MAPGIS在矿产资源开发遥感调查统计中运用研究     

傅涛  王蔚  刘登创 《云南地质》2012,(2):245-248

以IKONOS 1m分辨率影像数据为例,对在高分辨率遥感影像下解译的露天开采面、开采硐口、固体废弃物、尾矿库、矿山建筑、中转场地等进行分类入库统计研究,以提高工作效率,从而更好地为国土资源管理部门管理矿产资源开发、整顿和规范矿业秩序服务。  相似文献   

Errors of isotope ratios acquired by double interpolation   总被引：1，自引：0，他引：1  

Kenneth Ludwig   《Chemical Geology》2009,268(1-2):24-26

Measurement of isotope ratios via double interpolation of cyclic peak jumping produces error correlations between time-adjacent ratios which, if ignored, result in underestimated errors of their means. Equations that incorporate the error correlations are derived, and an example given for a typical U–Pb/zircon analysis via ion microprobe showing that isotope-ratio uncertainties for a single spot are usually underestimated by factors of 1.2–1.3.  相似文献   

Statistics of Wind and Waves off Tsuyazaki, Fukuoka, in the Eastern Tsushima Strait     

Akira Masuda  Tadao Kusaba  Kenji Marubayashi  Michiyoshi Ishibashi 《Journal of Oceanography》1999,55(2):289-305

The variability of the sea surface wind and wind waves in the coastal area of the Eastern Tsushima Strait was investigated based on the hourly data from 1990 to 1997 obtained at a station 2 km off Tsuyazaki, Fukuoka. The annual mean wind speed was 4.84 m s⁻¹, with strong northwesterly monsoon in winter and weak southwesterly wind in summer. Significant wave heights and wave periods showed similar sinusoidal seasonal cycles around their annual means of 0.608 m and 4.77 s, respectively. The seasonal variability relative to the annual mean is maximum for wave heights, medium for wind speeds, and minimum for wave periods. Significant wave heights off Tsuyazaki turned out to be bounded by a criterion, which is proportional to the square of the significant wave period corresponding to a constant steepness, irrespective of the season or the wind speed. For terms shorter than a month, the significant wave height and the wave period were found to have the same spectral form as the inshore wind velocity: white for frequencies less than 0.2 day⁻¹ and proportional to the frequency to the −5/3 power for higher frequencies, where the latter corresponds to the inertial subrange of turbulence. The spectral levels of wave heights and wave periods in that inertial range were also correlated with those of the inshore wind velocity, though the scatter was large. This revised version was published online in August 2006 with corrections to the Cover Date.  相似文献   

大气（气候）系统可预报性问题的讨论   总被引：1，自引：0，他引：1  

林振山 《地球物理学报》1999,42(Z1):13-17

讨论了大气（气候）系统可预报性问题,并指出:1.线性系统、一维自治动力系统、二维自治动力系统和部分可化为二维自治动力系统的一维非自治动力系统是可以进行数值预报的,其预测结果要比统计方法更为科学。而对浑沌动力系统的预报,统计方法则比动力方法更为严谨。2.非浑沌动力系统或浑沌动力系统在非浑沌区的演化行为客观上存在着可预报期限。  相似文献   

航空工业组团阎良片区土动力学参数统计分析     

任凤文  王晓军  张晗亮  聂大巍 《震灾防御技术》2020,15(1):43-55

基于航空工业组团阎良片区地震小区划项目中大量动三轴试验结果,通过双曲线拟合方法,得到主要土类（黄土状土、粉质粘土、粉土、细砂）在8个典型剪应变（0.000005、0.00001、0.00005、0.0001、0.0005、0.001、0.005、0.01）下的动剪切模量比和阻尼比统计值,并将得到的统计值与廖振鹏给出的建议值、陈党民等给出的典型值和袁晓铭等给出的推荐值进行比较,进一步论证土动力学参数的地域性特征。文中还探讨了土样埋深和取样手段（试样等级）对动剪切模量比和阻尼比的影响。文中给出的统计值可为该片区地震小区划中的土层地震反应模型提供参数,同时也为研究该片区场地土动力特性及重大工程地震安全性评价工作提供参考和借鉴。  相似文献   

Statistics of Surface-Layer Turbulence Over Terrain with Metre-Scale Heterogeneity   总被引：9，自引：8，他引：1  

Edgar L Andreas  Reginald J. Hill  James R. Gosz  Douglas I. Moore  William D. Otto  Achanta D. Sarma 《Boundary-Layer Meteorology》1998,86(3):379-408

Refuge has patchy vegetation in sandy soil. During midday and at night, the surface sources and sinks for heat and moisture may thus be different. Although the Sevilleta is broad and level, its metre-scale heterogeneity could therefore violate an assumption on which Monin-Obukhov similarity theory (MOST) relies. To test the applicability of MOST in such a setting, we measured the standard deviations of vertical (_w) and longitudinal velocity (_u), temperature (_t), and humidity (_q), the temperature-humidity covariance (¯tq), and the temperature skewness (S_t). Dividing the former five quantities by the appropriate flux scales (u_*, _*, and q_*) yielded the nondimensional statistics _w/u_*, _u/u_*, _t/|t_*|, _q/|q_*|, and ¯tq/t_*q_*. _w/u_*, _t/|t_*|, and S_t have magnitudes and variations with stability similar to those reported in the literature and, thus, seem to obey MOST. Though _u/u_* is often presumed not to obey MOST, our _u/u_* data also agree with MOST scaling arguments. While _q/|q_*| has the same dependence on stability as _t/|t_*|, its magnitude is 28% larger. When we ignore ¯tq/t_*q_* values measured during sunrise and sunset transitions – when MOST is not expected to apply – this statistic has essentially the same magnitude and stability dependence as (_t/t_*)². In a flow that truly obeys MOST, (_t/t_*)², (_q/q_*)², and ¯tq/t_*q_* should all have the same functional form. That (_q/q_*)² differs from the other two suggests that the Sevilleta has an interesting surface not compatible with MOST. The sources of humidity reflect the patchiness while, despite the patchiness, the sources of heat seem uniformly distributed.  相似文献   

分析测试质量监控软件的开发与应用   总被引：1，自引：0，他引：1  

谢瑞娟  郝跻颢 《矿产与地质》1998,12(1):67-71

编制了计算机统计计算密码抽查的合格率和插入标准样品分析结果累计统计的精密度和准确度的程序,从而大大减少了管理人员的劳动强度,提高了工作效率。实践证明,应用所编程序统计的合格率、准确度及精密度准确可靠,操作简单,方便。  相似文献   

一种新的布设沉降观测点的方法     

冯文辰  柯冬  梁霄  沈京湘 《北京测绘》2009,(3):69-71

一些构筑物，不能按常规方法埋设观测点，介绍一种新的布设沉降观测点的方法一粘合观测点法，并通过工程实践，对新观测点稳固性进行了统计、分析。  相似文献   

面向海运统计的AIS大数据挖掘分析研究     

赵龙飞  姜晓轶  孙苗  曹磊  郭雪  吕憧憬 《海洋科学》2021,45(12):55-64

为解决传统海运产业统计方法数据质量不高、时效性差、统计产品陈旧短缺、公信力不足等的问题,提出基于AIS大数据挖掘分析开展海运统计的方法.详细阐述了基于AIS大数据的海运统计分析技术路线、大数据平台技术架构,以及电子围栏分析、航行事件分析、航次分析和统计指标生成等关键模型算法.以2019年3月至5月全球大宗货品船舶的AIS数据应用为例表明,该方法可提供港口、海上通道和大宗货品三方面的海运大数据统计指标,为实现海运即时化、准确化、精细化的统计分析与展现提供了新思路.  相似文献   

An uncertainty model for deep ocean single beam and multibeam echo sounder data     

K. M. Marks  W. H. F. Smith 《Marine Geophysical Researches》2008,29(4):239-250

Comparing single beam and multibeam echo sounder data where surveys overlap we find that: 95% of multibeam measurements are repeatable to within 0.47% of depth; older single beam data can be at least as accurate as multibeam; single beam and multibeam profiles show excellent agreement at full-wavelengths longer than 4 km; archival sounding errors are not Gaussian; 95% of archival soundings in the northwest Atlantic are accurate to within 1.6% of depth; the 95th percentile error is about five times greater in pre-1969 data than in post-1968 data; many of the largest errors are located over large seafloor slopes, where small navigation errors can lead to large depth errors. Our uncertainty model has the form σ ² = a ² + (bz)² + (cs)², where 2σ is approximately the 95th percentile error, z is the depth, s is the slope, and a, b, c are constants we determine separately for pre-1969 and post-1968 data.  相似文献