Tuesday, January 19, 2010


EIMS - Water Samples for Snohomish Watershed using Tableau

This data came from EIMS, their website is here:

http://www.ecy.wa.gov/eim/

A few notes:
  • I culled data for only the last ten years, and only for the snohomish area.
  • The contractors who actually performed the contaminant samples often used different units of measure, as a result of using different testing methods. So I have placed a filter for UOM to help verify the test results. In plain english: the time trend and its 'median' value reported is bogus information if you mix your UOM types.
  • I removed any concept of what testing method they used, what the baseline observable measurement was, etc.
  • you can select a sample type, then lasso some data marks on the timeline to see individual sample reports.
  • The Tableau tooltips are nicely formatted; take a look at those!
  • clicking on the "links" item will show a bing map of the sample location. Hovering back over that same selected link item will also show two other links, to NIH.gov and wikipedia (for the contaminant in question)
  • In short: this was mostly an experiment with Tableau features, as opposed to a deep dive into water quality and contaminant analysis.





1 comment:

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