In this exercise, you will define a stratum from surfaces EG and FG, and then define a site enclosing the area in which volumes will be calculated.
On the Terrain menu, click Select Current Stratum to display the Define Stratum dialog box.
Enter Stratum1 for the Name and EG and FG Surfaces for the Description.
Click Select for Surface 1 to display the Select Surface dialog box, select EG, and then click OK to return to the Define Stratum dialog box.
Click Select for Surface 2 to display the Select Surface dialog box, select FG, and then click OK to return to the Define Stratum dialog box.
Verify that Surface 1 is eg and Surface 2 is fg, and then click OK to continue.
Use the following steps to change the volume site settings.
On the Terrain menu, click Site Definition
Site Settings to display the Volume Site Settings dialog box.In the Volume Labeling section enter m3 for the Suffix, and then click OK.
Use the following steps to define the site with a 2 m by 2 m grid rotated 20 degrees.
On the Terrain menu, click Site Definition
Define Site.Enter 20 degrees for the Rotation angle.
Enter .P (dot P) to use the point filter, and then enter 1 for the Site Base Point.
Filters are available for your use when working with AutoCAD Land Desktop commands. Use the .P point filter to specify an existing point number, use the .G graphical filter to select objects in the drawing, or use the .N northing filter to specify northing and easting coordinates.
Enter 2 m for the Grid M size, and then press ENTER to accept the default, 2 m, for the Grid N size.
Enter .P (dot P) again to disable the use of the point filter, and then use an Endpoint OSNAP to select the upper right corner of the site definition polyline.
Press ENTER to accept the default, No, to changing the size or rotation of the grid, and then enter No to erasing the old site outline.
Enter Site1 for the Site name.
With a defined stratum and grid you have a relationship between two surfaces from which, by various methods, you can derive volumes.