Angle can be measured by using a THEODOLITE.

Electronic Distance Measurement Instruments, Total station and GPS.

Again, distance can be measured by using various instruments like chain, tape.

Whatever the method the provision of control points, includes the measurement of two entities( Distance and Angle).

There are several numbers of methods like traverse, triangulation etc., to provide these control points.

The purpose of any survey is to prepare maps, control points formed a basic requirement for the preparation of these maps.

The total station is an electronic theodolite (transit) integrated with an electronic distance meter (EDM), plus internal data storage and/or external data collector. It is also used by archaeologists to record excavations as well as by police, crime scene investigators, private accident Reconstructionists and insurance companies to take measurements of scenes. A total station is an electronic/optical instrument used in modern surveying.Data can be downloaded from the total station to a computer and application software used to compute results and generate a map of the surveyed area.Angles and distances are measured from the total station to points under survey, and the coordinates (X, Y, and Z or northing, easting and elevation) of surveyed points relative to the total station position are calculated using trigonometry and triangulation.The basic properties are unsurpassed range, speed and accuracy of measurements. Total stations are developed in view of the maximal convenience of work of the user. High-efficiency electronic tachometers are intended for the decision It has the broad audience for sole of industrial problems.The measurement results can be recorded into the internal memory and transferred to a personal computer interface. The Total station is designed for measuring of slant distances, horizontal and vertical angles and elevations in topographic and geodetic works, tachometric surveys, as well as for solution of application geodetic tasks.

Free tds survey link software