Kruger National Park ecological aerial survey data (1998-2012)

From the late 1970's the KNP made use of aerial surveys to estimate ungulate populations in the KNP. In the beginning the entire KNP was subdivided in smaller blocks and the entire area was covered. This method was very time and labour intensive, expensive and the estimates had no confidence intervals associated with them. It was also suspected that this technique resulted in an undercount bias. For these reasons in 1997 it was decided to change to a sample count using transects placed from east to west and use the distance statistical method to analyse the data. There was no survey in 2009 or in 2011自20世纪70年代末起，克鲁格国家公园（Kruger National Park，KNP）便采用航空调查手段估算园内有蹄类动物的种群数量。最初，该公园全境被划分为若干小型调查区块，对全部区域开展了全覆盖调查。该方法不仅耗时耗力、成本高昂，且所得种群估算值未附带对应的置信区间；此外，该调查技术还被推测存在漏计偏差。基于上述原因，公园于1997年决定改用东西向布设样带的抽样调查法，并采用距离统计分析法对调查数据开展处理与分析。2009年与2011年未开展相关航空调查。