摘要:
塔吉克帕米尔地区地处高寒地区,地质研究程度整体相对较低,缺乏完整的1:5万和1:10万地形资料,兼之塔吉克保护性政策较强,对外开放程度不够,难以获得大比例尺的地形资料.因此,在塔吉克开展1:25万区域化探工作,地形等基础资料成为亟待解决的关键的问题.针对上述存在问题,开展了专题研究工作.研究基于ASTER-GDEM高程数据,通过ARCGIS9平台,对DEM数据进行一系列处理,实现了地形、河网水系的提取,数据经度25m.利用境内已有1:5万地形资料与同一地区利用该方法提取的地(水系)资料进行了对比,结果表明,利用GDEM数据提取的地形(水系)资料是可靠的,其精度接近于1:5万地形图精度,满足了开展1:25万区域化探工作的精度要求,从而成功解决了在塔吉克境内开展化探工作地形资料匮乏问题.在缺乏境外地形资料的情况下,无疑为快速开展境外地区相关地质调查研究工作提供一种新的、快速有效的技术方法和手段.
Abstract:
Pamir, in Tajikistan, located in alpine region, relatively lower geological researching level, lacks complete topographies with the scale of 1 to 50 000 and 1 to 100 000. Tajikistan has power protective policies, obtaining large scale topography data is very difficult, so to carry on regional geochemical survey topography data with scale of 1 to 250 000 has become the first key problem. According to the above matter, the project carries on monographic studies. Based on the ASTER-GDEM elevation data, platform of ARCGIS 9.0, disposing DEM data, we successfully extracted the topography and water system with the accuracy of 25 m. At the same time, the comparison between the extracted data and actual data indicates that the topographic data extracted is reliable and credible, and the accuracy is close to the scale of 1 to 50000. And finally the problem encountered above was solved, a new, quick and effective method for abroad geological survey is provided.Pamir, in Tajikistan, located in alpine region, relatively lower geological researching level, lacks complete topographies with the scale of 1 to 50 000 and 1 to 100 000. Tajikistan has power protective policies, obtaining large scale topography data is very difficult, so to carry on regional geochemical survey topography data with scale of 1 to 250 000 has become the first key problem. According to the above matter, the project carries on monographic studies. Based on the ASTER-GDEM elevation data, platform of ARCGIS 9.0, disposing DEM data, we successfully extracted the topography and water system with the accuracy of 25 m. At the same time, the comparison between the extracted data and actual data indicates that the topographic data extracted is reliable and credible, and the accuracy is close to the scale of 1 to 50000. And finally the problem encountered above was solved, a new, quick and effective method for abroad geological survey is provided.
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