title: $:/plugins/tiddlywiki/geospatial/docs/geolayer
caption: geolayer widget
tags: $:/tags/GeospatialDocs

!! `<$geolayer>` widget

The `<$geolayer>` widget is used inside the `<$geomap>` widget to indicate the layers and markers to display.

The following attributes are supported:

|!Attribute |!Description |
|''json'' |Optional GeoJSON Feature Collection to be rendered |
|''name'' |Optional name to be displayed for this layer |
|''color'' |Optional CSS colour for this layer |
|''lat'' |Optional latitude of marker if json attribute missing |
|''long'' |Optional longitude of marker if json attribute missing |
|''alt'' |Optional altitude of marker if json attribute missing |
|''draggable'' |Set to "yes" to make the marker draggable |
|''updateActions'' |Optional actions when the marker is dragged other otherwise modified. The variables ''lat'' and ''long'' contain the new coordinates of the marker |

Note that the `<$geolayer>` widget can be used in one of two modes:

* With the ''json'' attibute specifying the layer to be drawn
* With the ''lat'', ''long'' and optional ''alt'' attributes specifying a marker to be drawn
