It is the art of measuring horizontal and vertical distances between objects of measuring angles between lines of determining the direction of lines and of establishing points by predetermined angular and linear measurements. The angular distance and altitude both certainly show change over time. Angular Measurement For Surveying An angle gauge lets you measure the surface angle easily against the horizontal axis in which using the protractor can be impossible to do. . No direct checks of angular measurement are available. And minutes into 60 seconds. Equilateral triangles are considered to be ideal triangles. Angles of triangles must not be less than 30 degree and greater than 120 degree. Such glass makes it easier to read the angles. The total station is the most common surveying instrument and the primary tool for all surveying levels. Surveying also includes the technique of establishing points by pred