The Tiles Layer in TrueNorth draws map data from a map tiling service – either on the internet, over a network, or off a local data source. The tiles in TrueNorth’s tile layer are the same as those used by tiled web maps. For a more in depth description on this topic please see the Wikipedia entry on the subject.
Tiles are often opaque – that is they are not transparent. This means when they are inserted into a map they will prevent layers prior to them in the layer drawing order from being seen.
TrueNorth supports a number of different types of web tile sources.
|WMS||Web Map Service||While not technically a tile source, TrueNorth downloads data from WMS sources as tiles|
|TMS||Tile Map Service||A specification for tiled web maps, developed by the Open Source Geospatial Foundation.|
|OSM||OpenStreetMap||OpenStreetMap has a slightly different tile protocol similar to that developed by Google Maps|
|ArcGIS REST||ArcGIS Server||ArcGIS Server by ESRI has its own tile server protocol with partial support in TrueNorth|
|MBTiles||MapBox Tiles||A format developed by MapBox for transporting tile sets for offline viewing|
|Bing Maps||Microsoft Bing!||Bing Maps uses a QuadKey addressing system for map tiles|
|Google Maps||Google Maps initially supported image based tiles but has made it much more difficult to access their data.|
TrueNorth comes with a number of preconfigured Layer Templates for the most popular Tile Services such as Bing, OpenStreetMaps, and ArcGIS Online. Users can configure their own and create templates for tile sources themselves.