矢量数据¶
- 作者
杰夫麦克纳
- 联系
jmckenna在gatewaygeomatics.com
- 作者
泰勒米切尔
- 联系
tmitchell在osgeo.org
- 最后更新
2022-04-25
本作品在知识共享署名-类似共享的许可下授权。要查看本许可证的副本，请访问：https://creativecommons.org/licenses/by-sa/2.0/ca/
什么是矢量数据？引用的这句话很好地描述了什么是矢量数据：
向量： "An abstraction of the real world where positional data is represented in the form of coordinates. In vector data, the basic units of spatial information are points, lines and polygons. Each of these units is composed simply as a series of one or more coordinate points. For example, a line is a collection of related points, and a polygon is a collection of related lines. Vector images are defined mathematically as a series of points joined by lines. Vector-based drawings are resolution independent. This means that they appear at the maximum resolution of the output device, such as a printer or monitor. Each object is self-contained, with properties such as color, shape, outline, size, and position on the screen."
本文档的其余部分是数据格式指南。本指南的结构旨在展示每个支持MapServer的数据格式的基本原理。每节讨论一种格式，长度从一页到几页不等。这些部分通常以关于格式最重要信息的摘要开始，然后是文件列表、连接方法、ogrinfo用法和mapserver映射文件语法示例。
每个部分都是独立设计的，因此您可能会注意到某些警告和注释是重复的或多余的。这是故意的。根据对MapServer社区的调查，每种格式都是按照流行的大致顺序呈现的。
包括以下格式：