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Sudut Azimuth dan Zenith Satelit Landsat 8

Informasi satellite azimuth and zenith angle diperlukan sebagai input saat melakukan koreksi atmosferik, khususnya ketika menggunakan software simulasi 6S. (Penjelasan seputar koreksi atmosferik, akan diberikan pada tutorial terpisah)

Satellite zenith angle

Citra satelit Landsat 1 sampai Landsat 7 selalu memotret pada arah nadir, sehingga satellite zenith angle nya akan sama dengan 0°.

Mulai Landsat 8, satelite tidak selalu mengarah ke nadir, sehingga dalam metadata terdapat informasi seputar off-nadir, seperti di bawah

NADIR_OFFNADIR = "NADIR"
ROLL_ANGLE = -0.001

ROLL_ANGLE merupakan  satellite zenith angle.

Satellite/View Azimuth Angle

Untuk menghitung azimuth dari satelit, kita bisa menggunakan dua koordinat yang ada di metadata:

Koordinat di pojok atas kiri:

CORNER_UL_LAT_PRODUCT = -1.84419
CORNER_UL_LON_PRODUCT = 120.73297
Koordinat di pojok atas kanan:
CORNER_LL_LAT_PRODUCT = -3.94598
CORNER_LL_LON_PRODUCT = 120.72879

Ubah koordinat ke format DMS (Derajat, Menit, Detik), bisa menggunakan :

http://www.satsig.net/degrees-minutes-seconds-calculator.htm

Decimal Degree to DMS
Decimal Degree to DMS

Penghitungan azimuth dari dua koordinat (DMS), bisa menggunakan : http://www.fcc.gov/encyclopedia/distance-and-azimuths-between-two-sets-coordinates

Azimuth from two coordinates
Azimuth from two coordinates
Azimuth calculation result, use the azimuth from 2 to 1 point
Azimuth calculation result, use the azimuth from 2 to 1 point

 

Referensi:

http://gis.stackexchange.com/questions/91062/landsat-observation-zenith-and-azimuth-angles

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