COGO Point and Line Commands

This topic describes the commands you can use when creating COGO collections and computing parcels.

The table below includes all of the Create COGO command names, along with each command's alpha code, numeric code (press the Asterisk key ("*") once and type the numeric code on your numeric keypad), and required values.

Note that in addition to the required values listed for each command in the table below, all commands (except for the Start Point SP command) accept several optional values as well.

If the Positions have elevations (3D) box on the Create COGO: Options tab is checked, you can also include, immediately following the required values, an Elevation value. The first Elevation value you enter in a command line persists for all subsequent commands until you change it. If the Positions have elevations (3D) box is unchecked and you manually type elevation values in your script commands, they will be ignored.
If the Automatically create points at vertices box on the Create COGO: Options tab is checked, you can also include, immediately following the required values (and Elevation value, if included), a Point ID value. The Point ID value you enter will override the automatically generated ID.

Create COGO command name	Alpha code (See Note 1 below.)	Numeric code (See Note 2 below.)	Required values (See Note 3 below.)	Supplies relative orientation change?
Start commands
Start Coordinate	SC	*00	Start coordinate	No
Start Point	SP	*01	Start point	No
Start by Offset	SO	*02	Start point Horizontal offset (See Note 4 below.)	Yes
End commands (See Note 4 below.)
End Coordinate	EC		End coordinate	Yes
End Point	EP		End point	Yes
Add Point commands
Point by 2 Distances from Points (right)	DDR	*51	Point 1 Distance 1 Point 2 Distance 2	No
Point by 2 Distances from Points (left)	DDL	*52	Point 1 Distance 1 Point 2 Distance 2	No
Point by 2 Azimuths from Points	BB	*53	Point 1 Azimuth 1 Point 2 Azimuth 2	No
Point by Azimuth and Distance from Point	BD	*54	Start point Azimuth Length	No
Point at Offset (DxDy) from Point	DO	*55	Start point Easting distance Northing distance	No
Point on Line Ext. (by Points)	POL	*56	Start point End point Length	No
Point by Right Angle (by Points)	PO	*57	Start point End point Length	No
Point by Angle (by Points)	PA	*58	Start point End point Deflection angle Length	No
Point by Coordinates	P	*60	Point coordinate	No
Point by 2 Distances from Coordinates (Right)	CDDR	*61	Coordinate 1 Distance 1 Coordinate 2 Distance 2	No
Point by 2 Distances from Coordinates (Left)	CDDL	*62	Coordinate 1 Distance 1 Coordinate 2 Distance 2	No
Point by 2 Azimuths from Coordinates	CBB	*63	Coordinate 1 Azimuth 1 Coordinate 2 Azimuth 2	No
Point by Azimuth and Distance from Coordinates	CBD	*64	Start coordinate Azimuth Length	No
Point at Offset (DxDy) from Coordinates	CDO	*65	Start coordinate Easting distance Northing distance	No
Point on Line Ext. (by Coordinates)	CPOL	*66	Start coordinate End coordinate Length	No
Point by Right Angle (by Coordinates)	CPO	*67	Start coordinate End coordinate Length	No
Point by Angle (by Coordinates)	CPA	*68	Start coordinate End coordinate Deflection angle Length	No
Add Line commands
Line by Bearing/Azimuth	LB	*10	Bearing/Azimuth Length	No
Line by Interior angle	LI	*13	Interior angle Length	Yes
Line by Left 90 degree angle	LL	*14	Length	Yes
Line by Points	LP	*15	From point (first of two survey points used to create a line) To point (second of two survey points used to create a line)	No
Line by Right 90 degree angle	LR	*16	Length	Yes
Line eXtend (tangential)	LX	*17	Length	Yes
Arc by Bearing/Azimuth of Chord	ABC	*30	Bearing/Azimuth of chord Radius (See Note 6 below.) Arc length/Chord length/Delta angle (See Note 7 below.) Example...	No
Arc by Bearing/Azimuth of Radial	ABR	*31	Bearing/Azimuth of radial Radius (See Note 6 below.) Arc length/Chord length/Delta angle (See Note 7 below.) Example...	No
Arc by Bearing/Azimuth of Tangent	ABT	*32	Bearing/Azimuth of tangent Radius (See Note 6 below.) Arc length/Chord length/Delta angle (See Note 7 below.) Example...	No
Arc by Coordinates (PCPIPT method)	AC	*20	Intersection (PI) coordinate Tangent(PT) coordinate Example...	No
Arc by Deflection angle of Chord	ADC	*33	Deflection of chord Radius (See Note 6 below.) Arc length/Chord length/Delta angle (See Note 7 below.) Example...	Yes
Arc by Deflection angle of Radial	ADR	*34	Deflection of radial Radius (See Note 6 below.) Arc length/Chord length/Delta angle (See Note 7 below.) Example...	Yes
Arc by Deflection angle of Tangent	ADT	*35	Deflection of tangent Radius (See Note 6 below.) Arc length/Chord length/Delta angle (See Note 7 below.) Example...	Yes
Arc by Interior angle of Chord	AIC	*36	Interior of chord Radius (See Note 6 below.) Arc length/Chord length/Delta angle (See Note 7 below.) Example...	Yes
Arc by Interior angle of Radial	AIR	*37	Interior of radial Radius (See Note 6 below.) Arc length/Chord length/Delta angle (See Note 7 below.) Example...	Yes
Arc by Interior angle of Tangent	AIT	*38	Interior of tangent Radius (See Note 6 below.) Arc length/Chord length/Delta angle (See Note 7 below.) Example...	Yes
Arc Tangential	AT	*21	Radius (See Note 6 below.) Arc length/Chord length/Delta angle (See Note 7 below.) Example...	Yes
Arc eXtend	AX	*22	Arc length/Chord length/Delta angle Example...	No
Sideshot Mode commands
Radial Sideshot	RS	*41	No value required. Use to specify start of one or more radial (single-segment) sideshot commands. Follow with add-line or add-arc commands as necessary to define each radial sideshot extending from the current point. End with End Sideshot - ES command.	No

Note 1: Alpha codes are not case-sensitive.

Note 2: To enter a numeric code using a numeric keypad, press the Asterisk key ("*") once and then type the two-digit code. (The Numeric keypad mode check box must be checked on the COGO: Options tab.)

Note 3: Values must be entered in the sequence shown, separated by commas or (or other cultural-based delimiters). To insert a comma using a numeric keypad, type "+".

Note 4: End commands are used to end a line at a measured point or coordinate that is fixed in the adjustment computation. These commands are typically used when performing a Grant Boundary adjustment on a parcel that has already been computed.

Note 5: When you enter a Start by Offset - SO command, the Start point you select (the point from which the new point will be offset) must have an orientation. This allows you to specify a Horizontal offset value for the new point at a right angle to either the right (positive value) or left (negative value) of the Start point based on its direction of travel. This means that the Start point must be in the same COGO collection and cannot be, for example, a Start by Coordinate - SC point, which has no orientation.

Note 6: The polarity of radius values specify the direction of the curvature. A positive radius causes the arc to curve in a clockwise direction; a negative radius causes the arc to curve in a counter-clockwise direction.

Note 7: The length of a chord cannot exceed twice the length of the radius.