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首页> 外文会议>Conference on Earth Observing Systems VII, Jul 7-10, 2002, Seattle, USA >Preparation of GLI-MERIS-AATSR inter-calibration using selected snow and ocean ground sites
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Preparation of GLI-MERIS-AATSR inter-calibration using selected snow and ocean ground sites

机译：使用选定的雪地和海洋地面地点准备GLI-MERIS-AATSR相互校准

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To deliver high quality data sets to the user community, space sensors have to be calibrated with high accuracy. Besides pre-launch and on-board calibration, there exists the possibility to inter-compare the sensor data using well-characterized ground sites. To cover different radiometric signal levels, ground sites with high and low spectral reflectance (and surface temperatures) were chosen to allow not only an absolute signal comparison, but also an estimation of the linearity of the sensor signal. This is why one ground site is located at in the dark ocean (East china sea), and the other is a fresh snow site in the polar region (alternating: Arctic and Antarctic cal sites). These polar sites have the advantage to compare sensors from different sun-synchronous orbit satellites platforms on the same day, i.e. semi-simultaneous measurements can be performed. The dark ocean site will be located near Ishigaki Island (Japan) at 24°37′N and 123°27′E using optical buoy data and frequent in-situ measurements. The snow target sites are in the Antarctic and Arctic, where measurements will be carried out in the polar autumn and spring near Syowa Station (East Ongul Island, Luetzow-Holm Bay, East Antarctica; 69°S and 39°35′E) and near Barrow (Alaska, USA; 71°16′N, 156°50′W). In the scope of the project the ground sites will be characterized (depending on logistical and weather conditions), to allow an estimation of the TOA signal, which will be calculated using either developed codes or generated products. After systematic (space sensor and ground-truth) data acquisition and analysis, a comparison between these space sensors will be provided to assess long-term variations and trends in the calibration. This paper describes the ongoing preparation (e.g., data selection, ground truth measurements and algorithm development) for a systematic inter-sensor comparison of the GLI and MERIS / AATSR sensors, which are onboard of ADEOS-2 and ENVISAT satellites.
机译：为了向用户社区提供高质量的数据集，必须高精度校准空间传感器。除了预启动和车载校准外，还可以使用特征明确的地面位置对传感器数据进行相互比较。为了覆盖不同的辐射信号电平，选择了具有高光谱反射率和低光谱反射率（以及表面温度）的地面站点，不仅可以进行绝对信号比较，还可以估计传感器信号的线性。这就是为什么一个地面站点位于黑暗的海洋（华东海），而另一个地面站点位于极地地区的一个新雪站点（交替：北极和南极加州站点）的原因。这些极地站点的优势是可以在同一天比较来自不同太阳同步轨道卫星平台的传感器，即可以执行半同时测量。利用光学浮标数据和频繁的现场测量，该暗海站点将位于日本石垣岛附近的北纬24°37′和东经123°27′。降雪的目标地点在南极和北极，将在极地秋和春季在Syowa站（东昂古尔岛，南极Luetzow-Holm湾，南极东部； 69°S和39°35′E）附近进行测量。靠近巴罗（美国阿拉斯加州； 71°16′N，156°50′W）。在项目范围内，将对地面站点进行特征化（取决于后勤和天气条件），以便估算TOA信号，该信号将使用开发的代码或生成的产品进行计算。在系统（空间传感器和地面真相）数据采集和分析之后，将提供这些空间传感器之间的比较，以评估校准的长期变化和趋势。本文介绍了正在进行的准备工作（例如数据选择，地面真相测量和算法开发），以便对ADEOS-2和ENVISAT卫星上的GLI和MERIS / AATSR传感器进行系统的传感器间比较。

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