opera-adt / COMPASS

COregistered Multi-temPorAl Sar Slc
Apache License 2.0
39 stars 18 forks source link

WIP: azimuth component calculation of solid earth tide #105

Closed seongsujeong closed 1 year ago

seongsujeong commented 1 year ago

This PR is to add azimuth component of the solid earth tide conversion, as well as integrating and finalizing the other LUT corrections that are implemented so far.

The conversion algorithm is based on ETAD ATBD available here.

Note that the 3D tidal displacement computation is performed in units of meters in the global ITRF. Therefore, the outcome needs conversion into slant-range and azimuth timing geometry of the correction grid. This conversion is performed by computing the zero Doppler radar times of the grid position 𝑋𝑔 including the tidal displacement Δ𝑋𝑆𝐸𝑇 and forming the difference to the grid nominal grid radar times.

This PR needs to be merged after the PRs below are merged. Until then, this PR will be labeled as work in progress.

103 #102

Also note that the algorithm here calculates range component as well as azimuth component by its nature.