OpenLayers 3入门教程:升级版地图开发利器

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OpenLayers3 API教程是一份针对OpenLayers 3这一强大且现代化的地图库的入门指南。OpenLayers 3是对OpenLayers 2的重大升级,它解决了早期JavaScript开发中的局限性,并引入了现代设计模式。尽管版本2曾被广泛应用,但OL3着重于提供更好的性能、扩展性和兼容性,支持广泛的商业或免费瓦片服务,以及主流的矢量数据格式,包括对不同投影的支持。 教程从基础概念开始,首先介绍了Map(ol.Map),它是OpenLayers3的核心组件,负责地图的显示和配置。Map需要一个目标容器,如网页上的div元素,通过`ol.Map`构造函数创建并设置目标,如下面的示例: ```javascript <div id="map" style="width:100%,height:400px"></div> <script> var map = new ol.Map({target: 'map'}); </script> View(ol.View)在OpenLayers3中扮演着关键角色,控制地图的视图,如中心位置、缩放级别和投影设定。地图的视图是动态调整的,允许用户进行精细的交互操作。 Source(数据源)是地图内容的基础,可以是网络地图服务、瓦片缓存、Bing地图或自定义矢量数据。教程分别讲解了这些不同类型的数据源如何在OpenLayers中应用。 接下来是图层(Layer)的使用,OpenLayers3支持多种图层类型,包括网路地图服务图层、瓦片图层(如TMS或WMS)、矢量图层(如GeoJSON或KML)、矢量影像等。图层的创建和管理是构建复杂地图的关键部分。 教程还涵盖了控件和交互功能,如显示比例尺、选择和绘制地图要素,以及修改这些要素的能力。此外,矢量样式是重要的组成部分,它涉及到图层格式的选择、样式定义以及如何根据需求定制矢量图层的外观。 最后,教程深入探讨了矢量图层的样式设置,包括矢量图层格式的理解和不同样式的应用。这是一份详尽的教程,帮助读者掌握OpenLayers3的使用,无论是初次接触还是希望提升现有技能,都能从中获益良多。
2016-02-11 上传
OpenLayers 3 allows you to create stunning web mapping and WebGIS applications. It uses modern, cutting edge browser technologies. It is written with Closure Library, enabling you to build browser-independent applications without painful debugging ceremonies, which even have some limited fallback options for older browsers. With this guide, you will be introduced to the world of advanced web mapping and WebGIS. First, you will be introduced to the advanced features and functionalities available in OpenLayers 3. Next, you will be taken through the key points of creating custom applications with OpenLayers 3. You will then learn how to create the web mapping application of yours (or your company’s) dream with this open source, expense-free, yet very powerful library. We’ll also show you how to make amazing looking thematic maps and create great effects with canvas manipulation. By the end of this book, you will have a strong command of web mapping and will be well on your way to creating amazing applications using OpenLayers 3. What you will learn Use the advanced functionality of the OpenLayers 3 library effectively Implement the library in your application, shaping it to your needs Manage layers and the layer stack dynamically Create not only stunning but also accurate thematic maps Extend OpenLayers 3 with your own custom classes Develop mobile-friendly web mapping applications Make stunning effects with canvas manipulation, or visualize point clouds with WebGL Integrate third-party applications, and create custom builds that completely satisfy your needs