基于零立体像对立体匹配的配后质量控制   总被引：1，自引：0，他引：1  

万志龙 《测绘学院学报》1994,(4)

立体匹配的质量控制对数字摄影测量产品的质量起着关键的作用。本文首先分析了现有的各种质量控制策略，然后根据正射影像同ＤＴＭ及匹配点位存在的固有关系，提出了用零立体像对再匹配作为立体匹配的配后质量控制方案，为立体匹配质量控制开辟了崭新的途径。  相似文献   

Improved Gravimetric Terrain Corrections   总被引：5，自引：0，他引：5  

Y. C. Li  M. G. Sideris 《Geophysical Journal International》1994,119(3):740-752

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SOME MEASUREMENTS OF TURBULENCE CHARACTERISTICS OVER COMPLEX TERRAIN   总被引：2，自引：0，他引：2  

D. FOUNDA  M. TOMBROU  D. P. LALAS  D. N. ASIMAKOPOULOS 《Boundary-Layer Meteorology》1997,83(2):221-245

Results are presented from a windturbulence measurements campaign at the summit of ahill in complex terrain in Andros island (Greece)where a wind turbine park has been constructed. Meanturbulence parameters and power spectra from three 30 mmasts located at the summit, upwind and downwind ofthe hill are analysed to ascertain the differencesfrom respective parameters in flat terrain and toassess the influence of the irregular topography. Thevariances of the horizontal (vertical) wind components are found tobe smaller (larger) than the onesfrom flat terrain. Of the available correlations forthe power spectra, the Von Karman one was found togive better results, although the low frequency partsshow pronounced lags. The asymmetry of the upwindterrain for different wind directions and especiallyits slope is clearly felt both by variances and byspectra. This influence, as expected, is found toincrease with increasing stability. These results havean important significance for wind turbine design andwind energy utilisation.  相似文献   

Optimization of Upstream Profiles in Modelled Flow Over Complex Terrain     

Keith W. Ayotte 《Boundary-Layer Meteorology》1997,83(2):285-309

This paper describes an adjoint method for data assimilation intoupstream boundary conditions of numerical modelsusing optimal control theory. Mathematical formalisms are given along with the numerical implementation of the schemein a column model of the atmospheric boundary layer. The optimized mean and turbulence profiles are used as an upstream solutionin a model of turbulent flow in complex terrain. To contrast thiswith other methods, two solutions for flow over an isolatedhill are calculated, one with an optimized upstream solution andone with a simple surface-layer formulation for the upstream solution.These two solutions are compared to observations and analytical theory. The adjoint optimization method is shown to producesolutions of flow in complex terrain that are substantively differentat the two solutions, with the optimized solution giving more accurate results.  相似文献   

实时战场环境仿真系统中三维地形模型简化的研究     

夏青 《测绘学院学报》1997,(2)

对实时战场环境仿真系统中三线地面模型的简化技术作了较为深入的探讨，并提出一些具有创建性的算法。  相似文献   

从泥炭分布的演化过程分析中国东部和日本一万年来的干湿变迁   总被引：5，自引：0，他引：5  

白光润 《地理科学》1995,15(1):30-38

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A NUMERICAL EXPERIMENT WITH THE EFFECT OF A COMPLICATED TERRAIN ON THE MESOSCALE SYSTEMS          下载免费PDF全文

寿绍文  张书余 《Acta Meteorologica Sinica》1992,(4)

Improvement in two aspects is done of the one-level mesoscale numerical model of Mass et al.(1985)and the re-vised model is used to make a simulation of a severe convective weather process in North China,with the result showingthe pronounced effects of the topography upon the mesoscale systems.  相似文献   

震级一频度曲线呈系统性起伏的可能性及影响     

朱建钢  张跃国 《四川地震》1992,(3):5-12

自从对全球而言的古登堡—里克特关系:lgN(m)=a-bm,被推广应用于各具体的地震区带的地震活动性研究以来,有成功的例子,有艰难但仍获解释的例子,也有谨慎但论据充足的反例。其实,对于第二种情况而言,也未必就不是反例。本文拟从数学反证的角度,证明对于具体的地震区带而言,其震级-频度曲线呈现系统性起伏是可能的。考虑到震级-频度曲线在短临预报和中长期预报中应用广泛,本文还简要评述了如果忽视其系统性起伏可能导致的后果。  相似文献   

一个诊断非平坦地形上边界层风的数值模式   总被引：4，自引：0，他引：4       下载免费PDF全文

赵鸣  马继军 《应用气象学报》1993,4(1):57-64

根据半地转大气边界层模式，由大尺度数值模式并考虑了下垫面地形及粗糙度的水平非均匀性及大尺度气压场的时空变化，给出了一个诊断边界层风的数值模式。对低纬度运用塔层风模式进行诊断。诊断结果与实测资料比较，风向风速均达到了一定的精确度。  相似文献   

兰州山地湍流输送和湍流强度的研究     

张强  胡隐樵 《高原气象》1992,11(2):126-132

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