[gdal-dev] How to get the ENVISAT N1 Main Processing parameters

[RSyaoxin]

Hi,I want to calibration the ENVISAT ASAR DATA(.N1 Format). I need to get
it's main processing parameters,such as
calibration_factors[0].ext_cal_fact[0],first_line_tie_point_angles[0-10],and
I wrote: CString
sDomain=m_pDataset->GetMetadataItem("MAIN_PROCESSING_PARAMS_ADS_CALIBRATION_FACTORS[0].EXT_CAL_FACT[0]");but
I can't get result. 
However, "CString sDomain=m_pDataset->GetMetadataItem("SPH_FIRST_MID_LAT")"
is right.That's Why?How should I go to get necessary information? 
I turn to Anybody who once did this job for some advice. Thank you! 
Kind regards.

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