Raster sheets, generally historical, are stitched into continuous layers. The layers are geolocated for display alongside Google Maps, Bing, Mapbox, Stamen and the like. Sheets making up the mosaic may be decollared and reprojected to fit.
Current vector layers are available from many other sources. We provide links to them, and may add our own layers in future.
200,000 individual sheets are already available online, not all of which are included in layers. Multiple editions of the same map may be available for comparison. All retain their collars, but many remain to be geo-located and reprojected.
Search and View
OpenTiles provides search tools to locate maps of interest, and we hope to add a public API shortly.