Application Of Domestic Airborne LiDAR In Tidal Flat Surveying And Mapping

Airborne LiDAR technology,as a more efficient surveying and mapping means,has been introduced to complete the beach mapping work.With the rapid growth of the economy,the beach resources,as an important reserve land resource,have an immeasurable value for development.There is a large area of beach area in the eastern part of China,which is distributed centrally and occupies an important location advantage.The comprehensive industry of agriculture and animal husbandry still has great potential to develop.In order to meet the needs of economic development,it is urgent for us to grasp and develop the resources of tidal flat,and to monitor the current situation of coastal belt resources development and the change of coastline in real time.Therefore,airborne LiDAR technology has the characteristics of high precision,short operation cycle and diverse product results,so it becomes the first choice for beach surveying and mapping.After decades of development,the mature and reliable airborne LiDAR technology is gradually introduced by the Department of Surveying and mapping.At the same time,high precision 3D information can be obtained,which can quickly extract the features of the beach.It greatly reduces the cost of manpower and material resources,saves time and cost,and improves work efficiency in the face of large area of beach measurement.At present,the development of domestic airborne LiDAR tends to mature,and the SW-LiDAR equipment of Beijing 4D visionary company is relatively mature and stable in the ranks of domestic equipment.At the same time,some companies such as South surveying and mapping company are also working on the research and development of domestic LiDAR system.In the case of relative air height of about 2000 m,when using domestic SW-LiDAR equipment to collect point cloud data,the heading and side distance of point cloud can be controlled within 2m,and the elevation precision can reach the centimeter level.This paper mainly analyzes the application of domestic SW-LiDAR system in Dongying City,Shandong province.The main research contents are as follows:(1)Introduce the domestic SW-LiDAR system in detail.It includes the introduction of the SWDC digital aerial photogrammetry,the parameters of the camera,the working principle of the AP-3500 laser scanner and the various performance parameters,the working principle of the high precision position and attitude measurement system POS 2010,the advantages of the combined navigation,the scanning formula of the four tower mirrors in the SW-LiDAR system and the analysis of the measuring principle.(2)Combined with the project,the work flow of field flight is introduced in detail.It includes the principle of route design and the matters needing attention in practical work,the calculation process and principle of various flight parameters,the principle of producing eccentric components after the installation of the flight platform,and how to measure and calculate the operation standards of eccentric and external flight and the requirements of quality control.The whole process of data acquisition is introduced in detail.(3)Based on the data obtained from the project,the process of data preprocessing is summarized in detail.It includes the processing of POS data,and gives the accuracy report,the process introduction of image data processing,the design principle of the calibration field and the calculation of the main parameters,the principle of the calibration of three resettlement error,the emphasis analysis and the introduction of the point cloud filtering classification method.(4)Combining the LKDACM model and Otsu SAR image Coastline Extraction method,the application of InSAR technology and LiDAR technology in the coastline is compared and analyzed,and the advantages of airborne LiDAR at the technical level are confirmed again.This paper focuses on the detailed process of data collection,the main process of data preprocessing and the extraction methods of the main features of the airborne SW-LiDAR in intertidal tidal flat surveying and mapping.The introduction of data post processing is deficient.There is no specific introduction to the production process of digital products such as DEM and DOM,but from the obtained data quality analysis after subsequent processing,the topographic map of the scale of 1:10000 can be realized,the plane precision error is controlled at ±1.00 m,and the elevation accuracy is ±0.25 m.Products.Based on this,combined with GIS technology,3D visualization platform for coastline beach management can be realized,and the development and utilization of coastal shoals can be monitored in real time.Airborne LiDAR technology is recognized and popularized by marine surveying and mapping with its irreplaceable advantages.It shows more and more important value.