四川赤普铅锌矿床含矿岩系的研究及在找矿评价中的意义   总被引：6，自引：0，他引：6  

龙训荣  徐新煌  温春齐  刘文周 《四川地质学报》1995,(2)

赤普铅锌矿床含矿岩系为上震旦统灯影组海相碳酸盐岩系，含矿岩石主要为一套砾屑白云岩。本文详细地讨论了该矿床含矿岩系的岩相、岩性及其含矿性等特征，并划分了含矿层位；为矿区扩大找矿远景和评价提出了理论依据。  相似文献   

山东省齐河—禹城富铁矿勘查区工作进展及对策          下载免费PDF全文

郝兴中  彭观峰  王润生  张文  刘伟  戴广凯  朱学强 《山东国土资源》2021,37(12)

近年来,在山东省齐河—禹城地区矽卡岩型铁矿勘查工作取得了重大突破,该勘查区内相继发现了李屯、大张和潘店矽卡岩型铁矿床,同时科研工作也取得了较大进展。本文在全面收集和综合分析区内矿产勘查和科研成果的基础上,对该区以往勘查经验和研究现状进行总结,分析该区勘查研究过程中主要制约因素和亟待解决的关键问题。通过对制约因素和关键问题开展对策研究,为今后该区铁矿勘查工作提供借鉴。通过分析表明该区矽卡岩型铁矿的成矿地质体（即燕山晚期中基性侵入岩）应属于沂南序列。勘查区内深部地质体三维空间特征精细刻画、深部地质体控矿构造研究、物探数据深度解译、矿产勘查空间拓展、铁矿成矿规律和矿体赋存规律深入研究等多个方面将是下一步勘查研究工作的重点,加强对上述方面的研究有助于促进区内铁矿勘查工作顺利开展。在加强对物探异常西半环已发现矿体的勘查和类似异常的查证工作的同时,对物探异常东半环加强勘查研究工作对于拓展整个齐河—禹城地区矽卡岩型铁矿的勘查空间具有十分重要的意义。  相似文献   

Relationship Between Land Cover Ratio and Urban Heat Island from Remote Sensing and Automatic Weather Stations Data     

Xingping Wen  Xiaofeng Yang  Guangdao Hu 《Journal of the Indian Society of Remote Sensing》2011,39(2):193-201

Urban heat island (UHI) effect has a close relation to land covers type. This paper investigates the relationship between land cover ratio and UHI in Guangzhou, south of China using remote sensing and automatic weather stations data. The temperature data were obtained by Automatic weather stations (AWS) of Guangzhou in October, 2004, at the same time with the CBERS remote sensing image acquired. Firstly, the hourly mean temperature was computed from hourly AWS data. Secondly, the CBERS remote sensing image was classified using support vector machine (SVM) and land covers classification were output. Thirdly, the classification result was overlapped with a round buffer with 1.5 KM radius centered on the AWS, and then the land cover ratio, Edge Density (ED) and Mean Fractal Dimension (MFRACT) of buffers were computed out. Finally, the correlation coefficient between hourly mean temperature and land cover ratio, ED and MFRACT was calculated. It concluded that UHI intensity was heavier during nighttime than daytime. Stations with higher vegetation ratio and higher ED had lower heat island effect. On the contrary, stations with higher impervious ratio and lower ED had more serious heat island effect. The positive–negative of correlation coefficient between hourly mean temperature and vegetation ratio during 11:00–17:00 h (local time) was opposite to that during other time. ED was negatively correlated with hourly mean temperature except during 11:00–17:00 h. On the contrary, MFRACT was positively correlated with hourly mean temperature. It implied that fragmentations of patches were favorable to UHI alleviation, and complexities of patch were unfavorable factors.  相似文献   

遥感影像亮度和反差分布不均匀性校正算法的效果比较   总被引：1，自引：1，他引：0  

朱述龙  张振  朱宝山  曹闻 《遥感学报》2011,15(1):111-122

提出能同时消除亮度和反差分布不均匀现象的分块均值方差变换法, 重点对插值匀光法、MASK 匀光 法、同态滤波匀光法、Retinex 匀光法以及分块均值方差变换法的校正效果进行了实验比较。研究表明: 分块均值 方差变换法既能消除亮度分布不均匀现象, 又能消除反差分布不均匀现象, 而MASK 匀光法、插值匀光法、Retinex 匀光法只能解决亮度分布不均匀问题, 同态滤波匀光法仅能减弱亮度分布不均匀现象; 在匀光效果方面, 分块均 值方差变换法最好, MASK 匀光法次之, 插值匀光法紧随其后, 接下来是Re  相似文献   

航空重力测量中的厄特弗斯改正     

田颜锋  刘晓刚  孙文  朱军 《测绘工程》2011,20(3):9-11,20

为提高航空重力测量数据的处理精度,在分析厄特弗斯改正计算模型的基础上,研究飞机的速度误差、方位误差和位置误差对厄特弗斯改正的精度影响,进一步研究模型中平方项对滤波处理的影响。结果表明：速度误差是影响厄特弗斯改正精度的主要因素,另外,厄特弗斯改正不需要进行滤波处理。  相似文献   

地理信息网络服务的发展研究     

蔡畅  崔铁军  葛文 《测绘软科学研究》2011,9(1):35-39

随着体系结构、软件层次和自身需求的变化,GIS逐步发展为地理信息网络服务并得到迅速的推广。从标准化、语义化和3维化的角度总结了当前地理信息服务的发展状态,并指出下一代地理信息网络服务必然是基于以上三者的能够实现主动服务和统一多维服务的新一代地理信息服务。  相似文献   

针对海陆图融合的数字海图自动预处理及实现     

文敏  唐新明  史绍雨  文建强  闫浩文  黄伟 《地理空间信息》2011,9(1):126-127,135

通过深入分析数字海图在分幅、坐标系统、投影等方面的特殊性,研究了数字海图在投影和坐标系统等方面的基本预处理技术,解决了数字海图无投影信息和本图坐标系统等造成的问题;并编写程序实现了数字海图的自动批量化预处理,效率高,误差小,解决了实际问题,为数字海图在数据融合、更新等方面的进一步应用提供了前提保障.  相似文献   

RFID和3DGIS技术在数字化城市管理中的应用     

王圆圆  张月香  周文  石强  刘学伟 《测绘与空间地理信息》2011,(6):168-171

当前数字城管系统良莠不齐,在建设中存在较多问题,制约了城市管理信息化水平快速提高,应用RFID技术和3DGIS技术可以较好地解决这些问题。文章介绍了RFID技术和3DGIS技术在数字城管系统中的应用,为城市管理的信息化、数字化开拓了新的发展方向。  相似文献   

Diagnostic analysis of the evolution mechanism for a vortex over the Tibetan Plateau in June 2008   总被引：2，自引：0，他引：2  

李论  张人禾  温敏 《大气科学进展》2011,28(4):797-808

Based on the final analyses data (FNL) of the Global Forecasting System of the NCEP and the obser- vational radiosonde data, the evolution mechanism of an eastward-moving low-level vortex over the Tibetan Plateau in June 2008 was analyzed. The results show that the formation of the vortex was related to the convergence between the northwesterly over the central Tibetan Plateau from the westerly zone and the southerly from the Bay of Bengal at 500 hPa, and also to the divergence associated with the entrance re- gion of the upper westerly jet at 200 hPa. Their dynamic effects were favorable for ascending motion and forming the vortex over the Tibetan Plateau. Furthermore, the effect of the atmospheric heat source (Q1) is discussed based on a transformed potential vorticity (PV) tendency equation. By calculating the PV budgets, we showed that Q1 had a great inffuence on the intensity and moving direction of the vortex. In the developing stage of the vortex, the heating of the vertically integrated Q1 was centered to the east of the vortex center at 500 hPa, increasing PV tendency to the east of the vortex. As a result, the vortex strengthened and moved eastward through the vertically uneven distribution of Q1. In the decaying stage, the horizontally uneven heating of Q1 at 500 hPa weakened the vortex through causing the vortex tubes around the vortex to slant and redistributing the vertical vorticity field.  相似文献   

A Study of Shallow Cumulus Cloud Droplet Dispersion by Large Eddy Simulations          下载免费PDF全文

WANG Xiaofeng  XUE Huiwen  FANG Wen  ZHENG Guoguang 《Acta Meteorologica Sinica》2011,25(2):166-175

Cloud droplet dispersion is an important parameter in estimating aerosol indirect effect on climate in general circulation models (GCMs). This study investigates droplet dispersion in shallow cumulus clouds under different aerosol conditions using three-dimensional large eddy simulations (LES). It is found that cloud droplet mean radius, standard deviation, and relative dispersion generally decrease as aerosol mixing ratio increases from 25 mg⁻¹ (clean case) to 100 mg⁻¹ (moderate case), and to 2000 mg⁻¹ (polluted case). Under all the three simulated aerosol conditions, cloud droplet mean radius and standard deviation increase with height. However, droplet relative dispersion increases with height only in the polluted case, and does not vary with height in the clean and moderate cases.  相似文献