question: public double metersToPixels ( ) { double screenCenterLat = screenTopLeft . latitude - screenSize . latitude / 2 ; double metersToLon = 1 / ( Util . LON_TO_METERS_AT_EQUATOR * Math . cos ( screenCenterLat / 180 * Math . PI ) ) ; return screenSize . longitude / windowWidth * metersToLon ; }
target:  Returns the ratio of meters to pixels at the center of the screen