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首页> 外文期刊>International journal of remote sensing >Mapping Volcano Topography With Remote Sensing: Aster Vs. Srtm
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Mapping Volcano Topography With Remote Sensing: Aster Vs. Srtm

机译:用遥感绘制火山地形图:Aster与Vs. SRTM

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摘要

High spatial resolution topographic data arc crucial as a prerequisite for evaluating and modelling volcanic hazards. Remote sensing now provides some of the best methods of retrieving digital elevation models (DEMs) over extensive volcanic regions. Here we compare the advantages and limitations of Shuttle Radar Topography Mission (SRTM) DEMs, derived from radar interferometry, and Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) DEMs, derived from digital photogrammetry. Applications are presented for Mauna Kea (MK), Hawaii and Oldoinyo Lengai (OL), Tanzania. We quantitatively assess the accuracy of the respective DEMs to document the size of moderate-sized volcanic features. ASTER DEM accuracy depends on spectral contrast within the image and on the availability of high-quality ground control points. Unlike the ASTER DEMs, which are user-derived, processed SRTM DEMs are provided without estimations of the vertical accuracy for each scene, and the end-user has no control over the processing method. From comparison with a 10-m spatial resolution DEM derived from 1 : 24000 scale topographic maps of MK, we estimate root mean square errors at 8, 10 and 13 m for SRTM 30-m, SRTM 90-m and ASTER 30-m DEMs, respectively. For scoria cones (<200m high, <2km basal diameter), SRTM 30-m, SRTM 90-m and ASTER 30-m DEMs underestimate cone height by 9.5, 27 and 14%, respectively, mostly because of the averaging effect of decreasing spatial resolution. For height estimations of volcanic features higher than ~ 100m in the OL region, all of the DEMs tested were found to be consistent.
机译:高空间分辨率的地形数据对于评估和建模火山灾害至关重要。遥感现在提供了在广阔的火山区域上检索数字高程模型(DEM)的一些最佳方法。在这里,我们比较了从雷达干涉测量法得出的穿梭雷达地形任务(SRTM)DEM和从数字摄影测量法得出的先进星载热发射与反射辐射计(ASTER)DEM的优缺点。提出了针对夏威夷的莫纳克亚山(MK)和坦桑尼亚的Oldoinyo Lengai(OL)的应用程序。我们定量评估各个DEM的准确性,以记录中型火山特征的大小。 ASTER DEM精度取决于图像内的光谱对比度以及高质量地面控制点的可用性。与用户衍生的ASTER DEM不同,所提供的经过处理的SRTM DEM无需估计每个场景的垂直精度,并且最终用户无法控制处理方法。通过与从MK的1:24000比例尺地形图得出的10-m空间分辨率DEM进行比较,我们估计SRTM 30-m,SRTM 90-m和ASTER 30-m DEM的均方根误差为8、10和13 m , 分别。对于渣锥(高<200m,基径<2km),SRTM 30-m,SRTM 90-m和ASTER 30-m DEM分别低估了锥高9.5%,27%和14%,这主要是由于减小的平均作用空间分辨率。对于OL地区高于〜100m的火山特征的高度估计,发现所有测试的DEM都是一致的。

著录项

  • 来源
    《International journal of remote sensing》 |2008年第22期|p.6515-6538|共24页
  • 作者

    M; KERVYN; G; G; J; ERNST; R; GOOSSENS; P; JACOBS;

  • 作者单位

    Mercator and Ortelius Research Centre for Eruption Dynamics, Department of Geology and Soil Sciences, Ghent University, Krijgslaan 281/S8, B-9000 Ghent, Belgium;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 遥感技术;
  • 关键词

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