Mapping from remote sensing has become more effective in the field of geology, mainly in lithological discrimination and identification of hydrothermal alteration zones. The use of this technique consists in obtaining...Mapping from remote sensing has become more effective in the field of geology, mainly in lithological discrimination and identification of hydrothermal alteration zones. The use of this technique consists in obtaining information about the rock mass and the main ones existing in the inaccessible areas. Satellite data from the ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) sensor represent a favorable potential for detecting the spectral signatures of mineral zones and identifying their nature. These data are more reliable in places where the climate is arid with less abundant vegetation, as at the Oumjrane-Boukerzia mining district. This region which is part of the Eastern Anti-Atlas, is composed of several mineralized veins which still require detailed studies and exploration by the technique of remote sensing. In this work we applied several processing techniques on ASTER imagery such as Colored Composition, Principal Component Analysis and Ratio Bands. The use of the reports of the specialized Bands makes it possible to identify some hydrothermal alteration minerals within the mining district of Oumjrane Boukerzia. These minerals are represented mainly by iron oxides and hydroxides (Hematite, jarosite, limonite and goethite), carbonate minerals (dolomite, calcite), clay minerals (Illite, kaolinite and chlorite) and quartz minerals. This work allows us to produce a map of hydrothermal alteration zones which can be used as a valuable reference in the strategy of mining exploration for the base metals (Cu, Pb, Zn and Ba), in the mining district of Oumjrane-Boukerzia and in the entire Eastern Anti-Atlas.展开更多
In film production cinematography is a visual medium that connects the film experience to the viewers.Just like other crew members such as directors and actors,specific names of cinematographers become common in the A...In film production cinematography is a visual medium that connects the film experience to the viewers.Just like other crew members such as directors and actors,specific names of cinematographers become common in the African film industry.Abebe Ketsela,who has a career spanning many decades and popular designations,is regarded as one of the best intellect cinematographers in Ethiopian cinema.This qualitative content analysis examines his works his cinematography skill emerged from his ability to utilize shot selection,framing,and composition.This qualitative content analysis of Aster film focuses on the Cinematography concept of camera mobility,and lighting techniques to tell the story naturally so.This is the revised transcription of an interview with Abebe Ketsela that took place on September 27th 2021 at the Department of Film Production Studio at Ale-School of Fine Arts and Design,Adds Ababa University,St.marry Avenue,Addis Ababa,Ethiopia,the place where African filmmakers teach film directing,Cinematography,and screenplay writing.The film production Department is the first Film School which is opened in 2015.This place in this site is a vigorous Black African center as film making education school at the level of second Degree and the excremental area of his creative works.The interview spanned three and a half hours and roofed an extensive range of topics,most of which pivoted around:A glimpse on Ethiopian film through a cinematographer of Aster:how his visual creation reveals in his cinematography.展开更多
遥感卫星的多光谱数据应用于找矿已取得显著成效,2004年7月中国卫星地面站开始提供ASTER(Advanced Space-borne Thermal Emission and Reflection Radiometer,高级星载热发射反照辐射计)数据,因涵盖波长范围宽[VNIR(Visible and Near In...遥感卫星的多光谱数据应用于找矿已取得显著成效,2004年7月中国卫星地面站开始提供ASTER(Advanced Space-borne Thermal Emission and Reflection Radiometer,高级星载热发射反照辐射计)数据,因涵盖波长范围宽[VNIR(Visible and Near Infra-red)、SWIR(Short wave-length Infra-red)、TIR(Thermal Infra-red)]、波段多(14个波段)、性价比合理等因素,ASTER数据的研究迅速发展。长久以来,对覆盖区进行蚀变遥感异常信息提取一直是遥感找矿的关注点之一。笔者等利用ASTER数据对浅覆盖区——包古图斑岩铜矿的Ⅱ号、Ⅴ号斑岩体进行蚀变遥感异常提取,提取的蚀变异常与野外地质情况吻合性好。分别提取了光谱特征谱带差异明显的2组蚀变矿物的异常信息:第一组是蒙脱石、埃洛石、伊利石与绢云母;第二组是方解石、黑云母与绿泥石。提出了需要进一步工作的异常靶区。展开更多
文摘Mapping from remote sensing has become more effective in the field of geology, mainly in lithological discrimination and identification of hydrothermal alteration zones. The use of this technique consists in obtaining information about the rock mass and the main ones existing in the inaccessible areas. Satellite data from the ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) sensor represent a favorable potential for detecting the spectral signatures of mineral zones and identifying their nature. These data are more reliable in places where the climate is arid with less abundant vegetation, as at the Oumjrane-Boukerzia mining district. This region which is part of the Eastern Anti-Atlas, is composed of several mineralized veins which still require detailed studies and exploration by the technique of remote sensing. In this work we applied several processing techniques on ASTER imagery such as Colored Composition, Principal Component Analysis and Ratio Bands. The use of the reports of the specialized Bands makes it possible to identify some hydrothermal alteration minerals within the mining district of Oumjrane Boukerzia. These minerals are represented mainly by iron oxides and hydroxides (Hematite, jarosite, limonite and goethite), carbonate minerals (dolomite, calcite), clay minerals (Illite, kaolinite and chlorite) and quartz minerals. This work allows us to produce a map of hydrothermal alteration zones which can be used as a valuable reference in the strategy of mining exploration for the base metals (Cu, Pb, Zn and Ba), in the mining district of Oumjrane-Boukerzia and in the entire Eastern Anti-Atlas.
文摘In film production cinematography is a visual medium that connects the film experience to the viewers.Just like other crew members such as directors and actors,specific names of cinematographers become common in the African film industry.Abebe Ketsela,who has a career spanning many decades and popular designations,is regarded as one of the best intellect cinematographers in Ethiopian cinema.This qualitative content analysis examines his works his cinematography skill emerged from his ability to utilize shot selection,framing,and composition.This qualitative content analysis of Aster film focuses on the Cinematography concept of camera mobility,and lighting techniques to tell the story naturally so.This is the revised transcription of an interview with Abebe Ketsela that took place on September 27th 2021 at the Department of Film Production Studio at Ale-School of Fine Arts and Design,Adds Ababa University,St.marry Avenue,Addis Ababa,Ethiopia,the place where African filmmakers teach film directing,Cinematography,and screenplay writing.The film production Department is the first Film School which is opened in 2015.This place in this site is a vigorous Black African center as film making education school at the level of second Degree and the excremental area of his creative works.The interview spanned three and a half hours and roofed an extensive range of topics,most of which pivoted around:A glimpse on Ethiopian film through a cinematographer of Aster:how his visual creation reveals in his cinematography.
文摘遥感卫星的多光谱数据应用于找矿已取得显著成效,2004年7月中国卫星地面站开始提供ASTER(Advanced Space-borne Thermal Emission and Reflection Radiometer,高级星载热发射反照辐射计)数据,因涵盖波长范围宽[VNIR(Visible and Near Infra-red)、SWIR(Short wave-length Infra-red)、TIR(Thermal Infra-red)]、波段多(14个波段)、性价比合理等因素,ASTER数据的研究迅速发展。长久以来,对覆盖区进行蚀变遥感异常信息提取一直是遥感找矿的关注点之一。笔者等利用ASTER数据对浅覆盖区——包古图斑岩铜矿的Ⅱ号、Ⅴ号斑岩体进行蚀变遥感异常提取,提取的蚀变异常与野外地质情况吻合性好。分别提取了光谱特征谱带差异明显的2组蚀变矿物的异常信息:第一组是蒙脱石、埃洛石、伊利石与绢云母;第二组是方解石、黑云母与绿泥石。提出了需要进一步工作的异常靶区。
