地形数据分析

数字地形与高程模型分析函数，包括剖面图、坡度、视线和视域计算

地形数据分析函数可用于计算高程数据的坡度、斜率和坡向。您还可以计算地形上或地表以上某一点的视域，或计算地形上或地表以上两点之间的视线可见度。

函数

`gradientm`	Gradient, slope, and aspect of data grid
`viewshed`	Visible area from point on or above terrain
`los2`	Line-of-sight visibility between two points on or above terrain

Determine and Visualize Visibility Across Terrain
You can use regular data grids of elevation data to answer questions about the mutual visibility of locations on a surface (intervisibility).

Display the viewshed (visible areas) and coverage area for a region of interest using satellite imagery and terrain data.