Surveying Flashcards
What is the formula for Tangent Distance?
T = Rtan(I/2)
What is the formula for Long Chord?
C = 2Rsin(I/2)
What is the formula for Length of the Curve?
LC= 20I/D
What is the formula for arc basis?
D = 1145.916/R
What is the formula for Middle Ordinate?
M = R (1- cos(I/2))
What is the formula for External distance?
E = R/cos(I/2) - R
What is the formula for subangles?
d = CD/20
What is the formula for subchords?
C = 20d/D
Point of tangency where the curve leaves the tangent
Point of Curvature(PC)
Point of tangency where the curve meets the other tangent
Point of Tangency (PT)
Point of where the two tangents meet
Point of Intersection(PI)
Angle of intersection of the tangents
Central Angle (I)
Tangent measured from PC or PT to the vertex of PI
Tangent Distance (T)
Arc length from PC to PT
Length of Curvature (LC)
Straight line drawn from PC to PT
Long Chord (C)
Radius of the circular curve
Radius
Distance measured from the vertex to the midpoint of the curve
External Distance (E)
Measured from the midpoint of the curve to the midpoint of the Chord
Middle Ordinate(M)
The point of the common tangent where the two curves join
Point of Compound Curvature (PCC)
Consist of two or more consecutive simple curves having different radius, but whose centers lie on the same side of the curve, likewise any two tangent at their meeting point.
Compound Curves
Subtended angle of the first curve
Central Angle of the First Simple Curve (I1)
Subtended angle of the second curve
Central Angle of the Second Simple Curve (I2)
Distance from PC to PI
Back Tangent (T1)
Distance from PT to PI
Forward Tangent (T2)
Point of Intersection of the first curve on a compound curve
Vertex of the First Simple Curve (A)
Point of Intersection of the second curve on a compound curve
Vertex of the Second Simple Curve (B)
Tangent distance of the first simple curve
t1
Tangent distance of the second simple curve
t2
Straight line from A to B of a compound curve
Common Tangent (AB)
