The legacy OPC website URL https://www.opc.ncep.noaa.gov permanently redirects to https://ocean.weather.gov. On or after July 9, 2019 the old URL will not work. Users must use https://ocean.weather.gov to access the OPC website. More information is available at https://www.weather.gov/media/notification/scn19-10opc_terminate.pdf.
OPC Experimental GIS Data and Products
Regional Seastate KML Files (Experimental)
OPC's regional seastate charts are now available in a Keyhole Markup Language (KML) format. When opened in a program such as Google Earth,
these KML files will display the various products listed below but projected onto the Earth's surface. The KML file itself does
not change; it points to the latest OPC product. You should only have to download it once to always have the latest information.
If for some reason the information looks old, try "refreshing" the file. In Google Earth, this is done with a right click on the KML content.
Keyhole Markup Language (KML) is used by a variety of GIS and mapping applications and the specifications are freely available to the public
and available to the user community without charge or restriction. KML is an XML-based language for managing the display of three-dimensional
geospatial data in the programs Google Earth, Google Maps,Google Mobile, ArcGIS Explorer, and WorldWind. The word Keyhole is an earlier name
for the software that became Google Earth; the software was produced in turn by Keyhole, Inc, which was acquired by Google in 2004.
The term "Keyhole" actually honors the KH reconnaissance satellites, the original eye-in-the-sky military reconnaissance system now some 30 years old. KML files are very often distributed as KMZ files, which are zipped KML files with a .kmz extension.
More GIS products from the National Weather Service