11
0.10033 22.00180 Conversion to TOA Reflectance
OLI band data can also be converted to TOA planetary reflectance using reflectance rescaling coefficients provided in the product metadata file (MTL file). The following equation is used to convert DN values to TOA reflectance for OLI data as follows:
ρλ' = MρQcal + Aρ
where:
ρλ' = TOA planetary reflectance, without correction for solar angle. Note that ρλ' does not contain a correction for the sun angle.
Mρ = Band-specific multiplicative rescaling factor from the metadata (REFLECTANCE_MULT_BAND_x, where x is the band number)
Aρ = Band-specific additive rescaling factor from the metadata (REFLECTANCE_ADD_BAND_x, where x is the band number)
Qcal = Quantized and calibrated standard product pixel values (DN)
TOA reflectance with a correction for the sun angle is then:带太阳角度校正的大气层顶反射率
ρλ'
ρλ'
ρλ = = cos(θSZ) sin(θSE)
Sz是指太阳天顶角solar zenith angle,se是指太阳高度角sun elevation。 太阳天顶角与太阳高度角互余,Sz=90-se。
产品类型 分辨率 输出格式 取样方法 地图投影 地形矫正 Level 1T地形矫正影像 1-7,9 -OLI多光谱波段(30米);8 –OLI全色波段(15米);10,11-TIRS波段(30米) GeoTIFF 三次卷积算法(Cubic Convolution Resampling) UTM-WGS84投影坐标系 L1 数据产品已经经过系统辐射校正和几何校正
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