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| 1 | Applicability of SRTM data for landform characterisation and geomorphometry: a comparison with contour-derived parameters显示文摘Geomorphologic and hydrologic research heavily depends on digital elevation models(DEM)which are currently being prepared from digital contours.The present study examines the use and applicability of freely available global elevation data source(3 arc seconds finished Shuttle Radar Topography Mission(SRTM))in landform characterisation,geomorphometry,river basin studies and other allied scientific applications in comparison with contour elevation data derived from the surveyed topographical sheets.The relief data extracted from a conventionally digitised geo-information science dataset of topographic contours(1:50,000)are compared with the SRTM-DEM and the variations are analysed.The automated geomorphometric and landform parameters derived from the contour DEM and the computed statistical properties of those parameters have substantial agreement with the same parameters derived from the SRTM-DEM.At the same time,localised variations also exist in some spatial domains.Derivative landscape analysis outputs from the SRTM-DEM suggest the wide acceptability and applicability of the freely available SRTM data source,especially in the regional scale applications related to hydrological modelling,terrain characterisation,disaster management and land degradation studies. | V.Prasannakumar RShiny NGeetha HVijith | 2011 | International Journal of Digital Earth2011，4，5： | 1 |
| 2 | M-LZD算法中表面变形的可探测性分析显示文摘现有的基于LZD方法的DEM变形探测方法都是将表面变形作为粗差,采用不同的稳健估计方法来探测。粗差具有发现和定位能力是粗差探测的前提,而现有方法均没有进行粗差发现和定位能力分析。本文首先采用判断矩阵对其进行了理论分析,然后对结果在不同类型地面的DEM进行了试验。根据试验结果,任意2个判断向量线性无关,判断矩阵中没有零元素,相关数等于多余观测个数。试验结果表明,DEM表面上无论多少粗差均具有发现和定位能力;基于LZD方法的DEM表面变形探测方法在理论上是完备的,可以正确地发现和定位粗差。 | 张同刚 岑敏仪 任自珍 金国清 | 2016 | 测绘通报2016，，6： | 0 |
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