海洋岛屿制图综合原则的改进与实践     

李宏  金玉平  甄旭朝 《地理空间信息》2010,8(6):121-122,125

就海洋岛屿在地图上如何进行综合,尤其是岛屿岸线的概括和一直没有在地图上得到表示的潮差部分的地貌应如何表示,结合生产实践,给出了可以参考的方法。  相似文献   

地图学课程内容的安排和方法的探讨     

胡圣武 《地理空间信息》2007,5(6):115-118

论述了《地图学》对培养、提高GIS专业学生素质和创新能力的重要作用;讨论了《地图学》与GIS的关系;结合GIS专业的特点对《地图学》的授课内容和实习内容的安排进行了研究;对《地图学》的教学方法进行了探讨。  相似文献   

基于AO的水系自动制图综合应用研究     

黄丽娜  何津  费立凡 《地理空间信息》2007,5(4):112-114

ArcObjects(AO)二次开发组件具有强大的图形分析和处理功能。本文通过设计树状水系的数据组织、河流选取和概括方案,探讨了使用AO组件对象接口实现树状水系的自动制图综合方法,并提出了Douglas-Peucker算法的改进。  相似文献   

地质约束条件下的地质体智能综合方法研究     

徐可  王永志  陈圆圆  陈堂雷  蒋作瑞 《地质力学学报》2021,27(3):365-373

地质体综合是地质图编制工作的重中之重,因其处理涉及内容多、 业务逻辑复杂、 重复工作量大,是影响编图工作推进的主要因素.为了能够实现地质体的高效综合,文章提出了一种以地质约束条件(专家知识)为核心、 以制图综合为空间图形合并手段的新型地质体智能综合方法,设计并实现了围绕地质专家知识(如地质年代、 地层名称等)规则映射开...  相似文献   

The need for disciplinarity,interdisciplinarity and scientific societies-the cartographic perspective     

Jochen Schiewe 《地球空间信息科学学报》2021,24(1):160-166

Do we still need Cartography?Do we still need a cartographic society?These questions,which can also be transferred to other disciplines,are answered from discip...  相似文献   

浅谈ArcMap在1:10000地形图制图中的应用     

白丹 《测绘与空间地理信息》2019,42(5):76-77

GIS的广泛应用加速了地图制图产业的发展,本文以ArcMap为平台,以基础地理建库数据为数据源,结合参与的工程项目,阐述了ArcMap在1:10 000地形图制图应用方面的方法和技巧,希望能给基层的作业人员提供一定的参考。  相似文献   

Smart Cartographic Background Symbolization for Map Mashups in Geoportals: A Proof of Concept by Example of Landuse Representation     

Nadia H. Panchaud  Lorenz Hurni 《The Cartographic journal》2019,56(1):42-58

Geospatial data are now widely available to the general public thanks to geoportals and online mapping platforms. However, creating a map involves more than just combining data layers. Thus we develop cartographic functions for geoportals to support better visual hierarchy in user map mashups. This includes a couple of preparatory steps followed by a smart cartographic background symbolization derived from the original layer style. We evaluate different approaches to background symbolization: greyscale, desaturation, and smart background. The different background symbolization methods are analysed with two concrete map examples and evaluated with a survey. The smart background symbolization developed in this work improves the visual hierarchy of the map mashup by reducing the visual importance of the background layers.  相似文献   

Effectiveness of Dynamic Point Symbols in Quantitative Mapping     

Paweł Cybulski  Łukasz Wielebski 《The Cartographic journal》2019,56(2):146-160

The main focus of this paper is the effectiveness of dynamic point symbols in the presentation of quantitative data. Such symbols are of particular use in the design of animated maps and computer games. The authors examine three existing techniques of using dynamic point symbols to present quantitative data: blinking, pulsation, and rotation. The aim of the study is to compare their effectiveness with that of classical cartographic animation techniques. The results of the study show that in animated map design, dynamic point symbols might be used to present not only qualitative but also quantitative data with comparable effectiveness. The results may serve as the basis for designing dynamic point symbols to be as effective as the classical techniques used in animated cartography.  相似文献   

An integrated framework for linear pattern extraction in the building group generalization process     

Parastoo Pilehforooshha 《国际地球制图》2019,34(9):1000-1021

Building pattern extraction is an essential step in building generalization. Although many studies have already been conducted, there is a lack of a framework for extracting building patterns. To overcome this problem, an integrated framework for extracting building linear patterns is presented. First, an aggregation function is presented based on the TOPSIS method, which determines the similarity index in terms of area, shape, rectangularity and distance similarities. This results in the extraction of straight and perpendicular patterns using the similarity index and orientation difference criteria. Second, a refinement strategy is proposed, which refines the extracted patterns using a novel definition of the pattern interaction index. To evaluate the proposed model, the complete building group generalization process is implemented using a data-set at 1:25 k scale. The evaluation results allowed us to conclude that the proposed model produces meaningful results, and therefore it would be beneficial in the generalization process.  相似文献   

基于多种机器学习模型的西北地区蒸散发模拟与趋势分析          下载免费PDF全文

季鹏  袁星 《大气科学学报》2023,46(1):69-81

基于机器学习方法和多源数据构建高精度蒸散发（Evapotranspiration,ET）产品对研究气候变化背景下干旱、半干旱地区陆地水循环变化具有重要意义。本文利用西北地区12个草地通量站点与卫星遥感产品,基于随机森林、极端梯度提升、支持向量回归和人工神经网络4种机器学习方法构建ET估算模型,制作5 km分辨率ET产品,并分析ET的长期变化趋势。交叉验证结果表明,4种模型的均方根误差都低于0.57 mm·d^-1,R²高达0.73～0.88。SHAP （SHapley Additive exPlanation）可解释性分析表明,4种模型均将净辐射、植被和土壤湿度作为ET估算的重要因子,也能刻画出土壤偏干时土壤水分对ET的限制作用,有较好的物理解释性。多模型集合的ET结果相比单一机器学习模型以及现有遥感产品误差分别降低7％～20％和45％～70％。趋势分析结果显示,西北地区非裸地下垫面在2001—2018年间整体呈现ET增加趋势,平均速率为19 mm/（10 a）。在河套平原和内蒙古中部和东北部地区,ET的增长速率超过降水,这可能会进一步加剧这些地区的干旱化。  相似文献