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

Table 1

DN (8 bit) of endmembers identified using various techniques from study area 1.

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	99	64	115	181	164	124	123	85	48	211	175	100
PPI	124	83	123	181	164	124	101	69	66	—	—	—
Convex hull	118	80	120	181	164	124	125	84	49	211	175	100

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