This command executes the routine to perform calibration of the digitizer tablet to the drawing. There are two methods of calibration: Known Reference Points, and Drawing Scale with New Reference Points, which are explained in detail below. The Calibrate routine must be used prior to using the Digitize Contours command.
Please refer to Configure, General Settings and Digitizer Puck Layout for selection of the correct puck layout before proceeding.
Known Reference Points uses
two known coordinates for reference points on
the drawing. When this option is selected, the fields for
coordinate info
activate. Enter the known northing and easting values for the reference
points
from the info on
the drawings in
the appropriate fields and pick the Pick button. Pick the points from
the drawing on the tablet. Furthermore, Carlson saves the coordinates
of the two reference
points for future calibrations and displays them on the Tablet Calibration Dialog the next
time
it is accessed, so if you are working in the same drawing, you can use
the Known
Reference Points
method with the saved coordinates to digitize back to your previous
coordinates. For greater
calibration accuracy, choose two points that are farther apart rather
than closer together.
Drawing Scale with New Reference Points is very convenient
when
you don't know the precise coordinates of the entities on your
drawing. The user must specify the drawing scale from the plan.
This
method establishes a coordinate system relative to the
position of the plan on the digitizer board. In addition to the
drawing scale, you are required to enter a random coordinate for
the first reference point, the default coordinate is (1000,1000).
You then pick the Pick button and pick the point on the drawing to
assign the specified coordinate to. The program will compute the
coordinate of
the second reference point that you pick based on the first point.
The coordinates of these two reference points would be saved and will
be display in the Tablet Calibration
Dialog as Known
Reference Points the next time you calibrate the tablet, so you
can
digitize back to the previous coordinates if you
are working on the same drawing, even though you may have moved or
rotated
your drawing on the digitize board.
Tablet
Calibration
Dialog
Specify the Calibration Methods. If you select Drawing Scale method,
enter the drawing scale and the coordinate of the first reference
point. Otherwise enter the exact coordinates of the first and second
reference points.
Pick first
reference point: pick a point
Pick second
reference point: pick another
point
Pulldown Menu Locations: Surface > Digitize Contours
Keyboard Command: digsetup
Prerequisite: Affix a drawing to your digitizer tablet. Have a
digitizer board and a puck connected to your computer, and have Wintab
driver installed. The digitizer has been correctly set up. Select
the puck layout in Configure .
File Name: \lsp\digsetup.lsp