17. SETTING-OUT ARC
114
Specifying points and curve parameters
Parameters that can be entered may be restricted depending on the points spec-
ified in step 5/6. Parameters that can be entered are marked with a circle ( ○ ).
Those that cannot are marked with a cross ( × ).
Precaution when performing setting-out arc
In the following cases parameters cannot be calculated:
when Radius<
When Arc<Chord
When Tan In × 2<Chord
When the included angle between the back tangent and the azimuth angle
between the From Pt. and To Pt is 0°, or exceeds 180°.
Parameters
Set
coord
Radius Angle Arc Chord Tan In Bk
tan
Directi
on
To pt
Center pt
× ×××××○
To pt
Intersect pt
× ×××××○
Center pt
Intersect pt
× ×××××○
To pt
○ ○○×○○○
Center pt
× ○○○○×○
Intersect pt
○ ○×○××○
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