概论机场能见度的准确预报     

张晓晖 《成都信息工程学院学报》2002,17(3):166-169

通过对影响能见度的因素的分析，提出了一种能见度预报方法－综合分析法，极大地提高了能见度的预报准确率。  相似文献   

Synthetic information prediction system for crisis mine based on GIS     

Yuxin Ye  Ping Yu  Shi Wang  Shuisheng Ye 《世界地质(英文版)》2006,9(1)

Reserves of some kinds of the crisis mines will be lack now or from now on, because of lacking seriously reserves of mineral resources and the crisis of exploring bases in support. So that it is urgent to predict, appraise, development and utilize the replaceable resources of the crisis mines. The mineral resources prediction software system of synthetic information is intelligent GIS which is used to quantitative prediction of large-scale synthetic information mineral target. It takes the geological body and the mineral resource body as a unit. And it analyzes the ore deposit genesis and metallotect, knows the spatial distribution laws of the ore deposit and ore body, and establish the prospecting model based on the concept of establishing the three-dimensional space of a mine. This paper will primarily discuss some important problems as follows: the secondary development of various kinds of data(including geology, geophysical prospecting, geochemical prospecting and remote sensing, etc); process synthetically and establish the synthetic information interpretative map base; correspond prospecting model with synthetic information of ore deposit; divided into statistical units of metallogenic information synthetic anomalies based on the synthetic information anomalies of ore control, then research the metallogenic information variable of unit synthetically and make quantitative prediction according to choose the quantitative prediction math model which is suitable to the demands of large-scale precision; at last, finish the target area optimization of ore deposit (body).  相似文献   

Wave Height Estimation from SAR Imagery     

杨劲松黄韦艮  周成虎肖清梅 《中国海洋湖沼学报》2004,22(2):157-161

This paper presents a method developed for estimating wave height from synthetic aperture radar (SAR) imagery without prior assumption of noise distribution. It is based on two-dimenslonal ocean wave spectra retrieved from fully calibrated SAR images. Wen‘s spectrum was used as first-guess wave spectrum in the retrieval process. Comparison of the estimated wave height obtained by this method from two ERS-1 SAR subimages dated 23 July 1994 with in-situ measurements showed that the method works well.  相似文献   

Seismic representation theorem coupling: synthetic P–SV mode sum seismograms for non-homogeneous paths     

Janice Regan 《Geophysical Journal International》1991,106(3):587-609

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Regional distance shear-coupled PL propagation within the northern Altiplano, central Andes   总被引：1，自引：0，他引：1  

Jennifer L. Swenson  Susan L. Beck  & George Zandt 《Geophysical Journal International》1999,139(3):743-753

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Wave propagation in three-dimensional spherical sections by the Chebyshev spectral method   总被引：1，自引：0，他引：1  

Heiner Igel 《Geophysical Journal International》1999,136(3):559-566

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Scattering of S waves diffracted at the core–mantle boundary: forward modelling     

Valérie Emery  Valérie Maupin  & Henri-Claude Nataf 《Geophysical Journal International》1999,139(2):325-344

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干涉雷达在DEM测量中的精度影响及处理方法   总被引：1，自引：0，他引：1  

郭泾平  彭军  向茂生 《测绘学院学报》1998,(3)

干涉合成孔径雷达 (INSAR)为数字高程模型 (DEM)测量提供了一种新的手段。它具有同时获取三维信息、测量范围广、空间和高程分辨率高等优点。文中首先扼要介绍了干涉雷达的原理 ,然后重点讨论几个影响测量精度的因素及其处理方法 ,如相关、运动补偿、配准、相位展开等。  相似文献   

Site amplifications in the city of Benevento (Italy): comparison of observed and estimated ground motion from explosive sources     

F. Marrara  P. Suhadolc 《Journal of Seismology》1998,2(2):125-143

A hybrid approach is applied to construct 2-D synthetic seismograms for explosive sources. The computation of the signals has been performed with a hybrid technique, that couples the modal summation method, describing the P-SV propagation from the source to a target area, to the finite difference method, allowing the computation of the 2-D response of the target area. We use this technique to study the site response in the city of Benevento (Southern Italy). The results are compared both with those obtained for the same model, but considering an extended double-couple source and SH wave propagation and with those derived from a direct analysis of experimental data obtained during the Benevento Seismic Risk Project, funded by the Commission of European Communities. The type and depth of the source and the source-receiver distance can provide different excitations, but the response of the target area, in terms of ratios of response spectra, remains in general stable in the high frequency range (>2 Hz). The explosive source does not excite lower frequencies and is therefore unable to provide estimates of site effects in this frequency range. We also show that it is important to consider both P-SV and SH waves when assessing site effects. Finally, a very good definition of a structural model from geological data is fundamental in order to explain the observed data in the time domain. The observed data validate our synthetic modelling for evaluating the site effects and for a tentative seismic microzonation of the city of Benevento.  相似文献   

Polarization anomaly of Love waves caused by lateral heterogeneity   总被引：1，自引：0，他引：1  

Reiji Kobayashi 《Geophysical Journal International》1998,135(3):893-897

We calculate surface waves propagating in a laterally heterogeneous structure beneath the Kuril trench, where significant Love-wave polarization anomalies, called quasi-Love waves, are generated. Since 3-D wave propagation in the two-dimensionally heterogeneous structure can be assumed, we apply the 2.5-D finite difference method to the surface-wave calculations. The calculations show that a velocity contrast of 7 per cent at depths of less than 210 km beneath the Kuril trench cannot generate quasi-Love waves, and that an unlikely contrast of 20 per cent is required to generate clear quasi-Love waves. The possible cause of the quasi-Love waves inferred from previous studies on coupled free oscillations is a lateral variation in azimuthal anisotropy. The lateral variation in azimuthal anisotropy beneath the Kuril trench suggests a change in the mantle flow induced by the subducting slab.  相似文献