Application Of UAV Aerial Survey In Monitoring Soil Salinization In Farmland

The safety and sustainable development of farmland resources in agriculture is an important research direction.It solves the problem of arable land and solves the problem of farmers 'food and clothing.It has great significance for China to achieve a well-to-do society in an all-round way.The use of drones in China has become more frequent.The use of drones can greatly save manpower,material resources,and costs.In addition,drones are simple and accurate.At present,it plays a pivotal role in rescue and disaster relief,farmland land planning and utilization,and agricultural monitoring.The research content of this paper is to use drones to carry out aerial surveys of the measured area,to obtain orthographic images,and finally to manually assist Matlab software to classify the degree of salinization of the land in the area,to obtain the degree of salinization of the land in each area,and then conduct drone aerial surveys on a regular basis.The results of land salinization monitoring in the area are formed.The key problem that needs to be solved first is to obtain and obtain the high-precision topographic map of soil degradation phenomena such as salinization and secondary salinization in farmland.Due to the vast area and arid environment,relying only on manpower to measure three-dimensional terrain is unfavorable to the real-time data,and manpower measurement often takes a long time.Therefore,the drone can solve this problem perfectly,and the traditional manual measurement can no longer meet the demand for real-time data.The main research ideas and achievements of this paper are as follows:(1)This paper first introduces the classification of UAVs according to different uses,the advantages of UAVs,and the research on the deployment of foreign control points before UAVs fly.Then a brief introduction was made to the general situation of the Jingdian irrigation area in Gansu Province.After the route planning was completed,the aerial survey of the drone was started,and the original photos taken by the drone were finally obtained.(2)The data processing process of UAVs is analyzed,including image preprocessing,aerial triangulation,image splicing,and the production of final digital elevation models and orthographic images.(3)The requirements for the accuracy control of drones are analyzed,and the requirements for accuracy are analyzed from the processes of aerial triangulation and image splicing,and the impact of tilt angles on the plane and elevation displacementof image points is proposed.At last,some methods of correcting the relative precision are put forward.(4)The degree of salinization of the land in the saline-alkali land in four of the areas surveyed was quantified,and the quantitative criteria for salinization in the regional land were put forward,and the degree of salinization of the land in the four areas was finally obtained.Finally,the prospect is put forward.In the follow-up work,the aerial survey of regional land use drones is conducted regularly,and the data for measuring the degree of land salinization is measured,and a comparative record is formed,and finally the monitoring data for land salinization is formed.