DIRECTIONOFALINE is defined as the horizontal angle the line makes with an established line of reference.
INTERIORANGLES the angle between two adjacent lines in a closed polygon
When the value of an interior angle is greater
than 180° it is referred to as re-entrantangle
EXTERIORANGLES are located outside a closed polygon and are referred to as explements of interior angles.
The angle between line and the prolongation of the preceding line are called DEFLECTION ANGLE
ANGLESTOTHERIGHT are measured clockwise from the preceding line to the succeeding line. These are also
referred to as azimuths from back line.
BEARING of a line is the acute horizontal angle between the reference meridian and the line
When directions are measured from the local magnetic meridian they are called MAGNETIC BEARINGS
If the bearing of a line is observed in the direction of the progress of the survey, it is referred to as FORWARD BEARING, if the bearing of the same line is observed in opposite
direction, it is called BACK BEARING.
Azimuthreckoned from NORTH -ordinary plane surveys
Azimuthreckoned from SOUTH -large scale geodetic surveys and astronomical observations
In surveying directions maybe defined by means of:
INTERIORANGLES
DEFLECTIONANGLES
ANGLESTOTHERIGHT
AZIMUTH
BEARINGS
AZIMUTH direction given by the angle between the meridian and the line measured in a clockwise direction from either north or south branch of the meridian