Title Tutorial Konversi DN Landsat 8 235.2 KB 3
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c. Reflectance

ρλ
'
= MρQcal + Aρ

Keterangan:

ρλ
'
= TOA planetary reflectance

Mρ = Band-specific multiplicative rescaling factor from the metadata

Qcal = Quantized and calibrated standard product pixel values (DN)

Rumus algoritma di ER Mapper:

Reflectance band 1 = if i1<= 0 or i1>=65535 then null else (0.00002*i1-0.1)*1000

Reflectance band 2 = if i1<= 0 or i1>=65535 then null else (0.00002*i1-0.1)*1000

Reflectance band 3 = if i1<= 0 or i1>=65535 then null else (0.00002*i1-0.1)*1000

Reflectance band 4 = if i1<= 0 or i1>=65535 then null else (0.00002*i1-0.1)*1000

Reflectance band 5 = if i1<= 0 or i1>=65535 then null else (0.00002*i1-0.1)*1000

Reflectance band 6 = if i1<= 0 or i1>=65535 then null else (0.00002*i1-0.1)*1000

Reflectance band 7 = if i1<= 0 or i1>=65535 then null else (0.00002*i1-0.1)*1000

Reflectance band 10 = if i1<= 0 or i1>=65535 then null else (0.00002*i1-0.1)*1000

Reflectance band 11 = if i1<= 0 or i1>=65535 then null else (0.00002*i1-0.1)*1000

Nilai reflectance bernilai desimal, sehingga menggunakan faktor perkalian 1000 sehingga nilai

reflectance nya bernilai ratusan.

TOA reflectance dengan koreksi sudut matahari menjadi:

ρλ =

=

Keterangan:

ρλ = TOA planetary reflectance

θSE = Local sun elevation angle.

θSZ = Local solar zenith angle; θSZ = 90° - θSE

d. NDVI

NDVI =

NDVI = Normalized Difference Vegetation Index

NIR = Band Near Infra Red (band 5)

IR = Band Infra Red (band 4)

e. EVI

Perhitungan EVI berdasarkan persamaan (Heute et al 1999):

EVI = 2.5 (R2 –R1)/(1 + R2 + 6R1 –7.5R3 )

Dimana :

R1 = Reflektansi kanal infra merah dekat (NIR)