Tatem A J, Noor A M, Hay S I
TALA Research Group, Tinbergen Building, Department of Zoology, University of Oxford, South Parks Road, Oxford, OX1 3PS, UK.
Remote Sens Environ. 2005 May 15;96(1):87-97. doi: 10.1016/j.rse.2005.02.001.
Ninety percent of projected global urbanization will be concentrated in low income countries (United-Nations, 2004). This will have considerable environmental, economic and public health implications for those populations. Objective and efficient methods of delineating urban extent are a cross-sectoral need complicated by a diversity of urban definition rubrics world-wide. Large-area maps of urban extents are becoming increasingly available in the public domain, as are a wide-range of medium spatial resolution satellite imagery. Here we describe the extension of a methodology based on Landsat ETM and Radarsat imagery to the production of a human settlement map of Kenya. This map was then compared with five satellite imagery-derived, global maps of urban extent at Kenya national-level, against an expert opinion coverage for accuracy assessment. The results showed the map produced using medium spatial resolution satellite imagery was of comparable accuracy to the expert opinion coverage. The five global urban maps exhibited a range of inaccuracies, emphasising that care should be taken with use of these maps at national and sub-national scale.
预计全球90%的城市化将集中在低收入国家（联合国，2004年）。这将给这些人口带来重大的环境、经济和公共卫生影响。客观有效的城市范围划定方法是一个跨部门需求，而全球范围内多样的城市定义标准使这一需求变得复杂。大面积的城市范围地图在公共领域越来越容易获取，各种中等空间分辨率的卫星图像也是如此。在此，我们描述了一种基于陆地卫星增强型专题绘图仪（ETM）和雷达卫星图像的方法在肯尼亚人类住区地图制作中的扩展应用。然后，将这幅地图与五幅源自卫星图像的肯尼亚国家级全球城市范围地图进行比较，并与专家意见覆盖范围进行对比以评估准确性。结果表明，使用中等空间分辨率卫星图像制作的地图在准确性上与专家意见覆盖范围相当。这五幅全球城市地图存在一系列不准确之处，强调在国家和次国家层面使用这些地图时应谨慎。
