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GIS实战应用案例100篇(十七)-基于DEM制作三维地图
2022-07-25 06:29:00 【格图洛书】
前言
基于DEM制作三维地图,必须有DEM数据(Tin,Terrain和栅格DEM均可),使用TIN、Terrain速度比较慢,建议使用栅格DEM,分辨率小,处理速度快一点,关于DEM数据的操作可以看13章中关于栅格DEM创建章节内容。制作三维地图,其坐标系建议使用投影坐标系,做三维地图用到的多个数据,坐标系最好一致。
使用DOM制作
DOM是数字正射影像图,可以是卫星影像(卫片)或航空影像(航片),也可以通过无人机拍摄得到。但要求DOM数据和DEM数据的空间XY位置一定要叠加在一起。
使用数据:“chp14\dem.gdb\DOM和DEM”,使用DOM数据和DEM数据制作三维地图的操作如下:
1.打开ArcScene(注意:不是ArcMap);
2.添加数据“chp14\dem.gdb\”中的DOM和DEM的数据;
3.在DOM数据的右键→属性设置界面,如图14-2所示。在“基本高度”选项中,将“在自定义表面上浮动”选项选中。

图14-2 DOM三维制作
4.关闭DEM图层,查看效果如图14-3所示。
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