s100py 2.0.1

This python package provides api and utilities for encoding hydrographic datasets in the International Hydrographic Organization (IHO) S-100 format

s100py

API and Utilities for Working with IHO S-100 HDF5 Data Formats

Overview

This python package includes an API and utilities for encoding hydrographic datasets in the International Hydrographic Organization (IHO) S-100 HDF5 format.

See s100py Read the Docs for more information.

Background

The IHO S-100 standard is a data framework for digital products and services for hydrographic, maritime, and GIS communities, comprised of multiple data encoding formats designed for interoperability with Electronic Navigational Charts (ENCs).

This package includes the following S-100 encoding formats:

• S-102 Bathymetric Surface
• S-104 Water Level Information for Surface Navigation
• S-111 Water Currents for Surface Navigation

However, support for additional formats as they become available will be added in the future. For further information about S-100 formats, see the IHO website.

Create S100 Products

• Follow S-102 examples to create an S-102 File
• Follow S-104 examples to create an S-104 File
• Follow S-111 examples to create an S-111 File

For S100 API Developers

• Extending the API
• Example API
• Using Example API
• Advanced Example API Usage

Requirements

This codebase is written for Python >=3.8 and relies on the following python packages:

• h5py
• numpy
• gdal

Installation

Conda

Installing s100py from the conda-forge channel can be achieved by adding conda-forge to your channels with:

conda config --add channels conda-forge
conda config --set channel_priority strict

Once the conda-forge channel has been enabled, s100py can be installed with conda:

conda install s100py

or with mamba:

mamba install s100py

It is possible to list all the versions of s100py available on your platform with conda:

conda search s100py --channel conda-forge

or with mamba:

mamba search s100py --channel conda-forge

Alternatively, mamba repoquery may provide more information:

Search all versions available on your platform:

mamba repoquery search s100py --channel conda-forge

List packages depending on s100py:

mamba repoquery whoneeds s100py --channel conda-forge

List dependencies of s100py:

mamba repoquery depends s100py --channel conda-forge

PIP

If installing with PIP, this package requires GDAL Python bindings be present, so it usually can't be installed just using pip install gdal, but for more information visit https://pypi.org/project/GDAL/.

Once gdal has been installed, s100py can be installed using pip:

pip install s100py

Release Notes

Version 2.0.1 (2025-12-12)

• This release delivers specification-aligned corrections and functional enhancements across the S100, S102, S104, and S111 API and utilities

• S102 v3.0:

  • Fix georeferencing offset where grid cells were shifted by half the spatial resolution
  • Add origin_corner argument so gdal GetGeoTransform( ) results can be used directly
  • Add missing attributes on QualityOfBathymetry that should match BathymetryCoverage values (dataOffsetCode, numInstances, commonPointRule)
  • Add flag to trim nodata buffer around outside of supplied raster
  • Fix version upgrade function for bounding box
  • Deprecate horizontalDatumValue

• S104/S111: Add barycentric grid coordinate support with bounding-box offset adjustments

• S111: Fix surface current speed calculations across v1.0, v1.2, and v2.0

• S104: Fix water level height calculations across v1.0, v1.1, and v2.0

• S100: Convert python isoformat to basic iso 8601 by removing delimiters

• S100: Update to_geotiffs() to account for dataOffsetCode

Version 2.0.0 (2025-07-09)

• This is a major release, which includes several new APIs that encapsulate the latest S-100 standard (S-100 Edition 5.2.0) and S-100 Product Specifications (S-102 Edition 3.0.0, S-111 Edition 2.0.0, S-104 Edition 2.0.0)
• Additional convenience utilities have been added to generate:
  • S-102 Edition 3.0.0 datasets
    • Not Supported in s100py v2.0.0:
      • Option for multiple VerticalDatums with multiple BathymetryCoverages
  • S-111 Edition 2.0.0 datasets
    • Breaking Changes in s100py v2.0.0:
      • Must call add_surface_current_instance() before calling add_data_from_arrays() to generate datasets
      • update_metadata() parameter requirements have changed and only dataDynamicity and dateTimeOfFirstRecord are required in the metadata dictionary parameter
    • New Features in s100py v2.0.0:
      • Optional speed_uncertainty and direction_uncertainty grids now supported, if adding an uncertainty grids, speed_uncertainty and direction_uncertainty must be set to True in create_s111() and uncertainty data grids must be added to add_data_from_arrays()
      • add_surface_current_instance() can be used to create multiple surface current feature instances in a single dataset
    • Not Supported in s100py v2.0.0:
      • Utilities for generating S-111 Data Coding Formats 4 and 8
  • S-104 Edition 2.0.0 datasets
    • Breaking Changes in s100py v2.0.0:
      • Must call add_water_level_instance() before calling add_data_from_arrays() to generate datasets
      • update_metadata() parameter requirements have changed and only dataDynamicity and dateTimeOfFirstRecord are required in the metadata dictionary parameter
    • New Features in s100py v2.0.0:
      • Optional water level height uncertainty grid now supported, if adding an uncertainty grid , uncertainty must be set to True in create_s104() and uncertainty data grids must be added to add_data_from_arrays()
      • add_water_level_instance() can be used to create multiple water level feature instances in a single dataset
    • • Not Supported in s100py v2.0.0:
    • Option for multiple VerticalDatums with multiple coverages
• S-102 Edition 3.0.0 (S-100 Edition 5.2.0) significant changes include:
  • Make Uncertainty optional in BathymetryCoverage
  • Renamed QualityOfSurvey to QualityOfBathymetryCoverage
  • Added option for multiple VerticalDatums with multiple BathymetryCoverages
  • dataOffsetCode now required in s102 and must have value of 5 (barycentric)
  • BathymetryCoverage now is dataCodingFormat is 2, regular grid
  • QualityOfBathymetryCoverage dataCodingFormat remains 9, feature oriented
  • BathymetryCoverage Container
    • DataCodingFormat revised from 9 to 2 (regularGrid)
    • common_point_rule revised from 1 to 2 (low)
    • data_offset_code = 5 (barycenter)
• S-111 Edition 2.0.0 (S-100 Edition 5.2.0) significant changes include:
  • Added directionUncertainty and speedUncertainty added to the values record as optional attributes
  • New fill value for date-time attribute
  • Added UTM zones and newer WGS84 epochs
  • Added verticalCoordinateBase embedded metadata for S-100 consistency
  • Removed “DateTime” as UoM name for surface current time attribute in Group_F
  • Removed ISO metadata files
  • Added restriction on length of string attributes in metadata
  • The following DataDynamicity classification have been added:
    • 6: observedMinusPredicted - Observation minus astronomical prediction
    • 7: observedMinusAnalysis - Observation minus analysis or hybrid
    • 8: observedMinusHindcast - Observation minus hydrodynamic hindcast
    • 9: observedMinusForecast - Observation minus hydrodynamic forecast
    • 10: forecastMinusPredicted - Hydrodynamic forecast minus astronomical prediction
  • Added optional dataOffsetCode enumeration for Offset of data point in cell data, mandatory if data points are at grid cell centres
• S-104 Edition 2.0.0 (S-100 Edition 5.2.0) significant changes include:
  • Scope reduced to use only the regular grid spatial type
  • The only allowed interpolation type for DCF2 is 1 (nearestneighbor)
  • The following s104_DataDynamicity classifications are not allowed in S-104 Edition 2.0:
    • 4: hydrodynamicHindcast - Observation minus astronomical prediction
    • 6: observedMinusPredicted - Observation minus analysis or hybrid
    • 7: observedMinusAnalysis - Observation minus hydrodynamic hindcast
    • 8: observedMinusHindcast - Observation minus hydrodynamic hindcast
    • 9: observedMinusForecast - Observation minus hydrodynamic forecast
    • 10: forecastMinusPredicted - Hydrodynamic forecast minus astronomical prediction
  • verticalCoordinateBase attribute added the only allowed value is verticalDatum (2), the attribute is now mandatory
  • Instance metadata constraints adjusted for Water Level adjustment compatibility
  • Restricted maximum length of HDF5 string attributes
  • Optional uncertainty attribute added to values record, represents the uncertainty at a particular grid point and may be omitted if the uncertainty is the same at all grid points
  • Added UTM zones and newer WGS84 realizations
  • Removed ISO metadata files
  • Optional Group F waterLevelTime attribute has been removed
  • Optional Group F uncertainty attribute has been added
  • Extended format to include grids with datum jumps (multiple vertical datums)
  • Domain extent polygon added to Feature Instance if and only if the feature covers an area with a different vertical datum from the root group
  • Added optional dataOffsetCode enumeration for offset of data point in cell data, mandatory if data points are at grid cell centres
  • The values seaFloor (47), seaSurface (48), and hydrographicZero (49) from S100 allowable vertical and sounding datums are now not allowed in S-104 Edition 2.0

Version 1.0.0 (2023-10-27)

• This is a major release, which includes several new APIs that encapsulate the latest S-100 standard (S-100 Edition 5.0.0) and S-100 Product Specifications (S-102 Edition 2.2.0, S-111 Edition 1.2.0, S-104 Edition 1.1.0) and adds support for multiple S-100 Editions and Product Specification versions
• Additional convenience utilities have been added to generate:
  • S-102 Edition 2.1.0 & 2.2.0 datasets
  • S-111 Edition 1.0.0 & 1.2.0 datasets
  • S-104 Edition 1.0.0 & 1.1.0 datasets
  • S-102 Data Coding Format 9 (Feature Oriented Regular Grid) datasets
  • S-104 Data Coding Format 3 (Irregular Grid) datasets
  • S-104 Data Coding Format 7 (TIN) datasets
• S-102 Edition 2.1.0 (S-100 Edition 4.0) significant changes include:
  • The depth orientation has changed from positive up to positive down
• S-102 Edition 2.2.0 (S-100 Edition 5.0) significant changes include:
  • General metadata horizontalDatumReference and horizontalDatumValue have been removed
  • General metadata attributes horizontalCRS and typeOfHorizontalCRS were added
  • Stricter datatypes have been set for all attributes
  • Added the feature attribute table QualityOfSurvey which provides the following additional survey metadata:
    • The categorization of the assessment level of bathymetric data for an area
    • If the least depth of detected features in an area was measured
    • If significant features have or have not been detected in the course of a survey
    • The size of detected bathymetric features in an area
    • Percentage of depth that a feature of such size could be detected
    • If full seafloor coverage has been achieved in the area by hydrographic surveys
    • Flag for bathy coverage nodes populated by interpolation
    • The best estimate of the fixed horizontal or vertical accuracy component for positions, depths, heights, vertical distances, and vertical clearances
    • The factor to be applied to the variable component of uncertainty equation to provide the best estimate of the variable horizontal or vertically accuracy component for positions, depths, heights, vertical distances, and vertical clearances
    • The start date of the period of the hydrographic survey
    • The end date of the period of the hydrographic survey
    • The survey filename or ID
    • The authority which as responsible for the hydrographic survey
    • An estimate of the magnitude of the difference between true and estimated bathymetric depth, after all appropriate corrections are made
• S-111 Edition 1.2.0 (S-100 Edition 5.0.0) significant changes include:
  • General metadata horizontalDatumReference and horizontalDatumValue have been removed
  • General metadata attributes horizontalCRS and typeOfHorizontalCRS were added
  • Stricter datatypes have been set for all attributes
  • General metadata attribute depthTypeIndex has been modified to only allow heightOrDepth or layerAverage
  • General metadata datasetDeliveryInterval was added, describing the expected time interval between availability of successive datasets for time-varying data, formatted as an ISO 8601 duration (e.g. 'PnYnMnDTnHnMnS')
  • The enumeration attribute for the classification of data according the relationship between the time of its collection, generation or calculation of generation parameters, in relation the time of publication has been changed from typeOfCurrentData to dataDynamicity
• S-104 Edition 1.1.0 (S-100 Edition 5.0.0) significant changes include:
  • General metadata horizontalDatumReference and horizontalDatumValue have been removed
  • General metadata attributes horizontalCRS and typeOfHorizontalCRS were added
  • Stricter datatypes have been set for all attributes
  • General metadata datasetDeliveryInterval was added, describing the expected time interval between availability of successive datasets for time-varying data, formatted as an ISO 8601 duration (e.g. 'PnYnMnDTnHnMnS')
  • The enumeration attribute for the classification of data according the relationship between the time of its collection, generation or calculation of generation parameters, in relation the time of publication has been changed from typeOfWaterLevelData to dataDynamicity
  • General metadata trendInterval was added, describing the interval in minutes over which trend at a particular time is calculated

Version 1.0.0-rc.1 (2021-02-11)

• This is a major release, which includes a new API that encapsulates the data specifications to allow introspection with Python to determine what data is available or should be and what data types would be acceptable. Convenience utilities are available to convert data into S102/S104/S111 so detailed knowledge of the S100 specs and APIs is not required in most cases
• Support for s102 (bathymetry) and s104 (water levels) has been added
• A consistent API for S100 data structures was added and is used to encode S102, S104, and S111
• The previous S111 library has been migrated to this general S100 API and therefore any code written against the previous s100py library will no longer work
• Examples of using the new S111 API are available here

Authors

• Barry Gallagher (NOAA), [e-mail]
• Erin Nagel (UCAR), [e-mail]
• Glen Rice (NOAA), [e-mail]
• Jason Greenlaw

License

This work, as a whole, falls under Creative Commons Zero (see LICENSE).

Disclaimer

This repository is a scientific product and is not official communication of the National Oceanic and Atmospheric Administration, or the United States Department of Commerce. All NOAA GitHub project code is provided on an 'as is' basis and the user assumes responsibility for its use. Any claims against the Department of Commerce or Department of Commerce bureaus stemming from the use of this GitHub project will be governed by all applicable Federal law. Any reference to specific commercial products, processes, or services by service mark, trademark, manufacturer, or otherwise, does not constitute or imply their endorsement, recommendation or favoring by the Department of Commerce. The Department of Commerce seal and logo, or the seal and logo of a DOC bureau, shall not be used in any manner to imply endorsement of any commercial product or activity by DOC or the United States Government.