基于GIS的科普资源信息发布系统设计与实现

科普资源是进行科技普及的物质基础,是进行科技普及的先决条件。基于WebGIS的科普资源信息发布系统可以实现对科普资源的信息化管理,满足用户浏览科普资源信息、分析科普资源等全方位需求。本文分析了科普资源信息发布系统的需求,设计了系统的结构和功能,构建了系统数据库,实现了系统功能。     

衡水市滏阳河景观带植被配置分析

调查了衡水滏阳河岸景观带植被配置现状,在剖析景观带植被配置优势和问题的基础上,从适地适树,丰富季相景观,注重种植密度及乔灌藤花草合理搭配等方面提出了改进措施,以促进本区植被配置优化,充分发挥河岸植被的生态效益和社会效益。     

中国小冰期气候研究综述

通过对小冰期研究文献进行综述,并对已发表的小冰期温度和降水数据进行综合对比分析,探讨小冰期时期中国气候特征的区域性.结果表明,小冰期在中国地区不同区域代用指标记录中均存在,但是小冰期的起讫及持续时间具有区域差异性,温湿配置也不尽相同.小冰期的起始时间主要呈现出由西向东推移的趋势,即青藏高原最早,华北地区次之而东部地区最晚.温湿配置的差异主要体现在东部季风区小冰期时期总体上是冷干的气候环境,而西部地区气候变化则呈现冷湿的气候特征.     

一种地类图斑符号配置算法

地图符号配置是地图可视化的重要组成部分,传统的土地利用现状图制图中,地类图斑的符号化通过填充法或填绘法实现,但是这些方法不能解决符号的空间冲突问题。本文从地图认识的角度出发,归纳地类图斑的符号化规则,提出了一种地类符号配置算法,并利用C#语言、Arc Engine开发接口实现了该算法。实验结果表明,算法较好解决了地类符号与其他地物要素压盖问题。     

世博观光旅游线路组织模式研究

从旅游线路组织模式的研究角度,重点分析世博旅游线路组织模式与规律,有助于对旅游地进行客源市场定位和产品开发。基于旅游社国内世博旅游线路报价单,统计并分析大小华东区域旅游线路组织模式的类型、特征,以及旅游线路中旅游目的地的组合规律。结果表明:单目的地模式和完全环游模式是大小华东地区最重要的两种旅游线路模式;上海世博+古镇园林为主题的旅游路线最受世博游客欢迎;世博游客大都选择在小华东区域内进行游览;大小华东地区各目的地在旅游线路中出现频次存在较大的差异,整体上以上海、杭州、南京、苏州作为门户型和离境型旅游目的地。     

Qualitative satellite image analysis: Mapping spatial distribution of farming types in Ethiopia

Satellite images have enormous potential for qualitative land use analysis. This paper presents empirical results that demonstrate how normally invisible dimensions produced by land use can be identified by enriching satellite data with qualitative information from field studies.Land use can be defined as the intentional use of a specific piece of land resulting in patterns of ecological responses that are visible in the land cover and landscape. Responses to land use often result in a heterogeneous combination of reflectance in satellite images. Statistical methods used in the classification of satellite imagery are limited in their capacity to handle categories consisting of heterogeneous combinations of spectral values. To overcome this limitation, a contextual post-classification method has been used to map land cover configurations as related to different agricultural practices in the district of Sodo, Ethiopia.The results show that it is possible to map socio-spatial distribution of different agricultural and socioeconomic practices on a regional level by combining field observations and spatial contextual information. The empirical findings show local agricultural activity variations in cash crop production and subsistence agriculture in the Sodo district of Ethiopia.     

Use of Business-Naming Practices to Delineate Vernacular Regions: A Michigan Example

This article provides a history of efforts to map vernacular regions as context for offering readers a way of using business directories in order to construct a GIS-based map of vernacular regions. With Michigan as a case study, the article discusses regional-naming conventions, boundaries, and inclusions and omissions of areas from regional labels in order to offer educators ideas that can enhance classroom content on regions. This article concludes by providing suggestions for classroom activities collecting, analyzing, and discussing vernacular region patterns and processes in accordance with National Geography Standard Five at the eighth-grade level.     

Configuration analysis of deepwater S-lay pipeline

The safety of offshore pipeline has drawn a great deal of attention during deepwater installation due to the combined actions of high external pressure, axial tension, and bending moment. Meanwhile, the pipeline configuration has a remarkable effect on the structural behaviour of the tube. The special studies focus on the deepwater S-lay technique in the present paper. The stiffened catenary theory is applied to establish the static equilibrium governing differential equation of a pipe element, and the solution equations of the total pipeline configuration from a lay-barge over a stinger to the seabed are derived. The numerical iteration method for solving pipeline configuration is described in detail, and the corresponding program is developed to conduct the analysis of effects of various parameters such as laying water depth, pipe diameter, thickness of concrete weighted coating layer, stinger length, control strain, and axial tension on pipeline configuration. The results show that the laying water depth, the submerged weight of the pipe, and the axial tension are the critical factors influencing pipeline configuration. In addition, geometrical parameters of the stinger such as length, radius, and shape have an important effect on the pipe-laying capacity of the vessel. The validity of the program is further verified by means of a comparison with results obtained from the commercial finite element software OFFPIPE.     

Adaptive analysis of infinite beams dynamics problems using the periodic configuration update method in the time domain

This paper proposes a new approach for the assessment of the dynamic response of continuously supported infinite beams under high‐speed moving loads. A change in the representation of equations of motion in the dynamics of discrete structures is proposed to obtain an improved accuracy of the numerical integration in the time domain. The proposed numerical method called the “periodic configuration update” or “PCU method” is applied to solve the problem of a vertical moving harmonic load on an infinite classical Euler‐Bernoulli beam resting on a continuous viscoelastic foundation. This study shows the superiority of the proposed method in comparison with other methods presented in the literature that suffer from the material time derivative, i.e., convective terms, that arises from the Galilean transformation. To confront this numerical problem, the PCU method retains the principle of the spatial follow of loads while zeroing the relative velocity with the traversed beam via a step‐by‐step adaptive integration of the equation of structural dynamics. The dynamic load is modeled with high theoretical velocities that can reach the critical velocity of the studied beam with different angular frequencies belonging to moderate frequency range. A parametric study is carried out to analyze the influence of key parameters on the convergence. The obtained results show a high efficiency of the PCU method for solving these types of problems relative to the dynamics of high speed trains/tracks.     

Spatially filtered ridge regression (SFRR): A regression framework to understanding impacts of land cover patterns on urban climate

Understanding the impacts of land cover pattern on the heat island effect is essential for sustainable urban development. Conventional model fitting methods have restricted ability to produce accurate estimates of the land cover‐temperature association due to the lack of procedures to address two important issues: spatial dependence in proximal spatial units and high correlations among predictor variables. In this study, we seek to develop an effective framework called spatially filtered ridge regression (SFRR) to estimate the variations in the quantity and distribution of land surface temperature (LST) in response to various land cover patterns. The SFRR effectively integrates spatial autoregressive models and ridge regression, and it achieves reliable parameter estimates with substantially reduced mean square errors. We show this by comparing the performance of the SFRR to other widely adopted models using Monte Carlo simulation followed by an empirical study over central Phoenix. Results highlight the great potential of the SFRR in producing accurate statistical estimates, providing a positive step toward informed and unbiased decision‐making across a wide variety of disciplines. (Code and data to reproduce the results in the case study are available at: https://github.com/cfan13/SFRRTGIS.git .)