http://www.nga.mil/portal/site/dnc/
The Digital Nautical Chart? is produced by the National Geospatial-Intelligence Agency (NGA) and is an unclassified, vector-based, digital database containing maritime significant features essential for safe marine navigation.
Initial data collection of the database is from a portfolio of approximately 5,000 nautical charts that will ultimately provide global marine navigation between 84° North latitude and 81° South latitude and support a variety of Geographic Information System applications.
The Digital Nautical Chart? is produced by the National Geospatial-Intelligence Agency (NGA) and is an unclassified, vector-based, digital database containing maritime significant features essential for safe marine navigation.
Initial data collection of the database is from a portfolio of approximately 5,000 nautical charts that will ultimately provide global marine navigation between 84° North latitude and 81° South latitude and support a variety of Geographic Information System applications.
'연구 > X3D-Earth' 카테고리의 다른 글
| Map Projection (0) | 2007.06.07 |
|---|---|
| Converting UTM to Latitude and Longitude (Or Vice Versa) (0) | 2007.06.07 |
| DOQQ: Digital Orthoimagery Quarter Quadrangles (0) | 2007.06.01 |
| DRG: digital raster graphic (0) | 2007.06.01 |
| How WGS 84 defines the Earth (0) | 2007.05.19 |