The Drawing Units dialog box controls coordinate and angle display formats and determines precision.
Under Length, you specify the current unit of measurement and the precision for the current units.
● Type: This field sets the current format for units of measure. The values include Architectural, Decimal, Engineering, Fractional, and Scientific. The Engineering and Architectural formats produce feet-and-inches displays and assume that each drawing unit represents one inch. The other formats can represent any real-world unit.
● Precision: This field sets the number of decimal places for the current units display.
Under Angle you specify the current angle format and the precision for the current angle display.
● Type: This field sets the current angle format.
● Precision: This field sets the precision for the current angle display.
Carlson Survey uses the following conventions for the various angle measures: decimal degrees appear as decimal numbers, grads appear with a lowercase g suffix, and radians appear with a lowercase r suffix. The degrees/minutes/seconds format uses d for degrees, ' for minutes, and " for seconds, for example:
123d45'56.7"
Surveyor's units show angles as bearings, using N or S for north or south, degrees/minutes/seconds for how far east or west the angle is from direct north or south, and E or W for east or west, for example:
N 45d0'0" E
The angle is always less than 90 degrees and is displayed in the degrees/minutes/seconds format. If the angle is precisely north, south, east, or west, only the single letter representing the compass point is displayed.
● Clockwise: This option calculates positive angles in the clockwise direction. The default direction for positive angles is counterclockwise.
When the program prompts for an angle, you can point in the desired direction or enter an angle regardless of the setting specified for Clockwise.
Under Drawing Units for Carlson Survey blocks, you can control the unit of measurement used for block insertions. A block created in units that differ from the units specified in this option is scaled and inserted in the specified units. Select Unitless to insert the block as is and not scale the block to match the specified units. Source content units and Target drawing units settings in the User Preferences tab of the Options dialog box under the Settings menu are used when Insert Units are not defined.
Sample Output displays an example of the current settings for units and angles.
Direction displays the Direction Control dialog box described below.
A The Base Angle determines where 0 degrees is located when the program calculates angles. The base angle sets the direction of the base angle. These options affect the entry of angles, object rotation angles, the display format, and the entry of polar, cylindrical, and spherical coordinates. Choose East, North, West, or South, or choose Other to indicate an alternative direction. The default direction for the zero angle is East. In Carlson Survey, the base angle is relative to the orientation of the user coordinate system.
● East: Sets the base angle to east (default is zero degrees).