| With the rapid development of computer technology,a new generation of computer technologies such as Internet of Things technology,3S technology,and big data processing are becoming more and more widely used in agriculture,which promotes the rapid development of precision agriculture.Geographic Information System(GIS)is a technical system used to study spatial information.It is a fringe discipline formed by quoting computer technology from disciplines such as geography,surveying,cartography,remote sensing,and graphics.It is based on geography and mapping,supported by computer technology,and gradually developed into a diversified,informatized,and industrialized discipline.At present,GIS has been widely used in land,environment,transportation and economic construction.The secondary development of GIS is a key technology for implementing "precision agriculture" practices.While the rapid development of information technology and three-dimensional simulation technology,the development and application of three-dimensional GIS technology is gradually maturing.Three-dimensional GIS can perform spatial analysis on three-dimensional objects,enabling users to more truly perceive the objective world and presenting a large amount of spatial geographic information in front of the user.However,the development of three-dimensional GIS technology in modern agriculture is relatively slow.This article is based on the National Spark Program "Internet of Things-based corn precision operation technology integration and demonstration" and other topics,through the effective combination of three-dimensional GIS technology and intelligent decision-making technology,conducted a three-dimensional GIS based soil nutrient evolution trend of precision corn working area.The main contents are as follows:(1)Data acquisition and processingIn the national “863” project “Research and Application of Corn Precision Operation System” and the National Spark Program “Integration and Demonstration of IOT-based Corn Accurate Operation Technology”,with the strong support of the project,we collected and organized the Helong Town of Nong'an County,Jilin Province.Accumulation of large amounts of soil nutrient data during the four years of continuous precision corn production in Jiadian Village from 2014 to 2017.Using GIS and GPS techniques,comprehensive analysis and processing were conducted on the five nutrient data of selected soil available phosphorus,alkaline nitrogen,available potassium,PH value and organic matter.(2)Analysis of soil nutrient evolution trends in precise maize field based on 3D GIS spatial analysis technologyFirst,the Kriging interpolation method was applied to analyze the spatial distribution characteristics of soil nutrients,and the sampling points of soil nutrients at each point in the precise maize field were calculated.Then,using Arcscene technology to create a three-dimensional model to achieve the transformation of two-dimensional to three-dimensional model.In addition,three-dimensional space thematic maps of soil available phosphorus,available potassium,alkali-hydrolyzed nitrogen,pH,and organic matter in soils of precision maize were established during the period of variable fertilizer application from 2014 to 2017.Through the comparison of the three-dimensional thematic maps,the evolution trend of soil fertility characteristics was analyzed.The results of the study showed that after 4 years of variable-rate fertilization,the difference in soil fertility tended to be flat,validating the effect of precision fertilization.(3)Maize precise operation management system based on three-dimensional GISAccording to the above research results,the system was developed based on the.NET platform.The main functions of the system include four modules: geographic information query,spatial analysis,production forecast,and precision fertilization.The system has realized the visualization of the three-dimensional space thematic map of soil nutrient content in the precision agriculture working area of maize,and provided a decision basis for the implementation of the precise operation of farmland to a certain extent,and proposed a new reference basis for the precise operation of farmland. |
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