points - shapes

        

        const antenna = new maps.MarkerImage('path-to-image/marker-image.png');

        this.http.get('path-to-file/file.json').subscribe(data => {
            this.masts = data['data'];

            this.masts.map(x => {
                new maps.Marker({
                position: new maps.LatLng(x[18], x[17]),
                icon: antenna,
                size: new maps.Size(30, 30),
                map: this.map
                });
            });