Coordinate list rotation

Discussion of FieldGenius related issues and questions.

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Coordinate list rotation

Postby Ed Gasbarre » Mon Sep 22, 2003 12:02 pm

FieldGenius requires the input of a rotation angle in order to rotate the current coordinate list. Sometimes, with the absence of a calculator, this is a messy problem. Is there a way to specify rotation based on existing points? For example 1..2-6..3.
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Rotating Points

Postby Glen Cameron » Tue Sep 23, 2003 5:26 am

Under the PNT menu -> Rotate/Scale/Shift Points -> under the Rotate/Scale tab -> in the Rotation field. If you type in 1..2..3 in the field, it will calculate the angle from 1 to 2 to 3 and when you go to the next field down, it will calculate the angle and enter it into the field.

Cheers,
Glen W. Cameron, C.E.T.
City of North Bay, Ontario
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Postby Jason Poitras » Tue Sep 23, 2003 5:34 pm

Hi Ed,

Glen's note is correct if you're calculating the interior angle of two intersecting lines. I think you're asking how to subtract the direction of two line that don't intersect. All you need to do is in the rotation field type 1..2 - 6..3. *****Make sure to put a space before and after the negative sign*****

This will compute an angle, bearing 1 to 2 minus bearing 6 to 3.
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