Table 2. Fomula of multispectral index.

Index	Fomula	Delta fomula
NDVI	N D V I = N I R − R E D N I R + R E D = B 08 − B 04 B 08 + B 04	dNDVI= NDVIpre − NDVIpost
NBR	N B R = N I R − S W I R N I R + S W I R = B 08 − B 12 B 08 + B 12	dNBR= NBRpre − NBRpost
MSI	M S I = S W I R N I R = B 08 B 11	dMSI= MSIpre − MSIpost