基于空天地多源数据的大型食草动物调查与种群密度估算研究进展
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第三次新疆综合科学考察(2021xjkk1402);国家自然科学基金(41501416);国家重点研发计划项目(2021YFD1300501,2021YFF0704400)


Research progress on large herbivore surveys and population density estimation based on spaceborne, airborne, and terrestrial multi-source datasets
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    摘要:

    精确实时的大型野生食草动物和家畜调查数据是开展野生动物保护、发展现代畜牧业和草原生态文明建设的基础。研究通过文献方式总结和归纳了目前主要的大型野生食草动物和家畜调查方法,包括地面调查法、卫星调查法、有人机调查法和无人机调查法涉及的设备、数据类型、分辨率、覆盖范围、调查物种;分析了现有大型食草动物智能识别算法、区域种群数量估算方法的优势和缺点;探讨了大型野生食草动物和家畜调查所涉及的不同调查平台、智能识别算法、区域种群密度估算方法等方面研究存在的问题,并对未来研究方向进行了展望。研究认为融合多平台、多传感器数据对构建大尺度、长时序动物数据集至关重要。未来有必要针对食草动物分布密集、目标小的问题研发高精度识别模型,发展基于机器学习的区域种群密度估算方法,揭示区域种群密度与气象、地形等环境因子之间的复杂关联关系。

    Abstract:

    Surveying large wild herbivores ( > 0.6 m) and livestock is the basis for the protection of wild animals, the development of modern animal husbandry and grassland ecological civilization construction. This research systematically reviews the main survey methods of large wild herbivores and livestock, including terrestrial surveys, spaceborne surveys, manned aerial surveys, unmanned aircraft system (UAS) surveys, and focuses on the devices used, data type, data resolution, coverage, and surveyed species. Further, the advantages and disadvantages of different identification algorithms and regional population estimation methods for large herbivores are analyzed. Finally, some problems related to the survey methods, identification algorithms and regional population estimation methods for wild herbivores and livestock surveys are discussed, and some future research directions are suggested. The research finds that submeter very-high-resolution (VHR) spaceborne imagery has potential in modeling the population dynamics of large wild animals at large spatial and temporal scales, but has difficulty discerning small-sized ( < 0.6 m) animals at the species level, although very-high-resolution commercial satellites, such as WorldView-3 and -4, have been able to collect images with a ground resolution of up to 0.31 m in panchromatic mode. UAS surveys are seen as a safe, convenient and less expensive alternative to ground-based and conventional manned aerial surveys for detecting animals and their body features, but most UASs can cover only small areas occasionally. This situation will not change unless the endurance is greatly improved and UAS with docks are widely applied in the future. Docks allow UASs to land, recharge, take off, and execute missions by remote control, thus the data can be acquired with the higher frequencies compared with conventional UASs. The data fusion of multi-platforms and multi-sensors is helpful for producing large-scale and long-time animal data sets. It is necessary to develop high-precision models for detecting dense and small herbivores, estimate population density at a regional scale based on machine learning, and reveal the complex correlation between regional population density and environmental factors such as meteorology and terrain. To synchronously obtain multi-source and multi-scale animal data and verify remote sensing products, a national-scale UAS remote sensing observation network needs to be built to fill the scale gaps between satellites and ground quadrats. Real-time satellite and UAS connectivity software and hardware modules should be developed for quickly acquiring and processing animal data so as to build a smooth channel to connect data and users, and this will fully leverage the value of satellite and airborne data in future for biodiversity monitoring.

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王东亮.基于空天地多源数据的大型食草动物调查与种群密度估算研究进展.生态学报,2025,45(5):2025~2041

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