Remote Sensing Mapping

Remote Sensing Mapping

Lidar Application In Laser Mapping

Introduction To Remote Sensing


      Since the late 1960s and early 1970s,  most traditional aerial photography systems have been replaced by airborne and aerospace electro-optical and electronic sensor systems. While traditional aerial photography works primarily in the visible-light wavelength, modern airborne and ground-based remote sensing systems produce digital data covering the visible light, reflected infrared, thermal infrared, and microwave spectral regions. Traditional visual interpretation methods in aerial photography are still helpful. Still, remote sensing covers a wider range of applications, including additional activities such as theoretical modeling of target properties, spectral measurements of objects, and digital image analysis for information extraction.

     Remote sensing, which refers to all aspects of non-contact long-range detection techniques, is a method that uses electromagnetism to detect, record and measure the characteristics of a target and the definition was first proposed in the 1950s. In the field of remote sensing and mapping, it is divided into 2 sensing modes: active and passive sensing, of which Lidar sensing is active, able to use its own energy to emit light to the target and detect the light reflected from it. 

 Active Lidar Sensing and Application


        Lidar (light detection and ranging) is a technology that measures distance based on the time of emitting and receiving laser signals. Sometimes Airborne LiDAR is applied interchangeably with airborne laser scanning, mapping, or LiDAR. 

        This is a typical flowchart showing the main steps of point data processing during LiDAR usage. After collecting the ( x, y, z) coordinates, sorting these points can improve the efficiency of data rendering and processing. In addition to the geometric processing of LiDAR points, the intensity information from LiDAR feedback is also useful.

Lidar flow chart

       In all remote sensing and mapping applications, LiDAR has the distinct advantage of obtaining more accurate measurements independent of sunlight and other weather effects. A typical remote sensing system consists of two parts, a laser rangefinder and a measurement sensor for positioning, which can directly measure the geographic environment in 3D without geometric distortion because no imaging is involved (the 3D world is imaged in the 2D plane).

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