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Cesium 高度测量工具-源码

上传者： Webgiser_yy | 上传时间： 2024-08-02 16:25:48 | 文件大小： 6.71MB | 文件类型： RAR
Cesium是一个开源的JavaScript库，专门用于创建交互式的3D地球浏览器。在“Cesium 高度测量工具-源码”这个项目中，我们聚焦于一个实用的特性——高度测量。这个工具允许用户通过简单的鼠标操作来测量地表两点之间的海拔高度差。以下是关于这个功能的详细知识点： 1. **Cesium库**：Cesium是一个基于WebGL的3D地球渲染引擎，能够提供实时的全球地形、卫星图像和3D模型展示。它支持跨平台的浏览器运行，广泛应用于地理信息系统（GIS）、虚拟现实（VR）和增强现实（AR）等领域。 2. **交互设计**：描述中的“左键选择开始点，左键选择第二个点，右键结束”是常见的交互模式，符合用户的直觉操作习惯。左键通常用于选择或触发事件，右键则常用于结束或取消操作。 3. **高度测量**：在Cesium中，高度测量涉及到地形数据的读取和计算。Cesium通常使用数字高程模型（DEM）数据来获取地球表面的海拔信息。用户选择的两点之间高度差的计算，需要获取这两点在3D空间中的坐标，然后通过地形数据查询这两个点的海拔，最后进行差值计算。 4. **三维坐标系统**：理解Cesium中的坐标系统至关重要。Cesium主要使用WGS84坐标系，这是一种全球统一的地理坐标系统，用于定位地球上的任何位置。 5. **地形数据处理**：Cesium使用TileMapService imagery provider加载地形数据，这些数据被分割成小块（tiles），按需下载，提高了加载速度和性能。地形数据可能来源于多种格式，如Tiled Elevation Data（TED）或USGS的DEM数据。 6. **源码分析**：在源码中，你可以找到处理鼠标事件、获取地形高度、计算高度差以及更新用户界面的相关代码。这些代码通常会包含事件监听器（如`onMouseDown`、`onMouseMove`和`onMouseUp`）、地形查询函数（如`Cesium.HeightProvider`）和用户界面更新逻辑。 7. **WebGL技术**：实现3D效果离不开WebGL，这是一种在浏览器中渲染3D图形的API。Cesium通过WebGL将地形数据转化为可交互的3D场景。 8. **地图交互**：在Cesium中，用户可以通过鼠标滚轮缩放，平移和旋转视角，这些都是通过鼠标事件处理和视图变换矩阵计算实现的。 9. **自定义插件开发**：Cesium提供了丰富的API和示例，使得开发者可以轻松创建自定义工具和扩展。高度测量工具就是一个很好的例子，开发者可以根据需求扩展其他测量功能，如距离、面积等。 10. **性能优化**：在处理大规模地形数据时，Cesium采用分块加载策略，只加载可视区域内的数据，减少了内存占用和渲染时间，提升了用户体验。 通过对Cesium高度测量工具的源码学习，开发者不仅可以掌握Cesium的基本用法，还能深入理解3D地理信息系统的设计与实现，这对于开发GIS应用或者WebGL项目具有很大的实践价值。

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