Quality Assessment of the TanDEM-X Global Digital Elevation Model
Quality Assessment of the TanDEM-X Global Digital Elevation Model
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发表时间：
2015-05
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通讯作者：
Benjamin Bräutigam;M. Martone;P. Rizzoli;Carolina González;Christopher Wecklich;M. Bachmann;D. Schulze;M. Zink
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作者：
Benjamin Bräutigam;M. Martone;P. Rizzoli;Carolina González;Christopher Wecklich;M. Bachmann;D. Schulze;M. Zink
TanDEM-X是一项创新的合成孔径雷达（SAR）使命，主要目标是生成地球陆地的全球均匀数字高程模型（DEM）。最终的DEM产品将在分辨率和质量方面达到一个新的细节维度。在像素间距为12 m时，在90%置信区间内，绝对水平和垂直精度均应小于10 m。TanDEM-X使命的垂直高度规格预计，在1°经度× 1°纬度单元内，主要地形坡度小于20%（大于20%）的区域，90%的点对点误差为2米（4米）。全球DEM是由两个雷达卫星在近轨道编队飞行，距离约500米的干涉SAR采集。在整个使命期间，对干涉测量性能参数，如每个拍摄场景的两个雷达图像之间的相干性进行了监测和评价。本文将讨论派生的质量统计数据，并提出全球性能图。TanDEM-X使命概念预计将在2014年底之前获得多个陆地覆盖范围。在进一步的步骤中，超过500，000个单一的SAR场景被干涉处理，校准和镶嵌成一个全球DEM产品。到2014年底，全球约40%的DEM将可用，预计2016年初全部交付。本文将介绍最终DEM产品的相对和绝对高度精度的第一质量的例子。
TanDEM-X is an innovative synthetic aperture radar (SAR) mission with the main goal to generate a global and homogeneous digital elevation model (DEM) of the Earth’s land masses. The final DEM product will reach a new dimension of detail with respect to resolution and quality. The absolute horizontal and vertical accuracy shall each be less than 10 m in a 90% confidence interval at a pixel spacing of 12 m. The vertical height specification for the TanDEM-X mission foresees a 90% point-to-point error of 2 m (4 m) for areas with predominant terrain slopes smaller than 20% (greater than 20%) within a 1° longitude by 1° latitude cell. The global DEM is derived from interferometric SAR acquisitions performed by two radar satellites flying in close orbit formation at distances of around 500 m. Interferometric performance parameters like the coherence between the two radar images per acquired scene have been monitored and evaluated throughout the mission. The paper will discuss the derived quality statistics and present global performance maps. The TanDEM-X mission concept foresees multiple coverages of the land masses which will be acquired by end of 2014. In a further step, the over 500,000 single SAR scenes are interferometrically processed, calibrated, and mosaicked into a global DEM product. By end of 2014, about 40% of the global DEM will be available with the full delivery expected early 2016. This paper will present first quality examples of the final DEM product in terms of relative and absolute height accuracy.