US/Canada NOAA Nautical Charts + Google Maps:
The GeoGarage team has completed another "spatial image tiling" project that combines Google Maps with another type of map. In this case GeoGarage has overlayed NOAA nautical charts (US and Canada) over top of Google Maps with great user interface controls to fade the NOAA map in and out of prominent view. Peio Elissalde from GeoGarage explains the process:
"..After having been processed with GeoGarage spatial image tiling solution, about 1018 NOAA raster nautical charts (RNC/BSB/KAP format) are displayed with advanced quilting (mosaic image with removed borders for a seamless rendering of multiple charts), and transparency management via layer opacity sliders (for terrestrial maps and orthophoto overlay). The result is the user can access through Google Maps viewer to all the range of NOAA raster maps online, zooming in and out, panning in a continuous way for selecting the specified map scale automatically, by simply sliding the mouse."
(Related: Marine Maps)
Google Maps Mania writer Keir Clarke recently blogged about another GeoGarage project:
César-François Cassini's 18th century map of France which showcases this same transparency effect using historical maps.
More GeoGarage Google Maps examples (taken from the GeoGarage 'Examples' Page):