Study of Methods for Three-Dimensional Multiple-Radar Re ectivity Mosaics          下载免费PDF全文

XIAO Yanjiao  LIU Liping  SHI Yan 《Acta Meteorologica Sinica》2008,22(3):351-361

This paper investigated several approaches to remapping and combining multiple-radar reflectivity fields onto a unified 3D Cartesian grid with high spatial and temporal resolutions,and analyzed systematic observation differences among multiple radars. The remapping approaches were evaluated by inspecting the spatial consistency of the reflectivity fields on vertical and horizontal cross sections on the equidistant line of radars, and the intensity change of 1-h accumulated precipitation before and after interpolation. The combining approaches were evaluated by continuity examination. The results show that for remapping schemes,the vertical interpolation with nearest neighbor on the range-azimuth plane is the most reasonable scheme that provides consecutive reflectivity fields and retains the high-resolution structure comparable to that of the raw data; for multiple-radar data mosaics, the distance-exponential-weighted mean scheme provides spatially consistent reflectivity mosaics. The mosaics can mitigate various problems caused by the radar beam geometry such as the cone of silence.  相似文献   

用CAPPI的资料估算区域降水量和雷达反射率因子垂直廓线初探   总被引：3，自引：0，他引：3  

戴铁丕  袁招洪等 《南京气象学院学报》1995,18(1):119-125

应用上海中心气象台714数字化天气雷达立体扫描资料，分析并比较了单站及区域降水量在不同高度上的差异，并用地面雨量计资料进行了校准，尔后研究了它们的精度。最后初步探讨了上海地区3次降水天气过程中反射率因子Z的垂直分布廓线。  相似文献   

多宝山地区岩石反射波谱研究   总被引：4，自引：0，他引：4  

王海平  张宗贵 《岩石矿物学杂志》1995,14(4):325-335

黑龙江多宝山地区岩石反射波谱研究表明，海西期岩浆岩反射率（ρ）最高，古生代地层次之，火山熔岩最小，岩浆岩中ρ值大则蚀变作用强，ρ值变化大则蚀变类型多，０．７０μｍ谱是岩浆岩蚀变作用显著与否的标志，岩石经热流体后期改造作用后产生强的１．４０、１．９０和２．２０μｍ特征谱。火山熔岩ρ值与ＳｉＯ＿２含量呈正相关，其铜含量高、蚀变作用强则ρ值变化大，ρ值在ＮＩＲ区差异最大并形成三个优选窗口。古生代地层ρ值与碳含量、特征谱数呈负相关，Ｃａ含量、基团与特征谱数、强度呈正相关。据岩石波谱数据及其计算值，文章演绎出地面波谱叠合法并综合其他方法确定了区内ＴＭ图像处理的最佳波段组合。  相似文献   

宝石表面光泽度的理论值     

刘儒 《吉林大学学报(地球科学版)》1993,(4)

从光泽度的物理本质出发,导致出光泽度的理论公式,算出各种不同宝石的光泽度理论值,用此值去判断可能达到最佳的抛光效果。  相似文献   

Lower crustal reflectivity from waveform inversion     

M. Failly  S. C. Singh  R. W. Hobbs 《Geophysical Journal International》1993,115(2):410-420

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西昌盆地白果湾组致密砂岩油气形成关键指标评价与有利区优选          下载免费PDF全文

杨平  陈杨  冯伟明  牟必鑫  魏洪刚  客昆  刘家洪  何磊 《沉积与特提斯地质》2021,41(3):454-464

综合钻井、大量实测剖面、样品测试分析和区域地质资料，对西昌盆地白果湾组烃源岩生烃强度、镜质体反射率、砂岩储层物性等关键指标进行了系统评价。西昌盆地上三叠统白果湾组主要油气储层类型为中-粗砂岩，有利层段主要发育在白果湾组一段、三段和四段，砂岩具有中孔低渗、区域分布广、厚度大等特征，ZD-1井揭示砂岩含油气性好。西昌盆地白果湾组烃源岩在盆地中心厚度大，盆地中心的生烃强度达（56.74~97.70）×10⁸ m³/km²。烃源岩成熟度（R_O）在1.08%~3.98%范围，具有东低西高的特征。通过综合分析西昌盆地油气形成的关键指标，优选了夹铁-四开致密砂岩油气成藏有利区和4个甜点区，该区生烃强度（10~80）×10⁸m³/km²，R_O为1.08%~3.0%，中-粗砂岩厚度为10~50m，天然气资源量为6756×10⁸m³，可形成"改造再重建"致密砂岩油气藏。  相似文献   

一种地物点云数据栅格化分类新方法     

解全波  刘荣  张海明  孙国强 《北京测绘》2021,35(2):235-240

激光技术的不断发展对利用点云数据进行地物分类的方法提出了更高的要求。基于此提出了一种结合遥感领域地物分类特点,利用地物反射率的不同来实现地物分类的方法。该方法首先提取数据的反射率信息,然后将其作为栅格化后的属性值,最后利用监督分类、非监督分类和支持向量机分类方法对栅格化后的栅格影像进行地物分类。通过实验表明,支持向量机方法在保持较高训练和分类速度的同时还具有较高的分类精度,总精度和Kappa系数达到了88.69%和0.86,为点云数据分类提供了一种新的途径。  相似文献   

Interferometric/daylight seismic imaging   总被引：8，自引：0，他引：8  

G. T. Schuster  J. Yu  J. Sheng  J. Rickett 《Geophysical Journal International》2004,157(2):838-852

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Lessons from a joint interpretation of vibroseis wide-angle and near-vertical reflection data in the northeastern Yilgarn, Western Australia     

T. Fomin  B.R. Goleby   《Tectonophysics》2006,420(1-2):301

A wide-angle reflection seismic experiment was carried out in the Eastern Goldfields granite–greenstone terrane of the Archaean Yilgarn Craton during 2001. This was the first time in Australia that wide-angle data were collected using a vibrator source and with a high density of observations. Unlike other wide-angle surveys carried out in other parts of the world, our survey used both a smaller number of sweeps, and shorter sweeps. We recorded three sweeps (each with its own frequency range) at each vibration point. The experiment demonstrated that the sum of three 12 s sweeps using 3 large vibrators provides enough energy to record signal at offsets up to up to 60–70 km. A comparison of individual shot gathers from near-vertical data and receiver gathers from wide-angle data demonstrated higher reflectivity in near-vertical data. This may be due to differences in the frequency bands of the recording equipment. The after stack section obtained from dense wide-angle data is different from that obtained from conventional near-vertical reflection data. The conventional reflection section provides higher quality image of the crust compared to the wide-angle section. This could be explained by the low-fold in wide-angle data and differences in the acquisition and processing methodology. The wide-angle survey, which was coincident with a regional vibroseis seismic reflection transect, was focused on the Leonora–Laverton region. The survey was designed to supplement the deep seismic reflection studies with velocity information. This also created an opportunity to compare velocity model derived from wide-angle reflection seismic data with a structural image obtained from the deep common mid-point seismic reflection data, and thus refine our geological understanding of the area. A high velocity body reaching a maximum thickness of 2 km was identified exclusively from the seismic velocity model derived from wide-angle study. This body is interpreted as mafic rocks within the Archaean Granite–Greenstone Belt. The joint interpretation also shows that structural boundaries do not always follow lithological boundaries in our study area. The combination of wide-angle reflection and near-vertical reflection data has facilitated a more complete geological interpretation of the seismic data.  相似文献   

Deep-crustal mineral assemblages and potential for crustal rocks below the Moho in the Scottish Caledonides   总被引：3，自引：0，他引：3  

Andrew Hynes  David B. Snyder 《Geophysical Journal International》1995,123(2):323-339

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