共查询到19条相似文献,搜索用时 93 毫秒
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根据遥感影像中不同光谱波段对不同地物的反射率特征,以西洋河流域2000年春秋两期Landsat7ETM+遥感数据为研究对象,结合实地调查数据,利用地理信息系统及遥感数据处理系统软件平台,建立植被覆盖度对不同季节、不同程度的植被覆盖、岩土裸露及水面水体相关的特征关系、对该流域内分布的各类中小型水库塘坝的水面和水体信息的分析和提取方法进行系统的研究和验证。通过结果分析表明:根据不同时相遥感影像的光谱波段组合建立不同的处理方法可以提高季节性变化的水面及水体信息识别和提取的精度和效率。 相似文献
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《Planning》2016,(2)
遥感找矿在大多植被覆盖区效果并不明显。在重庆高燕锰矿区采用了Landsat 8多光谱遥感数据的植被覆盖区矿化信息提取方法,该方法与传统提取遥感矿化蚀变信息找矿的方法不同,通过提取植被覆盖相对较小的含矿层顶底板岩层的遥感异常,查明含矿层位置。该方法采用特定的膜技术剔除植被、水体、云雪等干扰,再利用比值法在高植被覆盖区提取有价值的遥感蚀变信息,然后将多个波段比的遥感异常进行假彩色合成,再将遥感异常与地质事实结合,最终解译出锰矿含矿层顶底板遥感异常特征,确定找矿线索。 相似文献
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基于MODIS数据的湖泊水体识别 总被引:1,自引:0,他引:1
分析利用MODIS数据提取水体的原理和方法的基础上,以青海湖为例利用MODIS影像数据进行湖泊水体识别,结果精度较好。能够为青海湖的动态变化及其周围环境的研究提供重要豹依据。 相似文献
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Landsat 9是最新发射一颗陆地资源卫星,它将代替Landsat 7与Landsat 8组成新一代Landsat卫星星座,继续长期观测地球的变化。文章主要介绍了新一代陆地观测卫星星座的特征和其在海岸线监测、气候变化与生物多样性研究、极地与冰川监测、全球森林动态监测、水资源监测等领域的应用前景以及下一代Landsat卫星的概况。 相似文献
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探讨了高分辨率遥感提取土地信息的技术,详细地阐述了高分辨遥感技术在城市土地调查与管理和城市交通规划领域中的应用,并对高分辨遥感数据用于城市土地开发利用的效果和影响进行了评价,以促进该技术的应用. 相似文献
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A timely low-cost method providing information on water quality and trophic state to various users of reservoir or dam water is a must. Conventional methods involved tedious and expensive in situ and laboratory studies. Satellite-borne sensors have the capability of providing repetitive, low-cost, multispectra, timely and reliable information over areas. This paper shows the development of a new method for assessing the trophic state in inland water bodies such as dams. The method is based on matching the atmospheric corrected reflectance values obtained from Landsat-5 Thematic Mapper (TM) image data with the defined spectral signature ranges obtained from ground spectro-radiometric measurements in order to assess the trophic state conditions. The proposed method has been applied to Landsat TM and Enhanced Thematic Mapper (ETM) satellite images of the Kourris and Asprokremmos Dams in Cyprus, acquired during the winter, spring, summer and autumn period. The reflectance values for the images acquired on 3 June 1985, 11 September 1998, 11 May 2000 and 31 January 2001 for the Asprokremmos Dam were found to be 4.5, 3.5, 3.7 and 11.2%, and those for the Kourris Dam were found to be 5, 3.5, 3.1 and 5.2%, respectively. Reflectance values between 3 and 7% correspond to a eutrophic state and values >7% to a hypertrophic state. The results obtained from the proposed method were found to comply with those found using the trophic state index (TSI) approach. For example, the trophic state for the Landsat TM images of Asprokremmos Dam acquired on 11 May 2000 and 31 January 2001, was determined to be TSI=68 and 79, respectively, using the available secchi disc depths (SDDs) and the Carlson TSI. Such values correspond to eutrophic and hypetrophic trophic states that comply with the same outcomes found from the proposed method. 相似文献
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对地形切割强烈、海拔较高的地区进行遥感解译,正成为地质基础研究的重要手段。青海文巴地区构造变形复杂,晚古生代以来经历多期隆升和岩浆活动,青藏高原东北缘构造活动具有一定代表性。基于遥感数据OLI,通过OIF指数分析得到R∶G∶B为7∶5∶4的最佳波段组合,然后使用格拉姆—斯密特正交化法对图像融合增强处理。结合研究区已有地质资料,建立解译标志,对断裂构造进行遥感解译。结合野外验证探获断裂26条,主要走向为NW向、NE向、近SN向、近WE向,其中大断裂4条,小断裂22条。这对划分构造期次和进一步找矿工作提供了线索。 相似文献
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Four decades of the morphological dynamics of the lakes in the Jianghan Plain using Landsat observations 下载免费PDF全文
Using four decades of Landsat observations between 1978 and 2014, we documented and studied the long‐term dynamics of the inundation conditions in the Jianghan Plain, Central China. Three morphological factors, including inundation areas, perimeters and shoreline developments (SDs), of the 51 selected lakes were calculated. Significant long‐term morphological changes were found in lakes in the Jianghan Plain. The total area dramatically increased from 838.0 km2 in 1978 to 1200.8 km2 in 1989, and an overall decreasing trend was observed in the later period. The changing patterns of the perimeters and SDs were different from the inundation areas, especially for the largest lake in this area (Honghu). The inconsistent changes between the inundation area and the other two morphological parameters were likely caused by increasing human activities. This study demonstrated the importance of remote sensing in obtaining multi‐decadal lake changes in terms of both the inundation area and the morphological complexity. 相似文献
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康古尔地区位于板块结合带上,韧性剪切带群附近,地质构造复杂,成矿条件优越,具有良好的找矿前景。文章利用ASTER、Landsat8 OLI、SPOT5等多源遥感数据,在分析了研究区实测典型岩性光谱特征的基础上,充分利用多源遥感数据的光谱、空间信息进行不同岩性单元岩性差异的增强与识别提取对比分析研究,提出了一套利用多源遥感数据增强暗色矿物含量不同的岩浆岩岩性单元间的边界划分方法。试验中利用ASTER R(B2/B1)G(B2/B4)B(B8/B9)、Landsat 8 OLI R(B4/B3)G(B4/B6)B(B7)ASTER与SPOT5协同数据R(B2/B1)G(B2/B4)B(B8/B9)比值波段假彩色合成的方法进行岩性差异信息增强,获得的岩性边界与前人地质资料、野外实际调查结果基本吻合,为该地区地质图优化与矿产资源勘查提供重要参考。 相似文献
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基于国内外多种遥感影像数据,对浏阳500 kV输变电工程线路建设期水土保持进行远程监控,通过一系列影像预处理、支持向量机结合人机交互目视解译分类,在遥感影像上提取出水土保持目标,包括塔基扰动面积、施工溜坡挂渣、临时施工道路。遥感影像提取的水土保持信息的精度评估以实测数据为标准,质量不合格的部分继续进行分类,直至全部满足精度要求,最后作为成果输出。实验结果表明,基于多星协同的遥感水土保持远程监控技术方法,能够满足浏阳500 kV输变电工程线路建设期每月一次水土保持远程监控需求,为建立高效文明的500 kV输变电工程线路建设期现场水土保持监控提供有效的技术手段。 相似文献