Geometry types
Define locations and shapes
A key feature of Alloy is the ability to visualise your assets on the map.
Therefore, all items have a standard Geometry attribute that can be populated with coordinate data to represent their location and shape. Use an item's Map section to view and edit its geometry.
Several types of geometry data can potentially be stored, ranging from a single point to complex polygons. An item's design determines which of these types are allowed to be set. By default, all geometry types are allowed on custom designs/interfaces created by your organisation.
To limit a design/interface to one or more geometry types (or none at all), see Edit the design or interface.
You can add extra Geometry attributes to a design/interface.
Geometry types
Learn about the different types of geometry in Alloy.
📄️ Point
Define a single point
📄️ Line
Define a line of connected points
📄️ Polygon
Define a shape using connected points
📄️ Multi-point
Define multiple unconnected points
📄️ Multi-line
Define multiple lines
📄️ Multi-polygon
Define multiple shapes
📄️ Collection
Allow multiple geometry types
Basemap alignment
In Alloy, all geometry is saved using the WGS84 Lat/Lng (EPSG:4326) coordinate system.
If the active basemap uses another coordinate system, item geometry is transformed on the fly (by Alloy or the map server) to keep things in proportion. Occasionally, this can result in the geometry appearing slightly misaligned with the basemap.
Therefore, we recommend switching to the most relevant basemap before editing item geometry, so you can draw directly over the basemap's features if necessary.