地图数据转换编辑与拓扑建立111

地图数据转换、编辑与拓扑建立

摘 要：随着地理信息行业的飞速发展，人们对GIS数据的需求越来越大，而现有的测绘成果多以CAD数据为主,为了满足人们日益增长的需求，同时也为了避免对原有测绘成果造成浪费，对地图数据进行转换、编辑与拓扑建立步入了GIS技术发展的核心问题之列。本文从典型的DWG数据和Geodatabase数据的研究入手，从数据组织和拓扑关系两个方面了解数据模型特征，通过实验剖析传统数据转换方法存在的问题，提出了利用FME技术解决数据转换问题的思路。本文以“‘7918’国家高速公路网”数据为例，在FME Workbench平台上实现了DWG数据向Geodatabase数据的转换，并且在ArcGIS平台上成功建立拓扑，形成了一套行之有效的数据转换方法。

关键词：DWG; GeoDatabase; 数据转换; FME Workbench; 拓扑关系

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The Transition, Edit and Topology of Map data

Abstract: With the development of the geographic information industry, the demand of GIS data gets bigger and bigger while the existing surveying and mapping results are dominated by CAD data. In order to meet people’s growing needs and avoid wasting established results, the transition, edit and topology of map data becomes the core issue. This paper starts with the study of the typical DWG data and Geodatabase data, shows the features of data model from data organization and topology, and proposes to use FME technology to solve the problem of data conversion through the experiment of analyzing the causes of the traditional data conversion. Based on the data of “7918 national highway system”, this paper realizes the transition from DWG data to Geodatabase data, builds topology on ArcGIS platform, and forms an effective way of data conversion.

Keywords: DWG; GeoDatabase; data conversion; FME Workbench; Topology

Forest is the largest terrestrial ecosystem on the earth, it is a necessary basis for human existence and development. It is not only to provide people with rich timber and forest by-products, but also play an important role in climate regulation, water conservation and protect environment. Therefore, developing forest resources investigation, getting the status and changes of forest resources, for improving the level of decision-making to promote the forestry development, forestry and social economy and even the global environment sustainable development has the extremely vital significance

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目 录

1 前言 ................................................................................................................................... 1

1.1选题背景 ................................................................................................................. 1 1.2国内外研究及应用现状 ......................................................................................... 1 1.3研究目的与意义 ..................................................................................................... 3 1.4研究方法与技术路线 ............................................................................................. 3 2 DWG格式和Geodatabase格式数据模型的特点 ........................................................... 4

2.1数据组织 ................................................................................................................. 4

2.1.1DWG数据组织 ............................................................................................. 4 2.1.2Geodatabase数据组织 .................................................................................. 5 2.2拓扑（Topology） .................................................................................................. 6

2.2.1AutoCAD中的拓扑 ...................................................................................... 7 2.2.2ArcGIS中的拓扑 .......................................................................................... 7

3 DWG格式数据向Geodatabase数据转换方法探讨 ..................................................... 11

3.1转换前的DWG格式数据处理 ............................................................................ 11

3.1.1数据分类组织 ............................................................................................ 11 3.1.2CAD要素与GIS要素相对应 ................................................................... 13 3.2转换方法 ............................................................................................................... 14

3.2.1利用ArcToolbox实现数据转换 ............................................................... 14

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3.2.2基于FME的DWG格式数据向GIS数据转换方法 .............................. 15 3.3拓扑建立 ............................................................................................................... 20 4 结论与展望 ..................................................................................................................... 24 参考文献 ............................................................................................................................. 25 指导教师简介 ..................................................................................................................... 26 致谢 ..................................................................................................................................... 27

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