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s111-surface-currents

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UpdatedApril 17, 2026 at 05:27

Expert knowledge of IHO S-111 Surface Currents Product Specification. Covers HDF5-encoded current speed/direction time-step grids, SurfaceCurrent feature, Group_NNN time-series groups, data coding formats (regular grid, ungeorectified grid, time series at fixed stations, moving platform, etc.), and current portrayal (arrows, colour bands). USE FOR: S-111 datasets, surface currents, current speed and direction, S111DatasetReader, S111CoverageSource, S111PortrayalCatalogue, time-step iteration of currents, adding S-111 features, S-111 tests. DO NOT USE FOR: S-104 water levels (use s104-water-level), S-102 bathymetry (use s102-bathymetry), generic HDF5 (use s100-framework).

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philliphoff

philliphoff/EncDotNet.S100

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SKILL.md

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name

s111-surface-currents

description

S-111 Surface Currents expert

When engaged

Tasks touching src/EncDotNet.S100.Datasets.S111/** or tests/EncDotNet.S100.Datasets.S111.Tests/**
Changes to CoveragePipeline/ICoverageSource affecting S-111
Current vector portrayal (arrow rendering, colour scaling)

Spec anchors

Canonical: S-111 Edition 2.0.0 Surface Currents PS
S-100 Part 8: Coverages
S-100 Part 10c: HDF5 encoding
S-111 Annex A: Feature Catalogue
S-111 Annex B: Portrayal Catalogue

Review checklist

HDF5 layout under /SurfaceCurrent/SurfaceCurrent.NN/Group_NNN/values matches spec; root attributes include dataCodingFormat, methodCurrentsProduct, typeOfCurrentData, numberOfTimes, timeRecordInterval, dateTimeOfFirstRecord, dateTimeOfLastRecord, commonPointRule.
dataCodingFormat selects layout — regular grid (2), ungeorectified grid (3), time series at fixed stations (4), stationwise (1), moving platform (5). Do not assume regular grid.
Compound dataset values: surfaceCurrentSpeed (float32, knots) and surfaceCurrentDirection (float32, degrees true, 0–360).
Direction convention is degrees true, "going to" (oceanographic), not "coming from". Document/cite this when surfacing it.
Times derived from dateTimeOfFirstRecord + timeRecordInterval unless explicit time dataset is present.
Public API changes have xunit tests using SkippableFact.

Known pitfalls in this repo

Speed units vary by producer — spec says knots, but always honor the file's surfaceCurrentSpeedUom attribute.
Wrap-around at 360° must be handled when interpolating directions.
Multiple SurfaceCurrent.NN sub-groups can coexist (analysis vs. forecast); iterate.

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name

s111-surface-currents

description

S-111 Surface Currents expert

When engaged

Tasks touching src/EncDotNet.S100.Datasets.S111/** or tests/EncDotNet.S100.Datasets.S111.Tests/**
Changes to CoveragePipeline/ICoverageSource affecting S-111
Current vector portrayal (arrow rendering, colour scaling)

Spec anchors

Canonical: S-111 Edition 2.0.0 Surface Currents PS
S-100 Part 8: Coverages
S-100 Part 10c: HDF5 encoding
S-111 Annex A: Feature Catalogue
S-111 Annex B: Portrayal Catalogue

Review checklist

HDF5 layout under /SurfaceCurrent/SurfaceCurrent.NN/Group_NNN/values matches spec; root attributes include dataCodingFormat, methodCurrentsProduct, typeOfCurrentData, numberOfTimes, timeRecordInterval, dateTimeOfFirstRecord, dateTimeOfLastRecord, commonPointRule.
dataCodingFormat selects layout — regular grid (2), ungeorectified grid (3), time series at fixed stations (4), stationwise (1), moving platform (5). Do not assume regular grid.
Compound dataset values: surfaceCurrentSpeed (float32, knots) and surfaceCurrentDirection (float32, degrees true, 0–360).
Direction convention is degrees true, "going to" (oceanographic), not "coming from". Document/cite this when surfacing it.
Times derived from dateTimeOfFirstRecord + timeRecordInterval unless explicit time dataset is present.
Public API changes have xunit tests using SkippableFact.

Known pitfalls in this repo

Speed units vary by producer — spec says knots, but always honor the file's surfaceCurrentSpeedUom attribute.
Wrap-around at 360° must be handled when interpolating directions.
Multiple SurfaceCurrent.NN sub-groups can coexist (analysis vs. forecast); iterate.