Direction Angle

an angle that characterizes the direction of an arbitrary straight line with respect to an initial direction, particularly with respect to a coordinate axis. In geodesy, a distinction is made between a direction angle on an ellipsoid and a direction angle in a plane (of a projection or of a topographical map). In a plane (Figure 1), the direction angle α₁₂, which at the point P₁ has the direction P1P₂ to the point P₂, is defined as the angle at P₁ (in a clockwise direction) between the straight line parallel to the .Y-axis and the directed line P₁P₂. The direction angle is a basic concept in geodesy and is also used in artillery, navigation, and other fields.

Figure 1

单词	direction angle
释义	Direction Angle Direction Angle an angle that characterizes the direction of an arbitrary straight line with respect to an initial direction, particularly with respect to a coordinate axis. In geodesy, a distinction is made between a direction angle on an ellipsoid and a direction angle in a plane (of a projection or of a topographical map). In a plane (Figure 1), the direction angle α₁₂, which at the point P₁ has the direction P1P₂ to the point P₂, is defined as the angle at P₁ (in a clockwise direction) between the straight line parallel to the .Y-axis and the directed line P₁P₂. The direction angle is a basic concept in geodesy and is also used in artillery, navigation, and other fields. Figure 1
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