Axis and Scaling

Watch the following video to understand how to set axis and scaling options.

Axis and Scaling

There are axis and scaling options that allow a user to make modifications. The axis can be set to :

1. Single Axis
2. Stacked Axis
3. Overlapped Axis

In the example below the ‘Pipe Level’ and ‘Flow’ are plotted against the same y-axis. The one y-axis is not sufficient because the ‘Flow’ data is being squished at the bottom of the graph making it difficult to see any detail.

1. Single Axis

Start by clicking on the ‘Axis & Scaling’ button on the top menu.

The default setting is the ‘Single Axis’.

2. Stacked Vertically Axis

Select ‘Stacked vertically’ and leave the ‘Auto’ setting and click on ‘Replot Data’.

Now you can see each parameter on its own y-axis.

You are still able to zoom in on the data. You can zoom in on one measurement…

…or you can zoom in on all of the measurements using the same techniques shown in the Basic Graphing Instructions and zoom out by clicking on ‘Undo Zoom’.

3. Overlapped Axis

The separate y-axis can also be overlapped. Click on ‘Axis & Scaling’ and select ‘Overlapped’ and click ‘Replot Data’.

The graph will now have all three parameters overlapping but with separate y-axis.

This may be difficult to look at for a large data set but if you zoom in it may be useful for looking at detailed events. For this example we will turn off the rainfall parameter by un-clicking ‘Rain’ on the left menu, and then we will zoom in on a storm event. Remember that you can also pan through the data at this zoom by dragging the scroll button on the bottom of the graph. Click ‘Undo Zoom’ when you want to return to the normal view.

Scaling

Each of the axis options also allows the user to modify the scaling of the axis. For this example we will go back to the ‘Single Axis’ option in the ‘Axis & Scaling’ tool and re-add the rainfall. We will then make the scale 0 to 50 by filling in the ‘Min’ and ‘Max’ options. Then click ‘Replot Data’.

You will also notice that in ‘Single Axis’ mode the rainfall will also be shown on top with a separate axis.