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

Table 2

DN (8 bit) of endmembers identified using various techniques from study area 2.

Techniques	DN of vegetation			DN of soil			DN of deep water			DN of shallow water
	b1	b2	b3	b1	b2	b3	b1	b2	b3	b1	b2	b3
PCA	109	72	102	176	148	126	155	109	52	91	53	46
PPI	104	66	101	170	143	126	155	109	52	93	56	44
Convex hull	111	59	128	177	157	132	162	116	55	93	59	40

Note. b1 = IRS 1C band 1, b2 = IRS 1C band 2, and b3 = IRS 1C band 3.