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161.03 Hydrography Data Standard


Hydrography Data Standard
Policy Action Date
Approved March 10, 2020
Sunset Review July 26, 2022

Hydrography data is a critical base data element used to support Washington State’s mission of protecting the environmental quality of the air, land, and water resources of Washington state.  The objective of this standard is to designate a single, common hydrography data model for agency geospatial data, geographic information systems, and data exchanges.  Geospatial data that is built on common technical standards:

  • Facilitates data exchanges for key datasets,
  • Reduces staff time spent converting between differing alignments, route systems and measures,
  • Minimizes error introduction brought on by the need to convert between differing alignments, route systems and measures, and
  • Enables on the fly integration of distributed and separately maintained geo-datasets.

The standard is designed to improve data quality and accuracy, and simplify the exchange of hydrography data among state agencies, local, tribal, state, and federal users and producers.

Downloadable Document 

Policy & Procedures:

  • 160.00 Geospatial Data Management Policy;
  • 162.00 Geospatial Technology Policy & Standards Procedure;
  • 103.00 Technology Policy and Standard Waiver Request.

Associated Standards:

  • 161.01 Geodetic Control Data;
  • 161.03 Hydrography Data Standard;
  • 161.04 Geospatial Data Standards (new);
  • 161.06 Web Mapping Publication Standard (new).

See Also

  • RCW 43.105.287 details the powers and duties of the Technology Services Board (TSB) including the authority to develop statewide or interagency information services and technical policies, standards, and procedures.