% offset command

Discussion of MicroSurvey CAD related issues and questions.

Moderators: Brian Sloman, Jason Poitras, James Johnston

% offset command

Postby Glen A. Quarmby » Mon Dec 30, 2002 4:13 pm

I am trying to calculate a point on one side of a road using a pin found on the other side for direction. I used the % offset command in the form of 1..2%+20.117 expecting a point to be created so that the road would be 20.117m wide..... It didn't work!
Is there a bug reported for this command?
Glen A. Quarmby
 
Posts: 32
Joined: Fri Nov 08, 2002 3:11 pm
Location: Campbell River, British Columbia

Postby Glen Cameron » Mon Dec 30, 2002 6:15 pm

I just tried a couple here and it seems to work for me.
Maybe try it without the + as it is not required to tell it to go to the right, only the - is required to go to the left.

====================================
> COGO
Inverse:Pt..Pt/Curve Inverse:Pt..Pt..Pt
Enter From Point: <5>3
Options: +/- or Pt..Pt+-Angle
Enter Quadrant Bearing like QDD.MMSS:<>: 3..4%-6
Options: C#=-*/sin/cos/tan... or Pt..Pt(+-*/) a Distance
Enter the Distance: <>:50
Enter the Solve Point: <6>6
Enter Description:<>:
3 N09°41'44"W 50.359 99.191 43.329 6
Inverse:Pt..Pt/Curve Inverse:Pt..Pt..Pt
Enter From Point: <6>3
Options: +/- or Pt..Pt+-Angle
Enter Quadrant Bearing like QDD.MMSS:<>: 3..4%8
Options: C#=-*/sin/cos/tan... or Pt..Pt(+-*/) a Distance
Enter the Distance: <>:50
Enter the Solve Point: <7>
Enter Description:<>:
3 S09°41'44"E 50.636 85.391 45.687 7

====================================

Cheers,
Glen W. Cameron, C.E.T.
City of North Bay, Ontario
Glen Cameron
 
Posts: 1395
Joined: Fri Nov 08, 2002 12:18 pm
Location: Corbeil, Ontario, Canada

Postby Glen A. Quarmby » Tue Dec 31, 2002 7:33 am

I see the problem. I was trying to use the offset from the second point to calculate a line. The command is used to calculate a point offset a line, not a line perpendicularly distant from a point - a different problem.
Having said all that is there a way to get the result I am looking for?
I have a pin on the east side of a road (Pt 1) and another pin some distance up the road to the north on the west side (Pt 2). I want to calculate the lot corners on the east side of the road north from Pt 1 using a perpendicular offset of 20m to Pt 2 as direction. I could draw a circle of 20m radius around Pt 2 and draw a line from Pt 1 to a tangent point on the circle but that is cheating. Is there a COGO command for this case?
Glen A. Quarmby
 
Posts: 32
Joined: Fri Nov 08, 2002 3:11 pm
Location: Campbell River, British Columbia

Postby Mark Budgen » Tue Dec 31, 2002 8:08 am

Hi Glen,

Just so I get this right, you want to create a new point on the East side of the road that 20 m from pt 2 and the azimuth from point #1 to the new point is unknown. The point we want to create must be along a line that is 20 m (Perp) from point #2 to the new line.

There are no other constraints in this problem like a distance or azimuth? Please let me know.
Mark Budgen
 

Postby Mark Budgen » Tue Dec 31, 2002 8:35 am

Glen,

If the information above is correct, you can solve for the point on the east side of the road using the Distance/Angle option in COGO. Follow the steps below to see the results you desire.

> COGO
Inverse:Pt..Pt/Curve Inverse:Pt..Pt..Pt
Enter From Point: <3>2
Options: +/- or Pt..Pt+-Angle
Enter Azimuth (DDD.MMSS):<>: <ENTER>
Options: C#=-*/sin/cos/tan... or Pt..Pt(+-*/) a Distance
Enter the Distance: <>:20.117
Enter the Solve Point: <3>3
Options: C#=-*/sin/cos/tan... or Pt..Pt(+-*/) a Distance
Enter Distance2: <>: <ENTER>
Enter Angle for Distance/Angle: <>90
Enter the To Point: <3>1

I hope this helps.
Mark Budgen
 

Postby Glen A. Quarmby » Tue Dec 31, 2002 9:01 am

That's what I was looking for!!
Thanks Mark
Glen A. Quarmby
 
Posts: 32
Joined: Fri Nov 08, 2002 3:11 pm
Location: Campbell River, British Columbia


Return to MicroSurvey CAD

Who is online

Users browsing this forum: Bing [Bot] and 1 guest

cron