Hi,
In all the assets I’ve looked at, the asset metadata XML file contains PHYSICAL_GAINS for bands numbered 0 through 11, but SOLAR_IRRADIANCE is for bands 0 through 12. The gain value for one band is missing - can anyone explain why? Are the gains relative to reference band 0? The docs do not go into details on this.
Example:
<Reflectance_Conversion>
1.02717879544021
<Solar_Irradiance_List>
<SOLAR_IRRADIANCE bandId=“0” unit=“W/m²/µm”>1913.57</SOLAR_IRRADIANCE>
<SOLAR_IRRADIANCE bandId=“1” unit=“W/m²/µm”>1941.63</SOLAR_IRRADIANCE>
<SOLAR_IRRADIANCE bandId=“2” unit=“W/m²/µm”>1822.61</SOLAR_IRRADIANCE>
<SOLAR_IRRADIANCE bandId=“3” unit=“W/m²/µm”>1512.79</SOLAR_IRRADIANCE>
<SOLAR_IRRADIANCE bandId=“4” unit=“W/m²/µm”>1425.56</SOLAR_IRRADIANCE>
<SOLAR_IRRADIANCE bandId=“5” unit=“W/m²/µm”>1288.32</SOLAR_IRRADIANCE>
<SOLAR_IRRADIANCE bandId=“6” unit=“W/m²/µm”>1163.19</SOLAR_IRRADIANCE>
<SOLAR_IRRADIANCE bandId=“7” unit=“W/m²/µm”>1036.39</SOLAR_IRRADIANCE>
<SOLAR_IRRADIANCE bandId=“8” unit=“W/m²/µm”>955.19</SOLAR_IRRADIANCE>
<SOLAR_IRRADIANCE bandId=“9” unit=“W/m²/µm”>813.04</SOLAR_IRRADIANCE>
<SOLAR_IRRADIANCE bandId=“10” unit=“W/m²/µm”>367.15</SOLAR_IRRADIANCE>
<SOLAR_IRRADIANCE bandId=“11” unit=“W/m²/µm”>245.59</SOLAR_IRRADIANCE>
<SOLAR_IRRADIANCE bandId=“12” unit=“W/m²/µm”>85.25</SOLAR_IRRADIANCE>
</Solar_Irradiance_List>
</Reflectance_Conversion>
<PHYSICAL_GAINS bandId=“0”>4.07193978392568</PHYSICAL_GAINS>
<PHYSICAL_GAINS bandId=“1”>3.81675257972578</PHYSICAL_GAINS>
<PHYSICAL_GAINS bandId=“2”>4.21286425136516</PHYSICAL_GAINS>
<PHYSICAL_GAINS bandId=“3”>4.54011934815752</PHYSICAL_GAINS>
<PHYSICAL_GAINS bandId=“4”>5.23145698789764</PHYSICAL_GAINS>
<PHYSICAL_GAINS bandId=“5”>4.89886150671325</PHYSICAL_GAINS>
<PHYSICAL_GAINS bandId=“6”>4.56289482908291</PHYSICAL_GAINS>
<PHYSICAL_GAINS bandId=“7”>6.23267377679018</PHYSICAL_GAINS>
<PHYSICAL_GAINS bandId=“8”>5.16496349734261</PHYSICAL_GAINS>
<PHYSICAL_GAINS bandId=“9”>8.58724430128541</PHYSICAL_GAINS>
<PHYSICAL_GAINS bandId=“10”>55.3503943677841</PHYSICAL_GAINS>
<PHYSICAL_GAINS bandId=“11”>35.3996273592588</PHYSICAL_GAINS>
<REFERENCE_BAND>0</REFERENCE_BAND>
</Product_Image_Characteristics>
Thanks,
Simon