Compare Points to a Terrain Model

Description

Show a report that compares points to a terrain model.

Access

View / Report / Compare / Points to Terrain Model

Requirements

Controls

The following can be used to control and customise the report:

Control	Description
Title	Type the title to display in the report.
Default	Click the button to display the default title for the report.
Use comparison project	Select the checkbox if the terrain model to compare is in a different project.
	Browse to the project that contains the terrain model to compare.
Terrain Model	Select the terrain model to compare the points to.
Tolerances: Distance Type	Select the checkbox to enable the tolerance box. Select the distance type: Horizontal : Type the horizontal distance tolerance. 3D Distance : Type the three dimensional distance tolerance.
Tolerances: Vertical	Select the checkbox to enable the tolerance box. Type the vertical tolerance. Note: Available when you select Horizontal as the distance type.
	Move the selected item up in the list.
	Move the selected item down in the list.
OK	Show the comparison report.
Cancel	Cancel without running the command.

Select the checkbox to include the columns in the report.

Column	Description
Point Name	Name of the points.
Point Id	Unique Id of the points.
Easting	Easting of the point.
Northing	Northing of the point.
Height	Height of the points.
Horizontal Distance	Horizontal distance to the triangular face.
Vertical Distance	Vertical distance to the triangular face.
3D Offset	A 3 dimensional distance measured perpendicular to the triangular face.
3D Distance	The minimum distance from the point to the terrain model.
Terrain Model Height	Height on the terrain model from where the perpendicular 3D offset to the point is computed. Note: Use in conjunction with the 3D Offset.

Notes

Only selected points will be compared to the terrain model and reported on.
A negative height difference indicates the selected point is below the terrain model.
Clear the Use Comparison Project checkbox to compare selected points with unselected terrain models within the search criteria in the current project.
Select the Use Comparison Project checkbox to compare the selected points with all terrain models within the search criteria in the comparison project.
The shortest Horizontal Distance, Vertical Distance and Offset to the terrain model is reported.
Selected columns will be shown in the defined order.
A horizontal distance is only computed if the points height is within the height extents of the terrain model.
In the report, differences not within the Tolerances display red.
Press Shift + Ctrl then click to move the column to the top of the list.
Press Shift + Ctrl then click to move the column to the bottom of the list.
The average height difference in the reports statistics is the arithmetic mean of the signed values not the absolute values.