Compass bearings

[Treehugger]

Can anyone explain how I translate compass bearings taken in the field to position points on the page. I am shooting the positions of trees from a control point with a laser rangefinder with inbuilt compass. The resultant reading gives distance and azimuth - how do I plot this point in autocad?

 

Any assistance greatly appreciated.

[H'Angus]

Can anyone explain how I translate compass bearings taken in the field to position points on the page. I am shooting the positions of trees from a control point with a laser rangefinder with inbuilt compass. The resultant reading gives distance and azimuth - how do I plot this point in autocad?

 

Any assistance greatly appreciated.

 

How many readings are you talking about? If it's just a handful then I'd probably just draw construction lines from your control point using the distance and angles ( see this thread for inputting distance and angles).

 

if you have lots of readings then that might be a bit long winded, so you could convert the readings into coordinates, either calculate them yourself (which isn't much fun) or you can use a free program such as Forward/Inverse by Mentor Software to calculate the coordinates, then just add points or blocks at those coords.

[lpseifert]

Assuming by azimuth you mean the angle right from north...

In Units set your angle Clockwise; set your direction North

 

Again an assumption that your base point is 0,0...

you can draw a pline from the base point as such (distance =100, azimuth= 75 degrees)

Command: pline

 

Specify start point: 0,0

 

Current line-width is 0.0000

Specify next point or [Arc/Halfwidth/Length/Undo/Width]: @100

or if you want a point, you can use From

Command: point

 

Current point modes: PDMODE=3 PDSIZE=0.0000

Specify a point: from

Base point: 0,0

: @100

[Treehugger]

Thank you for the quick responses.

Very helpfull indeed.

Thanks for the links H'Angus. I am going to check out the forward/inverse software.

 

regards

 

Treehugger