User guide

Using Grids for Spatial
Analysis
The power of Vertical Mapper lies in the ability it gives you to use grids in
complex spatial analysis. This section describes how to:
• use the Grid Calculator
• create grid queries
• use the Point-to-Point Visibility function
• use the Viewshed function
• create slope and aspect grids
• create cross sections
• use the Point, Line, and Region Inspection functions
In this chapter:
 Using Grids for Spatial Analysis. . . . . . . . . . . . . . . . . . . . . . . . . .118
 Using the Grid Calculator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .118
 Understanding Grid Queries . . . . . . . . . . . . . . . . . . . . . . . . . . . . .122
 Understanding Slope and Aspect . . . . . . . . . . . . . . . . . . . . . . . . .127
 Creating a Cross Section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .129
 The Point Inspection Function . . . . . . . . . . . . . . . . . . . . . . . . . . .130
 The Line Inspection Function . . . . . . . . . . . . . . . . . . . . . . . . . . . .130
 The Region Inspection Function. . . . . . . . . . . . . . . . . . . . . . . . . .132
 The Point-to-Point Visibility Function . . . . . . . . . . . . . . . . . . . . .133
 The Viewshed Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .136
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