search

opera-adt / COMPASS

COregistered Multi-temPorAl Sar Slc
Apache License 2.0
38 stars 17 forks source link

WIP Data size optimization for azimuth carrier phase and flattening phase #180

Closed seongsujeong closed 5 months ago

seongsujeong commented 1 year ago

This WIP PR is to add the data size optimization algorithm for azimuth carrier phase & flattening phase. Currently they are saved in the same resolution as CSLC layer, which means their sizes can go several hundred megabytes. The optimization strategy in discussion is mantissa truncation and phase quantization. Currently mantissa truncation was used in this PR to optimize those layers. Phase quantization will be implemented into this PR when the team decided to use that algorithm.

The plot below is the performance comparison between the two algorithms, with variable numbers of significant bits in case of truncate_mantissa()

Screenshot 2023-07-13 at 09 14 32
seongsujeong commented 5 months ago

Closing this PR as we decided to use mantissa truncation strategy after the discussion.