Autodesk AUTOCAD 2006 Command Reference Manual page 654

A landscape object is an extended-entity object with a bitmap image mapped
onto it. You can manipulate the object directly in the drawing as well as in
the Landscape New dialog box. The geometry of the object depends on whether
you choose one or two faces for it and whether it is view aligned. You make
these choices according to your rendering requirements.
Each landscape object has grips at the base, top, and each corner. Use the base
grip to move the object, the top grips to adjust its height, and the bottom
corner grips to scale it and, if it's not view aligned, rotate it. You can use all
standard grip editing modes for stretching, scaling, and rotating landscape
objects.
With two related commands, LSEDIT and LSLIB, you can modify landscape
objects and maintain landscape object libraries.
In order to view changes made with the LSNEW, LSEDIT, and LSIB commands,
the view must be a non-plan view (use VPOINT or DDVPOINT), and you must
run the RENDER command. You can also use SHADEMODE, instead of
RENDER, but you must turn on all the render options in the "3D Graphics
System Configuration Dialog Box" on page 802, Render Options area.
Landscape Objects
Lists landscape objects available in the current landscape library. Select the
one you want to insert in the drawing.
Geometry
Specifies the geometry and alignment of the landscape object. The geometry
of an object depends on its number of faces and alignment. A single-face
view-aligned object appears in the drawing as a triangle. You cannot use grips
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