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阐述了在工作实践中利用WorldView-2卫星影像制作正射影像的基本工艺流程,着重分析卫片的融合、校正、影像镶嵌等处理环节中的方法,坐标的建立及转换,数据格式的转换等,以及此过程中遇到的问题,及在各个环节中的质量控制。 相似文献
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随着城市化进程的不断加快,城市基础地理信息的更新有了更高的要求,在城市基础地理信息的更新中,正确合理地引入地籍测绘成果具有重要意义,可以大大提高数据更新的速度,保证更新质量,从而使城市建设更为规范和有序。本文以基础地理信息数据更新和地籍测绘成果两者的相关性和差异性入手,对基础地理信息数据的更新进行了系统分析,并在此基础上对地籍测绘成果的应用要点进行了说明。 相似文献
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The effect of solar wind (SW) on the North Atlantic sea surface temperature (SST) in boreal winter is examined through an analysis of observational data during 1964-2013. The North Atlantic SSTs show a pronounced meridional tripolar pattern in response to solar wind speed (SWS) variations. This pattern is broadly similar to the leading empirical orthogonal function (EOF) mode of interannual variations in the wintertime SSTs over North Atlantic. The time series of this leading EOF mode of SST shows a significant interannual period, which is the same as that of wintertime SWS. This response also appears as a compact north-south seesaw of sea level pressure and a vertical tripolar structure of zonal wind, which simultaneously resembles the North Atlantic Oscillation (NAO) in the overlying atmosphere. As compared with the typical low SWS winters, during the typical high SWS winters, the stratospheric polar night jet (PNJ) is evidently enhanced and extends from the stratosphere to the troposphere, even down to the North Atlantic Ocean surface. Notably, the North Atlantic Ocean is an exclusive region in which the SW signal spreads downward from the stratosphere to the troposphere. Thus, it seems that the SW is a possible factor for this North Atlantic SST tripolar mode. The dynamical process of stratosphere-troposphere coupling, together with the global atmospheric electric circuit-cloud microphysical process, probably accounts for the particular downward propagation of the SW signal. 相似文献
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李德林 《水文地质工程地质》2016,(1):99-104
实际工程中,由于土质的不均匀性、试验条件限制、取样和运输过程产生扰动等因素的制约,使得岩土抗剪强度参数的试验值与实际相差太大。为了取得可靠的计算参数,有必要对滑动带土的抗剪强度参数C,φ进行优化,本文根据滑坡的变形发展阶段确定了合理的稳定系数后,利用Microsoft Excel非线性规划求解器的既约梯度法,对边坡的抗剪强度参数进行了优化,得到了可靠的滑坡稳定系数和抗剪强度参数。 相似文献
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以民用机场拟建甚高频(VHF)遮蔽角的测绘实践和方法为例,阐述如何测定拟建甚高频(VHF)四周范围内障碍物的遮蔽角,并根据测定甚高频(VHF)的遮蔽角值,为障碍物的限制高度评估提供精确数据依据,及时拆除影响较大的障碍物,净化民航机场电磁环境,为申请甚高频(VHF)正式批复、建设提供基础数据保障。 相似文献
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