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Land Survey Services

What We Do

Land Survey provides surveying services to City Departments; advises City Departments on survey related issues; provides survey data that is accessible to the citizens of the City of Seattle and to all City Departments; maintains and expands the City’s infrastructure of horizontal and vertical monumentation; and advocates for improving survey issues that affect the citizens of Seattle.

We provide the following services:

  • Boundary surveys
  • Topographic surveys (a survey showing ground contours and utilities)
  • Bathymetric surveys (a survey showing the depths of bodies of water)
  • Construction surveys
  • Monitoring surveys (a survey showing any movement or lack thereof on any structure or point)
  • Right-of-way surveys
  • Support for aerial photogrammetry surveys
  • Control surveys
  • GPS surveys and others

Land Survey also provides advice on surveying matters, writes and checks land descriptions, and acts as a contact for negotiations with other surveying departments or surveying consultants.

We also maintain the Land Surveying records of the old Seattle Engineering Department, the old Seattle Water Department, and Seattle City Light.

Additional Information

Real Time GPS Network
The Washington State Reference Network is a Regional Cooperative of Real Time GPS Reference Stations and data that enables cost savings solutions for public and private sectors in the fields of survey mapping, and other high accuracy location technology needs. You may also contact Gavin Schrock at (206) 684-5630 or

Vertical and Horizontal Datums

  • North American Vertical Datum of 1988 (NAVD88)
  • North American Datum of 1983 (1991 adjustment) [NAD83 (1991)]

You should use the vertical and horizontal datums on properties and/or infrastructures owned, funded or maintained by the City of Seattle, or requiring City of Seattle permits or applicants. For more information please visit: the Seattle City Clerk's Office Legislative Databases. Follow the instructions to search for ordinance #121291.