Physical feature surveying in Bangladesh
Ground-based topographic mapping using real time kinematic global positioning system (RTK GPS) is a useful tool for collecting high resolution elevation data at the landscape level. RTK GPS is mobile, collects data quickly, and measures elevation within an accuracy of 1–5 cm.
In the early 1990s, RTK technology (Real Time Kinematic) was born and the GPS industry hasn’t looked back. RTK allows the user to obtain centimeter-level positioning in real-time. That is the point when using GPS for staking be-came possible and GPS for topographic surveys became very efficient. RTK is the fundamental technology that makes ma-chine control possible.
The basic concept behind RTK is that you have a base station receiver set on a known point somewhere around the project site. The base station receiver sends correction data to the surveyor who is operating the survey receiver (Rover). The correction data is typically sent via UHF or spread spectrum radios that are built specifically for wireless data transfer. The corrections from the base station receiver can be sent to an unlimited number of rovers. Real-time positions on the rover receiver are calculated as fast as 20 times per second or as little as once per second. For staking and topo where the rod person will be carrying the range pole (as in the picture at the right), once per second is plenty fast enough. coordinates used in the design file. Once that is done, you are ready to stake. You can work in Plane or an assumed coordinate system.