Data Graphing Instructions:

This graphing tool plots data as either multiple monitoring sites for a single parameter, or multiple parameters for a single monitoring site. This choice is controlled by the 'Plot:' radio buttons. The default value of 'Sites' allows a single parameter to be selected from the 'Parameter' dropdown list. Multiple sites can then be selected from the 'Monitoring sites' dropdown list and will appear as series plotted on the graph. Choosing the 'Parameters' radio button will reverse this to plot multiple parameters for a single site. Available choices in the 'Parameters' and 'Sites' dropdown lists will change to reflect the fact that not every parameter is measured at every monitoring site.

Plotted series are listed to the right under 'Selections plotted on graph:'. All items appearing here are plotted as series on the graph and are listed in the graph legend. The > button will add a parameter/site combination from the dropdown boxes on the left to the list of plotted series, while the < button will remove a plotted series from the list at right. Additionally, the >> and << buttons will add or remove all possible selections, respectively. The 'MAX', 'AVG', and 'MIN' listboxes display the maximum, arithmetic average, and minimum values from the data set used to plot that series.

The 'Display values' button offers a tabular display of the data and the ability to export that data to a Microsoft Excel spreadsheet.

The 'Scroll graph:' buttons << and >> will scroll the time axis (horizontal axis) of the graph by the interval selected in the dropdown box.

'Time interval:' controls the range of data displayed in the graph. The number values change based on the selection of days, weeks, months, or years.

'Starting date:' is the first date included in the plotted time interval.

The unit axis (vertical) dynamically adjusts it's range based on the parameters plotted and the data values over the selected time interval. The 'Y-axis scale:' controls can be used to alter this range. '-' and '+' will step the scale through set of ranges. The 'Default scale' button will return to the default automatic scaling.

The 'Legend location:' controls give the ability to change the position of the grpah's legend, or toggle it off and on.

The 'Reset graph' button will return the graph to it's intial state, displaying the previous one week for a single parameter, at one monitoring site.

This data graphing tool was inspired by the impressive work of staff at the Puget Sound Clean Air Agency.
We hope they subscribe to the notion that imitation is the highest form of flattery.