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Método de normalização do ângulo de incidência do coeficiente de retrodispersão da Groenlândia baseado em imagens Sentinel-1 de órbitas ascendentes e descendentes

  • role： First author第一作者
  • Affiliation：

    School of Geospatial Engineering and Science, Sun Yat-sen University, and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, China

  • Email：chenx687@mail2.sysu.edu.cn
  • Introduction：陈晓，研究方向为极地遥感。E-mail： chenx687@mail2.sysu.edu.cn
CHEN Xiao,  
  • role： Corresponding author通信作者
  • Affiliation：

    School of Geospatial Engineering and Science, Sun Yat-sen University, and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, China

  • Email：ligang57@mail.sysu.edu.cn
  • Introduction：李刚，研究方向为微波遥感。E-mail： ligang57@mail.sysu.edu.cn
LI Gang*,  
  • Affiliation：

    School of Geospatial Engineering and Science, Sun Yat-sen University, and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, China

CHEN Zhuoqi,  
  • Affiliation：

    School of Geospatial Engineering and Science, Sun Yat-sen University, and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, China

JU Qi,  
  • Affiliation：

    School of Geospatial Engineering and Science, Sun Yat-sen University, and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, China

ZHENG Lei,  
  • Affiliation：

    School of Geospatial Engineering and Science, Sun Yat-sen University, and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, China

CHENG Xiao

Resumo

O coeficiente de retrodispersão das imagens de Radar de Abertura Sintética (SAR) está intimamente relacionado com o ângulo de incidência das ondas eletromagnéticas e as características da superfície terrestre. Portanto, ao utilizar imagens SAR de banda larga para estudar a capa de gelo da Groenlândia, deve-se corrigir o efeito do ângulo de incidência no sinal de retrodispersão. Atualmente, o algoritmo dominante para correção do ângulo de incidência na superfície da capa de gelo é o método do plano cosseno, que assume que a superfície de neve e gelo é um corpo lambertiano para corrigir o coeficiente de retrodispersão das imagens SAR, mas assumir que o gelo é um corpo lambertiano é claramente inadequado. Este artigo propõe um algoritmo de correção do coeficiente de retrodispersão baseado em regressão linear, que assume que as características de retrodispersão das imagens Sentinel-1 de dupla polarização da capa de gelo da Groenlândia adquiridas quase simultaneamente permanecem constantes, e que a diferença nos coeficientes de retrodispersão está relacionada apenas à diferença do ângulo de incidência. Ao encontrar a relação quantitativa entre o coeficiente de retrodispersão e o ângulo de incidência, obtêm-se coeficientes de retrodispersão normalizados das imagens SAR de dupla polarização. Considerando que as características de retrodispersão da superfície de neve e gelo da capa de gelo da Groenlândia diferem conforme as estações do ano e a altitude, este artigo introduz dois parâmetros, altitude e estação, para estimar os coeficientes de correção normalizados sob diferentes condições sazonais e altitudinais. A aplicação do método de correção proposto às imagens Sentinel-1 da Groenlândia mostrou que o método proposto é superior ao método do plano cosseno para a correção de imagens com polarização co-polarizada, enquanto que a correção das imagens com polarização cruzada é semelhante ao método do plano cosseno. O método de correção proposto neste estudo pode corrigir melhor o coeficiente de retrodispersão das imagens SAR de banda larga Sentinel-1 da capa de gelo da Groenlândia, reduzindo a incerteza nas aplicações subsequentes.

Palavras-chave

sensoriamento remoto; normalização do coeficiente de retrodispersão; ângulo de incidência; Sentinel-1; capa de gelo da Groenlândia; radar de abertura sintética; criosfera; geleira; mosaico de imagens

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