主办单位:中国气象局沈阳大气环境研究所
国际刊号:ISSN 1673-503X
国内刊号:CN 21-1531/P

Journal of Meteorology and Environment ›› 2024, Vol. 40 ›› Issue (6): 89-97.doi: 10.3969/j.issn.1673-503X.2024.06.011

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Identification and area estimation of soybean planting areas in Heilongjiang province based on multi-temporal MODIS data

Rui SONG1,2(),Hengqian ZHAO2,Wenying YU1,*(),Yifeng YANG2,Zihan LI2   

  1. 1. Institute of Atmospheric Environment, China Meteorological Administration, Shenyang 110166, China
    2. School of Earth Science and Surveying and Mapping Engineering, China University of Mining and Technology, Beijing 100083, China
  • Received:2023-05-27 Online:2024-12-28 Published:2025-01-21
  • Contact: Wenying YU E-mail:song13141011@163.com;yuwenying@iaesy.cn

Abstract:

Multi-temporal MODIS image data of Heilongjiang province from 2017 to 2021 were selected, and based on Google Earth Engine (GEE) geospatial analysis cloud platform, the spectral reflectance of various types of features as well as the difference characteristics of indices such as Normalized Difference Vegetation Index (NDVI) and Normalized Difference Water Index (NDWI) were compared and analyzed.A classification decision tree was established to identify soybean planting areas in Heilongjiang province, estimate the area, and compare with other classification methods.The results show that the total accuracy of estimating the area of soybean planting areas in Heilongjiang province in 2018 identified based on the decision tree classification method is 97.09%, and the Kappa coefficient is 0.77, which is higher than the random forest and support vector machine methods in terms of classification accuracy.By adjusting and optimizing the decision tree model for soybean planting area identification and area estimation in the year without sample, the soybean distribution change in Heilongjiang province from 2017 to 2021 was obtained with a total accuracy of more than 90%, a Kappa coefficient of more than 0.60, and an accuracy of more than 95% for the area estimation results.

Key words: Vegetation index, Water index, Spectral analysis, Decision tree classification

CLC Number: