Stow Douglas A, Weeks John R, Toure Sory, Coulter Lloyd L, Lippitt Christopher D, Ashcroft Eric
San Diego State University.
Prof Geogr. 2013;65(3). doi: 10.1080/00330124.2012.697856.
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.
（1）量化、绘制并分析2002年和2010年加纳阿克拉的植被覆盖分布及变化情况；（2）在社区层面研究2000年植被覆盖与住房质量指数（HQI）之间的统计关系。利用2002年和2010年快鸟归一化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总体精度，且得出2002年至2010年研究区域内植被覆盖减少了5.9%的估计值。社区层面的住房质量指数解释了各日期植被覆盖的高度变化，尽管在绝对或相对植被覆盖变化与2000年住房质量指数之间观察到的协变关系极小。
