基于Matlab平台实现电法数据的三维可视化

电法三维数据采集和三维正反演获得的信息是三维分布的。对这些三维数据体进行快速有效的立体显示是展示电法成果的最好方式。结合电法数据的特点,以Matlab2010b为平台实现了电法数据的三维可视化。该程序可方便地用于研究电法成果的三维展布特征,也可为其他地球物理数据的三维可视化所参考。     

In-depth examination of spatiotemporal figures in open reproducible research

ABSTRACT

Figures such as maps and time series are essential means to visualize spatiotemporal results in scientific papers. Being able to recompute them using the underlying source code and data is thus a core aspect in reproducible research. However, many scientists see the preparation of code and data for publication as an additional burden without immediate benefits. In this work, we investigate advantages and new capabilities of reproducible research papers. Our key contributions are (i) the extension of a geoscientist’s workflow while examining papers including reproducible figures such as maps and (ii) the prototypical implementation of the workflow as a web application. The workflow is based on current practices of geoscientists and encapsulates benefits of reproducible figures. It is informed by ideas and needs identified by geoscientists in a survey, interviews, and a focus group. Based on their statements, we first extend the traditional workflow steps Discovery and Inspection by additional capabilities and propose two new steps: Manipulation of the content of a spatiotemporal figure and Substitution of the underlying code and data. The extended workflow and its implementation might facilitate in-depth examination and reusability of geoscientific results.     

Map-based multicriteria analysis to support interactive land use allocation

This article focuses on the use of map-based multicriteria analysis to develop a negotiation support tool for land use allocation. Spatial multicriteria analysis is used to make explicit trade-offs between objectives and to provide guidance and feedback on the land use changes negotiated by the participants. Digital maps are the means of communication among workshop participants, and an interactive mapping device (the ‘Touch table’) is used as the interface. Participants are informed about the relevant trade-offs on the map and use this information to change the land use maps. The approach is tested during a negotiation session as part of the land use planning process of the Bodegraven polder, a peat meadow area in the Netherlands.     

Mixing Methods and Triangulating Results to Study the Influence of Panning on Map Users’ Attentive Behaviour

The general aim of this paper is to evaluate the influence of panning on the map user’s (attentive) behaviour, using a mixed methods approach. A user study was conducted in which participants – with an expertise in cartography – had to execute four tasks in Google Maps, using only a panning operation. During the first two tasks, participants had to follow a predefined route; during the latter two tasks they had to locate Belgium on a less detailed scale level. A strong task-related interactive behaviour was revealed by the participants’ mouse action and eye movements. Furthermore, the attentive behaviour was influenced by the type of view (map or satellite) and whether it occurs while performing the panning operation. The georeferenced eye movements were imported in a GIS for spatial analysis. Based on these spatial queries, we discovered that the duration of the fixations was associated by their location on the map.     

短临交互预报系统VIPS设计开发与应用

介绍了短时临近交互预报系统VIPS(Very-short-range Interactive Prediction System)的设计理念、开发思路及其功能实现。该系统设计基于开放理念,采用Java语言及开源软件,可跨平台运行,便于系统的开发及升级维护。以开源地理信息软件OpenMap为核心,将丰富的实况探测资料(如区域雷达资料、自动站资料、闪电定位资料)、雷达外推预报和风暴追踪产品及0～6小时数值预报产品与精细的地理信息以图层形式进行叠加,可对风暴的发生、发展在短时临近时间段内进行综合分析。基于对短时临近预报相关实况探测资料及短时临近预报产品的综合分析,可实现预警产品的人机交互快速编辑、制作精细化的预警产品并快速分发,满足了北京奥运会气象预警制作发布及现场服务等需求。     

一种交互式多目标决策方法及其应用

针对水资源系统优化规划的特点,提出了一种交互式多目标决策方法,给出了该方法的理论依据。实例表明,该方法能求解广义的多目标决策模型,提供给决策者的交互信息较丰富,求解简便,能高效地寻求非劣的满意解。     

Frontiers in Seafloor Mapping and Visualization

Over the past few years there have been remarkable and concomitant advances in sonar technology, positioning capabilities, and computer processing power that have revolutionized the mapping, imaging and exploration of the seafloor. Future developments must involve all aspects of the “seafloor mapping system,” including, sonars, ancillary sensors (motion sensors, positioning systems, and sound speed sensors), platforms upon which they are mounted, and the products that are produced. Current trends in sonar development involve the use of innovative new transducer materials and the application of sophisticated processing techniques including focusing algorithms that dynamically compensate for the curvature of the wavefront in the nearfield and thus allow narrower beam widths (higher lateral resolution) at close ranges . Future developments will involve “hybrid”, phase-comparison/beam-forming sonars, the development of broad-band “chirp” multibeam sonars, and perhaps synthetic aperture multibeam sonars. The inability to monitor the fine-scale spatial and temporal variability of the sound speed structure of the water column is often a limiting factor in the production of accurate maps of the seafloor; improvements in this area will involve continuous monitoring devices as well as improved ocean models and perhaps tomography. Remotely Operated Vehicles (ROV’s) and particularly Autonomous Underwater Vehicles (AUV’s) will become more important as platforms for seafloor mapping systems. There will also be great changes in the products produced from seafloor mapping and the processing necessary to create them. New processing algorithms are being developed that take advantage of the density of multibeam sonar data and use statistically robust techniques to “clean” massive data sets very rapidly. A range of approaches are being explored to use multibeam sonar bathymetry and imagery to extract quantitative information about seafloor properties, including those relevant to fisheries habitat. The density of these data also enable the use of interactive 3-D visualization and exploration tools specifically designed to facilitate the interpretation and analysis of very large, complex, multi-component spatial data sets. If properly georeferenced and treated, these complex data sets can be presented in a natural and intuitive manner that allows the simple integration and fusion of multiple components without compromise to the quantitative aspects of the data and opens up new worlds of interactive exploration to a multitude of users.     

筏板基础与地基的共同作用计算分析——以北京市中关村航空科技园配套工程为例

在高层建筑地基、基础和上部结构三者相互作用的过程中,地基起主导作用,其次是基础,另外还受到上部结构刚度的约束作用。本文以筏板基础为例,介绍一种有限单元方法,把地基按分层变化的有限压缩层模式,将基础与地基视为两种不同的弹性体,在同时满足静力平衡和变形连续的条件下,引入上部结构在底层柱脚处对基础的约束作用,同时求得地基反力和基础内力,最后以一具体实例来论证之。     

二维CSAMT三角剖分人机交互解释程序的实现

二维ＣＳＡＭＴ人机交互解释程序,以往都是针对规则模型（如矩形）来实现的。本文主要介绍二维ＣＳＡＭＴ三角剖分的人机交互解释程序的实现过程：程序实现的软硬件环境、总体设计框图、运算使用的参数以及程序运行操作方法。     

虚拟森林场景的构建

解决了构建符合林分结构规律的虚拟森林场景的两个关键问题：①森林空间数据的分析与仿真，主要研究林分中树木各特征因子如树高、胸径在林分空间位置上的分布状况；②在森林空间数据给定的情况下，采用交互式参数建模方法构建三维几何树模型，最后阐述了虚拟森林场景构建的具体流程。