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National Center for Atmospheric Research Boulder, CO October 21, 2005 Andy Stern

Metadata for RWIS. National Center for Atmospheric Research Boulder, CO October 21, 2005 Andy Stern Consulting Meteorologist Mitretek Systems. What is Metadata?. Metadata is defined as “data about data”

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National Center for Atmospheric Research Boulder, CO October 21, 2005 Andy Stern

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  1. Metadata for RWIS National Center for Atmospheric Research Boulder, CO October 21, 2005 Andy Stern Consulting Meteorologist Mitretek Systems

  2. What is Metadata? • Metadata is defined as “data about data” • Metadata is a necessary component for observations to be included in data collecting networks (such as MADIS) • Some portions of metadata can change frequently, so it is important for end users to understand the circumstances under which the data were collected

  3. What is Metadata used for? • Metadata can describe almost any quality about an observation. Some examples include: • Platform location & elevation • The types & makes of sensors • Calibration records • Maintenance records • Site exposure

  4. Minimum Metadata for ESS • From a MADIS data table: • |MN001|Twin Lakes I-35 Mile Post 1 • |371.1000|43.50833|-93.35406|GMT| • Station Name/Identifier (5 characters) • Long Name String (35 characters) • Station Latitude/Longitude (to 5 digits) • Station Elevation (to 4 digits) • Time Basis (Greenwich Mean Time)

  5. State DOTs Providing Data to MADIS

  6. Expanded Metadata - Identification • Platform ID/Site Number • Plain Text Location • Latitude/Longitude/Elevation • Access Directions • Datum • RPU Make • Nearest AWOS/ASOS Site • Advanced Traffic Management Systems ID

  7. Metadata - Instrumentation • Type & Model of each instrument • Number of road sensors • Puck layout diagram • Location of sub-grade temperature probe • Sensors in bridge decks/ramps • Maintenance/Calibration Records

  8. Graphical Metadata I-80 EB Puck Layout Diagram RWIS

  9. Metadata – Site Exposure • Digital Image of Site • Digital Panoramic View of Site • Distance to center of road • Obstructions (direction & distance) • Landscape Features • Four Quadrant Site Layout • Terrain Slope (degrees & direction) • Base Height Above/Below the Roadway

  10. Example of Digital Panorama Interstate 80 @ Wahsatch, Utah

  11. Metadata value to the community • Other communities (such as weather, energy, CVO, agriculture) can use metadata to determine if the observations are: • representative for their task • have appropriate exposure • have a robust maintenance policy • have an established climate record

  12. Additional Information • New Publication from FHWA • “Road Weather Information System Environmental Sensor Station Siting Guidelines” • Partnership between FHWA, Aurora Pooled Fund Program and the AASHTO Snow and Ice Cooperative Program • Available from http://ops.fhwa.dot.gov/publications/ess05/

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