Ground point extracting method for complex terrain airborne laser radar data
An airborne laser radar and complex terrain technology, applied in the field of spatial information, can solve problems such as large errors
Inactive Publication Date: 2015-09-09
WUHAN MEASUREMENT OF SPATIAL INFORMATION TECH CO LTD
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[0004] In order to solve the above-mentioned technical problems, the present invention provides a ground point extraction method for complex terrain airborne lidar data in view of the existing ground point extraction algorithm that has relatively large errors when processing complex terrain airborne lidar data. In order to achieve the purpose of improving the accuracy of ground point extraction in complex terrain areas
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[0058] In order to describe the technical content, structural features, goals and effects of the present invention in detail, the following examples are given to describe the embodiments in conjunction with the accompanying drawings.
[0059] see figure 1 shown, combined with figure 2 As shown, the present invention is a kind of ground point extraction method facing complex terrain airborne lidar data, comprising the following steps:
[0060] Step 1. Obtain the initial ground point set, use the moving grid method to extract some ground points from the airborne lidar data, and call this ground point the initial ground point, while other laser footpoints in the airborne lidar data called candidate ground points;
[0061] Step 2, constructing an irregular triangulated network (Triangulated Irregular Network, TIN) model for the initial ground points extracted in step 1, the irregular triangular network model can be considered as the surface model composed of the currently extra...
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The invention discloses a ground point extracting method for complex terrain airborne laser radar data, which comprises the following steps: an initial ground point set is acquired, and a moving grid method is used for extracting ground points in the airborne laser radar data; an irregular triangular net model is built for the initial ground points, wherein the irregular triangular net model is a ground surface model formed by extracted ground points; the nearest distance between each candidate ground point and the extracted ground points is calculated, and an encryption priority of each candidate ground point is acquired; according to the encryption priority, each candidate ground point is judged one by one, and encryption priorities of candidate ground points in a foot point field are updated; and the extracted ground points serve as the ground points obtained finally. The invention provides a ground point extracting method for complex terrain airborne laser radar data, so as to solve the problem that large errors exist in handling the complex terrain airborne laser radar data by the prior ground point extraction algorithm and achieve the purpose of improving the complex terrain region ground point extraction precision.
Description
technical field [0001] The invention belongs to the technical field of spatial information, and in particular relates to a method for extracting ground points facing complex terrain airborne laser radar data. Background technique [0002] Airborne Light Detection And Ranging (LiDAR) is a rapidly developing terrain mapping technology. The working principle of the airborne laser radar is to calculate the distance from the laser emission point to the surface according to the propagation time of the pulse from the pulse to the pulse signal reflected by the surface, and then use the GPS (Global Position System, Global Positioning System) to provide the distance of the emission point. Three-dimensional space information and the attitude information of the flight platform obtained by the attitude measurement system are used to determine the coordinates of the reflection point on the ground surface. This technology plays an irreplaceable role in some areas where it is difficult to ...
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Login to View More IPC IPC(8): G01S7/48G01S17/89
CPCG01S7/4802G01S17/89
Inventor 高广张良凡孝举潘振华胡高文
Owner WUHAN MEASUREMENT OF SPATIAL INFORMATION TECH CO LTD