自组织特征映射神经网络及其在彩色地图自动分层中的应用     

林宗坚  刘少创 《武汉大学学报(信息科学版)》1994,(2)

地图数据分层是地图识别系统的一个重要组成部分。由于传统的基于Ｂａｙｅｓ准则识别方法要求已知概率分布密度，当实际概率分布与假设条件存在差异时，无法取得满意的识别效果。神经网络方法可以克服这些缺点。本文利用Ｋｏｈｏｎｅｎ提出的自组织特征映射网络的学习、识别能力，实现了对彩色地图扫描数据的自动分层。  相似文献   

陕西秦巴地球化学环境雏议     

杨玉杰 《陕西地质》1994,(1)

本文从地球化学环境与人类生存关系出发，依据区域化探水系沉积物资料编制环境地球化学图。通过对元素区域背景特征的分析及对所圈定的特殊环境区的雏议，提出本区原生地球化学环境质量既正常又欠佳的结论，进而建议充分利用本区高硼量的自然环境发展果林业，同时加强环保措施，预防地方病及矿区污染的进一步扩大。本文附图是我省第一份环境地球化学图，这一基础地球化学资料，对进一步研究本区原生自然环境质量及对环保、农林牧业等方面具有一定的参考价值。  相似文献   

地图学面临的挑战与机遇   总被引：12，自引：3，他引：12  

陈述彭 《地理学报》1994,49(1):1-8

市场经济的信号，揭示地图生产亟须从概念设计乃至工艺程序进行根本性的技术改革，需要大力缩短地图更新周期，积极开拓应用领域，才能为区域社会经济持续发展和全球环境变化──当代两大地学研究主题，及时提供信息服务。需要充分利用和适应空间时代和信息时代的机遇，加强对地球信息机理的研究，开发依托全球定位系统、卫星遥感信息系统与地理信息系统的新一代地图产品。  相似文献   

Regression models for estimating mineral resources from geological map data   总被引：9，自引：0，他引：9  

C. F. Chung  F. P. Agterberg 《Mathematical Geology》1980,12(5):473-488

  相似文献   

无人机航测技术在风电场测图中的应用     

黄小兵 《北京测绘》2020,(5):700-704

本文提出了一种利用无人机航空摄影测量技术完成风电场测图的方法,利用该方法可以实现测区1∶2000地形图数据的生产。首先根据航摄区域和航线规划布设控制点、像控点、检查点,利用飞马F300无人机进行航摄作业获取航测数据,然后对数据进行预处理,按照标准格式导入Context Capture软件建立三维倾斜模型,通过EPS2016立体量测软件基于三维倾斜模型完成地形图数据的采集,对于模型变形的区域,利用MapMatrix软件进行数据采集与校核。利用安徽宿州风电场测图项目验证了该方法满足1∶2000大比例尺地形图精度要求。  相似文献   

松嫩盆地地下水水质评价图的编图原则与方法   总被引：5，自引：0，他引：5  

廖资生  林学钰  杜新强 《地球科学进展》2003,18(2):299-304

以我国现行的《地下水质量标准（GB／T14848-93）》为主要依据,结合松嫩盆地地下水化学组分和水质与地方性疾病密切相关的特殊情况,对《地下水质量标准》进行了必要的补充和修订,采用国标推荐的方法与模糊综合评判方法,对整个盆地的地下水质量等级进行了评价,并在此基础上编制了《松嫩盆地地下水水质评价图》,该图由《地下水水质级别分区图》（主图）、《主要开采含水层天然有害组分浓度分布图》和《地下水人为污染有害组分超标范围图》（辅助图）、《水质动态曲线图》三部分组成,该图在内容上突出反映了主要开采含水层的地下水质量状况、不同级别水质和地下水有害组分的时空分布规律。  相似文献   

Interactive generalization on large-scale topographical map supported by a database platform     

CAIZhongliang WUHehai DUQingyun LIAOChujiang 《地球空间信息科学学报》2003,6(4):17-26

This paper makes a study on the interactive digital generalization, where map generalization can be divided into intellective reasoning procedure and operational procedure, which are done by human and computer, respectively. And an interactive map generalization environment for large scale topographic map is then designed and realized. This research focuses on: ① the significance of researching an interactive map generalization environment,② the features of large scale topographic map and interactive map generalization, ③ the construction of map generalization-oriented database platform.  相似文献   

Subdivision of polygon parcel in land-use data generalization     

AITinghua 《地球空间信息科学学报》2003,6(3):56-61

In land-use data general-ization, the removal of insignificant parcel with small size is the most fre-quently used operator. Traditionally for the generalization method, the small parcel is assigned completely to one of its neighbors. This study tries to improve the generalization by sepa-rating the insignificant parcel into parts around the weighted skeleton and assigning these parts to different neighbors. The distribution of the weighted skeleton depends on the com-patibility between the removed object and its neighbor, which considers not only topological relationship but also distance relationship and semantic sim-ilarity. This process is based on the Delaunay triangulation model. This paper gives the detailed geometric al-gorithms for this operation.  相似文献   

Soil morphological variations on the Taoyuan Terrace, Northwestern Taiwan: Roles of topography and groundwater     

Yu-Shih Lin  Yue-Gau Chen  Zueng-Sang Chen  Meng-Long Hsieh 《Geomorphology》2005,69(1-4):138-151

To understand whether soils on the same geomorphic surface have similar properties, this study examines the morphology of soils developed on the 30-kyr-old Taoyuan Terrace, Northwestern Taiwan. Relationships among soil morphology, variations in the groundwater table, and soil forming processes were established based on field investigations and previously published datasets. The soil series in the study area can be grouped into seven types, including three homogeneous groups, two mottled groups, one gley group, and one reworked group. Fifteen hand-core samples collected in the field and borehole data were used to understand spatial variations in soil morphology. The results indicate that soil morphology on the southern Taoyuan Terrace changes systematically from the fore-edge to the back-edge: from red/orange soils to yellow soils, then to mottled soils, and finally to gley soils. The borehole data indicate that the groundwater table is generally parallel to the ground surface but drops significantly near the terrace fore-edge. This pattern matches with the observed soil toposequence, indicating that the pedogenic processes in the study area are mainly controlled by groundwater distribution determined by topography. Although soils on the terrace fore-edge have developed under the well-drained conditions that favor lateritization, at least two distinct soil types (i.e., red and orange) can be observed there, reflecting different geomorphological settings in a paleo-fluvial landscape. This work suggests that geomorphological and hydrological conditions should be examined carefully before using soil morphology for correlating geomorphic surfaces.  相似文献   

RDINFO中开放式空问参照系统的设计与实现   总被引：1，自引：0，他引：1  

梅新崔伟宏  黄全义 《测绘信息与工程》2004,29(2):7-9

介绍了基础地理信息平台软件RDINFO的开放式空间参照系统的设计思想 ,分析了其总体结构 ,提出了其实现方法  相似文献