Wednesday, March 26, 2008

NOAA Nautical Charts + Google Maps

US/Canada NOAA Nautical Charts + Google Maps: (dead link removed)

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)



    Anonymous said...

    As a Coast Guard Auxiliary Aids to Navigation verifier, this mashup has been very helpful for the San Francisco Bay - thanks much!

    Anonymous said...

    Great stuff. One question, how do you account for the registration errors in the Virgin Islands? Specifically, the British Virgins? I believe the RNCs are off, I have experienced a registration error between the RNCs and the new ENC vectors when sailing that area.

    ulu Fred said...

    This is fantastic! I just submitted a feature request to, asking them if they could add support for nautical charts, such as you have done. You might want to contact them.

    Unknown said...

    Instamapper is dead but I now use GreenAlp Realtime Tracker