Confirm that the selected drop-dowwn options are valid before fetching
the observations

Function uses options from drop-down list that have been selected by a
user to populate the appropriate observations and then draw the
appropriate chart

Plot line charts using daily minimum and monthly maximum values

It is assumed that this chart type will be used for visualizing
aggregated results

- Move the function within the module file

- Add documentation to the function

Currently, this function is only available in the scope of the
function that formats observations for the scatter plot chart.

Remove the missing observations from the first (larger) array.

Currently, this function is only available in the scope of the
function that formats observations for the scatter plot chart.

Get the index of the observations that are available in the first
array but are missing from the second array.

Currently, this function is only available in the scope of the
function that formats observations for the scatter plot chart.

Get the timestamp of the observations that are available in the first
array but are missing from the second.

The function paramaters are two observation arrays which are responses
from a SensorThings API instance.

The logic of the function is based on the premise that the first input
observation array is the larger of the two.

Create a temporary function that wraps the scatter plot drawing logic

... from multiple datastreams. Its single parameter is an array of
strings representing the building, sensor and sampling rate.

Retrieves metadata from an array of Datastream URL strings

Add parameters to function that hold information about the two series.

Remove hardcoded arrays used for testing.

Add weather station information

Add a blank line between the properties of the options object, in an
attempt at improving readability.

Initial approach at generalizing the function by extracting constants
from the options object of the scatter plot chart.

Add the basic structure of scatter plot chart

`Range selector` is analogous to the `zoom` of a chart. Set it to
display all the available observations from a datastream.

Get the max and min values of the heatmap color axis dynamically.
Fix the tooltip text for `null` observation values.

Deactivate datastreams that do not have observations

Formats datastream metadata for use in both linechart and heatmap

Add parameter for datastream metadata to function that draws line chart

Fetch datastream metadata together with the observations

Add parameter for datastream metadata to function that draws heatmap
chart