Percentage canopy cover – using Landsat imagery to delineate habitat for Myanmar's endangered Eld's deer (Cervus eldi)
Percentage canopy cover – using Landsat imagery to delineate habitat for Myanmar's endangered Eld's deer (Cervus eldi)
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DOI：
10.1017/s1367943005002209
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发表时间：
2005-08
影响因子：
3.4
通讯作者：
Kevin Koy;W. McShea;P. Leimgruber;B. Haack;M. Aung
中科院分区：
文献类型：
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作者：
Kevin Koy;W. McShea;P. Leimgruber;B. Haack;M. Aung
来自Landsat Enhanced Thematic Mapper （ETM+）传感器数据的林冠覆盖百分比数据，经过实地测量验证，为描绘缅甸坡鹿（Cervus eldi）栖息地提供了一个有用的工具。目前坡鹿栖息地的范围和状况尚不清楚，但该物种更喜欢干燥的双龙果林。这种生境类型的冠层覆盖度变化很大，传统的遥感技术无法准确描绘。基于树冠覆盖率估算的新地图比严格分类的栖息地地图更准确地反映了干龙脑林的变化。超过500个林冠覆盖的野外测量数据用于训练Landsat ETM+数据，这些数据使用回归-树分析进行分析。将基于卫星的冠层覆盖度估计值与一组独立的现场验证点进行比较（r=0.539， P<0.001, n=114）。基于卫星的估计也显示出预测坡鹿存在的潜力（r=0.636， P<0.01, n=14）。预测图的结果与先前的实地研究一致，表明该物种更喜欢茂密、干燥的龙脑树森林。整个研究区域的树冠覆盖率与人口密度呈负相关（r= - 0.307， P<0.001, n=223），表明如果人口继续增长，麋鹿种群可能面临进一步的威胁。
Percentage canopy cover data derived from Landsat Enhanced Thematic Mapper (ETM+) sensor data, validated with field measurements, provide a useful tool for delineating Myanmar's Eld's deer (Cervus eldi) habitat. The current extent and condition of remaining Eld's deer habitat is unknown, but the species prefers dry dipterocarp forest. This habitat type has widely varying canopy cover and cannot be accurately delineated with traditional remote sensing techniques. New maps based on estimates of percentage canopy cover represent the variability of dry dipterocarp forests more accurately than maps of strict classes of habitat. Over 500 field measurements of canopy cover were used to train Landsat ETM+ data that were analysed with regression‐tree analysis. The resulting satellite‐based estimates of canopy cover were compared with an independent set of field validation points (r=0.539, P<0.001, n=114). The satellite‐based estimates also showed potential for predicting the presence of Eld's deer (r=0.636, P<0.01, n=14). The results from the predictive maps are in accordance with previous field studies demonstrating the species' preference for dense, dry dipterocarp forest. Patterns of percentage tree‐canopy cover across the study area were negatively correlated with human population density (r=‐0.307, P<0.001, n=223), suggesting potential further threats to Eld's deer populations if the human population continues to grow.