2011

Table Of Contents
NOTE These options affect attached drawings only. For information about
changing the coordinate system for geospatial data, see
Changing Coordinate
Systems
(page 311).
Adjust Sizes And Scales - For Changes In Units
Specify whether the units used in the coordinate system of an attached
drawing are scaled to the units used in the coordinate system of the current
drawing.
For example, if an attached drawing uses meters and the current drawing
uses U.S. Survey Feet, you can scale text and blocks so that their size or scale
measures in feet rather than meters.
If you do not set the For Changes In Units option, AutoCAD Map 3D doesn't
size or scale text and block objects. In that case, a block that is five meters
long in an attached drawing will be five feet long when you bring it into
the current drawing.
Do not change this setting after you bring objects into the current drawing,
or you may introduce unintended changes to text and blocks when you
save them back to their source drawings.
Adjust Sizes And Scales - For Map Distortion
Adjust the size and scale of text and blocks to correct for map distortion
introduced when you represent a spherical object (earth) in a Cartesian
coordinate system.
For example, two objects, located at the northern and southern extremes
of a map, of equal length in coordinate system X will remain the same
length when transformed to coordinate system Y.
If you don't select this option, the two objects will be scaled to different
lengths in coordinate system Y according to the relative map distortion (or
grid scale factor).
This option is not available if For Changes In Units under Adjust Sizes And
Scales is not selected.
Adjust Rotations - For Map Distortion
Adjust the angle of text and blocks to correct for map distortion due to the
convergence angle (the deviation of the Y axis of a Cartesian coordinate
system from true north).
Adjust Rotations - For Zero-Rotation Objects
Specify that text and blocks that have a rotation value of zero in the source
drawing are adjusted to correct distortion due to the convergence angle
(the deviation of the Y axis of a Cartesian coordinate system from true
north).
If you set this option, AutoCAD Map 3D calculates the convergence angle
for text and blocks with a zero rotation value. If you don't set this option,
1910 | Chapter 37 Setting Map Options Dialog Boxes