var esus = new ol.layer.Tile(
            {
                title : "Mapa Base digiSUS Gestor",
                visible : true,
                isBaseLayer : true,
                name : "esus",
                source : new ol.source.TileWMS(
                        {
                            url : "http://digisus-mapabase-homologacao.saude.gov.br/wms",
                            params : {
                                'layers' : "osm",
                                'srs' : "EPSG:4326",
                                'format' : "image/png"
                            },
                            attributions : [ new ol.Attribution(
                                    {
                                        html : 'Map Data: &copy; <a target="_blank"  href="https://softwarepublico.gov.br/gitlab/i3geo/mapabaseosm/blob/master/README.md">OpenStreetMap</a> contributors'
                                    }) ]
                        })
            });

        var esusmono = new ol.layer.Tile(
        {
            title : "Mapa Base digiSUS Gestor - Monocromatico",
            visible : false,
            isBaseLayer : true,
            name : "esusmono",
            source : new ol.source.TileWMS(
                    {
                        url : "http://digisus-mapabase-homologacao.saude.gov.br/wms",
                        params : {
                            'layers' : "osm_mono",
                            'srs' : "EPSG:4326",
                            'format' : "image/png"
                        },
                        attributions : [ new ol.Attribution(
                                {
                                    html : 'Map Data: &copy; <a target="_blank" href="https://softwarepublico.gov.br/gitlab/i3geo/mapabaseosm/blob/master/README.md">OpenStreetMap</a> contributors'
                                }) ]
                    })
        });