neqsim-pipeline-survey-processing

Pass survey records with kp_m and depth_to_top_m to PipelineSurveyProcessor.process, which removes null markers, sorts and decimates stations, normalises the depth sign convention, and returns kp_profile_m and elevation_profile_m. Call to_neqsim_elevation_profile to resample for a NeqSim pipe model.

The processor compares each depth against a rolling median and flags points whose residual exceeds outlier_threshold times a robust sigma derived from the median absolute deviation, floored at minimum_residual_m. Flagged points are reported with KP, depth, and residual but never silently deleted.

No. It reports free-span candidates as geometric intervals with length, maximum, and mean gap only. Modal response, VIV screening, and fatigue assessment belong to DNV-RP-F105 and require a qualified pipeline engineer.

Yes. Swapped latitude/longitude column order is detected and corrected, then coordinates are projected onto a local equirectangular frame to derive KP when it is missing. This projection is for screening only and must not be used for positioning or datum work.

Both surveys are interpolated onto a common KP grid and differenced, but a depth change can come from datum, tide, or survey uncertainty as easily as real movement. The skill labels intervals as lowering or lifting and requires reconciliation against the positioning basis before claiming movement.

It is screening only, with no geodetic datum transformation, tide correction, or soil model. Points within half a smoothing window of each end are not assessed for outliers, and a single-station gap reports zero span length.