基于FY-3D的江西省夏季地表温度真实性检验

Authenticity Verification of Summer Surface Temperature in Jiangxi Province Based on FY-3D

摘要:

摘要：风云气象卫星在全球防灾减灾方面发挥了重要作用。随着遥感技术的发展和应用领域的拓展，对遥感数据的真实性要求越来越高。本研究利用江西省93个国家基本气象站实测地表温度（GST）小时数据和MYD11A1日产品，考虑了复杂下垫面及云量条件，开展了FY-3D 地表温度（LST）产品的真实性检验和误差分析。结果表明，FY-3D反演的LST与地面GST存在显著的正相关关系（P＜0.001），且FY-3D LST普遍略低于GST，存在明显的低估现象。云覆盖对卫星反演的LST结果影响较大，去云处理后FY-3D反演LST精度明显提高。FY-3D LST与MYD11A在空间分布上具有较高的一致性，但FY-3D LST反演结果较MYD11A1略微偏高，且两种LST产品在水体下垫面差异最大，耕地下垫面差异最小。

Abstract:

Abstract:The Fengyun meteorological satellites play an important role in global disaster prevention and reduction. With the development of remote sensing technology and the expansion of application fields, there is an increasing demand for the authenticity of remote sensing data. In this study, we used hourly data of Ground Surface Temperature (GST) measured by 93 national basic meteorological stations in Jiangxi province and MYD11A1 daily products, as well as considered the complex underlying surface and cloud cover conditions, the authenticity verification and error analysis of FY-3D land surface temperature (LST) products were conducted. The results showed that there was a significant positive correlation (P < 0.001) between the FY-3D LST and the observed GST by meteorological stations, and the FY-3D LST was generally slightly lower than GST, it indicated that there was an obviously underestimation phenomenon. Clouds had a great influence on the LST retrieval results from satellites, and the accuracy of FY-3D LST was significantly improved after cloud removal. FY-3D LST and MYD11A had high consistency in spatial distribution, but the FY-3D LST retrieval results were slightly higher than MYD11A1, besides, the two LST products had the greatest difference in the underlying surface of water bodies and the smallest difference in the underlying surface of cultivated land.