共查询到20条相似文献，搜索用时 156 毫秒
1.
孙文科 《大地测量与地球动力学》2009,29(6):148-152
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2.
һ���µij��������Ӳ�Ԥ������ 总被引：1，自引：0，他引：1
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3.
������ɽ����SAR����ͼ��λ��������о� 总被引：1，自引：1，他引：0
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4.
??????GPS?????????????????????????????????11??PVA??Position??Velocity??Acceleration)?????????е?????λ??????????????????????????????????????????????????????????????????????ó???????????????????????·??Ч?????????????????????λ???????????????????????????? 相似文献
5.
��ά�ռ����ά�ռ��߲���ת����������·��� 总被引：6，自引：1，他引：5
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6.
����GPS���߽�������ͳ�Ʒ��� 总被引：1，自引：0，他引：1
??????????????????TIKHONOV??????????GPS?????????????????????????????????ε??????????о????????????????????????????????????????????????????????????????????????????????????У?????????з??????Eviews???????????????е????????????????????????ó??????1?????????????????????С??1 mm???????????????????????????????е???????????2????????????????5 mm?????????????????????3???????????X????Y??????н???????????????????????????????????????????????????·??Ч???4???????????Z???????????????????·????Z??????С?? 相似文献
7.
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8.
���μ�����ݵ�С��������Ԥ�ⷽ�� 总被引：3，自引：7，他引：3
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9.
?????????????????????С??????????????????????????С????в????????С????в?????????????????????????Σ??о???????С?????????????С??????????С??????????????????????ó???????????????????ó????????? 相似文献
10.
�ɶ����ƴ��ˮ��ľ�����Ӧ�� 总被引：1，自引：0，他引：1
????10 314?????????????211???????GPS?????????30??????????????????DTM?????????????????WDM94?????????-????????????????1???1???????????????????20???????GPS?????ó???????????飬???????????????????????????????0.009 m?????ó????????????????????????????????????????п??????????? 相似文献
11.
利用求补色立体图屏幕坐标原理,采用浮动水平线法来绘出空间曲面的透视投影图形。通过参数变换可展示出不同视点、不同视角、不同视距下物体表面的形态,通过双眼视觉加强所展示物体表面的真实感。实验表明,该方法有广泛的应用价值。 相似文献
12.
MIN Jianxiong LI Guangxue DING Dong QIAO Lulu MA Yanyan YANG Gang ZHANG Yaqi ZHANG Lei LI Shuhao 《中国海洋大学学报(英文版)》2019,(1)
Based on the observed surface suspended matter in the East China Sea in February 2007 and June 2015, an empirical model was established using L1 b's band 4 data to retrieve surface suspended matter from the Moderate Resolution Imagine Spectroradiometer Terra imagery. The squared correlation coefficient is 0.8358, and the root mean square error is 0.4285 mg L-1. The model reflects the distribution characteristics of surface suspended matter in the inner shelf of the East China Sea. In this paper, the satellite images of the study area were retrieved in January from 2001 to 2015, and the monthly distribution of surface suspended matter were obtained. The inter-annual distribution of the study area is similar, and the concentration of surface suspended matter is higher near the shore than offshore. A large amount of surface suspended matter is transported southeast under the influence of Zhejiang and Fujian coastal current and Taiwan warm current. Only a small amount of surface suspension can reach the Kuroshio area. The surface suspended matter concentration changes obviously near the estuary because of the effect of differences in the flux of the Yangtze River. Meanwhile, winter monsoon, temperature front, El Ni?o events, and other factors affect the distribution of surface suspended matter in 100 m isobath to coastal water but minimally influence the distribution in 100 m isobath to deep sea. 相似文献
13.
分析了运城盐湖盐类矿床的地质特征,指出其剖面上的周期性、平面上的迁移性,演化过程的波浪性,构造环境的峰谷性,成矿物质的多源性,据此提出盆－岭式成盐新模式。 相似文献
14.
Sub-tidal (1.04–25 day) current fluctuations during winter/spring on the continental shelf off Savannah, Georgia (32°N) and
off St. Augustine, Florida (30°N) were compared with records of local wind stress components and GulfStream position. (Acoustic
travel time and bottom pressure measurements at stations on the continental slope were combined to determine main, thermocline
depth, as an indicator of Gulf Stream displacement). Relative wind influences increased towards the coast. GulfStream influence
increased towards the shelf-break and towards the surface. Off Savannah, the Gulf Stream influence was predominately at 12
day period and was negligible at the 45 m isobath. Off St. Augustine, its influence was predominately at 4 day period and
was appreciable at the 40 m isobath (but negligeable at the 28 m isobath). Linear predictions of currents from wind and Gulf
Stream account for ∼80% of the observed variance. Similar methods of studying and predicting the wind—and Kuroshio-influenced
currents on the East China Shelf are proposed. 相似文献
15.
ForoodAZARIDEHKORDI NobukazuNAKAGOSHI 《中国地理科学(英文版)》2004,14(4):350-354
Japan ranks fifth in the world for the number of large dams. Environmental impacts of large dams are known, such as enormous losses of water or disruption of fish spawning, however, impacts of the dams on their up streams are functions of topography of the up stream. Haizuka Dam is located in Hiroshima Prefecture, Japan and its implementation will start in 2006. This large dam influences its up stream through dam making activities, which occurs in order and with different spatial presences that were categorized into chronological and spatial impacts. In this case study, spatial impacts were further divided into horizontal and vertical ones. The horizontal impacts were identified as new roads, diversion tunnel, dam lake, and submerged cultivated land, while vertical impacts were recognized as submerged historical monuments, slope protections, dam body, and deforested area in the reservoir. There were convergences of spatial and temporal impacts, however, the extent of the impacts was limited to the lake boundary. 相似文献
16.
A modelling study of inter-annual variation of Kuroshio intrusion on the shelf of East China Sea 总被引：2，自引：1，他引：1
Inter-annual variability of the Kuroshio water intrusion on the shelf of East China Sea (ECS) was simulated with a nested global and Northwest Pacific ocean circulation model. The model analysis reveals the influence of the variability of Kuroshio transport east of Taiwan on the intrusion to the northeast of Taiwan: high correlation (r = 0.92) with the on-shore volume flux in the lower layer (50–200 m); low correlation (r = 0.50) with the on-shore flux in the upper layer (0–50 m). Spatial distribution of correlations between volume fluxes and sea surface height suggests that inter-annual variability of the Kuroshio flux east of Taiwan and its subsurface water intruding to the shelf lag behind the sea surface height anomalies in the central Pacific at 162°E by about 14 months, and could be related to wind-forced variation in the interior North Pacific that propagates westward as Rossby waves. The intrusion of Kuroshio surface water is also influenced by local winds. The intruding Kuroshio subsurface water causes variations of temperature and salinity of bottom waters on the southern ECS shelf. The influence of the intruding Kuroshio subsurface water extends widely from the shelf slope northeast of Taiwan northward to the central ECS near the 60 m isobath, and northeastward to the region near the 90 m isobath. 相似文献
17.
本文提出了一种湖面面积误差机理模型。首先,以椭圆形(或圆形)、三角形、六边形的面状地物为例,推算不同空间分辨率遥感影像提取面积间的关系,据此推测不同空间分辨率影像提取的湖面面积之间存在着较为固定的函数关系,且函数的系数与湖面的几何形状有关。然后,构建了不同空间分辨率影像的湖面面积间的误差模型,并用多组不同影像提取了艾比湖、阿雅克库木湖面积数据验证其有效性和适应性。结果表明:误差机理模型成功模拟了低空间分辨率影像提取的湖面面积与高空间分辨率影像提取的湖面面积之间的误差关系,可在一定程度上估计误差的具体数值并予以校正。因此,该模型具有校正低分辨率影像提取的湖面面积的能力,为在大区域范围准确地提取湖面面积创造条件。 相似文献
18.
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施一民 《大地测量与地球动力学》2007,27(1):65-68
?????????м?????λ??????????????????????????????????????????λ????????′???????????γ??????????????????????????????????α????????????????????????????????λ??????????????????????????????????????????????????????????????????????????????????????????????λ????λ???????????????б?????????????????????????????? 相似文献
19.
A method combining numerical analysis and limit equilibrium theory to determine potential slip surfaces in soil slopes 总被引：1，自引：0，他引：1
This paper describes a precise method combining numerical analysis and limit equilibrium theory to determine potential slip surfaces in soil slopes. In this method, the direction of the critical slip surface at any point in a slope is determined using the Coulomb’s strength principle and the extremum principle based on the ratio of the shear strength to the shear stress at that point. The ratio, which is considered as an analysis index, can be computed once the stress field of the soil slope is obtained. The critical slip direction at any point in the slope must be the tangential direction of a potential slip surface passing through the point. Therefore, starting from a point on the top of the slope surface or on the horizontal segment outside the slope toe, the increment with a small distance into the slope is used to choose another point and the corresponding slip direction at the point is computed. Connecting all the points used in the computation forms a potential slip surface exiting at the starting point. Then the factor of safety for any potential slip surface can be computed using limit equilibrium method like Spencer method. After factors of safety for all the potential slip surfaces are obtained, the minimum one is the factor of safety for the slope and the corresponding potential slip surface is the critical slip surface of the slope. The proposed method does not need to pre-assume the shape of potential slip surfaces. Thus it is suitable for any shape of slip surfaces. Moreover the method is very simple to be applied. Examples are presented in this paper to illustrate the feasibility of the proposed method programmed in ANSYS software by macro commands. 相似文献
