The objectives are to (1) quantify, map, and analyze vegetation cover distributions and changes across Accra, Ghana, for 2002 and 2010; and (2) examine the statistical relationship between vegetation cover and a housing quality index (HQI) for 2000 at the neighborhood level. Pixel-level vegetation cover maps derived using threshold classification of 2002 and 2010 QuickBird normalized difference vegetation index images have very high overall accuracies and yield an estimate of 5.9 percent vegetation cover reduction over the study area between 2002 and 2010. A high degree of variance in vegetation cover for individual dates is explained by HQI at the neighborhood level, although minimal covariability between absolute or relative vegetation cover change and HQI for 2000 was observed.

中文翻译：

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加纳阿克拉的城市植被覆盖和植被变化：与住房质量的联系

目标是 (1) 量化、绘制和分析 2002 年和 2010 年加纳阿克拉的植被覆盖分布和变化；(2) 检验 2000 年邻里植被覆盖度与住房质量指数 (HQI) 之间的统计关系。使用 2002 年和 2010 年 QuickBird 归一化差异植被指数图像的阈值分类得出的像素级植被覆盖图具有非常高的整体准确度，并且估计 2002 年至 2010 年研究区域的植被覆盖减少了 5.9%。尽管观察到绝对或相对植被覆盖变化与 2000 年的 HQI 之间的协变最小，但个别日期的植被覆盖由邻域水平的 HQI 解释。