2.0

Table Of Contents

Chapter 1 Using the Grading Commands

for the temporary DTM. This DTM in memory is discarded upon completion

of the command.

NOTE

You can also use the Create Surface command to create a DTM, then create

contours from the DTM.

To create contours from a grading object

1 From the Grading menu, choose Slope Grading ä Create Contours. At the

command line you are prompted to select a grading object.

2 Select the grading object. The Create Contours from Grading Object dialog box

is displayed.

3 Under Elevation Range, define the range of the surfaces elevation for which

you want to create contours by entering values in the From and To boxes. The

low and high elevations of the surface are displayed as defaults.

TIP

If you change the Elevation Range, then you can return to the default range

by clicking the Reset Elevations button.

4 To exaggerate the elevational changes of the contours when you look at them

in 3D, enter a value other than one (1) in the Vertical Scale box.

NOTE

If you exaggerate the vertical scale, the contours are drawn at an

exaggerated elevation and are therefore incorrect when labeling or as a

basis for future TIN creation.

5 Under Intervals, select one of the following options:

Both Minor and Major

Minor Only

Major Only

6 Define the contour intervals by entering values in the Minor Interval and Major

Interval boxes. For example, if you enter a minor interval of 2, and your