A correction method for echo intensity value of airborne lidar data in non-vegetated area

Abstract

The invention belongs to the technical field of remote sensing and mapping, and specifically relates to a non-vegetation-covered area airborne LiDAR data echo intensity value correction method. The method includes following steps: performing primary correction of an echo intensity value based on the flying height and the laser point elevation value, and performing homogenization on the influences of the laser transmission distance on the echo intensity value; calculating the tendency angle values of laser points point by point by setting a threshold determination condition and taking the plane distance value, the elevation value and the echo intensity value as references based on LiDAR data after primary correction; and calculating the reflection angle with the combination of the tendency angle and an incidence angle, and performing correction calculation on the echo intensity value of the original LiDAR data again. According to the method, the technical problem of difficult realization of airborne LiDAR data echo intensity value correction of non-vegetation surface features, especially inclined surface features in the prior art is solved, the airborne LiDAR data echo intensity value can better reflect the surface feature media attributes, and the application values thereof in surface feature classification and identification are improved.

Description

technical field [0001] The invention belongs to the field of remote sensing surveying and mapping, and relates to a method for correcting echo intensity values ​​of airborne LiDAR data. Background technique [0002] Airborne LiDAR (Airborne Light Detection And Ranging, LIDAR) is a new type of measurement technology that has developed rapidly in the past ten years. Generate digital products such as DEM. The laser point cloud data is that the laser rangefinder emits laser light to the ground, and calculates the three-dimensional coordinates of the ground point by calculating the angle of the emitted laser light and the return time of the pulse signal. In addition to spatial coordinate information, the content recorded in the lidar point cloud data also includes information such as echo intensity, echo sequence, and scanning angle. Among them, the echo intensity value is the laser pulse signal returned after being reflected by the ground object, which is induced by the receiv...

AI Technical Summary

Problems solved by technology

But in reality, many basic parameters of lidar equipment are difficult to obtain, so the application of radar equations is more difficult, and it is also difficult to obtain accurate atmospheric parameters during aviation flight, which greatly limits the application of echo intensity values

Images