Technical data

Chapter 2 Getting Started with AutoCAD Land Development Desktop
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Redrawing and Regenerating
When the drawing is cluttered with blips or temporary markers, you
can clean up the current viewport quickly by using the REDRAW
command. It refreshes the screen and redraws objects without
updating the drawing database. If you use more than one viewport,
you can use the REDRAWALL command.
You can also update the drawing screen by regenerating the drawing.
The REGEN command reads all the data in the database and calculates
the screen coordinates of each object on the screen. Because
regenerating a complex drawing is time consuming, you usually
redraw.
NOTE To reduce regeneration time, you can freeze layers to keep data from
being regenerated.
For more information use to look up “Refreshing the Screen
Display” in the online Help.
Organizing Drawings with Layers
All drawing objects in AutoCAD Land Development Desktop are
assigned a layer. Drawing layers are like sheets of clear acetate that are
positioned one over the other. Layers help you organize drawing data,
control the drawing display, and what is plotted or printed. You can
make objects on a layer invisible and prevent them from being
plotted, by freezing the layer or turning if off. You can lock a layer to
prevent it from being edited.
Key Concepts
■
You can group and organize drawing layers by function and other
categories. For example, put minor contours on one layer and
major contours on another.
■
Each drawing can have its own layer structure, or hierarchy. You
can also set up a layer configuration and then save it as a drawing
template to enforce linetype, lineweight, color, and other standards
when you create new drawings.
■
Assign layers a color, linetype, and/or lineweight to distinguish
them from other layers. Layer 0 is always present and all other
layers are layers that you create.