environment which can support data mobile gathering,location and navigation and multi-source data fusion application is therefore developed and implemented on the basis of PDA.A field test is carried out with this service environment in Shanghai,and the results show that the proposed model and methods are feasible for mobile GIS.