1. U.S. Department of the Interior U.S. Geological Survey NWIS Web Services Snapshot for ArcGIS Sally Holl and David Maltby Based on work by David McCulloch and Brian Reece

2. Outline  Background  Procedure  Results  Future Work USGS Texas Water Science Center

3. Background  2002 - Reece  NWIS Geodatabase Snapshot  Early 2010 - McCulloch  NWIS Web Services ArcGIS application  Daily values, unit values, & site information  Sept – Dec 2010  NWIS Web Services Geodatabase Snapshot  +Water quality data retrieval, +Reece geodatabase to McCulloch ArcGIS app

4. Why is this important?  Need a way retrieve and manage NWIS data  Not everyone is a database or NWIS expert  Science Strategy Vision for 2017

5. Overview 1. Download sites in your study area. 2. Download data to a relational geodatabase. 3. Use ArcGIS to query, analyze, plot, edit, expand, visualize, and export NWIS data.

6. Overview: Web Services  Site information (2 different ones)  Unit / Instantaneous Values (UV)  Daily Values (DV)  Water Quality (WQ)

7. Specifications  Standard USGS Windows operating system configuration  Microsoft.NET Framework version 2.0 or greater  ESRI ArcGIS 9.3.1  Internet connection  Knowledge of how to download files via FTP  Assumes user is a USGS employee familiar with NWIS, Windows XP, and ArcGIS 9.3.

8. Procedure  Identify user requirements  Identify web services  Evaluate existing ArcGIS web services tools  CUAHSI HIS  Develop application  Test application  Report results  Identify goals for the next phase

9. Identify user requirements  Two visits to talk to end users  Document needs

10. Water Quality Data – Retrieval & Management Get Sites Get start date and end date Get Parameter list For each site in site list Build URL Send URL to web service Load response data into a dataset with XSD (schema) If we have data, start logger Data PreparationWeb Service Response Create unique ActivityID Loop through the tables and insert records Combine tables into Sample/Results format Manage Data Log anything that is an error to the log report Log final statistics to the log report

11. Application development issues  VB.net programmer community?  Performance  To use ArcObjects or not to use ArcObjects?  Unexpected issues  Develop a unique ID system  Capitalization in URL  XML schema field type differences  Shorten schema field name lengths for ArcGIS

12. Site Information Unit Values Daily Values WQ SamplesWQ Results Geodatabase Design Populated by queries to http://qwwebservices.usgs.gov Populated by queries to http://water services.usgs. gov

13. Test Application  Plan  Procedure  Results  Issue-tracking database

14. Results  USGS ArcGIS users can now retrieve and manage NWIS data.  Deliverables:  Software package  Feedback to web services developers  Testing plan  Tutorial and testing procedure  Testing results  Proposal for next phase

15. Future work  Migration to ArcGIS 10  “Common English” query builder  Expand spatial extent of data retrieval  Education: Visualize and Analyze Data Web services: What data are available and where? Identify Sites Retrieve and Manage Data Education: How to Visualize and Analyze Data

16. The Vision: Retrieve, Analyze, Visualize Environmental Data

17. Questions?  Contact  Sally Holl – slholl@usgs.gov  David Maltby – drmaltby@usgs.gov  Code, Documentation:  ftp://ftpint.usgs.gov/pub/cr/tx/austin/NWIS/