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Verificación de la precisión altimétrica del DSM GF-7 de las laderas costeras de lagos en la provincia de Qinghai y análisis de factores de influencia

  • role： First author第一作者
  • Affiliation：

    Department of Water Resources, China Institute of Water Resources and Hydropower Research, Beijing 100038, China

    Key Laboratory of River Basin Digital Twinning of Ministry of Water Resources, Beijing 100038, China

  • Email：2640725634@qq.com
  • Introduction：张怀文，研究方向为水资源遥感。E-mail： 2640725634@qq.com
ZHANG Huaiwen12,  
  • role： Corresponding author通信作者
  • Affiliation：

    Department of Water Resources, China Institute of Water Resources and Hydropower Research, Beijing 100038, China

    Key Laboratory of River Basin Digital Twinning of Ministry of Water Resources, Beijing 100038, China

  • Email：caoyin@iwhr.com
  • Introduction：曹引，研究方向为水资源遥感。E-mail： caoyin@iwhr.com
CAO Yin12*,  
  • Affiliation：

    Department of Water Resources, China Institute of Water Resources and Hydropower Research, Beijing 100038, China

    Key Laboratory of River Basin Digital Twinning of Ministry of Water Resources, Beijing 100038, China

ZHAO Hongli12,  
  • Affiliation：

    Department of Water Resources, China Institute of Water Resources and Hydropower Research, Beijing 100038, China

    Key Laboratory of River Basin Digital Twinning of Ministry of Water Resources, Beijing 100038, China

JIANG Yunzhong12,  
  • Affiliation：

    Department of Water Resources, China Institute of Water Resources and Hydropower Research, Beijing 100038, China

    College of Hydrology and Water Resources, Hohai University, Nanjing 210024, China

ZHAO Huizi13,  
  • Affiliation：

    Department of Water Resources, China Institute of Water Resources and Hydropower Research, Beijing 100038, China

    School of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China

WANG Rong14,  
  • Affiliation：

    Department of Water Resources, China Institute of Water Resources and Hydropower Research, Beijing 100038, China

    Key Laboratory of River Basin Digital Twinning of Ministry of Water Resources, Beijing 100038, China

XU Haowei12

resumen

El satélite Gaofen-7 (GF-7) puede obtener datos de elevación del terreno de las laderas costeras de los lagos (DSM), con un potencial de aplicación en el monitoreo remoto de variables de almacenamiento de lagos sin observación en terreno. Sin embargo, la complejidad topográfica de los lagos hace que la cuantificación de la precisión altimétrica del GF-7 DSM y los factores que la afectan sea de gran importancia para realizar aplicaciones de monitoreo remoto basadas en GF-7 DSM. Para verificar la precisión altimétrica del GF-7 DSM en las laderas costeras de los lagos, se analizaron datos topográficos de alta precisión de 9 lagos en la provincia de Qinghai, evaluando la precisión altimétrica, estabilidad y los principales factores que afectan la precisión relativa altimétrica. Los resultados muestran errores sistemáticos en el GF-7 DSM de las laderas, baja precisión absoluta de altura, marcada correlación topográfica, pero alta precisión relativa de altura. El error absoluto en la diferencia de altura es generalmente menor a 1.7 m; cuando la pendiente es inferior a 15°, el error absoluto es menor a 1.5 m, pero la precisión disminuye con el aumento de la pendiente. La corrección del GF-7 DSM usando alturas medidas mejora significativamente la precisión absoluta, con un error general menor a 0.85 m, error medio máximo menor a 1.4 m, precisión relativa menor a 1.25 m, y error máximo menor a 1.6 m; después de la corrección, no hay correlación topográfica aparente. La precisión relativa altimétrica depende principalmente de la pendiente del punto base y del cambio de pendiente, siendo el cambio de pendiente el factor principal, con pesos de 0.019 y 0.047, respectivamente. El GF-7 DSM del mismo sitio en diferentes momentos muestra una correlación muy alta, con R² por encima de 0.98. La corrección relativa puede reducir considerablemente los errores sistemáticos de los DSM GF-7 en diferentes momentos, permitiendo la fusión de múltiples imágenes GF-7 para el monitoreo remoto de cambios en el volumen de agua de grandes lagos, ofreciendo gran potencial para el monitoreo remoto de cambios en el almacenamiento de agua de lagos sin observación en el terreno.

palabra clave

GF-7 DSM;verificación de precisión;correlación topográfica;factores de influencia;provincia de Qinghai;terreno medido;laderas costeras de lagos

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