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Arid Land Geography ›› 2024, Vol. 47 ›› Issue (8): 1367-1379.doi: 10.12118/j.issn.1000-6060.2023.718

• Earth Surface Process • Previous Articles     Next Articles

Evaluation and ensemble learning of remote sensing land-cover products in the Hohhot-Baotou-Ordos-Yulin urban agglomeration

XIA Zilong1,2,3(), DU Peijun1,2,3(), GUO Shanchuan1,2,3, FANG Hong1,2,3, ZHANG Wei1,2,3, PAN Xiaoquan1,2,3   

  1. 1. School of Geography and Ocean Science, Nanjing University, Nanjing 210023, Jiangsu, China
    2. Key Laboratory for Land Satellite Remote Sensing Applications of Ministry of Natural Resources, Nanjing 210023, Jiangsu, China
    3. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, Jiangsu, China
  • Received:2024-02-16 Revised:2024-03-17 Online:2024-08-25 Published:2024-09-02
  • Contact: DU Peijun E-mail:zilongxia@smail.nju.edu.cn;peijun@nju.edu.cn

Abstract:

In recent years, numerous large-scale, medium to high-resolution land-cover products have been produced both domestically and internationally. However, the reliability of these products in arid region urban agglomerations has not been adequately validated. Assessing the spatial consistency and classification accuracy of different products in arid urban agglomerations, and exploring ways to utilize existing data to produce more precise integrated products, can advance and refine relevant research in this region. Based on the five major existing land-cover products [GlobeLand30, GLC_FCS30, CLCD, FROM_GLC30, and ESA WorldCover (ESAWC)], this study analyzed the spatial differences and reliability of these products within the Hohhot-Baotou-Ordos-Yulin (HBOY) urban agglomeration, north China in terms of the similarity of composition type, spatial consistency, and classification accuracy. An effective multi-source product ensemble learning method was proposed, involving the fusion of five land-cover products to generate a novel, integrated land-cover product. The results show that: (1) The overall composition and spatial distribution of land-cover in the HBOY urban agglomeration is similar among the five products. The areas that are completely consistent and highly consistent among different products account for 68.79% of the total area, with grassland having the highest consistency. (2) The overall accuracy of the five products ranged from 67.83% to 76.96%, with the ESAWC product exhibiting the highest overall accuracy (76.96%), followed by GLC_FCS30 (75.34%). All the products demonstrated significant spatial accuracy in depicting ground reality in forests, grasslands, water bodies, and bare ground, with relatively lower accuracy observed in scrubland and wetlands. (3) The proposed product integration scheme harnesses the strengths of existing products and prior knowledge, enabling the integrated application of multiple land-cover products. The new product achieves an overall accuracy of 83.36%, representing an improvement of 6.40% to 15.53% compared to the accuracy of the original products. The results of the study provide valuable references for the selection and production of land-cover products for thematic studies in arid region urban agglomerations.

Key words: land-cover products, spatial consistency analysis, accuracy assessment, integrated application, HBOY urban agglomeration