地理图斑智能计算及模式挖掘方法研究     

骆剑承  吴田军  吴志峰  周亚男  郜丽静  孙营伟  吴炜  杨颖频  胡晓东  张新  沈占锋 《地球信息科学学报》2020,22(1):57-75

在大数据时代,高分辨率对地观测技术实现了对地球表层地理现象和地理过程最为真实、量化、全面覆盖又快速更新的数据化记录,可为地理空间认知研究的新发展奠定时空信息聚合与挖掘计算的基准。地理图斑是影像空间映射到地理空间中对于地理实体的抽象化表达,是构建地理场景和承载地理空间各类信息进而开展模式挖掘的最小单元。本文以地理图斑为基本对象,通过分析其中视觉模拟、符号推测等几类机器学习的协同计算机制,从空间、时间与属性等维度构建了集“分区分层感知”、“时空协同反演”、“多粒度决策”三者于一体的地理图斑智能计算模型,并以在贵州息烽县、广西江州区开展的农业种植结构制图与规划决策为应用案例,探索了地理图斑分布、生长以及功能3种模式的挖掘方法,并进一步设计了动态视角下开展图斑动力模式挖掘的研究思路。  相似文献   

城市用地功能精细化识别方法：时序动态图嵌入深度学习模型     

高原  王洁  李钢  颜建强 《地球信息科学学报》2022,24(10):1968-1981

多源大数据融合背景下的城市功能区识别是复杂非线性系统的模式识别问题,如何有效地从大规模的轨迹数据中提取出多粒度连续性时变和多尺度空间相互作用的信息是进行城市区域功能识别的关键。本研究设计实现了一种基于时序动态图嵌入的深度学习模型,在融合滴滴出行及兴趣点数据（Point of Interest, POI）基础上,提取城市区域存在的时间和空间上的隐式特征,结合聚类分析实现城市用地功能的语义识别。结果表明,成都市中心的用地功能趋向复合多样化的发展,且用地属性随时间发生作用范围和用地类型的变化,呈现出功能随着城市群体活动而变化的时空规律。与相关文献的对比实验表明,本文提出方法在更细粒度的时间段下进行功能区识别,得到的同一类功能区域内集聚度更高,能够更好的捕获复合型区域在不同时间模式下呈现出的用地功能变化。本研究为城市用地功能识别研究提供了新的技术方法,为城市规划研究人员全面理解城区结构属性提供了有效手段,对推动城市空间得到更合理高效的利用具有一定的价值。  相似文献   

无人机航空像片绝对定向非迭代解算方法研究     

程超  段连飞  李金  顾强 《海洋测绘》2008,28(5):49-52

利用无人机航空像片的模型点重心化坐标和地面重心化坐标构成单位四元数，通过最优化求解绝对定向旋转矩阵，并基于旋转矩阵解算平移参数和比例参数，实现绝对定向的非迭代解算。与传统方法相比，这种方法具有无需初始值、可靠性高等优点。实验结果表明，方法可以得到较高的解算精度，能够满足无人机航空像片定位的需要。  相似文献   

非线性Kuamoto-Sivashinsky方程的精确控制     

王水球 《成都信息工程学院学报》2009,24(3)

运用泛函分析性质以及Fourier变换的方法研究带有周期边界条件的非线性k-s方程在有限时间区间上的精确控制.首先研究线性化k-s方程的精确控制,证明对于任意给定的函数u0∈Hs,uT∈Hs,总能找到一个控制函数h使得线性化k-s方程有解u且满足u(x,0)=u0,u(x,T)=uT;然后结合线性化k-s方程的精确控制,通过定义Fredholm算子并应用Fredholm算子的一些理论找到非线性化k-s方程的控制函数,使其可精确控制.  相似文献   

Variable orientation within a natural population of the sandhopper Talitrus saltator (Crustacea: Amphipoda) as a response to a variable environment: The case-study of Berkoukesh beach,Tunisia     

Lucia Fanini  Felicita Scapini 《Estuarine, Coastal and Shelf Science》2008

Sandy beaches are harsh environments, driving resident arthropod populations to various typical adaptations, particularly behavioural ones. Here we evaluated the effects of seasonal meteorological variability on the behaviour of Talitrus saltator on Berkoukesh beach (N-W Tunisia). The site is characterised by a Mediterranean climate, but is particularly exposed to seasonal winds and storms. The shoreline is in morphodynamic equilibrium. We tested sandhopper Talitrus saltator orientation in April, when sudden rainfall and storms are common, and in June, when as a rule the weather is warm and dry. The results were analysed with circular statistics and multiple regression models adapted to angular distributions, in order to highlight differences in orientation under the various conditions. Depending on the environmental conditions, amphipods from the same population appeared to utilise various orientation strategies as a response to different environmental constraints. The use of a range of behavioural mechanisms (sun-orientation seaward, sun-orientation landward, and phototaxis) resulted in links to the local landscape and to the animals’ life cycle. As a general conclusion, we can infer that the behavioural variability found within the same population represents a response to seasonal environmental fluctuation. Such an increase in variability is likely to develop on a beach in dynamic equilibrium, where landscape references are stable, and a variable behaviour represents a strategy for dealing with environmental fluctuations.  相似文献   

Orientation of Galaxies in the Local Supercluster: A Review     

F. X. Hu  G. X. Wu  G. X. Song  Q. R. Yuan  S. Okamura 《Astrophysics and Space Science》2006,302(1-4):43-59

The progress of the studies on the orientation of galaxies in the Local Supercluster (LSC) is reviewed and a summary of recent results is given. Following a brief introduction of the LSC, we describe the results of early studies based on two-dimensional analysis, which were mostly not conclusive. We describe next the three-dimensional analysis, which is used widely today. Difficulties and systematic effects are explained and the importance of selection effects is described. Then, results based on the new method and modern databases are given, which are summarized as follows. When the LSC is seen as a whole, galaxy planes tend to align perpendicular to the LSC plane with lenticulars showing the most pronounced tendency. Projections onto the LSC plane of the spin vectors of Virgo cluster member galaxies, and to some extent, those of the total LSC galaxies, tend to point to the Virgo cluster center. This tendency is more pronounced for lenticulars than for spirals. It is suggested that ‘field’ galaxies, i.e., those which do not belong to groups with more than three members, may be better objects than other galaxies to probe the information at the early epoch of the LSC formation through the analysis of galaxy orientations. Field lenticulars show a pronounced anisotropic distribution of spin vectors in the sense that they lay their spin vectors parallel to the LSC plane while field spirals show an isotropic spin-vector distribution.  相似文献   

《颜氏家训》总括范围副词研究     

刘光明 《广东海洋大学学报》2005,25(5):119-123

《颜氏家训》是研究魏晋南北朝汉语的重要语料。全面统计分析其中总括范围副词,分为新、旧两种,并逐一分析其语法功能、语法位置、与其它副词叠用情况以及语义指向等,以管窥魏晋南北朝时期总括范围副词的使用情况,这对于系统研究汉语总括范围副词的发展演变具有重要的参考价值。  相似文献   

IMU/DGPS数据在1∶50000 DOM生产中的应用     

戴立权  巩淑楠  陈世培  曲平 《地理信息世界》2006,(4)

IMU/DGPS(惯导测量仪/差分全球定位系统)技术航测成图法可直接获取外方位元素,缩短航测成图周期,降低航测成本。通过相应的试验及具体生产的实施,阐明利用该技术获取的控制数据进行1∶50000DOM制作的技术流程及作业过程中出现问题的处理方法。  相似文献   

非线性Lyapunov稳定性及Stern''''s Modons的稳定性判据     

罗德海 《成都信息工程学院学报》1993,(4)

本文在构造正压大气运动的浅水波模式的Hamilton守恒量和积分不变的Casimir泛函的基础上,建立了一个积分不变的Lyapunov函数,通过使用变分法,找出了正压旋转流体运动的非线性Lyapunov稳定性判据,并进一步讨论了Stern's Modons的稳定性。  相似文献   

CHINA’S　URBAN　RESIDENTIAL　COMMUNITY　IN　THE　COURSE　OF　TRANSFER　OF　SOCIAL　PATTERN     

Zhang Jingxiang 《中国地理科学(英文版)》1996,(4)

ＣＨＩＮＡ’Ｓ　ＵＲＢＡＮ　ＲＥＳＩＤＥＮＴＩＡＬ　ＣＯＭＭＵＮＩＴＹ　ＩＮ　ＴＨＥ　ＣＯＵＲＳＥ　ＯＦ　ＴＲＡＮＳＦＥＲ　ＯＦ　ＳＯＣＩＡＬ　ＰＡＴＴＥＲＮＣＨＩＮＡ’ＳＵＲＢＡＮＲＥＳＩＤＥＮＴＩＡＬＣＯＭＭＵＮＩＴＹＩＮＴＨＥＣＯＵＲＳＥＯＦＴ...  相似文献