在工业化时代,重金属污染愈加严重,国内外对此问题也愈加重视.大气环境中,重金属极易附着于大气颗粒物,并随着颗粒物进入人体,对人体健康造成危害.本文论述了大气颗粒物中重金属检测的预处理方法和主要检测技术.通过对大气颗粒物重金属的国家环境监测方法标准进行分析发现,在精密度和准确度方面,电感耦合等离子体质谱法更占优势;从检测过程方面看,X射线荧光光谱法的样品预处理等更为便利;同时X射线荧光光谱法和电感耦合等离子体原子发射光谱法所需费用相对较高.

大学专业概论课是专业课程体系的绪论,其专业内容注重理论的思辨性和思维的统摄性,是专业课程思政建设的先导.以测绘类专业"地球科学概论"为例,立足于地球不同圈层的基本特征、圈层的相互作用关系及其对地球表层和人类的影响三大板块,从课程思政建设的可行性、课程思政教学环节设计、思政育人成效评估等方面,深入挖掘专业知识的思政元素和思政故事,探索测绘类专业的课程思政建设模式,以期在课程教学过程中做到能力培养和素质提升共同进步,实现高校教育教学全过程和全方位育人.

针对典型的接收信号强度指示(RSSI)测距定位精度较低且不稳定的问题,提出一种基于狄克逊检验法高斯均值中值(DGMM)加权混合滤波RSSI的高斯牛顿定位算法.采用狄克逊检验法剔除观测信号异常值,接着对近似高斯分布的信号值进行加权混合滤波处理,最后利用高斯牛顿迭代求解目标点坐标.实验结果表明,经过DGMM加权混合滤波处理RSSI后,定位的平均点位误差为1.523 m,定位精度优于单一滤波且更稳定.

目前国内高校教学质量评价多针对教师,这种评价方式无法全面、客观地掌握学生的学习成效.文章基于OBE理念,研究构建高校教学质量管理体系的有效路径.通过建立完善的教学组织机构,构建校、院、系三级教学过程质量监控机制;建立以学生为主体的综合评价体系,定期对教学质量进行全面检查和客观评价;同时不断推进教学改革,注重过程性考核与管理;鼓励教学创新,加大学习挑战度,这些改革构想和措施能够提升学生自主学习能力,确保培养目标实现.

污染评价可以确定土壤质量状况并为污染治理等工作提供科学依据.以南京玄武区藤子村表层土壤中6种重金属元素为评价因子,分别采用主成分分析法、相关系数法以及灰色关联度法定权,通过区分度比较了评价结果的稳定性,并选择较可靠的结果进行空间插值生成污染情况专题图.评价结果表明:采用GRA-TOPSIS法的评价结果更可靠,得到的土壤污染情况与实际相符;在土壤重金属污染评价中,TOPSIS法有较高的适用性.

GIS与地统计学已广泛运用于土壤科学的研究.为调察研究玄武湖公园内陆区域土壤重金属污染情况及空间分布的特征,为污染评估治理提供可视化的科学依据,本文采集并分析了玄武湖内陆地区0～20 cm土壤中Cr、Cd、Ni、Pb、Zn和Cu 6种元素含量,对其进行描述性统计分析判断污染情况,并利用ArcGIS分析其污染情况及空间特征,结果表明,Cd超标率高达97.5％且平均值0.25高于国家一级标准1.23倍,存在轻微污染,其他5个元素均值均低于一级标准且超标率均低于21％,基本不存在污染的情况.从空间分布来看,Pb、Zn和Cu含量从内向外呈增大趋势,Cr、Ni整体浓度值相对偏小,大部分区域含量均在中值附近或以下,以上5种元素块基比均在0.5左右,含量及分布均是由随机因素及结构性因素共同控制,而Cd块基比仅0.028因而其分布规律则主要受结构性因素影响.

In this paper, the motion law of forestry robot was analyzed based on integrated navigation of the single station DGPS and DR. According to the characteristics of nonlinear motion equations and linear navigation data, the scaled un-scented transformation was used to linearize the equations of motion, and then extended Calman filter was used to process integrated navigation data. This paper describes handling process, and simulates the results of this method, and compare with other methods. The results showed that this method had a high speed of solving and good reliability, and did not loss the location accuracy.

The key point researched by many scholars in the field of surveying and mapping is how to use the given geodetic height H measured by GPS to obtain the normal height. Although many commonly-used fitting methods have solved many problems, they all value the pending parameters as the nonrandom variables. Figuring out the best valuations, according to the traditional least square principle, only considers its trend or randomness, which is theoretically incomprehensive and have limitations in practice. Therefore, a method is needed not only considers its trend but also takes randomness into account. This method is called the least squares collocation.

The WebGIS development has some own limits by the map servers of ArcGIS Sever or SuperMapiServer,which causes that the map server cannot be customized flexibly.We used the information exchange based on XML to construct own map servers,and proposed the general design of the map servers for realizing the function models,such as Socket correspondence,XML analysis,map object pool,multithread processing,core GIS processing and so on.The article realizes to customize the map services flexibly to develop WebGIS by using XML information exchange.

On the foundation of exterior data exchange,the paper proposed the way of data exchange sharing based on the spatial ETL.Taking VCT as the unified data exchange format,combining with the thought of ETL data transition,the paper carried out data processing.Taking the interconversion from Geodatabase to VCT as example,the paper developed with ArcGIS module to implement the GIS spatial data exchange sharing.

Application framework has been a kind of very practical programming specification and design framework on the development of software.Through comparing the advantages and disadvantages of existing three kinds of plug-in exploitation methods,this article used the plug-in application development based on C#,utilized ArcGIS Engine to provide a set of complete embedded GIS component library and tool library,and completed the design and realization of the core of plug-in GIS frame,various functions and platform.The paper implemented GIS integration by utilizing the development advantages of dynamic plug-in loading configuration and the visualization component coordination modeling to construct GIS application fast.The platform is suitable for any GIS application integration and basic development platform related to GIS application(ESRI).

In order to realize gathering the urban components information fast,accurately and intelligently,a information acquisition collector integrating the inside and outside urban components was developed based on GPS,GIS and PDA.The technology of CORS,principle of distance intersection,theory of map roaming and database for urban components acquisition was investigated based on the integrated method in software design field.Firstly,we introduce CORS and the laser ranging technology in this paper.Secondly,by based on PDA pattern elaborate the basic principle and function of the collector.Then,analyze the key technologies,using CORS as the main mode,laser ranging intersection as auxiliary mode to determine the components spatial positions as well as the attribute data based on mobile GIS.Finally,introduce the development and test procedure of the device.Experiment shows that the accuracy of the poisoning results of urban components is about 20 cm,which meets the specification.Solve the problem of GPS positioning at the case of no signal.

Because the business of processing the emergent events is needed in the expressway,the article proposes a method of expressway mobile video monitor based on GPS combining with the development of current communication technology.How to fuse GPS coordination information into video image,and how to carry on the data transmission by 3G communication are studied,and the system composition and function realization are put forward.

In response to the problems which existed under traditional land supervision pattern,land supervision dynamic management system was set up by dint of GPS,GIS and GPRS telecommunication technology.The general structure and network frame of the system were expounded and partial core function of the inspection supervisory system was realized.The practice indicated that the system reduced the workload for law enforcement officials while carrying on the land scene survey and improved both work quality and efficiency.

Aiming at the teaching status and existing problems of "surveying" course of Nanjing Forestry University,the necessity of designing "surveying" paper library was expounded,pointing out that a paper-setting team with high quality and scientific paper-setting guidelines were the preconditions of building paper library.The key parts in paper library construction process included revising the teaching and examination programme,selecting test questions and grouping papers.And the steps of selecting test questions included the choice of question types,the determination of question difficulty coefficient,the determination of differentiation degree coefficient and the determination of covering range.Finally,the characteristics of established paper library were summarized form aspects of the scientificity and rationality of questions,the unification of marking standard,the reliability of scores and the comprehensiveness of examining students' acquired knowledge in different perspectives.

The logistics information service of SOA structure was studied to complete the system design of the logistics information management.Taking the cargo delivery service as an example,the flow step of delivery was analyzed and the Web service was designed according to the thinking process.Finally,in the system of logistics management,taking the cargo as main line and the operation numbers as the only identification,the operation of returning cargo into warehouse was realized through tracking the cargo circulation.This paper proposed the effective plan on constructing the spatial logistics system based on SOA,which would provide references for logistics information management and service in the future.

The paper research goal how to realize the spatial data development using SVG,And how to develop Web based on SVG the GIS system.The paper the first definition and carries on the detailed introduction to SVG under the Internet environment's application.Then researched how to process spatial data organization and encode based on SVG.The paper realized the diversion from spatial data to SVG.The paper still accomplished the diversion from campus map to SVG and put forward a newest model of Web GIS based on the way.The paper solve finally has realized the spatial data development question using SVG,And to developed Web GIS based on SVG to make an attempt.

Combined with the experimental teaching experiences of surveying for years,the teaching content was adjusted and updated according to the latest development of surveying.The measures of strengthening the management were proposed to overcome the weakness that the management and experimental equipments could not meet the teaching requirement.Meanwhile,the specific method of experiment inspection and examination was put forward to improve the comprehensive experimental ability of students.In this paper,the surveying experimental teaching was explored to guarantee it could keep up with the development of mapping specialty and achieve the objective of cultivating talents majoring in civil engineering.

目前测绘体系正由数字化向信息化转变,在信息化测绘体系下,培养应用型测绘专业人才的院校如何进行测绘工程专业建设,已成为专业人士的热门话题。本文总结南京林业大学测绘专业建设的实践经验,提出了明确专业定位和专业特色、加强各学科知识综合、增加实践综合能力测试、开展创新实践教育等专业建设新举措。

Transportation geographic information system (GIS - T) is the extension of GIS technology in transportation domain, and it is the integration of GIS and many kinds of transportation information analysis and processing technology. The most transportation facilities have the linear feature, so that GIS - T stresses on linear object processing compared with GIS. The dynamic segmentation technology is the effective method of simulating and analyzing linear feature, and is the essential module in transportation GIS.This paper considers the characteristic of linear feature, and discusses emphatically how to improve tradition mileage reference system, and choose the linear reference system suitable of GIS analysis on the basis of establishing highway network's topologic relation. The system is based upon the reference one of edges and nodes; it is flexible to provide the visit of coordinate geometry and topology structure of actual communication network.The paper puts forward data model of dynamic segmentation based on linear reference system. The dynamic partition technology establishes the punctual or striation entity and data connection, simulates the actual situation in transportation, for example, transportation signal marker and some section of roads. The paper implements the algorithm of dynamic segmentation based on linear reference system, realizes the result, and carries on its visualization by graphs and forms, which facilitates the following spatial analysis and assistant decision.