浅述多元数据处理的一种简化拟合形式及算法剖析   总被引：1，自引：1，他引：1  

李继刚  陈华秋  徐春红  李杨眉 《海洋技术学报》2002,21(3):1-4

在实际工程试验与研究中 ,多元数据处理经常遇到 ,根据 Weierstrass定理 ,采用多项式拟合是一种常见的数据处理方法。对于多元多项式的系数求解问题 ,可以归结为超定方程组的求解问题。该文以超定方程组的 SVD求解算法为核心 ,阐述了在工程实际中关于多元数据处理的一种应用方法 ,并尝试给出多元多项式拟合的一种简化方法  相似文献   

用历史数据库实现对GIS时态属性的管理   总被引：4，自引：0，他引：4  

谢传节  王金庄 《测绘工程》1997,6(3):31-34

从有效管理ＧＩＳ时态属性数据的目的出发，设计了一个历史数据库系统，详细 了时态属性以及它的更新操作规则，并提供了历史关系的５种基本运算和历史查询语言。  相似文献   

Parallel cartographic modeling: a methodology for parallelizing spatial data processing     

Eric Shook  Michael E. Hodgson  Shaowen Wang  Babak Behzad  Kiumars Soltani  April Hiscox 《International journal of geographical information science》2016,30(12):2355-2376

  相似文献   

Development of groundwater favourability map using GIS-based driven data mining models: an approach for effective groundwater resource management     

Kehinde Anthony Mogaji  Hwee San Lim 《国际地球制图》2018,33(4):397-422

The development of groundwater favourability map is an effective tool for the sustainability management of groundwater resources in typical agricultural regions, such as southern Perak Province, Malaysia. Assessing the potentiality and pollution vulnerability of groundwater is a fundamental phase of favourability mapping. A geographic information system (GIS)-based Boolean operator of a spatial analyst module was applied to combine a groundwater potentiality map (GPM) model and a groundwater vulnerability to pollution index (GVPI) map, thereby establishing the favourable zones for drinking water exploration in the investigated area. The area GPM model was evaluated by applying a GIS-based Dempster–Shafer–evidential belief function model. In the evaluation, six geoelectrically determined groundwater potential conditioning factors (i.e. overburden resistivity, overburden thickness, aquifer resistivity, aquifer thickness, aquifer transmissivity and hydraulic conductivity) were synthesized by employing the probability-based algorithms of the model. The generated thematic maps of the seven hydrogeological parameters of the DRASTIC model were considered as pollution potential conditioning factors and were analysed with the developed ordered weighted average–DRASTIC index model algorithms to construct the GVPI map. Approximately 88.8 and 85.71% prediction accuracies for the Groundwater Potentiality and GVPI maps were established using the reacting operating characteristic curve method and water quality status–vulnerability zone relationship scheme, respectively. Finally, the area groundwater favourability map (GFM) model was produced by applying a GIS-based Boolean operator on the Groundwater Potentiality and GVPI maps. The GFM model reveals three distinct zones: ‘not suitable’, ‘less suitable’ and ‘very suitable’ zones. The area analysis of the GFM model indicates that more than 50% of the study area is covered by the ‘very suitable’ zones. Results produce a suitability map that can be used by local authorities for the exploitation and management of drinking water in the area. The study findings can also be applied as a tool to help increase public awareness of groundwater issues in developing countries.  相似文献   

点、线符号相关处理的代数方法   总被引：2，自引：0，他引：2  

胡鹏  游涟  陈成永 《武汉大学学报(信息科学版)》1993,(Z1)

本文阐述了采用地图代数的理论自动地处理各类地学信息系统编绘地图中点、线符号相关问题的技术方法——交会运算。  相似文献   

地图代数的符号化方法   总被引：2，自引：0，他引：2  

游涟  胡鹏 《测绘学报》1994,23(2):135-141

根据地学数据库中符号的定位数据和符号码，使用点阵符号库中的符号数据进行符号化，由此得出的图形美观，生动，河流具有粗细变化，该方法简洁通用，具备数据独立性和程序独立性。  相似文献   

The Relegation Algorithm     

André Deprit  Jesúus Palacián  Etienne Deprit 《Celestial Mechanics and Dynamical Astronomy》2001,79(3):157-182

The relegation algorithm extends the method of normalization by Lie transformations. Given a Hamiltonian that is a power series = ₀+ ₁+ ... of a small parameter , normalization constructs a map which converts the principal part ₀into an integral of the transformed system — relegation does the same for an arbitrary function [G]. If the Lie derivative induced by [G] is semi-simple, a double recursion produces the generator of the relegating transformation. The relegation algorithm is illustrated with an elementary example borrowed from galactic dynamics; the exercise serves as a standard against which to test software implementations. Relegation is also applied to the more substantial example of a Keplerian system perturbed by radiation pressure emanating from a rotating source.This revised version was published online in October 2005 with corrections to the Cover Date.  相似文献   

Development of algebra algorithms for automated generation of grain‐size distribution maps     

Alessandro Sarretta  Mauro Masiol  Emanuela Molinaroli 《地球表面变化过程与地形》2007,32(7):1116-1127

  相似文献   

Completely Integrable Systems Connected with Lie Algebras     

Stanisław P. Kasperczuk 《Celestial Mechanics and Dynamical Astronomy》2000,76(4):215-227

In a recent paper Ballersteros and Ragnisco (1998) have proposed a new method of constructing integrable Hamiltonian systems. A new class of integrable systems may be devised using the following sequence: , where A is a Lie algebra is a Lie–Poisson structure on R ₃, C is a Casimir for is a reduced Poisson bracket and (A, ▵) is a bialgebra. We study the relation between a Lie-Poisson stucture Λ and a reduced Poisson bracket , which is a key element in using the Lie algebra A to constructing this sequence. New examples of Lie algebras and their related integrable Hamiltonian systems are given. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

基于地图代数的数字地表流线模拟研究          下载免费PDF全文

吴艳兰  胡鹏  刘永琼 《水科学进展》2007,18(3):356-361

降雨在地表上随地形流动自然形成沟谷线、汇流区、分水岭等流域形态,研究地表流水线的数字模拟对数字流域水文分析具有重要意义.提出数字地表流线模型的概念,只考虑地形因素,利用等高线图建立一个能获得区域内每滴雨水沿地表流动的轨迹模型.并运用地图代数的距离变换对等高线及所在空间进行全方位的距离度量,研究了数字地表流线模型的建立方法.实验表明,该模型利用距离变换信息而不是高程计算流向,可避免DEM高程误差对流向、流线的影响,且不需要在DEM上进行复杂的洼地、平地的识别与处理.该模型对原始数据要求不高,能有效应用于沟谷线的自动提取、汇流区自动分割和分水线网络的自动提取.  相似文献