检索条件"作者=SHAO ZhenFeng,li DeRen & ZHU XianQiang state key laboratory for information engineering in surveying,mapping and remote sensing,wuhan university,129 Luoyu Road,wuhan 430079,china"
The Asian elephant(Elephas maximus)-the largest living land animal in Asia-is categorized as an endangered species according to the International Union for Conservation of Nature(IUCN)Red list and is listed in the Con...
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The Asian elephant(Elephas maximus)-the largest living land animal in Asia-is categorized as an endangered species according to the International Union for Conservation of Nature(IUCN)Red list and is listed in the Convention on International Trade in Endangered Species of Wild Fauna and Flora(CITES)Appendix I[1].Over the past 100 years,the range of the Asian elephant has declined by as much as 90%[2].At present,the Asian elephant inhabits forest-dominated habitat in only 13 countries across South and Southeast Asia(Fig.S1 online),and the IUCN Species Survival Commission(SSC)Asian Elephant Specialist Group(AsESG)estimated the global wild population size of Asian elephants to number 45,671-49,028 individuals[3].Forest habitat loss,along with human-elephant conflict,poaching and the illegal trade in ivory and elephant body parts,is weakening global conservation efforts towards the recovery of wild Asian elephant populations at local,national and range-wide scales[3,4].
利用CYGNSS(cyclone global navigation satellite system)采集的GNSS卫星反射信号,提出一种基于星载GNSS-R的水体分布探测方法。首先对CYGNSS低轨卫星星座采集的GNSS反射信号进行处理,获取地表反射率数据;再按0.01°×0.01°的空间分...
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利用CYGNSS(cyclone global navigation satellite system)采集的GNSS卫星反射信号,提出一种基于星载GNSS-R的水体分布探测方法。首先对CYGNSS低轨卫星星座采集的GNSS反射信号进行处理,获取地表反射率数据;再按0.01°×0.01°的空间分辨率将研究区划分为格网,剔除异常值和无效值后,利用区域均值算法重新计算各格网的反射率,并利用格网样本方差和标准差作为衡量指标,采用随机游走图像分割算法进行水体分布探测;最后利用本文提出的方法分析刚果盆地的水体分布情况,并利用MODIS数据对结果进行评估。结果表明,星载GNSS-R具有较强的水体分布探测能力,进一步拓展了GNSS-R的应用场景。
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