Research & Development  
  Experimental Products / Prototypes  
     •   BookletChart™ (Experimental)  
     •   Water Level and Current Forecast Guidance  
  Hydrographic Support  
     •   Autonomous Underwater Vehicles (AUV)  
     •   Remotely Operated Vehicles (ROV)  
     •   Phase Differencing Bathymetric Sonar  
     •   Sound Velocity Profiler  
     •   Tidal Corrector Application (TCARI)  
  Products and Database Development  
     •   Coast Pilot Relational Database  
     •   VDatum Enhancements  
     •   Coastal Digital Elevation Models  
     •   nowCOAST  
  Coastal & Estuarine Ocean Modeling  
     •   Forecast System Modeling  
     •   Inundation Modeling  
     •   Ecological Modeling Applications  
     •   Community Modeling & Standards  
     •   Model Evaluation Environment  
  Learn About  
     •   Hydrographic Survey Equipment  
     •   Datums and Transformations  
     •   How Hydrodynamic Models Are Used  
     •   Technical Reports & Publications  
     •   Standards and Requirements  
  Data Portals  
     •   nowCOAST: Real-Time Coastal Data Map Portal  
     •   Tides and Currents (General)  
     •   Physical Oceanographic Real-Time System (PORTS)  
     •   Operational Forecast Systems  
     •   Sea Nettle Forecast Guidance  
     •   North American Horizontal Datum Conversion Utility  
     •   University of New Hampshire, Joint Hydrographic Center  

Standards and Requirements

Standards for Hydrodynamic Model Assessment

Skill assessment is an objective measurement of how well the model nowcast or forecast guidance does when compared to observations. NOS requires operational modeling systems to be assessed for skill in adherence to NOS standards. Skill assessment statistics that quantify model performance are calculated from significant model variables according to prescribed routines. In order for a nowcast/forecast system to be accepted operationally the skill assessment statistics must meet prescribed targets as described by NOS standards (see documentation). A skill assessment software package has been designed to perform skill assessment for water levels, currents, temperature, and salinity for different model systems in both tidally dominated and non-tidal regions. Documentation of the skill assessment software is available which describes the analysis and programs in further detail and is available for download.


Hess, K. W., T. F. Gross, R. A. Schmalz, J. G. W. Kelley, F. Aikman, III, E. Wei, and M. S. Vincent, 2003: NOS standards for evaluating operational nowcast and forecast hydrodynamic model systems, NOAA Technical Report NOS CS 17, 47 pp.

Zhang, A-J., K.W. Hess, E. Wei, and E. Myers, 2006: Implementation of model skill assessment software for water level and current in tidal regions, NOAA Technical Report NOS CS 24, 61 pp.

User Survey  | Privacy Policy  |  Disclaimer  |  NOAA's National Ocean Service  |  NOAA  |  U.S. Department of Commerce 
Web site owner: NOAA Office of Coast Survey