function _lat2mercator in Geolocation Field 7

Helper function converts latitude to mercator value (Mercator projection).

1 call to _lat2mercator()

_geolocation_html5_lat2px in modules/geolocation_html5/geolocation_html5.module

Helper function converts latitude pixel value for display in image map.

File

modules/geolocation_html5/geolocation_html5.module, line 166

HTML5 widget and formaters for Geolocation.

Code

function _lat2mercator($latitude) {
  return log(tan($latitude * pi() / 180) + 1 / cos($latitude * pi() / 180));
}