Weather charts

[antdambro]

Hi, I'd like to plot wind barbs and wind rose. Do you thing is it possible in new release of this library ? Thank you very much.

Great job!

[antdambro]

Sorry, weather charts of course

[powder96]

Wheater charts Sorry, weather charts of course — antdambro

There is an edit button you can use to fix typos.

I do not know what these weather charts look like. Look through these examples: http://www.humblesoftware.com/flotr2/ , maybe you will find the one you need.

[antdambro]

Wind bars are used to show the speed and direction of wind at a point in the space and in the time. Wind rose is used to show main directions and speeds of wind in a period of time. I have just viewed examples at http://www.humblesoftware.com/flotr2/., radar chart looks like a wind rose. Examples of wind barb: http://www.ncl.ucar.edu/Applications/Images/barb_4_lg.png Example of wind rose: http://or.water.usgs.gov/grapher/tutorial/examples.html Bye

[cesutherland]

Ok that's a pretty cool graph. Do you have an example for what the data looks like?

I count 5 dimensions:

• pressure
• time
• color (not sure what the units are for this)
• direction
• wind speed (not sure of units for this either... how many bars per speed?)

[antdambro]

Well, speed and direction of wind are usually measured as:

• wind's speed = m/s
• wind's direction = degrees from north's direction measured clockwise

The graphic at http://www.ncl.ucar.edu/Applications/Images/barb_4_lg.png is composed by x axis: time, y axis: air pressure in hPa (hectopascals) wind barbs oriented along wind's direction and graphically rendered using the scale at http://www.weatheronline.co.uk/marine/weather?133&LANG=en&WIND= (here unit of measurement is knots, please visit http://en.wikipedia.org/wiki/Knot_(unit)), legend on the right side that shows wind's speed in m/s, so wind barbs are rendered according scale conversion from knots to m/s (responsibility of the user).

An example of data is:

12:00, 500, 6, 45 12:00, 700, 2, 180

The first is a wind with speed 6 m/s from NE at 12 o'clock, 500 hPa The second is a wind with speed 2 m/s from S at 12 o'clock, 700 hPa

In general air pressure on the y axis can be replaced as height from ground.

I hope flotr2 will be able to represent a single couple <wind's speed in knots, wind's direction in degree> as a wind barb with the appropriate number of barbs and direction. Wind barb color is an attribute that user can modify according a scale. The measuremnt's units on x axis and y axis are chosen by the user, so that wind 's barb is only a special case of xy charts where single points are not showed: a point is replaced by a wind barb.

[cesutherland]

I dig the charts but haven't had the opportunity to implement this myself.

If anyone wants to try it, please check https://github.com/HumbleSoftware/Flotr2/tree/master/js/types for example chart types.