Function mapWeather

mapWeather(json?): void
Select the weather layer to display.

Available weather layers are wind, temperature, and rain. Wind streamers are always shown, hence the naming convention beginning with "wind-". Select "off" to hide the weather layers.
Parameters
- json: {
  weather: string;
  } = ...
  - weather: string
    string: "wind-wind | wind-temp | wind-rain | off"
Returns void
Example
```
// show the temerature layer with wind streamers
{weather: "wind-temp"}

// hide all weather layers
{weather: "off"}
```