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 press ok. The command line
will prompt for the selection of each point 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 your plan, this method can establish 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). Takeoff would computer 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 on the Tablet Calibration Dialog next time when you calibrate the tablet, so you can digitize back to the previous coordinates using Know Reference Points method if you are working on the same drawing, though you might have moved or rotated your drawing on the digitize board option allows the user to specify the drawing scale of the plans be digitized and to assign an assumed northing and easting for a base point. When selected, Drawing Scale and Northing and Easting for Point 1 activate. Press ok. The command line will prompt for a pick of the first point.
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: Contour in Civil Design,
Sections in Civil Design, Digitize in Takeoff
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 .