State of The Art Surveying Technology
Remember when surveying took a long time to finish?
Now we provide lightning fast topographic surveys using LiDAR.
LiDAR is an acronym for "Light Detection And Ranging". LiDAR Mapping is a versatile technology that can be used in multiple platforms; ground based, airborne and satellites. The system is multifaceted being able to operate in day or night regardless of light condition. LiDAR is state of the art, highly accurate technology providing detailed results. It has the ability to penetrate vegetation on a level not available before.
How LiDAR works.
Lidar uses light pulsing laser to determine the distance to the surface of the earth. It does this extremely quickly and with enough density even vegetation cannot block all the pulses to the ground. With each pulse it measures the time it takes for the light to hit the earth and return to its collection source. These times are recorded then converted to distances accordingly.
LiDAR requires four basics parts to operate:
- The LiDAR unit itself, which emits pulses of light.
- A GPS receiver tracking the unit’s x,y,z coordinates.
- An IMU which stands for Inertial Measurement Unit that tracks the tilt of the unit in space to achieve accurate elevation measurements.
- A computer that records all transmitted data.
Picture beside shows a LiDAR active sensing which penetrate vegetation and give us multiple returns depending on the vegetation density. Each returns will be measured in distances and classified as "ground" and "non-ground" based upon a classification algorithm tailored for the project scanning area. If somehow there is no "ground" captured, steps will be taken to maximize the number of points reaching the ground. And in post-processing, data classification will go to quality control to ensure that the "ground" is captured.
UAV LiDAR Technology
Picture above shows a flow diagram of our UAV LiDAR System. Using the base station we receive a real-time view of the rover (UAV/Drone in this case) capturing the data. This is through a network where the GNSS receiver on the ground, GNSS satellites and the UAV GNSS pinpoint positioning and relay it back to the ground station. The advanced IMU and LiDAR measure complete accuracy of positioning on the UAV providing us with the data set.