Overlays are geographical layers that do not have any direct linkage to data in the database. Example include roads, rivers, airports, ports, and other geographical information that you may want to display on your map, but that is not neccsarily linked ot data contained in the DHIS database. The panel will allow you to add new layers and determine how they will be represented visually on the map.
Display name: Represents your overlay in the layer tree in the upper right corner.
Map source file: The GeoJSON file name.
Fill color: Decides the fill color if the layer is a polygon layer.
Fill opacity: Select an opacity level between 0 (invisible) and 1 (solid).
Stroke color: The stroke color over lines and polygon borders.
Stroke width: Select a stroke width between 0 and 4.