共查询到19条相似文献，搜索用时 390 毫秒
1.
互联网的广泛应用产生了越来越多与地理空间位置关联的文本信息。现有地理信息系统一般通过外部链接来浏览这些数据,需要频繁的缩放、漫游和点击操作,而其他方法又难以有效表达出空间位置关系。提出了一种基于标签云的位置关联文本信息可视化方法———标签云地图,给出了标签云地图的设计思路和实现流程,并以腾讯微博的真实数据集为例建立了原型,重点研究了点状和面状地理要素的Cartogram生成算法,关键字和词频的提取算法,面向不同尺度和不同时间的标签云显示规则的标签位置生成算法。实验表明,该方法能够帮助用户从大量的位置关联文本信息中快速感知并把握信息的总体特征和发展趋势。 相似文献
2.
针对传统的民族人口分布专题图的表示方法往往不能同时兼顾人口规模和分布位置两类信息的表达的问题,该文基于标签云技术,提出一种面向民族人口分布专题信息表达的标签云布局方法。通过标签的构型和尺寸分别表示民族人口的类型和数量特征,并对标签的位置设置地理特征关联和制图空间约束,实现顾及空间分布特征的标签云布局。该文以云南省民族人口分布标签云地图为案例,验证了标签云布局算法的可行性,并对生成结果进行了测评。实验表明,采用标签云方法可获得更加直观的可视化效果,便于读者快速获取民族人口分布信息。该文提出的标签云布局方法可以有效地生成民族人口分布标签云专题图,算法执行效率较高。 相似文献
3.
在标签地图应用日益增加的背景下,亟需开展标签权重表达策略的评估研究。引入眼动跟踪方法,针对常用于标签地图权重表达的一种等差字大策略进行评估。实验设定无目的自由浏览和有目的阅读分析两个应用场景,布置标签选取、识别/搜索、记忆和主观评价任务,统计分析被试完成以上任务的眼动数据和其他衍生数据,结果显示:（1）不同大小的标签在信息凸显性、视觉吸引力、权重记忆以及识别/搜索时的搜索效率、阅读效率和认知负担方面并未表现出明显差异性;（2）文字大小处于上游的标签相比处于下游的标签更加容易被识别/搜索,被试的兴趣度更高,但并不意味着文字越大的标签越容易被识别/搜索,被试的兴趣度越高;（3）采用等差字大策略的标签地图总体评价良好。该研究有助于地图设计者进一步了解等差字大策略的特点。 相似文献
4.
5.
6.
在现代到后现代社会的转变过程中, 人类的信息传播模式进入自媒体时代, 在地图上表现为制图用户向大众或地图爱好者转移, 地图的精确性不高、表达方式多样化。微地图是其中的一种, 旨在改善传统地图表达和大众地理空间认知的矛盾, 改进自媒体时代地图用户的主观信息表达, 突破传统地图仅从有限、规范化的角度和维度对地理事物和现象进行表达的局限。首先, 针对微地图的3个特点, 在后现代哲学的视角下分析其产生的原因并给予解释; 然后, 利用认知语言学的体验人本观、原型范畴论和去中心论等后现代哲学方法论, 对传统地图的空间认知、信息分类、制图表达等基础问题进行批判性分析和重构, 形成具有后现代哲学特点的微地图概念框架;最后, 通过实验验证了微地图存在的可能性及其后现代属性。 相似文献
7.
传媒技术革命新阶段为地图传播领域带来新机遇,促使传统定向的“媒介-受众”关系转向多元共竞的“新媒介-用户”关系。在此背景下,将新闻传播学的数据新闻概念引入地图学中,对比分析新媒体地图与纸媒地图、电子地图之间的关联与差异,总结得到新媒体地图的三大特性,并以八二四研究所公众号为具体案例,研究地图在新媒体运营中的作用,提出消减犹豫区、增强即时体验、构造交流空间3种优化地图表达策略的可行性方法,旨在为其他新媒体地图设计提供实践参考。 相似文献
8.
9.
本文从地图制图专业视角出发,归纳互联网地图制图体系的要素及其关系,分析目前地图视觉质量仍待优化的必要性,并揭示现状问题的成因。进而结合互联网地图的特点、媒介环境和技术条件、受众认知与交互需求等,提出影响互联网地图视觉质量的用户考量、研究倾向、参与协同和介质技术等四大因素。由此,强调美学属性是地图必要的有机组分,网络地图服务的功能体验、交互体验、视觉体验相辅相成。最后,基于以用户为中心和跨学科协同的理念,回答了制图实践的方向性问题,从宏观指导、具体原则和实施细节三个层面,探讨了互联网地图视觉质量控制和优化设计的对策建议。 相似文献
10.
11.
With the widespread use of tag clouds, multiple map-based variations have been proposed. Like standard tag clouds (also called word clouds), these ‘tag maps’ all share the basic strategy of displaying words within a ‘geographic space’ and scaling the word size to depict frequency (or importance) of those words within some dataset. While some tag maps simply plot a standard tag cloud on top of a map, the subset of tag maps we focus on here are those in which the collection of words are displayed within bounded geographic regions (often of irregular shape) that the words are relevant for. For this form of tag map, map scale and polygon shape add constraints to word size and position that have not been considered in most prior approaches to tag map word layout. In this paper, we present a layout strategy for tag map generation that includes consideration of the shape and size of the geographical regions acting as containers for the tags. The method introduced here uses a triangulated irregular network (TIN) to subdivide the geographical region into many triangle subareas, with the centroid of each triangle being a potential location to centre a tag on. All the triangles are sorted by their area and all the tags are sorted by their weight value (e.g. frequency, importance or popularity). Positioning of tags is undertaken sequentially from most important (or frequent or popular) with potential locations being the TIN triangle centroids (tried from largest to smallest triangle). After each tag placement, the TIN is recalculated to integrate the tag centroid and bounding corners into the TIN creation. The limited whitespace in the geographical region, at any specific scale, is used fully by dynamically adjusting the font size along with the number and the direction of tags. The method can be applied to add tags within geographic polygons that are convex, concave and other more complex regions containing holes or islands. 相似文献
12.
13.
Online Survey of Heterogeneous Users and Their Usage of the Interactive Mapping Platform WorldMap 总被引：1，自引：0，他引：1
This article reports on the results of an online survey with 290 heterogeneous users of the interactive mapping platform WorldMap and provides insights into problems faced by such users. Heterogeneous users are users with a variety of GIS skills, educational background, gender, and age categories. We investigate how they interact with online maps and analyse their experience. WorldMap represents as a case study of an online mapping platform which aims to serve researchers and users across disciplines in viewing and creating online interactive maps. We concentrate on operations that are perceived as difficult and very difficult by the majority of users as well as operations that are rarely used. Our aim is to contribute to the discussions on how to improve the design of online GIS-based mapping platforms. We conclude the paper with reflections on the results of our study and ideas for further research. 相似文献
14.
Maps are good at representing geographic space, but texts have a stronger affordance of telling a story than maps. Telling stories is, however, important to make information more personal and to arrest the map user's attention. This paper contrasts the map and the text media in order to understand why texts are good at telling a story but conventional maps are not. We demonstrate that, by a modification of maps, appropriate structural features of the text media can be transferred to maps, which makes them more suitable for telling stories. This new concept for map design can lead to new interaction possibilities and provide insights into how maps can be used more effectively. 相似文献
15.
地图数字注记识别的神经网络方法 总被引：1，自引：0，他引：1
讨论了基于径向基函数网络（RBFN）的地图数字注记识别问题。在分析了网络结构和训练算法的基础上,用地回扫描数据进行了识别实验。结果表明,本文提出的方法用于地图数字注记识别是非常有效的。 相似文献
16.
道路信息提取方法综述 总被引：2，自引：1，他引：1
道路信息提取旨在使用相关数据和方法提取一条道路上的信息,如车道数量、中心线和边界线等。道路信息提取在交通规划和车辆导航等方面具有重要的应用价值。随着各种传感器设备的广泛应用,交通数据爆炸式增长,道路信息提取的方法也日新月异。本文结合近年来道路信息提取的研究进展,将道路信息提取方法按照数据来源分为基于影像视频数据、基于高密度点云数据和基于浮动车轨迹数据3类,并分别深入论述了这3类方法的主要实现算法,对这些算法模型进行了对比分析,最后探讨了现有道路信息提取方法在未来的研究趋势和面临的挑战。 相似文献
17.
E‐mobility has been gaining importance in recent years in Germany, with the National Platform for E‐mobility infrastructure in Germany is expected to change fast, therefore many charging stations will appear. These need to be managed, and the aim of this work is to explore how web applications could best support productivity and user experience in this context. We compared a text‐form‐based approach to a map‐based approach for the addition and update of locations and chargepoints. We found that the map‐based approach yields better learning effects and offers a better compromise between pragmatic and hedonic properties. The results are useful for a better understanding of the impact of interactive maps on work and user experience in the e‐mobility domain and beyond. 相似文献
18.
介绍了一种基于区域生长的体素滤波点云去噪算法。首先,使用体素滤波算法将点云数据体素化后,根据每个网格与最大密度网格的比值大小,将网格分为两类:大密度网格、小密度网格。然后对大密度网格使用区域生长法处理。最后,对全部数据进行区域生长处理。实验结果表明,该方法能够消除大、小尺度噪声,并且能够消除簇状噪声,且不改变点云的纹理信息。 相似文献
19.
针对灰度直方图在影像分类时需要考虑阈值和K-最近邻分类算法分类效率低等问题,提出了一种基于灰度直方图与KNN相结合的影像分割算法:首先对待分割的影像进行灰度直方图统计;其次利用灰度直方图对影像进行硬阈值的划分,得到已知类别样本和未标记样本;然后选择一定数量已知类别的样本对KNN分类器进行训练;最后利用KNN分类器对未标记样本进行类别划分,得到最终分割图像。实验结果表明,该算法结合了灰度直方图高效性和KNN高精度的优势,避免了直方图分割最佳阈值的选取;与传统的KNN算法相比,本文算法大大提高了分类效率,且精度相当,满足实际生产应用的需求。 相似文献