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首页> 外文会议>CryoSat third user workshop >APPLICATIONS OF CRYOSAT-2 SAR SARIN MODES FOR THE MONITORING OF RIVERWATER LEVELS
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APPLICATIONS OF CRYOSAT-2 SAR SARIN MODES FOR THE MONITORING OF RIVERWATER LEVELS

机译：Cryosat-2 SAR＆SARIN模式在河水水平监测中的应用

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Regarding hydrology applications and particularly the monitoring of river water levels from space, the CryoSat- 2 ice mission has two main valuable characteristics: (1) its geodetic orbit and (2) the altimeter’s SAR and SARin modes. The benefits of the geodetic orbit of the satellite have been illustrated in the frame of the ”20 years of progress in radar altimetry” symposium (Venice, 2012) [2]. It has been shown that, with such an orbit, the way river water level was monitored using conventional altimeters had to be revisited. In particular, using LRM mode only, CryoSat-2 allowed us to build spatio-temporal time series of the river water level, to map river’s topography and eventually derive pseudo-time series and pseudo-profiles of the river. This paper focuses on the new ways to use altimetry for the monitoring of river water levels. SIRAL’s (CryoSat-2 altimeter) SAR and SARin modes have the ability to deliver surface heights with an unprecedented along-track resolution of about 300 m. Moreover, using the SARin mode (involving the satellite’s two antennas), the crosstrack angle of the retracked echo is also available in routine. These two aspects of the SARin mode (high resolution and cross-track angle) make it a new tool to distinguish whether the retracked echo came from the surface of interest (e.g., a river) or any other reflective object nearby the surface of interest (e.g., another river section, lakes or temporary lake after flooding events or any other specular surfaces). We introduce the multiple benefits of using the intermediate multi-look matrix (also known as stack matrix), among them: (1) to refine and select among the multiple Doppler-beam waveforms before averaging and retracking them, and (2) to be able to study the surfaces response according to their view angle. Custom products processed at ESA (ESRIN) by Dinardo et al. [7], in the perspective of Sentinel-3, as well as official CryoSat-2 L1b and L2 products were used to illustrate these perspectives. The paper mainly introduces the potential new applications brought by SIRAL’s SAR and SARin modes. Finally, combined with its really dense geodetic orbit, CryoSat-2 can be seen as a topography mission that paves the way toward the SWOT mission.
机译：关于水文应用，特别是从空间监测河水水平，低温 - 2冰代理有两个主要的有价值特性：（1）其大地轨道和（2）高度计的SAR和SARIN模式。卫星轨道的大地轨道的好处已经在“雷达高铁”研讨会（威尼斯，2012年）[2]的“20年进展”框架中。已经表明，通过这种轨道，必须重新审视使​​用常规高度测量监测河水水平的方式。特别是，仅使用LRM模式，Cryosat-2允许我们建立河水水平的时空时间序列，以映射河流的地形，最终获得河流的伪时间序列和伪型材。本文重点介绍使用Altimetry以监测河水水平的新方法。 Siral（Cryosat-2高度计）SAR和SARIN模式具有沿着轨道分辨率的前所未有的约300米的沿着前所未有的表面高度。此外，使用Sarin模式（涉及卫星的两个天线），运载回波的Crosstrack角度也可在常规中获得。 Sarin模式（高分辨率和交叉轨道角度）的这两个方面使其成为一种新的工具，以区分被再磨损的回声来自感兴趣的表面（例如，河流）或附近感兴趣的表面附近的任何其他反射物体（例如，洪水发生后的另一个河段，湖泊或临时湖泊或任何其他镜面）。我们介绍使用中间多功能矩阵（也称为堆栈矩阵）的多个优势：（1）在平均和再生之前在多个多普勒光束波形中进行完善和选择，并将其归因于（2）能够根据其视角来研究表面响应。 Dinardo等人在ESA（ESRIN）处理的定制产品。 [7]，在Sentinel-3的角度下，以及官方冷冻剂-2L1B和L2产品用于说明这些观点。本文主要介绍了SIRAL SAR和SARIN模式带来的潜在的新应用。最后，结合其真正密集的大地测量轨道，低温呢-2可以被视为铺平道脚的地形使命。

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