共查询到20条相似文献，搜索用时 93 毫秒
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《浙江省测绘志》编纂工作于1989年4月开始，在省测绘局和省地方志办公室的领导下，在全省各测绘单位和广大测绘工作者的关心和支持下，在编纂委员会和测绘志办公室同志共同努力下，经过3年的制定编纂方案，阅读历史文献，收集和整理资料，确定篇目草案，拟定行文通则，熟悉志书体裁文体，做好编写的准备工作。 相似文献
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山西局的保持共产党员先进性教育活动在局党组的高度重视、精心组织下，在省委督导组的全面指导和严格把关下，思想发动充分，组织部署到位，经过全体党员和干部群众的共同努力，圆满完成了中央和省委规定的三个阶段， 相似文献
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本文利用不同地物在同一波段或相同地物在不同波段具有不同色调的变化规律，来目视判读７幅ｌ∶ｌ０万的ＴＭ黑白和彩色合成图像。通过细致地分析、对比，在富顺─南溪地区判读不同泥沙含量、不同深浅的水体，了解河床中深槽、浅滩地貌，准确勾绘所有大于像元的水体涯线，确定沟谷的宽度和相对深度，查明沟谷成因，划分漫滩和河谷阶地，圈定丘陵和山地的，分布，研究它们的形态和成因，为区域开发奠定科学的基础。 相似文献
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长治市国土资源局自组建以来，在市委、市政府和山西省国土资源厅的正确领导下，坚持以邓小平理论和“三个代表”重要思想为指导，坚持依法行政，推动国土资源管理方式和利用方式的根本转变， 相似文献
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Karl-Rudolf Koch 《Journal of Geodesy》2014,88(3):263-271
For deriving the robust estimation by the EM (expectation maximization) algorithm for a model, which is more general than the linear model, the nonlinear Gauss Helmert (GH) model is chosen. It contains the errors-in-variables model as a special case. The nonlinear GH model is difficult to handle because of the linearization and the Gauss Newton iterations. Approximate values for the observations have to be introduced for the linearization. Robust estimates by the EM algorithm based on the variance-inflation model and the mean-shift model have been derived for the linear model in case of homoscedasticity. To derive these two EM algorithms for the GH model, different variances are introduced for the observations and the expectations of the measurements defined by the linear model are replaced by the ones of the GH model. The two robust methods are applied to fit by the GH model a polynomial surface of second degree to the measured three-dimensional coordinates of a laser scanner. This results in detecting more outliers than by the linear model. 相似文献
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基于时间序列分析的动态变形预测模型研究 总被引：12，自引：0，他引：12
潘国荣 《武汉大学学报(信息科学版)》2005,30(6):483-487
提出了基于AR并将其推广到CAR模型对时间序列统一建模的新观点和方法，并以实例对动态模型与静态模型分别作了应用比较。结果表明，时间序列分析动态模型预测精度高，用途广泛。 相似文献
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An increasing number of low, medium, and high resolution SAR satellites creates a demand for a generalized sensor model to replace the rigorous sensor model (RSM). The rational polynomial coefficient (RPC) model is a generic sensor model which accurately fits the object-image geometry for various sensor systems with different coefficient values. It has been widely used as an alternative to RSM for photogrammetric processing of optical images, but its applications to SAR images are rarely discussed in publications. In this paper, the feasibility and practicability of the RPC model for SAR images are studied. The RPC model can not only be used to replace the RSM (range–Doppler model for SAR), but also applied to the processing chain for SAR data, thus facilitating the processing of SAR and InSAR data for end users. 相似文献
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时间序列模型预测具有可靠性与高效性的特点。本文结合沉降监测工程,采用Matlab进行建模预报分析,分别基于预测模型(AR、MA、ARMA)进行应用。对比自回归模型、滑动平均模型及自回归滑动平均模型预测结果的精度,表明3种模型可预测期连续分布,模型组合可提高预测精度。 相似文献
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地理信息系统时空数据模型分类 总被引：2，自引：0，他引：2
时空数据模型是地理信息系统领域的重要研究方向之一,许多研究者提出了各种各样的时空数据模型,但关于这许多模型的分类整理问题却很少探讨。本文对数据模型的概念、时空数据模型的抽象层次进行了讨论。根据表达离散变化和连续变化的需要,提出时空概念模型的4种划分:对象事件模型,对象过程模型,场事件模型,场过程模型。以数据模型不同的抽象层次为主线,对时空数据模型进行了分类,并对不同层次的时空数据模型进行了分析。 相似文献
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In this paper, we compare and contrast a Bayesian spatially varying coefficient process (SVCP) model with a geographically
weighted regression (GWR) model for the estimation of the potentially spatially varying regression effects of alcohol outlets
and illegal drug activity on violent crime in Houston, Texas. In addition, we focus on the inherent coefficient shrinkage
properties of the Bayesian SVCP model as a way to address increased coefficient variance that follows from collinearity in
GWR models. We outline the advantages of the Bayesian model in terms of reducing inflated coefficient variance, enhanced model
flexibility, and more formal measuring of model uncertainty for prediction. We find spatially varying effects for alcohol
outlets and drug violations, but the amount of variation depends on the type of model used. For the Bayesian model, this variation
is controllable through the amount of prior influence placed on the variance of the coefficients. For example, the spatial
pattern of coefficients is similar for the GWR and Bayesian models when a relatively large prior variance is used in the Bayesian
model.
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LAND USE SCANNER: An integrated GIS based model for long term projections of land use in urban and rural areas 总被引：9，自引：1，他引：8
This paper describes the structure of the LAND USE SCANNER model, a GIS based model developed to generate spatial forecasts
for various types of land use for a large number of grids. The model basically allocates land according to bid prices for
various types of land use. The possibility of government intervention in land use is taken into account among others by adding
aggregate constraints. The model includes all relevant land use types such as residential, industrial, agricultural, natural
areas and water. The model is driven by sectoral models providing forecasts of aggregate land use in various land use categories.
An application of the first version of the model is given for the Netherlands with some 200,000 grid cells. Further developments
and refinements of the model are planned for the near future.
Received: 18 February 1998/Accepted: 29 September 1998 相似文献
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研究了基于OGRE渲染引擎虚拟拆装的方法及实现.三维模型虚拟装配软件采用MFC混合三维绘制ActiveX组件实现.界面负责将配置文件、模型文件的名称传递给三维模型装配软件,在其加载三维模型完毕后,界面可以访问其三维绘制功能,获取其内部的数据信息;同时可以操作三维空间内的任意一个模型的组件;最后通过修改每个关健帧内的模型... 相似文献
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本文在分析测绘系统开发与应用中测绘数据的复杂性,以及大部分测绘系统都包含业务流程等特点的基础上,除了RBAC模型的角色授权外,加入了任务对操作进行授权,对RBAC模型进行了有效的扩展,使其更具通用性。该方法有效解决了传统的RBAC模型在测绘系统应用中存在的弊端,对其他应用系统建设同样具有理论指导。 相似文献