A Comparative Analysis of Methods of Endmember Selection for Use in Subpixel Classification: A Convex Hull Approach

Table 3

Performance of the three approaches in the provision of endmembers.

Approaches	Aspects
	DN	Scatter plot/image	Pinpointing of pure pixels	Correctness of endmember spectra
PCA	Moderately typical	Highly clustered	Poor	Moderate
PPI	Typical	Least number of pure pixels depicted	Moderate	Moderate
Convex hull algorithm	Highly typical	Extreme pixels only depicted	Excellent	Excellent