Create
There are two ways to create a new point group: you can use
this command or you can use the CGEditor. Previous C&G
users may prefer to use this command but the CGEditor allows the
user the ability to view and edit the point group as it is being
created.
If a coordinate file is not open, you will be prompted to open one
using a file dialog.
Once the coordinate file is open, the point group file dialog can
be used to specify the name of the point group file you wish to
create.
Subgroup description <Enter
when done>: Enter the subgroup description.
Specify points for subgroup
<filename>:
[Block/Code/Desc/Elev/Indiv/liMits/Radius/Vertical_curve] <pick
polyline>:
Use any of the available methods,
including picking a polyline in the drawing, to specify the point
IDs of the points in the subgroup. Remember that, within a
given subgroup, you are defining a specific shape or line and thus
the points need to be entered as an ordered sequence that properly
defines the lot, alignment, etc.
Repeat the steps outlined above until all subgroups and their
points have been entered.
To end the command and create the point group file, press Enter
twice after specifying the last point in the last subgroup.
Using a Polyline to specify a group of points
If you pick a polyline, the coordinate file is searched for points
having northings and eastings that match the x and y coordinates of
the vertices of the polyline. If none of the points in the
coordinate file match the polyline vertices, then no points are
added to the points in the current subgroup. Any points that
match are added to the subgroup points and you are prompted for the
next point in the subgroup. You may continue using any of the
methods of specifying points, including picking other
polylines.
Entering a Curve
First type "I" and enter to enter individual points. As you
are specifying the individual points in the subgroup you can
specify a curve by entering the radius point ID immediately after
entering the ID of the PC. The radius point must be indicated
by preceding its point ID with a plus sign for a clockwise curve or
a minus sign for a counterclockwise curve. The next point ID
you enter is assumed to be the PT.
Vertical Curves
If you are creating a point group to define a road alignment, you
may wish to enter vertical curve information so that both the
horizontal and vertical alignments are defined.
Note: You may find it more
convenient to use the CGEditor to enter vertical curve
information.
To do this type "V" and Enter at the command prompt. You will
see the following prompt:
Vertical Curve 1
[Next/slope-In/slope-Out/Length/pvi-Station/pvi-Elevation]:
For the first vertical curve you must enter five curve
components. Enter these five components by typing the
capitalized letter representing the component that you wish to
specify, then press Enter. You will be prompted to enter the
component specified.
You must enter a value for each of the following five required
fields:
The slope-In
slope-Out
Length of the vertical
curve
pvi-Station
pvi-Elevation.
Entering succeeding vertical
curves
After entering the information for the first vertical curve, enter
<N> for Next. Since the slope in and PVI elevation are
determined by the previous vertical curve information, so you need
only specify three fields for any additional curves:
slope-Out
Length
pvi-Station
Use Previous and Next to enter and/or change the vertical curve
information. You may enter as many as fifty vertical curves.
You can press the F2 key at any time to view the prompt history
screen, then use the scroll bar on the right to view the entire
data entry sequence.
Multiple Subgroups
To place more than one subgroup in a single point group, press
Enter when asked to select another point for the current
subgroup. This ends input for the current subgroup.
At the Subgroup description
<Enter when done>: prompt, enter the name of the next
subgroup and go on to enter a new series of points, including both
horizontal and vertical curve information as needed.
Continue to enter subgroups of points by repeating these steps
until all subgroups have been entered.
When you have entered all the subgroups, press Enter until you get
the Subgroup Description prompt.
Press Enter at the Subgroup Description prompt to end the command
and create the point group file.
Prompts
Subgroup description <Enter
when done>: Enter the subgroup description.
Specify points for subgroup
<filename>:
[Block/Code/Desc/Elev/Indiv/liMits/Radius/Vertical_curve] <pick
polyline>: use one or more of the available methods to
specify points in the current subgroup.
Vertical Curve 1
[Next/slope-In/slope-Out/Length/pvi-Station/pvi-Elevation]:
specify which element of the vertical curve you wish to enter or
type "N" and Enter to begin entering the next vertical curve.
Vertical Curve ##
[Next/slope-Out/Length/pvi-Station]:
after entering the data for the first vertical curve the following
curves are controlled by the initial curve. Thus the prompt
changes.
Pulldown Menu Location:
CG-Survey > Mngmt > Point Groups
Keyboard Command:
cg_create_bpf
Prerequiste:
Coordinate file