MEASUREMENT AND ACCURACY ASSESMENT OF COORDINATES USING TOTAL STATION AND AERIAL PHOTOGRAMMETRY

Abstract

Nowadays several methods are used to determine object coordinates. This research discuss the accuracy quality, time consuming and economic efficiency of two main survey methods, EDM and aerial photogrammetry.

Accuracy is defined that how closely the measured quantity nearest to the true value or the most probable value.

The project including collection of 31 control and check points which are distributed on four quarters on the model, and are collected (surveyed) using electronic distance measurements instrument.

ZI-imaging photogrammetric software was used to build three photogrammetric models using three, six and nine EDM surveyed points. An accuracy assessment of the surveyed check points and the corresponding photogrammetry points of the three models was tested and reported.

The important of this project is realized by comparing the result of the EDM, and photogrammetry technique in terms of time consuming, accuracy and economical efficiency.

It found that the photogrammetric works have less time than the land survey method, when the number of control points increase to accomplish the model, the RMSE decreases and the accuracy increase, photogrammetric maps can be printed at large scale such as 1:1000 with accuracy reaches to sub meters, and 2m contour interval.