This topic contains details about the basics of C1Maps concepts.

Map Source

C1Maps can display geographical information from several sources. By default, C1Maps uses Microsoft LiveMaps aerial photographs as the source. You can change that using the Source property.

The following sources are included:

• Bing Maps Aerial Source
• Bing Maps Road Source
• Bing Maps Hybrid Source

Visible Map

The portion of the map that is currently visible is determined by the Center and Zoom properties, and by the size of the control:

The Center property is of type PointD but it actually represents a geographic coordinate in which the X property is longitude and the Y property is latitude.

The Zoom property indicates the current resolution of the map. A zoom value of 0 has the map totally zoomed out, and each increment of 1 doubles the map resolution.

Coordinate Systems

Geographic coordinates mark points in the world using latitude and longitude. This coordinate system is not Cartesian, which means the scale of the map may change as you pan.

Information Layers

C1Maps consists of a background layer where the map tiles are displayed. It is managed by C1Maps automatically. You can add layers of information to the map.  C1Maps includes three additional layers:

• C1VectorLayer displays vector data, like lines and polygons, whose vertices are geographically positioned. It also supports directly adding shapes in the form of GeoJSON data.
• C1ItemsLayer is the layer used to display arbitrary items positioned geographically on the map.
• C1VirtualLayer displays items that are virtualized. This means they are only loaded when the region of the map they belong to is visible.