共查询到20条相似文献，搜索用时 140 毫秒
1.
Two phenomena of similar objects with different spectra and different objects with similar spectrum often result in the difficulty of separation and identification of all types of geographical objects only using spectral information．Therefore,there is a need to incorporate spatial structural and spatial association properties of the surfaces of objects into image processing to improve the accuracy of classification of remotely sensed imagery．In the current article,a new method is proposed on the basis of the principle of multiple-point statistics for combining spectral information and spatial information for image classification．The method was validated by applying to a case study on road extraction based on Landsat TM taken over the Chinese YeHow River delta on August 8,1999． The classification results have shown that this new method provides overall better results than the traditional methods such as maximum likelihood classifier (MLC) 相似文献
2.
正A large area of Late Paleozoic intrusions occursalong the Kalamaili fault in North Xinjiang,which is divided into I-type and A-type granite (Liu et al.,2013),and are the ideal objects for revealing the geological evolution of this region.However,the study of the granodioritic pluton in East Junggar is particularly weak,and previous studies showed different opinions on the Carboniferous tectonic background (e.g.Xu et al.,2013;Zhang 相似文献
3.
肖金凯 《中国地球化学学报》1990,9(2):169-177
With the advantages of all-weather operation and certain penetration microwave remote sensing has become a very important technique,Its image is a function not only of the technical parameters of the sensor but also of the geometric forms and electrical properties,such as the dielectric constants and conductivity,of the ob jects on the ground.Minerals and rocks are the most widspread objects on the earth surface,hence their dielectric properties are of fundamental significance in microwave remote sensing. 相似文献
4.
5.
Xu Yingzi Zhang Baiqing Tang Huiming 《中国地质大学学报(英文版)》2005,16(3):271-276
With the rapid development of water facilities, hydroelectric projects, highways and railways in China, beam-anchor reinforcement has been widely used to stabilize slopes in recent years. But the theory for the design of beam-anchor reinforcement is far behind the application. Cross beam-ground anchor reinforcement is a combination of beams and anchors forming a new structure to prevent slope sliding. The forces in the beams are discussed using theoretical analysis and numerical modeling. The Winkler model is used to analyze the beams, and reasonable values of λ, length, spacing and cantilevered length for the beams are determined through a theoretical analysis. A three-dimensional finite element method is adopted to model the interaction of the beams and soils and a structure analysis is applied to treat the beams and to study the stress distribution in external and internal beams. The analytical results show that it is better to satisfy λ≥2π, the spacing between anchors ls should be lsλ<π/2 and cantilever length should be (0.3-0.5)ls for the optimum design. The numerical results show that the same design can be used for all beams in different directions, including the internal and external beams. The application of the analytical method for reinforcement beam analysis is acceptable. It is better to choose a safety coefficient of 1.3 for design based on the analytical method for safety. 相似文献
6.
正Three-dimensional geological modeling(3DGM) assists geologists to quantitatively study in three-dimensional(3D) space structures that define temporal and spatial relationships between geological objects.The 3D property model can also be used to infer or deduce causes of geological objects.3DGM technology provides technical support for extraction of diverse geoscience information,3D modeling,and quantitative calculation of mineral resources.Based on metallogenic concepts and an ore deposit model, 3DGM technology is applied to analyze geological characteristics of the Tongshan Cu deposit in order to define a metallogenic model and develop a virtual borehole technology;a BP neural network and a 3D interpolation technique were combined to integrate multiple geoscience information in a 3D environment. The results indicate:(1) on basis of the concept of magmatic-hydrothermal Cu polymetallic mineralization and a porphyry Cu deposit model,a spatial relational database of multiple geoscience information for mineralization in the study area(geology,geophysics,geochemistry,borehole,and cross-section data) was established,and 3D metallogenic geological objects including mineralization stratum,granodiorite, alteration rock,and magnetic anomaly were constructed;(2) on basis of the 3D ore deposit model,23,800 effective surveys from 94 boreholes and 21 sections were applied to establish 3D orebody models with a kriging interpolation method;(3) combined 23,800 surveys involving 21 sections,using VC++ and OpenGL platform,virtual borehole and virtual section with BP network,and an improved inverse distance interpolation(IDW) method were used to predict and delineate mineralization potential targets (Cu-grade of cell not less than 0.1%);(4) comparison of 3D ore bodies,metallogenic geological objects of mineralization,and potential targets of mineralization models in the study area,delineated the 3D spatial and temporal relationship and causal processes among the ore bodies,alteration rock,metallogenic stratum,intrusive rock,and the Tongshan Fault.This study provides important technical support and a scientific basis for assessment of the Tongshan Cu deposit and surrounding exploration and mineral resources. 相似文献
7.
Since the environmental capacity and the arable as well as the inhabitant lands have actually reached a full balance, the slopes are becoming the more and more important options for various engineering constructions. Because of the geological complexity of the slope, the design and the decision-making of a slope-based engineering is still not practical to rely solely on the theoretical analysis and numerical calculation, but mainly on the experience of the experts. Therefore, it has important practical significance to turn some successful experience into mathematic equations. Based upon the abundant typical slope engineering construction cases in Yunnan, Southwestern China, 3 methods for analyzing the slope stability have been developed in this paper. First of all, the corresponded analogous mathematic equation for analyzing slope stability has been established through case studies. Then, artificial neural network and multivariate regression analysis have also been set up when 7 main influencing factors are adopted. 相似文献
8.
Valeri Grebenets 《冰川冻土》2004,26(Z1):296-300
In last years, the problem of building s stability in northern areas has become aggravating. The main reasons mass deformations areas follows: 1) mistakes during research, planning, construction and operation of objects; 2) negative changes in frozen ground, bound with reduction of footing s bearing capacity under technogenic impact; 3) premature wear of material of underground constructions under influence of natural and technogenic factors. 相似文献
9.
Wang Guangjun Tian Jinwen Chen Zhenyu Liu JianState Key Laboratory for Image Processing Intelligent Control Institute for Pattern Recognition Artificial Intelligence Huazhong University of Science Technology WuHan Wu Guoping 《中国地质大学学报(英文版)》2000,11(1)
INTRODUCTIONImage thresholding has been widely used in many areas,and there are many methods for thresholding. But it is verydifficult to segmentgravel objects,because of wide variation ingray levels and particle dimensions and the presence of manysmall objects in the background corrupting the image bystationary or white noise. Shannon’s entropy is a concept ininformation theory,which means the more information,theless the entropy value. By m eans of entropy concept,researchers have prop… 相似文献
10.
<正>Rigid ellipsoidal objects(gravels and porphyroclasts)in ductile zone is an important factor to indicate the kinematics and dynamics.Jeffery’s theory(Jeffery G,1922),a quantitative research method,for the rotation ofthe rigid objects(no deformation)in the Newtonian fluid of the simple deformation field has been widely applied by geologists to the study of fabrics in rocks.The theory 相似文献
11.
B. N. Abramov 《Lithology and Mineral Resources》2011,46(4):353-362
Peculiarities of formation and ore potential of black shales of the Paleoproterozoic Udokan Group are considered. They are
compared to the stratotype (Khokholma Formation, Sukhoi Log gold deposit). The black shales are confined to lower parts of
the Paleoproterozoic sequence of the Udokan Group. They are observed in sections of the Chitkanda, Inyr, Ayan, and Ikab’ya
formations. The black shale complex of the Udokan Group is divided into three levels of Au concentration. The first level
with background Au contents is typical of barren shales; the second level is confined to sulfidized rocks; and the third level
is related to sulfide-quartz veins in the black shales. The average Au content is 0.12 g/t in the sulfidized shales and 0.28
g/t in the sulfide-quartz veins. Black shales of the Udokan Group and Khokholma Formation were formed in a relatively deep
shelf zone, while those of the Shaman Formation precipitated in a shallow zone. Protoliths of black shales of the Udokan Group
contained graywackes, diorites, syenites, basic rocks, and tuffites. Protoliths of black shales of the Khokholma Formation
were produced by the intense weathering of basic and ultrabasic rocks. 相似文献
12.
Numerous Cu deposits of the Udokan-Chineysky ore district (Udokan deposit of cupriferous sandstones, deposits of the Chineysky pluton, etc.), which occur in sedimentary and igneous rocks, are similar in many genetic features. One of these features is the similar parameters of fluid inclusions (hydrothermal fluids) in quartz of the Udokan deposit, rich chalcopyrite ores from the Rudnyi (Rudnyie deposit, and veins of the Pravoingamakitsky deposit studied previously. Fluid inclusions have the same range of high salinity and homogenization temperatures. These studies combined with geological data allow us to consider the formation of contact sulfide ores from the Chineisky pluton and Pravoingamakitsky and Udokan deposits as a common compound fluid-magmatic ore-generating system. The sedimentary rocks primarily enriched in chalcopyrite, pyrite, and pyrrhotite of the entire section of the Udokan complex served as the host media for the hydrothermal fluids and deposits of various scales. 相似文献
13.
On the basis of detailed fieldwork and analytical procedures (microprobe, X-ray diffraction, chemical analysis, etc.), ores
and altered wall-rock rocks of the Khadatkanda and Etyrko deposits in the Kodar-Udokan mineragenic zone were studied. Economic
concentrations of gold and some other accompanying metals have been established in ore of the Khadatkanda uranium deposit
in the Syul’ban uranium district. REE-U lodes with brannerite-uraninite have been found at the Etyrko Fe-Ti-V deposit related
to the Chinei layered pluton in the Udokan mining district. The outlook for the discovery of new types of economic uranium
deposits is substantiated with respect to the known hydrothermal uranium ore objects and nontraditional setting related to
the layered mafic-ultramafic intrusions. 相似文献
14.
A. B. Kotov E. B. Salnikova V. P. Kovach S. D. Velikoslavinskii E. V. Sklyarov D. P. Gladkochub A. M. Larin E. V. Tolmacheva A. M. Fedoseenko Yu. V. Plotkina 《Doklady Earth Sciences》2018,479(2):415-419
Biotite plagiogranite intruding sediments of the Kodar Sub-Group of the Udokan Group that have both undergone amphibolite grade alterations has been dated by the U–Pb ID TIMS technique using zircon to 2105 ± 6 Ma. This age estimate to a first approximation corresponds to the younger age limit of deposition of the siliciclastics in the lower section of the Udokan Group. 相似文献
15.
B. N. Abramov 《Lithology and Mineral Resources》2008,43(1):37-43
The maturity of terrigenous material of the Paleoproterozoic Udokan copper-bearing sedimentary complex is considered. The average values of hydrolyzate module (HM), alumina-silica module (AM), and Pettijohn’s coefficient of maturity appreciably vary throughout the Udokan Complex. Among cupriferous sandstones, rocks of the Aleksandrovka Formation are characterized by the highest maturity, whereas rocks of the Chitkanda Formation are distinguished by the lowest maturity. The maturity of cupriferous sandstones of the Sakukan Formation corresponds to that of host rocks. The maturity of cupriferous sandstones from the Aleksandrovka Formation is much higher than that of host rocks. In the Chitkanda Formation, the cupriferous sandstones are much less mature than host rocks. Climatic conditions in provenances estimated from the Nesbitt index of chemical weathering or chemical index of alteration (CIA) may be characterized as temperate ones without prominent climatic features. Most CIA values range from 46 to 66. The formation of copper-bearing sediments was closely related to the periods of volcanic activity. 相似文献
16.
Yarmolyuk V. V. Savatenkov V. M. Stupak F. M. Kudryashova E. A. 《Doklady Earth Sciences》2020,493(1):517-521
Doklady Earth Sciences - The Udokan volcanic plateau differs from other volcanic regions of the Late Cenozoic volcanic province of East Asia in the high alkalinity of volcanic rocks, their... 相似文献
17.
高密度电阻率法在城市地下目的物探测中的应用 总被引：1，自引：0，他引：1
城市地下目的物的无损探测一直是城市建设中的重要课题.从地下管渠、防空洞、地下构筑物等方面的探测实例出发,全面阐述高密度电阻率法在城市地下目的物探测中的应用效果,说明采用高密度电阻率法对城市地下目的物的探测是有明显效果的,其图像特征与实际目的物的形态相近,成果直观且有效. 相似文献
18.
《International Geology Review》2012,54(11):1305-1315
Certain stratigraphic horizons of the lower Proterozoic Udokan contain ore deposits and shows in cupriferous sandstones of the Kodar-Uclokan structural and fades zone. Copper mineralization occurs in the Chitkanda, Aleksandrovst, Butun, Talakan, Salcukan and Naminga formations and is of sedimentary origin, syngenetic with its carrier rocks. Most cupriferous sandstones are found in the Chitkanda, Talakan and Sakukan formations; these facies are arranged in definite belts with relation to the copper source area. Areas of the Kodar-Udokan zone lying north of the southern boundary of the several copper belts (fig. 4) are the most promising for copper production. Also prospective are areas of young depressions in the north and southeast of the zone of copper belts. It may be that considerable stretches of the Udokan cupriferous horizons are to be found here.--IGR Staff 相似文献
19.
V. P. Kovach A. B. Kotov D. P. Gladkochub E. V. Tolmacheva S. D. Velikoslavinsky B. M. Gorokhovsky V. N. Podkovyrov N. Yu. Zagornaya Yu. V. Plotkina 《Doklady Earth Sciences》2018,482(1):1138-1141
Results of U–Th–Pb LA–ICP–MS analysis of detrital zircons from metasandstones of the Chiney Subgroup (Udokan Group, Aldan Shield) have been obtained. It has been revealed that rocks of the Paleoproterozoic (about 1.90, 1.98, and 2.50 Ga) and Neoarchean (2.55 and 2.72 Ga) were their provenance sources. Deposition of the Chiney Subgroup occurred in the interval 1.87–1.90 Ga and was separated in time from the accumulation of the Kodar Subgroup siliciclastics (2.1–2.3 Ga). 相似文献
20.
The stratigraphic setting and geological environment of the Boorloo stratiform copper prospect is described. This prospect occurs in the Umberatana Group of the Adelaide Supergroup in the Willouran Ranges of South Australia. Stratiform copper mineralization occurs in stacked, braided, siliciclastic channels on the middle and distal portions of a late Proterozoic river-dominated delta. Comparison is made between this river-dominated delta copper system and the much larger river-dominated delta copper system of the Proterozoic Udokan deposit in the U. S. S. R. It is suggested that the traditional classifications of stratiform copper sensu strictu deposits as arenaceous-ore or oreshale can be viewed as dip-system or strike-system deposits respectively. 相似文献