Because there exists a high randomness an easier weighted method is used to establish Grid-format data to approximately describe 3-D space topography, 3-D topography is constructed for Grid-format data by using OpenGL technology, and a free transform of the space curved surface is realized, including parallel move, zoom, circumgyrate. Simultaneously, an algorithm of random incision of 3-D space curved surface containing most six sides is provided, in comhination of geologic evolution, element.

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One charactistics of the visualization system is to control the revelation of the picture. The system has formed shift, circumrotation and zoom kinds so that the user can exactly control the view revelation.

本文編制了一個能讀取多種基于Grid地形網(wǎng)格數(shù)據(jù)的程序接口，通過本接口程序能很快的實現(xiàn)相關(guān)地形的顯示欧美老妇性爱视频，本文的接口程序具有通用性国产色无码专区视频。

By comparing and analyzing, it is concluded that for simple and slow slope terrain, the change of wind speed around hill can be truly calculated by some experimental formula such as MSFD calculations. While for cliffy slope and complex terrain experimental formula cant calculate the wind speed truly, it is well to analyze the question by numerical simulation.

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The gas spill angles in the present experiment are 0°, 45° and 90°. The densimetric Froude number are 8, 10, 12, and 15. The terrain parameter are urban type and rural type natural turbulent boundary layers, respectively.

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The delta depositional system generally has three topography slope breakpoints, namely the breakpoint between topset and foreset, the breakpoint between delta foreslope and prodelta and the breakpoint between delta depositional system and normal lacustrine depositional system, of them the topography grade of the foreslope i...

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The delta depositional system generally has three topography slope breakpoints, namely the breakpoint between topset and foreset, the breakpoint between delta foreslope and prodelta and the breakpoint between delta depositional system and normal lacustrine depositional system, of them the topography grade of the foreslope is the biggest.

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Regarding to the estimation of the elevated together with suspended heights of pipeline above the sea floor, they can be calculated with the Frontward and Backward models derived in this dissertation. Models are tested, and indicated the calculations have been effective.

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Topographic correction based on sun-canopy-sensor geometry is more appropriate than terrain-based corrections in forest areas because SCS preserves the geotropic nature of trees regardless of terrain, view, and illumination angles.

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These samples were collected along a main street across the urban area and a mountain route from foot to the top. Results demonstrate that the main magnetic minerals in the street dust are magnetite, maghaemite and haematite with some paramagnetic minerals. Plots of Mrs/Ms vs. Bcr/Bc and Xfd % vs. X ARM/SIRM indicate that the main grain size of magnetic minerals in the street dust are pseudo single domain. The results reveal that the Lanzhou city is more polluted in spring than in summer. The main pollution sources are anthropogenic activities （81.9%） and natural dust （18.1%）, especially the former. The spatial distribution of pollution is controlled by the topography and weather conditions.

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This method improves the computational accuracy, embodies the precipitation changes with topographty and the distributive incontinuity of precipitation, and solves the problem of the precision of the spatial interpolation of precipitation under complicated topographty condition.

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