Studie zur Extraktion von Langzeit-Terrassenfeldern basierend auf Landsat-Bildern und dem LandTrendr-Algorithmus – am Beispiel des San du-Flussbeckens in der Provinz Gansu

  • role: First author第一作者
  • Affiliation:

    School of Computer Science, China University of Geosciences, Wuhan 430078, China

    State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100101, China

  • Email:liyifan202401@163.com
  • Introduction:黎一帆,研究方向为遥感信息智能提取。E-mail: liyifan202401@163.com
LI Yifan12,  
  • role: Corresponding author通信作者
  • Affiliation:

    School of Computer Science, China University of Geosciences, Wuhan 430078, China

    State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100101, China

  • Email:wubf@aircas.ac.cn
  • Introduction:吴炳方,研究方向为农业与生态遥感。E-mail: wubf@aircas.ac.cn
WU Bingfang12*,  
  • Affiliation:

    State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100101, China

TIAN Fuyou2,  
  • Affiliation:

    Soil and Water Conservation Monitoring Center of the Ministry of Water Resources, Beijing 100053

CHANG Shengwei4,  
  • Affiliation:

    State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100101, China

    University of Chinese Academy of Sciences, Beijing 100049, China

ZHAO Dan23,  
  • Affiliation:

    State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100101, China

    University of Chinese Academy of Sciences, Beijing 100049, China

ZHANG Miao23,  
  • Affiliation:

    School of Computer Science, China University of Geosciences, Wuhan 430078, China

FAN Runyu1,  
  • Affiliation:

    Qilu Aerospace Information Research Institute, Ji'nan 250132

HU Shuo5

Resümee

Terrassenfelder sind als wichtige landwirtschaftliche Landschaft von großer Bedeutung für die Steigerung der Erträge und den Boden- und Wasserschutz. Zeitlich-räumliche Veränderungsdaten der Terrassenfelder sind eine wichtige Grundlage zur Bewertung der Produktionseffizienz und der ökologischen und hydrologischen Effekte der Terrassen, sind jedoch schwer zu erlangen. Dieser Artikel stellt eine Methode zur Extraktion von Terrassenfeldern aus Langzeit-Zeitreihendaten basierend auf einem Veränderungserkennungsalgorithmus vor. Unter Verwendung von langzeitlichen Satellitenbildserien der Landsat-Reihe mit Fusion des panchromatischen Bands wurden die Daten von Landsat 7 ETM+ und Landsat 8 OLI normalisiert, um Störungen und Verzerrungen zwischen verschiedenen Sensoren zu entfernen; basierend auf der Verteilungskarte der Terrassen von 2020 wurde mit dem datengestützten LandTrendr-Veränderungserkennungsalgorithmus die zeitliche und räumliche Verteilung der Terrassen im Einzugsgebiet des San du-Flusses von 2001 bis 2020 extrahiert und die Beziehung zwischen Terrassenfläche und Getreideertrag analysiert. Die Ergebnisse zeigen, dass die Gesamtüberwachungsgenauigkeit der zeitlichen Terrassen im Einzugsgebiet des San du-Flusses 82,50% beträgt und der F1-Score 0,84 erreicht. Die Gesamtfläche der Terrassen im Einzugsgebiet des San du-Flusses ist im Jahr 2020 im Vergleich zu 2001 um 397 km² oder 45,27% gewachsen. Vor 2015 erreichte die Wachstumsrate der Terrassen ihren Höhepunkt, danach verlangsamte sich das Wachstum, aber der allgemeine Trend ist weiterhin steigend. Es besteht eine sehr enge Beziehung zwischen der Terrassenfläche und der Getreideproduktion (R²=0,94). Durch die Fusion der Landsat-Langzeit-Satellitendaten mit dem LandTrendr-Veränderungserkennungsalgorithmus konnten genaue Informationen zur zeitlich-räumlichen Verteilung der Terrassen gewonnen werden, die die dynamische Entwicklung der Terrassenbauwerke in zeitlicher und räumlicher Dimension sowie die Produktionseffizienz effektiv aufzeigen.

Schlüsselwort

Terrassenkartierung; sequenzielle Extraktion; Landsat; Veränderungserkennung; LandTrendr

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