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remkos / rads

Radar Altimeter Database System (RADS)
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3a mean step change #184

Closed andreustaylor closed 1 year ago

andreustaylor commented 2 years ago

A step change is apparent in 3a SLA when processing with default tools. This results in recent 3a data appearing to be offset downwards by ~2cm from other satellites.

Can users change configuration in xml to ensure 3a offset remains consistent?

Replication: radsstat --ymd 20210628,20210701 -l -V sla -S 3a --> ~0.06 radsstat --ymd 20220628,20220728 -l -V sla -S 3a --> ~0.04

leuliett commented 2 years ago

The bias change occurs when S3A switches to baseline processor 05 on June 11 starting with cycle 86 and pass 396.

leuliett commented 2 years ago

No documentation available from EUMETSAT or Copernicus about the baseline changes. https://www.eumetsat.int/current-altimetry-processing-baselines https://sentinels.copernicus.eu/web/sentinel/technical-guides/sentinel-3-altimetry/processing-baseline

remkos commented 1 year ago

This has been repaired since the latest full mission reprocessing. See https://www.eumetsat.int/release-sentinel-3-altimetry-marine-bc005-reprocessed-dataset