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The CUAHSI Observations Data Model

The CUAHSI Observations Data Model. Jeff Horsburgh 7-9-2007. David Maidment, David Tarboton, Ilya Zaslavsky, Michael Piasecki, Jon Goodall, David Valentine, Tom Whitenack, Tim Whiteaker, Bora Beran, Ernest To. http://www.cuahsi.org/his.html. Primary Use Cases.

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The CUAHSI Observations Data Model

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  1. The CUAHSI Observations Data Model Jeff Horsburgh 7-9-2007 David Maidment, David Tarboton, Ilya Zaslavsky, Michael Piasecki, Jon Goodall, David Valentine, Tom Whitenack, Tim Whiteaker, Bora Beran, Ernest To http://www.cuahsi.org/his.html

  2. Primary Use Cases • Relational data model underlying the CUAHSI Hydrologic Information System • Observation catalogs for national datasets (USGS NWIS, EPA STORET) and web services • Standardization of investigator data management in environmental observatories

  3. What is an Observation? • An observation is an event that results in a value describing some phenomenon (OGC Observations and Measurements, 2006) • ODM focuses on observations made at a point • Types: grab samples for laboratory analysis, physical measurements from field instruments, streaming data from in-situ sensors • Not covered – observation fields (e.g., grids, images, etc.)

  4. ODM Overview Streamflow Groundwater levels • A relational database at the single observation level (atomic model) • Stores observation data made at points • Metadata for unambiguous interpretation • Traceable heritage from raw measurements to usable information • Standard format for data sharing • Cross dimension retrieval and analysis ODM Precipitation & Climate Soil moisture data Water Quality Flux tower data

  5. Associated Tools • Data Loaders • ODM Data Loader • Streaming Data Loader • ODM Tools • Query and export – export data series and metadata • Visualize – plot and summarize data series • Edit – delete, modify, adjust, interpolate, average, etc. • Controlled Vocabularies • Online moderated system

  6. Associated Tools • ODM Web Services • WaterML • Data Access System for Hydrology (DASH) • A common data window for accessing, viewing and downloading hydrologic information • HydroSeek • Ontology basedsearch engine

  7. Model Extensibility • The ODM schema is generic, but the controlled vocabularies are not • Variable names, data types, units, etc. • ODM controlled vocabularies are editable via a moderated system online • Working on ODM API to shield applications from changes to the database schema

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