CALIBRATION

# L1b

## G16
OR_ABI-L1b-RadF-M6C14_G16_s20201830000209_e20201830009517_c20201830010011.nc

## G17
OR_ABI-L1b-RadF-M6C14_G17_s20201830000319_e20201830009386_c20201830009442.nc

## H8
HS_H08_20200701_0000_B14_FLDK_R20_S0110.DAT ... HS_H08_20200701_0000_B14_FLDK_R20_S1010.DAT

## M8
H-000-MSG1__-MSG1_IODC___-IR_108___-000001___-202007010000-C_ ... H-000-MSG1__-MSG1_IODC___-IR_108___-000008___-202007010000-C_

## M11
H-000-MSG4__-MSG4________-IR_108___-000001___-202007010000-C_ ... H-000-MSG4__-MSG4________-IR_108___-000008___-202007010000-C_


# SatPy Calibration

## G16 and G17

L1b stores *radiance*

## H8

* L1b stores *counts*
* has 2 radiance calibrations: nominal (header block 5) and inter-calibration (header block 6)
* ISCCP-NG L1g uses the inter-calibration coefficients
* no difference in practice
* user can supply calibration

calib_dict = {'B07': {'slope': 0.0037, 'offset': 18.5},
              'B14': {'slope': -0.002, 'offset': 22.8},
              'type': 'DN'}
* has calibration for radiance -> brightness temperature

        c0_ = self._header['calibration']["c0_rad2tb_conversion"][0]
        c1_ = self._header['calibration']["c1_rad2tb_conversion"][0]
        c2_ = self._header['calibration']["c2_rad2tb_conversion"][0]

        return (c0_ + c1_ * Te_ + c2_ * Te_ ** 2).clip(0)


## M8 and M11

* L1b stores *counts*
* has 2 calibrations in SatPy: nominal and GSICS (only for IR, VIS is filled with nominal)
* ISCCP-NG L1g uses "nominal"

reader_kwargs={'ext_calib_coefs': coefs}