基于Pocket PC全要素1∶5万GIS数据采集系统

Pocket PC-based Full Feature Data Collection System for 1∶50000 GIS Database Updating

由于国民经济的迅速发展,对国家的基础地理信息数据的时效性需求在不断发生变化。为了保持和维护国家基础地理信息数据库的时效性,需要对其进行及时更新和维护。从我国1∶5万基础地理信息数据库的更新和维护的要求出发,提出了基于Pocket PC的全要素GIS数据采集系统的设计方案,并对全要素地理数据采集中的关键问题进行了讨论。重点提出了基于嵌套链表数据结构的全要素地物属性编码表的管理以及基于面向对象思想的地物属性二次抽象实现技术;对1∶5万基础地理信息中GPS空间数据采集进行了分析,提出了多点平滑的GPS数据处理技术;对外业数据记录进行了分析和讨论;对解决上述问题所开发的并已经应用于1∶5万基础地理信息中GPS空间数据采集系统软件的开发基本思路进行了描述。

With the rapid development of the economy in China, constant changes have taken place in demanding for up-to-date fundamental geographical information, which require for updating and complementing the fundamental geographical information database. In order to meet the requirement for national 1 ： 50 000 fundamental geographical information database updating, this paper focuses on the technical scheme of the field GIS data collection system based on embedded Pocket PC. Key points are discussed which are full feature terrain object＇ s attributes code management, spatial data collection, data collection design principle of GIS data collection software. One type of data structure based on nesting link table, from which the two-time-object-abstracting is infered, is given in details. A smoothing method with multi-GPS-point is proposed. In addition, analyses of field data recording and embedded multi-thread software designing are shown.