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杨珍 《测绘与空间地理信息》2019,42(7):11-13
针对建筑物三维模型构建过程中细节缺失、成本较高、效率低下的问题,本文采用倾斜辅助人工建模技术,利用倾斜影像,基于DP-Modeler软件实现建筑物的建模,且与其他建模方法进行比较,采用倾斜辅助人工所建模型保持了建筑物的细节信息,适用于大范围精细模型场景,且提高了建筑物的建模效率,降低了设备成本。 相似文献
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BIM通过数字信息仿真模拟建筑物所具有的真实信息,是近年来国际上工程领域的新型建模技术,逐渐得到广泛应用。本文基于Google SketchUp建立某声学风洞BIM模型,并将其应用于风洞施工过程中的高精度测量工作中。通过研究BIM模型应用于测量的方法,实现了大规模三维测设数据的获取以及大尺度全方位竣工测量误差分析,对于今后相关工程的顺利施工具有重要的参考价值。 相似文献
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本文利用影像上提取的直线信息建立建筑物的初始模型,根据已知的影像内外方位元素将初始模型投影到影像上,结合最邻近直线广义点平差迭代计算建筑物的位置参数与形状参数,实现建筑物的半自动三维重建。这种方法能够减少运算量,提高建模效率与建模精度。然后基于建筑物模型内部约束,给出了详细的带约束条件的建筑物广义点摄影测量平差模型,最后试验验证了其有效性。 相似文献
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In this letter, we are trying to resolve the electromagnetic problem for the movements of the superconducting particles of the protoplanetary cloud in the magnetic field of Saturn. The force of levitation (Meissner-Ochsenfeld phenomenon) is introduced to the field of planetary science for the first time. It is shown from our theoretical analysis that rings of Saturn might have a superconducting origin, and rings might levitate within magnetic equator plane of the planet. 相似文献
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《International Journal of Digital Earth》2013,6(1):80-87
Abstract Cultures throughout the world are associating with the rivers. People depend upon the rivers and their tributaries for food, water, transport, and many other aspects of their daily lives. Unfortunately, human beings have not calculated the accurate lengths for the great rivers even today. The lengths of the rivers are very different in popular textbooks, magazines, atlases and encyclopedias, etc. To accurately determine the lengths of the principal rivers of the world, the combination of satellite image analysis and field investigations to the source regions is proposed in this paper. The lengths of the Nile, Amazon, Yangtze, Mississippi, Yellow, Ob, Yenisey, Amur, Congo and Mekong, with lengths over or close to 5000 km, were calculated using the proposed method. The results may represent the most reliable and accurate lengths of the principal rivers of the world that are currently achievable. 相似文献
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常同元 《测绘与空间地理信息》2016,(10)
在不动产测量中,计算外墙体一半面积的数学模型,只有针对四边形直角房屋的数学模型,而对于多边形直角房屋计算外墙体一半面积的数学模型还没有发现,这给分析多边形直角房屋外墙体一半面积的精度带来困难,本文通过研究分析,推导出了多边形直角房屋外墙体一半面积的数学模型,供研究面积精度者参考。 相似文献