REMOTE SENSING APPUCATION IN LARGE-SCALE SURVEYING (USING GLOBAL POsmONING SYSTEM, GPS)

Abstract

The coming of the GPS has been greeted with so much invincibility that the surveying profession looks unnecessary. What with the high accuracy guaranteed by this technique. Much myth is associated with what can be done with the GPS that it needs closer study. Large scale surveying on the other hand has been a difficult area of venture for most Remote Sensing techniques. The adoption of GPS to give a detailed survey at any scale is therefore a welcomed development. This project serves to illustrate possible ways of applying the GPS for large-scale surveying. In particular, two approaches are illustrated. (1) Obtaining co-ordinates of points, which could define a plot, purely by GPS, technique. (2) Combining the GPS with other surveying methods especially where controls are not existing. The GPS is used to set up these controls - to the highest level of accuracy and the traversing method used to complete the survey. This is most useful where the present cost of using the GPS solely could be tmbearable. The work therefore serves to buttress the fact that GPS is very much applicable in our area. Both results confirm acceptability of GPS observations and the need for all users to embrace it as quickly as possible. Some limitations or constraints in the use of GPS are highlighted