绿色地信9号防治草莓白粉病药效试验

试验研究了不同浓度放线菌制剂绿色地信9号对草莓白粉病的田间防治效果,用多菌灵及清水作对照。结果表明,绿色地信9号300倍液的防效最好,喷药3次后7天防效为53.7%;其次为绿色地信9号500倍液,其800倍液的防治效果和多菌灵800倍液的防治效果相当。供试药剂在试验浓度范围内对草莓安全。

基于三维时空数据库的地信时空过程可视化研究

随着GIS数据不断更新,大量的GIS历史数据也不断累积起来。本文即是着眼于如何有效利用累积下来的多个时期的数据,模拟地信时空过程,让人们能直观了解空间信息的发展变化过程。论文先介绍了由地理信息时空数据建立的三维时空数据库,然后阐述了在此数据库支持下的地信时空过程可视化的实现技术。本文的研究是一次时态GIS与3D-GIS结合应用的尝试,实现了4D概念下更为逼真和动感的地理信息服务方式。

结合人工智能的地信专业创新能力培养

创新能力的培养是人才培养极其重要的一个方面。然而,当前地理信息科学本科专业教学仍然缺乏对学生创新能力的培养。为了解决这一矛盾,本文结合人工智能在地理信息科学中的应用对地理信息科学专业本科生的创新能力进行了探讨并提出解决方案。

遥感影像获取为测绘地信事业的发展提供有力保障

随着科学技术的迅猛发展,当前我国的遥感技术和智能化技术等相关方面有了巨大的进步,为我国国民经济的发展做出了极大的贡献,特别是在测绘地信事业的发展过程中,有效结合遥感技术做好影像获取工作,这样能够为测绘地信事业的发展提供坚定而有力的保障,为其提供根基。基于此,本文重点探讨和分析遥感影像获取技术的相关内容以及在测绘地信事业的发展过程中的有力保障作用,希望本文的简要分析能够为相关从业人员提供一定的启示。

智慧城市建设 地信企业扮演何种角色——专访易智瑞(中国)信息技术有限公司高级副总裁康铭

从电子政务到数字城市,再到现如今的智慧城市,我国信息化建设各个阶段都随处可见GIS身影.智慧城市服务提供商阿里、腾讯、华为、中兴、平安等的智慧城市技术解决方案中均少不了GIS,在智慧城市建设典型城市如上海、宁波、武汉、深圳、南京、厦门等的解决方案中,GIS也是无处不在.

不动产登记,测绘地信企业新机遇

不动产登记作为我国改革开放40年的历史进程中相对的一个新事物,事关产权保护、市场主体、经济体制改革和营商环境优化等方方面面,涉及千家万户,影响各行各业.做好不动产登记工作,对不动产权益人的权益保护、市场交易效率提升等都具有重要意义.

地信技术在自然资源调查与监测中的应用研究

在社会经济发展过程中自然资源管理是关键,随着城市化前进过程越来越快,合理规划和利用自然资源也是我国政府需要进行关注的重要内容之一。在自然资源调查与监测中,就要充分利用地信技术,通过地理信息技术支持,才能做好自然资源管理工作,并让自然资源得到合理利用和全面治理,并打下良好的生态文明建设基础。地信技术能够对对自然资源进行更加深入的调查和监测,利用调查和监测结果开展分析,达到到合理利用资源和保护资源的目的,所以地信技术应用在自然资源调查与监测中起到关键性作用,因此也应对其应用进行更加深入研究,保障自然资源能够持续发展。

新时代开启地信事业新征程

一元复始,万象更新,踏着2018年的第一缕璀璨阳光,我们开启了新时代地信事业大发展的新征程.“新时代要有新气象,更要有新作为.”习近平新时代中国特色社会主义思想在中华民族伟大复兴征程上矗立起思想的灯塔,

地信信息系统在矿山测绘中的应用研究

矿山的测绘工作是矿山生产规划、设计以及运营管理的基础,在实际测绘工作中,地信信息系统的应用发挥了较为重要的作用。本文对地信信息系统进行了简要介绍,主要分析了地信信息系统的特点和功能,地信信息系统在矿山测绘中的应用现状以及具体应用,根据以上分析结果,总结地信信息系统在矿山测绘中的发展前景。当前地信信息系统的功能还在不断优化,推动着矿山事业更好地发展。

中澳测绘地信专业本科教育比较与启示

在深入研究澳大利亚墨尔本皇家理工大学测绘地信专业教学模式基础上,从课程设置、授课方式、课程内容、考查方式等方面,以中国矿业大学环境与测绘学院测绘地信专业为例,比较中澳测绘地信专业本科教育模式,分析问题差距,得出中国高等教育测绘地信专业发展的有关启示。

N-th root slant stack for enhancing weak seismic signals

Seismic imaging of complicated underground structures with severe surface undulation(i.e.,double complex areas)is challenging owing to the difficulty of collecting the very weak reflected signal.Enhancing the weak signal is difficult even with state-of-the-art multi-domain and multidimensional prestack denoising techniques.This paper presents a time–space dip analysis of offset vector tile(OVT)domain data based on theτ-p transform.The proposed N-th root slant stack method enhances the signal in a three-dimensionalτ-p domain by establishing a zero-offset time-dip seismic attribute trace and calculating the coherence values of a given data sub-volume(i.e.,inline,crossline,time),which are then used to recalculate the data.After sorting,the new data provide a solid foundation for obtaining the optimal N value of the N-th root slant stack,which is used to enhance a weak signal.The proposed method was applied to denoising low signal-to-noise ratio(SNR)data from Western China.The optimal N value was determined for improving the SNR in deep strata,and the weak seismic signal was enhanced.The results showed that the proposed method effectively suppressed noise in low-SNR data.

A new type of fiber Bragg grating based seismic geophone

Aimed at the poor performance of conventional geophones in exploration for deeper and complex targets, we present the principle and theoretical design of a new geophone based on the optical fiber Bragg grating （FBG） sensing technology. The important parameters such as response functions are calculated theoretically. Because of the advantages of FBG sensing technology, the new FBG geophone has a high dynamic range of 94dB at （10-200 Hz）. This new generation of geophones will have wide use in seismic prospecting due to its higher sensitivity, lighter weight, and lower cost.

Intra-annual Vegetation Change Characteristics in the NDVI-Ts Space:Application to Farming-Pastoral Zone in North China

Land use/land cover change (LUCC) mapping and analysis using multi-temporal normalize difference vegetation index (NDVI) data have been well documented. Recent empirical studies have documented that many new methods with high accuracy of retrieved land surface temperature ( Ts) have been developed. Thus, the combination of land surface temperature and NDVI has the greatest potential to improve the surface vegetation dynamic monitoring. In this study, the following objectives are pursued to: (1) introduce the practical method to produce the Ts, NDVI and Ts/NDVI based on remotely sensed data; (2) investigate the different retrieved result of vegetation cover information from NDVI, Ts and Ts/NDVI data sets, and analyze the intra-annual time trajectories of different vegetation cover categories in the NDVI- Ts space for farming-pastoral zone in North China, and (3) quantitative analysis the difference in using NDVI, Ts and Ts/NDVI data sets to express information based on the indices (information entropy and averaged information grads), and evaluate the relative role of Ts/NDVI data set in the discrimination of different vegetation cover categories through comparison to traditional NDVI data set.

Design and Implementation of Biogas Plants Geographic Information System

[Objective] A kind of biogas engineering geographic information system was designed and realized.[Method] Based on the data of the investigation of the large and medium-sized biogas projects in Beijing,the system user＇s need and function demand were studied.Sub-system function was divided.By using SuperMap IS.NET,C# and SQL Server 2005 as the database and WebGIS frame,the system spatial and attribute database were designed so as to realize the WebGIS software of biogas project in Beijing.[Result] The system provided application platform for the distribution of biogas project information.User can realize the submission and inquiry the feedback of biogas project information based on system application right etc,so as to visually,fully and precisely inquiry project data.Based on the comprehensive analysis of data,the current state of biogas project and change trend were studied and decided.[Conclusion] The system provided convenience and services to relevant departments＇ planning and management of biogas project.

ASSESSMENT OF MILITARY AIRFIELD OBSTACLE FREE SPACE BASED ON GIS

A mathematical model of obstacle limit surfaces for military airfield obstacle free space is established through airfield obstacle free space analysis.Based on the model,triangle mesh elevation model of military airfield obstacle free space is built by using the software-ArcGIS,and the 3-D display result is obtained.It is convenient to evaluate military airfield obstacle for superimposing digital elevation model（DEM）with military airfield topographic map.Thus it improves the efficiency greatly.It lays the foundation for the application of geographic information systems（GIS）in the management of military airfield obstacle free space.

Source and hazard identification of heavy metals in soils of Changsha based on TIN model and direct exposure method

A total of 153 soil samples were collected from Changsha City, China, to analyze the contents of As, Cd, Cr, Cu, Hg, Mn, Ni, Pb and Zn. A combination of sampling data, multivariate statistical method, geostatistical analysis, direct exposure method and triangulated irregular network （TIN） model was successfully employed to discriminate sources, simulate spatial distributions and evaluate children＇s health risks of heavy metals in soils. The results show that not all sites in Changsha city may be suitable for living without remediation. About 9.0% of the study area provided a hazard index （HI）1.0, and 1.9% had an HI2.0. Most high HIs were located in the southern and western areas. The element of arsenic and the pathway of soil ingestion were the largest contribution to potential health risks for children. This study indicates that we should attach great importance to the direct soil heavy metals exposure for children＇s health.

Forest resources variation along with the main rivers in typical forest re-gion of Changbai Mountain

The restoration of the riparian vegetation disturbed by human activities is one of the hotspots of watershed ecology. Through interpreting the images of Remote Sensing in 1985 and 1999, the basic information of forest resources of Lushuihe Forest Bureau, which is a typical forest area of Changbai Mountain, was obtained with support of GIS. By dividing Land covers of Lushuihe area into 10 types (water body, residential land, stump land, farming land, wetland, mature conifer forest, midlife conifer forest, mature broadleaf forest, midlife broadleaf forest, and man-made young forest) and dividing the riparian zone into four buffers (in turn, 1000, 2000, 3000, 4000 m away from the river), the changes of riparian forest resources during 1985-1999 were analyzed. The results showed that the deforestation intension has obviously decreased and the whole environment has been evidently improved, but the riparian ecosystem was still flimsy. In buffer 1, 2, 3, the area of midlife conifer forest increased largely, but the areas of other types of land covers all decreased. Midlife conifer forest had a comparatively good status in the three buffers. In buffer 4, midlife conifer forest, mature conifer forest, and mature broadleaf forest formed a forest-age rank that is helpful to stabilize the forest ecosystem and exert its functions. Area percentage of wetland decreased in buffer 1, buffer 2, and buffer 3, even in buffer 4 in which forest ecosystem rehabilitated comparatively well, so protecting and rehabilitating wetland is a very difficult task.

The optimal fractional Gabor transform based on the adaptive window function and its application

We designed the window function of the optimal Gabor transform based on the time-frequency rotation property of the fractional Fourier transform. Thus, we obtained the adaptive optimal Gabor transform in the fractional domain and improved the time-frequency concentration of the Gabor transform. The algorithm first searches for the optimal rotation factor, then performs the p-th FrFT of the signal and, finally, performs time and frequency analysis of the FrFT result. Finally, the algorithm rotates the plane in the fractional domain back to the normal time-frequency plane. This promotes the application of FrFT in the field of high-resolution reservoir prediction. Additionally, we proposed an adaptive search method for the optimal rotation factor using the Parseval principle in the fractional domain, which simplifies the algorithm. We carried out spectrum decomposition of the seismic signal, which showed that the instantaneous frequency slices obtained by the proposed algorithm are superior to the ones obtained by the traditional Gabor transform. The adaptive time frequency analysis is of great significance to seismic signal processing.

The Second-generation Wavelet Transform and its Application in Denoising of Seismic Data

This paper discusses the principle and procedures of the second-generation wavelet transform and its application to the denoising of seismic data. Based on lifting steps, it is a flexible wavelet construction method using linear and nonlinear spatial prediction and operators to implement the wavelet transform and to make it reversible. The lifting scheme transform -includes three steps： split, predict, and update. Deslauriers-Dubuc （4, 2） wavelet transforms are used to process both synthetic and real data in our second-generation wavelet transform. The processing results show that random noise is effectively suppressed and the signal to noise ratio improves remarkably. The lifting wavelet transform is an efficient algorithm.

Scales,methods and technical analysis of China's residential environment evaluation

To improve China＇s residential environment evaluation system and enhance its guiding role, current research results are analyzed and summarized from three aspects including research scales, evaluation methods and applied technology by means of comparison, induction and empirical application. The guiding role of the current macro-scale evaluation system of urban planning and construction is generally not obvious, whereas the guiding role of medium and micro-scale systems to the improvement of residential environments is improving. There are diversified methods for determining the threshold values and the weights of indices in China＇s evaluation system. For instance, the analytic hierarchy process（AHP） method is adopted to determine the weights of indices. The advantages and disadvantages of the method are analyzed on the basis of empirical calculation. In the course of comprehensive analyses, a nonlinear model can reflect interactions among indices more than a linear model; the evaluation model under the ARCGIS platform prevails since it combines space and attribute, and it has intuitive results. So far, the methodological system of China＇s residential environment evaluation has not been established; its subject coverage and research category should be expanded, and its guiding role should be enhanced.