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Section 1.7: How To - Hints and Tricks
September 2010
Figure 1.96: This image has been draped onto an elevation model to produce a landscape
1.7.2
Extracting Cross-Sections from Gridded Data
Cross-sections may be extracted from data that is in the form of a grid or mesh.
To create a cross-section or 3D polyline:
1. Display, in a 2D view, the object from which the cross-section will be extracted.
2. Draw a line or polyline (see "Drawing Lines and Closed Polylines" under Creating New
Data Items, on p. 69, for more details), or open a file containing a polyline, which defines
the xy location of the cross-section. Possible files include *.i2s, *.i3s, *.shp, or *.mif.
3. Select the line object in the WorkSpace.
• To increase the resolution of the polyline, see the section "Resampling Lines and
LineSets" under Selecting Data Items, on p. 80.
4. Select Tools→Map Object. See "Mapping Objects" under Tools, on p. 113, for more details.
5. Select the grid or mesh from which the cross-section is to be taken and select the
button.
The value applied to each point on the cross-section is interpolated from the surface of the grid
or mesh. The cross-section will appear in the WorkSpace as a child of the line, and will have
this icon: . The cross-section will have the name of the grid or mesh from which the
cross-section was taken, followed by "XSection".
Figure 1.97: This cross-section was taken from a data item named "DEM"
By default, cross-sections appear in the WorkSpace as 3D line objects.
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