Perpendicular distance

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T.M. Moretz
Posts: 79
Joined: Fri Nov 08, 2002 1:31 pm
Location: North Carolina, USA

Perpendicular distance

Post by T.M. Moretz » Mon Oct 20, 2003 5:04 pm

I've been checking this graphically for so long that I've forgotten how to calculate it with COGO without creating a new point, meaning that I want to know the perp. distance from point 1 to the line created by points 2 and 3.

Glen Cameron
Posts: 1395
Joined: Fri Nov 08, 2002 12:18 pm
Location: Corbeil, Ontario, Canada

Perpendicular Distance in COGO

Post by Glen Cameron » Mon Oct 20, 2003 6:26 pm

In COGO, type in the following:

Inverse:Pt..Pt/Curve Inverse:Pt..Pt..Pt
Enter From Point: <1>2..3..1

Three point inverse between 2 , 3 , 1
Baseline : 646.386 Offset : -123.927
Angle Right: 27.1603 Angle Left : 332.4357
Distance from 2..3 = 886.824
Distance from 3..1 = 270.497

In my example, it measured from point 2 to 3 as the baseline with the perpendicular measurement to point 1. You will get the above output in the command line and a dialog on screen, showing the same information.

Glen W. Cameron, C.E.T.
City of North Bay, Ontario

Richard Sands

Perpendicular Offsets

Post by Richard Sands » Mon Oct 20, 2003 8:54 pm

I find the routine'PERP_TIES' works much better for a lot of points.
Its found under Microsurvey - Ties/Leaders/Symbols - Multiple Perpendicular Ties. The output can be used to report on as many offsets as wanted - a nice routine.
A COGO command could be added where it 'locks' on the first 2 points defining the line and then all is required is the typing of a new point ad infinitum (or however its spelled).
Not sure whether you were familiar with that?
Richard Sands

T.M. Moretz
Posts: 79
Joined: Fri Nov 08, 2002 1:31 pm
Location: North Carolina, USA

Perp dist

Post by T.M. Moretz » Sun Oct 26, 2003 8:53 am

Thanks Glen,
even the easiest of things can be forgotten.

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