Function getScaleDenominator

getScaleDenominator(params?): number
JMap.Map.getScaleDenominator

Returns the map scale denominator, depending on screen DPI, latitude, and zoom level.

For instance if the scale is "1 : 12959346", the denominator is the number 12959346.

if params is passed will use the given values for latitude (center of the map) and zoom, else use map current ones.

Note: screen DPI is fixed.
Parameters
- Optional params: JLatitudeAndZoom
  if passed will use the given values for latitude and zoom, else use map current values
Returns number
Example
```
// returns the current map scale
JMap.Map.getScaleDenominator()

// returns the map scale for given map latitude=45.5 and zoom level = 4
JMap.Map.getScaleDenominator({
  latitude: 45.5,
  zoom: 4
})
```