共查询到20条相似文献，搜索用时 109 毫秒
1.
专题地图中的色彩研究 总被引：2，自引：0，他引：2
《江西测绘》2007,(Z1)
从色彩的三要素即色相、亮度、纯度入手,结合实际工作经验,对专题图设色进行分析和总结,提出一些普适性的设色方法以及专题图设色应注意的一些问题。 相似文献
2.
《测绘科学技术学报》2013,(5)
直升机低空航线的选择是保障飞行安全、充分发挥直升机的战术性能的关键。本文通过对直升机低空航线选取过程中应考虑的影响因素的分析,提出了一种基于栅格数据的空间模糊综合评判方法,对影响直升机飞行安全的近地地形环境进行针对性分析。最后,在数字地形图、栅格图的基础上,给出了直升机低空航线辅助选择模型的具体实施步骤以及最终结果。 相似文献
3.
4.
5.
晕渲图的设计与制作一直是地学工作者研究的热点问题,使用晕渲图展示地形直观、形象、立体感强.目前有多种思路被提出用于改善晕渲图的显示效果,但是在制作小比例尺晕渲图时,仍然存在一些问题,如地形破碎导致难以把握地形宏观骨架,缺少海洋地形或海洋地形过于具体干扰到陆地要素表达,传统的DEM与山影数据叠加的模式使得美观与地形清晰无法兼得,这就需要重新对这些问题进行思考.本文以晕渲图的基本理论为出发点,采用地貌晕渲与分层设色相结合的方法,讨论全球范围的晕渲图制作过程中,不同显示比例尺下DEM分辨率配置技巧、海洋地形展示方法与地形可视化新思路.实验证明,该方法可以保证晕渲图在每级显示比例尺下都能展示出良好的地形效果,为中小比例尺晕渲图增强表现力提供了参考. 相似文献
6.
7.
在对传统的分层设色晕渲理论应用于城区DSM的可视化技术进行充分研究的基础上,提出了一种基于高程直方图的自适应高程分级方法。该方法通过高程直方图研究城区地形、地物的高程分布及变化特征,自适应建立高程带分级模型。实验表明,提出的晕渲图制作方法兼顾了地貌形态和地物特征的表达,成果色彩过渡自然,层次清晰,地形、地物区分明显,有较强的艺术性和实用价值。 相似文献
8.
全球海量地形数据组织管理方法的研究 总被引：2，自引：1，他引：1
本文通过研究全球多分辨率地形数据的特点和渲染需要,研究了现有的全球地形数据组织方法并提出改进措施。然后利用多分辨率LOD(MRLOD)技术,设计并实现了一种面向全球的分层分块方案,详细阐述了其构建规则,并分析了方案的可行性,然后详细地说明了分层分块的数据结构组织,最后利用上述提出的技术,做了一些关于某一大规模三维地形实时漫游方面的实验,文中详细列出了这些实验结果。实验结果表明,采用该文提出的方法,可以在普通PC机上实现大规模三维地形场景的实时漫游。 相似文献
9.
10.
县（市）分层设色地图是省（区）普通地图集的主体，其设色效果的好坏，对图集的印制质量具有较大的影响。现根据我们印制省地图集的实践，谈谈县（市）分层设色地图的印刷工艺设计，包括：1．县（市）分层设色地图的制版工艺；2．县（市）分层设色地图的彩色设计。3．县（市）分层设色地图的边打样边印刷。 相似文献
11.
湖南省地势图编制关键技术研究 总被引：1，自引：0，他引：1
地势图是一种着重表示地势起伏、植被分布、水系特征与分布规律的专题地图,强调表现地面的高低起伏、倾斜程度及与其他地理要素的对比关系,以及水系的分布特征和形态特征,并适当表示其地表的植被与土质。本文以湖南省为例,在基于DEM数据上,收集研究区域的资料并进行分析,采用分层设色法表示地势图,关键技术在于如何确定设色原则和建立色层表。 相似文献
12.
13.
14.
Vipin Joseph Markose 《国际地球制图》2013,28(7):553-568
Hypsometric analysis is useful for understanding the geomorphic stages of a river basin. Hypsometric parameters have been evaluated and curves are prepared forall the 20 sub-basins of Kali River. Thirteen sub-basins are found to be under younger geomorphic stages with high hypsometric integral (Ea) values and subjected to recent tectonic activities. The remaining seven sub-basins are approaching mature stage and subjected to more erosion and less impacted by recent tectonic activities. Six sub-basins with lower hypsometric head values (<0.56) indicate least effect of diffusive processes and another six sub-basins with medium hypsometric head values (0.60–0.68) depict moderate diffusive erosion. The remaining eight sub-basins with higher hypsometric head values (>0.75) indicate highest diffusive processes at their upper reaches. Lower (<0.28) and higher (>0.44) hypsometric toe values indicate minimum and maximum mass accumulation respectively at the sub-catchment mouth. 相似文献
15.
This paper reports the results of an exercise on the development and application of a rule-based software program,Combine for integration of thematic information in simplest possible way. The program was used for forest land use planning in a shifting cultivation area in north-east India. The program can integrate 28 thematic information layers with upto 256 classes in each layer using 8-bit data. Additionally the software can be used for many per pixel image processing operations like merging of digitally and visually classified images, merging of a large number of thematic classes into a few wanted ones, density slicing, image thresholding etc. conveniently. 相似文献
16.
17.
K. S. Lazarevich 《地理信息系统科学与遥感》2013,50(2):163-171
In a critique of maps used for geomorphological research (too cluttered to be read effectively, too general in respect to contour positioning), the author describes: (a) a methodology whereby conventional hypsometric maps can be corrected through the use of air photos, (b) outlines principles for symbol generalization and selection whereby the amount of geomorphological information perceived on hypsometric maps is increased, and (c) recommends the joint use of hypsometric, topographic photo-, and general geomorphological maps as the most effective means of terrain analysis. Translated by Larry Richardson, Glendale, CA 91202 from: Geomorfologiya, 1991, No. 2, pp. 38–45. 相似文献
18.
Tejpal Singh 《国际地球制图》2013,28(6):417-427
Hypsometric analysis describes the elevation distribution across an area of land surface. It is an important tool to assess and compare the geomorphic evolution of various landforms irrespective of the factor that may be responsible for it. The major factors governing the evolution of landscape are tectonics and/or climate and the variation in lithology. The present study takes into consideration the watersheds developed over actively deforming Mohand anticlinal ridge in the frontal part of NW Himalaya. The hypsometric analysis has been used as a morphometric parameter, i.e. hypsometric integral, to deduce its relationship with the area of watersheds. Statistical analysis of these parameters has been carried out by classifying them into different classes based on the natural breaks method. This brings out strong relationships for hypsometric integral classes and area classes with the number of watersheds in respective classes and the total area occupied by respective hypsometric and area classes. It has also been found that stronger relationships exist for watersheds on the southern flank as compared to watersheds of the northern flank. It also highlights the presence of an anomalous watershed on the northern flank that is possibly responsible for the weak statistical relationships on the northern flank. Removal of this anomalous watershed always brings out much stronger relationships for the northern flank. The anomalous watershed has been directly attributed to the difference in geologic structure as it is spatially related to the presence of the Bhimgoda Back Thrust (BBT) present in the area. The results are awe inspiring and very promising as they indicate some statistically strong relationships among the hypsometric integral and area of watersheds that are not apparent in the spatial distribution of these parameters, especially in actively deforming areas. 相似文献
19.
何春秀 《测绘与空间地理信息》2021,44(1):207-209
随着互联网信息技术的飞速发展,电子化地图得到了广泛应用,高德地图、百度地图等互联网地图广泛应用于我们日常生活中,地图的美观性和设计感就决定了人们对它的第一印象。专题图作为一种集设计理念、空间信息于一体的地图产品,在很多场合中发挥着越来越大的作用。在制作专题地图中常常使用到的软件工具有ArcMap、CorelDRAW、Adobe Illustrator等,本文基于ArcMap进行专题图地图符号的设计,利用ArcMap专业地理信息的特性和强大的符号管理工具,对地图符号设计进行深入研究探索,发掘ArcMap对专题地图符号设计的潜力。 相似文献
20.
为提高无人机对地定位精度，必须对系统进行几何标定与补偿。首先进行了直接地理定位实验，检验系统在不经过任何标定时的直接地理定位精度；然后进行了自由网光束法平差实验，以验证无地面控制点时系统的定位精度；最后进行了POS辅助自检校光束法平差，对内方位元素变化、相机畸变、IMU安置角进行标定和补偿，并验证了系统误差补偿后的直接地理定位精度。实验结果表明，未经几何标定的无人直升机直接地理定位的精度可满足应急条件下测绘保障要求；少量地面控制点的辅助下定位精度远优于1:500比例尺地形图测图的要求，可用于常规测绘生产；系统误差补偿后，直接地理定位精度有明显提升:平面精度提高46.37%，高程精度提高62.49%；系统误差标定和补偿方法正确、有效，无人直升机具有很好的测绘应用前景。 相似文献