Investigating the Performance of the Jason-2/OSTM Radar Altimeter over Lakes and Reservoirs
Investigating the Performance of the Jason-2/OSTM Radar Altimeter over Lakes and Reservoirs
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DOI：
10.1080/01490419.2010.488983
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发表时间：
2010-01-01
期刊：
影响因子：
1.6
通讯作者：
Beckley, B.
中科院分区：
文献类型：
--
作者：
Birkett, C. M.;Beckley, B.
许多内陆水调查利用档案和近实时雷达测高数据，使地表水位的变化观测。采用多高度计的方法可以提高空间分辨率，使观测更具全球性，长期观测相结合可以改进统计分析。所有方案的核心是对每种仪器进行性能评估。在这里，我们专注于数据的数量和质量有关的波塞冬-3雷达高度计机载杰森-2/OSTM卫星。利用临时数据集（IGDR），研究表明，新的车载DIODE/中位数和DIODE/DEM跟踪模式表现良好，采集和维护大部分湖泊和水库表面在不同的地形。20赫兹的沿航迹数据分辨率，特别是从冰重跟踪算法的范围输出的可用性，也提高了有效的高度测量的数量。基于测试情况下的湖泊和水库，从冰retracker算法的输出也被认为是有一个明显的优势，海洋retracker具有更好的高度稳定性，在平静和结冰的表面，更大的能力，以获得海岸线沃茨，和较低的灵敏度损失的水面时，有岛屿污染的雷达回波。这种机载跟踪和后处理重跟踪使得在穿越海岸线之后能够快速获得湖泊沃茨。值的范围可以从
Many inland water investigations utilize archival and near-real time radar altimetry data to enable observation of the variation in surface water level. A multialtimeter approach allows a more global outlook with improved spatial resolution, and combined long-term observations improve statistical analyses. Central to all programs is a performance assessment of each instrument. Here, we focus on data quantity and quality pertaining to the Poseidon-3 radar altimeter onboard the Jason-2/OSTM satellite. Utilizing an interim data set (IGDR), studies show that the new on-board DIODE/median and DIODE/DEM tracking modes are performing well, acquiring and maintaining the majority of lake and reservoir surfaces in varying terrains. The 20-Hz along-track resolution of the data, and particularly the availability of the range output from the ice-retracker algorithm, also improves the number of valid height measurements. Based on test-case lakes and reservoirs, output from the ice-retracker algorithm is also seen to have a clear advantage over the ocean-retracker having better height stability across calm and icy surfaces, a greater ability to gain coastline waters, and less sensitivity to loss of water surface when there is island contamination in the radar echo. Such on-board tracking and postprocessing retracking enables the lake waters to be quickly gained after coastline crossing. Values can range from