Arcs and calls are the feature names used in representing line information. Arcs are curved lines drawn around a chord at a given angle. An arc requires the same information found in a call plus radius and directional information for the arc. The two forms for an arc are tangent or chord. An arc can be placed in a map by entering the arc distance (the length/distance of the arc itself) or by entering the chord distance (the length/distance of the chord). Arc Distance The arc distance is the actual length of the curve on along the arc. Azimuth An azimuth is an angle from 0 degrees (north) to 360 degrees (number of degrees in a circle). An azimuth of 330 degrees would represent a bearing of "N 30 W".
A bearing is method for conveying direction and is composed of three parts. In the example "N 30 W" the first component N, is the North or South general direction. The angle in degrees is the second component. The final component is the general direction East or West. Orientation The orientation is the direction of an arc described as clockwise or counter clockwise.
Calls and arcs are the feature names used in representing line information. Calls are straight lines drawn from a beginning point at a specified angle for a specified distance. A standard form for the angle and length information is: direction (north or south), angle (degrees, minutes, seconds), direction (east or west), and length of the call in database units (distance)
Arc distance refers to the actual length of the curve along the arc.
An azimuth represents an angle from 0 degrees (north) to 360 degrees (number of degrees in a circle). For instance, an azimuth of 330 degrees would indicate a bearing of "N 30 W".
A chord is a line segment that joins two points on a curve. Chord Distance The chord distance is the length of the segment that joins the two points on a curve.
Closure Error Closure error is a calculated value based on the distance from the end point (last point in the survey) back to the first point in the survey. The closure error is a percentage value which is zero if the last point ends on the exact location of the first point. The resulting percentage value increases as the distance from the last point to the first survey point increases.