All Cadcorp SIS API Methods

CreateViewshed Method

Description

Create a Viewshed on a grid in a named list.

Syntax

Public Function CreateViewshed( _
   ByVal list As String, _
   ByVal x As Double, _
   ByVal y As Double, _
   ByVal z As Double, _
   ByVal r As Double, _
   ByVal bQZone As Long _
) As Integer

Parameters

list

The named list containing a grid item.

 

x

The x coordinate of the eye position from which the grid is viewed to create the viewshed.

y

The y coordinate of the eye position from which the grid is viewed to create the viewshed.

 

z

The z coordinate of the eye position from which the grid is viewed to create the viewshed.

 

r

The maximum distance from the eye position for which the viewshed will be calculated.

 

bQZone

0  create the viewshed as a grid item
1  create the viewshed as a QZone item

Remarks

If the list contains more than one grid only the first will be used. The z value is absolute, i.e. not a relative distance. The resolution of the resulting QZone depends on the size of the grid cells.

Available: GEO OD SISpy

Group:

• Drawing Methods
• 3D Methods

Example

            sis.CreateViewshed("MyGrid", xpos, ypos, zpos+10, 4000, 1)

Creates a QZone to represent the viewshed of the grid in the list MyGrid viewed from a position 10m above x, y, z with a maximum view radius of 4000m.