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CUAHSI Web Services and Hydrologic Information Systems

CUAHSI Web Services and Hydrologic Information Systems. By David R. Maidment, University of Texas at Austin

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CUAHSI Web Services and Hydrologic Information Systems

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  1. CUAHSI Web Services and Hydrologic Information Systems By David R. Maidment, University of Texas at Austin Collaborators: Ilya Zaslavsky and Reza Wahadj, San Diego Supercomputer Center, Tim Whiteaker, Venkatesh Merwade, UT Austin, Steve Ansari, NCDC, Ken Lanfear and Mark Hamill, USGS, Jonathan Goodall, Duke University WSTB Committee on Integrated Observations for Hydrologic and Related Sciences, Dec 1, 2005

  2. HIS Goals • Hydrologic Data Access System – better access to a large volume of high quality hydrologic data • Support for Observatories – synthesizing hydrologic data for a region • Advancement of Hydrologic Science – data modeling and advanced analysis • Hydrologic Education – better data in the classroom, basin-focused teaching

  3. CUAHSI Hydrologic Data Access System(HDAS) NCDC NASA EPA NWS USGS Observatory Data A common data window for accessing, viewing and downloading hydrologic information

  4. NWIS Station Information in HDAS http://river.sdsc.edu/HDAS

  5. Observation Site Files Ameriflux Towers Automated Surface Observing System Climate Reference Network USGS NWIS Stations

  6. Observation Site Map for US USGSNWIS ASOS Climate Research Network Ameriflux + others…….

  7. Neuse Basin with all points NWIS Streamflow and Water Quality ASOS Ameriflux NWIS Groundwater NARR

  8. Filtered Site Map NWIS Streamflow and Water Quality ASOS Ameriflux NARR

  9. http://public.ornl.gov/ameriflux/ Ameriflux site map Building each web service requires a site map and a web services library Ameriflux towers measure vertical fluxes of water, heat, CO2 Web services library

  10. NAWQA Ameriflux Storet LTER NCDC NCAR NWIS CUAHSI Web Services Excel Visual Basic ArcGIS C/C++ Matlab Fortran Access SAS Some operational services

  11. Direct and Indirect Web Services • Direct web service • The data agency provides direct querying ability into its archives through SOAP or OpenDAP (NCDC) • Indirect web service • CUAHSI constructs a “web page mimic” service, housed at SDSC, that programmatically mimics the manual use of an agency’s web pages (USGS, Ameriflux)

  12. HydroObjects Library • CUAHSI has developed a HydroObjects Library with web service wrappers that know where to access each web service and how to interpret its output User Application (Excel, ArcGIS, …..) HydroObjects Library with web service wrappers for NWIS, Ameriflux, NCDC, … Direct or Indirect web services Web data

  13. CUAHSI Web Services Library for NWIS http://river.sdsc.edu/NWISTS/nwis.asmx These web services are available now for you to use in your programming

  14. Accessing Ameriflux data directly from Excel using CUAHSI web services

  15. Transfer of research results • CUAHSI web services for NWIS were announced at a cyberseminar on Friday Oct 28 • On Wednesday Nov 2, Jason Love, from a private firm, RESPEC, in Sioux Falls, South Dakota, posted on the EPA Basins list server:“Occasionally one comes across something that is worth sharing; the CUAHSI Hydrologic Information Systems - Web Services Library for NWIS is a valuable tool for those of us interested in rapidly acquiring and processing data from the USGS, e.g., calibrating models and performing watershed assessments.” • He provided a tutorial on how to use the services from Matlab (which CUAHSI had not developed) • Technology transfer took less than 1 week!

  16. Standards are the Key • standards … • Industry standards already exists: • SOAP = Simple Object Access Protocol • WSDL = Web Service Definition Language • Hydrologic community must add their own to the mix: • HTSS = Hydrologic Time Series Service • HML = Hydrologic Markup Language • software development … • If we adopt SOAP and WSDL standards, we can utilize industry support • Hydrology standards will increase interoperability and code reuse

  17. CUAHSI Web Services Web application: Data Portal • Your application • Excel, ArcGIS, Matlab • Fortran, C/C++, Visual Basic • Hydrologic model • ……………. • Your operating system • Windows, Unix, Linux, Mac Internet Simple Object Access Protocol Web Services Library

  18. Impact of Web Services • CUAHSI web data services are significantly simplifying user access to federal water observation data • This will increase appreciation of the collective information content of these data • Next step is to set the data in context of their environment – Digital Watershed • Web services mayturn out to be as important or evensupersede web pagesas a data delivery mechanism

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