A method for automatic mapping of the remote sensing monitoring results of national nature reserves based on ArcPy and map optimization
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摘要: 国家级自然保护地遥感监测工作覆盖陆域面积约170万km2, 圈定变化图斑的数量多, 专业性较强, 投入大量人力物力也不易保障制图的正确性和规范性, 影响监测成果应用服务的质量和成效。据此情况, 该文基于ArcPy站点包, 采用Sutherland-Hodgman裁剪等图形学方法, 结合定制的ArcToolbox封装自动制图脚本, 实现读取地理数据库中图斑信息和影像, 自动制作图面优化后的国家级自然保护地变化监测图斑分布图, 累计制图量达5万余张, 正确率为100%。经实践表明: 单张自动制图的平均用时为29.06 s, 远远快于人工制图。所提方法满足实际生产需要, 自动制图脚本较稳定可靠, 且具有较强的普适性, 大大提高了国家级自然保护地变化监测成果的服务应用效率, 具有较强的实际意义。
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关键词:
- 国家级自然保护地监测 /
- ArcPy /
- 遥感影像 /
- Sutherland-Hodgman算法
Abstract: Remote sensing monitoring in national-level nature reserves covers a land area of approximately 1.7 million km2. This process involves the delineation of numerous features that indicate variations in the nature reserves, requiring specialized expertise. As a result, ensuring the accuracy and normalization of mapping is challenging even using substantial human and material resources. This affects the quality and effectiveness of monitoring result applications and relevant services. To address this issue, employing geometric techniques like the Sutherland-Hodgman clipping algorithm based on the ArcPy package, along with the customized ArcToolbox tools for encapsulating automated mapping scripts, this study automatically extracted the information and images of features from a geographic database. Subsequently, this study automatically generated the distribution maps of features that reflected variations in national-level nature reserves. Over 50000 maps were plotted using the proposed method, with an accuracy of 100%. Practical application demonstrates that the automatic mapping for a single map can be completed within 29.06 s on average, significantly less than manual mapping. The proposed method can meet practical production needs, with the automated mapping scripts proving stable, reliable, and widely applicable. The proposed method can significantly enhance the efficiency of the applications of the monitoring results reflecting variations in the national-level nature reserves, holding great practical significance. -
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