Batch Indexing, Enviromapper, Web Services, and GIS Tools
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Batch Indexing, Enviromapper, Web Services, and GIS Tools. Randy Hill, Kevin Christian US EPA OWOW/AWPD/MB November 28, 2007. What is a Web Service?. A web service is a computer-to-computer protocol that allows for the direct sharing of information.

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Batch Indexing, Enviromapper, Web Services, and GIS Tools

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Batch Indexing, Enviromapper, Web Services, and GIS Tools

Randy Hill, Kevin Christian

US EPA OWOW/AWPD/MB

November 28, 2007


What is a Web Service?

  • A web service is a computer-to-computer protocol that allows for the direct sharing of information.

  • Web services allow for data from multiple sources to be packaged together in one layout, web presentation, or application.

  • Typically, a web service has input parameters, and pre-defined output format

  • These are the basic principles under which the Exchange Network functions


A common web service example

  • Weather bug:

    • The weather bug software is something that many are familiar with. It runs on a very basic web service.

    • It has basic input parameters: zip code

    • It has a defined output format (xml file)

    • The actual weather data does not need to be stored on your computer, it just pulls the data via a web service, and then displays that information in a user friendly format.


What Web Services are being planned?

  • Four core services are being developed:

    • Watershed/Station Catalog service – provides summary information on what data are available

    • Project Catalog service – provides summary information by projects based on an input of min/max latitude/longitude

    • Stations service – provides specific station information

    • Results service – provides results for modeling, analysis, and decision making


Where do Web Services fit?

Data in/out services via WQX

WH services available via Exch. Net.

Data out services through direct access to the WH


So What?

  • Web Services allow for more accessibility to the data.

  • Allows for any application that can consume a web service to be able to access the data that are available in STORET

    • Includes:

      • Microsoft Excel

      • Mapping Applications

      • Models

      • Or any other custom application


Why Web Services?

  • Allow for you to create one method for accessing data that can be reused in multiple ways

  • Some example applications:

    • EPA’s Watershed Summary reports

    • The next release of Enviromapper for Water

    • An example Virtual Earth application


This is all driven by STORET web services


All Done with Web Services!!


Virtual Earth

  • RANDY: Either live demo or slides like Enviromapper


Batch Indexing

  • New development that EPA is working on

  • Allow for any new stations submitted via WQX to be automatically georeferenced to the NHD+

  • The Georeferenced reach codes would be returned to the data provider, as well an opportunity to QA the georeferenced locations

  • This will use a concept called ‘Rain Drop’ to ensure that points are tied to the correct NHD reach


  • If the two points represent Accuracy/Precison issues then note how raindrop results in same indexed location

  • Note how upper point with straight snap would go to wrong catchment

  • Note how the path does trace the topo delineation for water


Why this is Important?

  • Allows for monitoring data to be easily linked to other types of data (i.e. Impaired waters, assessments, permits, etc.)

  • Allows for upstream/downstream analysis

  • Greatly expands the usability of monitoring data


Batch Indexing Timeline

  • This capability should be available Fall of 2008

  • Deployed as a service that any data flow could use (not just for WQX)

  • Also provide some Geospatial QA services (i.e. is the lat/long in the county/HUC/state that the user specified)


Questions?

  • Contacts:

    • Randy Hill

      202-566-0644, [email protected]

    • Kevin Christian

      202-566-1180, [email protected]

    • STORET

      1-800-424-9087, [email protected]


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