function doConvert(methodName, ecModel, finder, value) {
	        var geoModel = finder.geoModel;
	        var seriesModel = finder.seriesModel;

	        var coordSys = geoModel
	            ? geoModel.coordinateSystem
	            : seriesModel
	            ? (
	                seriesModel.coordinateSystem // For map.
	                || (seriesModel.getReferringComponents('geo')[0] || {}).coordinateSystem
	            )
	            : null;

	        return coordSys === this ? coordSys[methodName](value) : null;
	    }
@param {<Array.<number>} coord
@return {boolean}