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Jupyter Notebooks for:

Yunjun, Z., Fattahi, H., Pi, X., Rosen, P., Simons, M., Agram, P., & Aoki, Y. (2022). Range Geolocation Accuracy of C-/L-band SAR and its Implications for Operational Stack Coregistration. IEEE Trans. Geosci. Remote Sens., 60, 1-19, doi:10.1109/TGRS.2022.3168509, arXiv.

Data (Zenodo)

The used data in the paper is available on Zenodo at https://doi.org/10.5281/zenodo.6360749. It includes the following 3 test sites:

• Sentinel-1 ascending track 149 in northern Chile
• Sentinel-1 descending track 156 in northern Chile
• ALOS-2 descending track 23 in southern Kyushu, Japan

For each dataset, it includes:

• SAR range and azimuth offset stack (using ISCE-2/PyCuAmpcor)
• SAR range offset time series (using MintPy)
• JPL high resolution Global Ionospheric Maps (GIM) and the topside TEC for ChileSenAT149.
• Solid Earth tides prediction (using PySolid)
• ERA5 tropospheric delay prediction (using PyAPS)

Figures

NOTE: This notebook is based on the released version of MintPy-1.3.3 and NOT maintained for furture development.

• Fig. 3 - Absolute tropospheric delay time series.
• Fig. 4 - Solid Earth tides in LOS direction and its power spectral density.
• Fig. 7 - Ionospheric range delay as a function of the vertical TEC.
• Fig. 8 - Ionospheric range delay - Impact of refraction.
• Fig. 10 - Ionospheric range delay - Global distribution during the last half solar cycle.
• Fig. 11-13 - Comparisons between the observed and predicted range delays for Sentinel-1 and ALOS-2.
• Fig. 14 - Sentinel-1 A/B range bias.
• Fig. 15 - Distribution of the relative range geolocation error after routine geolocation error corrections.
• Fig. 16-17 - Topside TEC - Impact on range geolocation + Temporal variation of topside-total-TEC ratio.
• Fig. 18 - Scaling the total TEC to the sub-orbital TEC - comparing different methods.
• Fig. 19 - CDF (cumulative distribution function) of range mis-registration for Sentinel-1 and ALOS-2.
• Fig. 20 - Demonstration of geometrical coregistration with model-driven refinements on ALOS over Hawaii.
• Table 4 - Range geolocation error budget for NISAR.