MapBoundsLatLng

 function _showZones() {
            vm.schoolsInMapBounds = [];
            NgMap.getMap('map').then(function(map)
            {
                vm.map = map;
                var bounds = vm.map.getBounds()
                var bounds = bounds.toString();
                var string = bounds.split(' ');
                var latS = string[0].split('((');
                var latS = latS[1];
                var latN = string[2].split('(');
                var latN = latN[1]
                var lastLatN = latN.split(',');
                var lastLatN = lastLatN[0];
                var lonW = string[1].split('),');
                var lonW = lonW[0];
                var lonE = string[3].split('))');
                var lonE = lonE[0];
                var polygon = 'POLYGON(('+lonW + ' ' + latN + ' ' + lonW + ' ' + latS + ' ' +  lonE + ' ' + latS + ' ' +  lonE + ' ' + latN + ' ' +   lonW + ' ' + lastLatN + '))';
                var call = {polygon:polygon};

                vm.emptySchools();
                vm.schoolsService.getMapBoundsSchools(call, vm.onSuccessGetMapSchools, vm.onError);
            });
        }