Time-series covariance conversion

[jchencyz]

Based on error propagation, I suppose that converting the time-series covariance from phase to range requires squaring the conversion factor (i.e., (np.abs(phase2range))²)

Full script that generated the error

In ifgram_inversion.py:

ts = ts.reshape(num_date, num_row, num_col)
    ts_cov = ts_cov.reshape(num_date, num_date, num_row, num_col) if calc_cov else ts_cov
    inv_quality = inv_quality.reshape(num_row, num_col)
    num_inv_obs = num_inv_obs.reshape(num_row, num_col)

    # 3.2 convert displacement unit to meter
    if obs_ds_name.startswith(('unwrapPhase','ion')):
        phase2range = -1 * float(stack_obj.metadata['WAVELENGTH']) / (4.*np.pi)
        ts *= phase2range
        ts_cov = ts_cov * np.abs(phase2range) if calc_cov else ts_cov
        print('converting LOS phase unit from radian to meter')

Full error message

N/A

System information

• Operating system:
• Python environment:
• MintPy version:
• InSAR processor/product:
• Your custom / default template file (if the bug is related to a specific dataset):

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