DBDB-V Information

The following information is extracted from the DBDB-V documentation files:

DBDB-V is a digital bathymetric data base that provides ocean depths at various
gridded resolutions.  DBDB-V was developed by NAVOCEANO (Naval Oceanographic
Office) to support the generation of bathymetric chart products, and to provide
bathymetric data to be integrated with other geophysical and environmental
parameters for ocean modeling.

DBDB-V, version 4.0, is produced at several different levels of classification
and detail.  The classes of DBDB-V are known as DBDB-V Level 0 (Unclassified;
Approved for public release; distribution is unlimited). 

Sources:

DBDB-V is developed by the Naval Oceanographic Office and combines in one data
base structure different resolutions of gridded bathymetric data bases.

The coarser resolution data grids (1, 2 and 5 arc minute grids) are constructed
by digitizing bathymetric contours of hard copy charts.  The digitization rate
and nominal chart scales are 21 measurements per inch of contour at a nominal
chart scale of 1:1000000 for the 1 minute grid, 21 measurements per inch of
contour at a nominal chart scale of 1:1000000 for the 2 minute grid, and 10
measurements per inch of contour at a nominal chart scale of 1:4000000 for the
5 minute grid.  These digitally rendered contours are then put through a
gridding routine developed by the Naval Oceanographic Office.  This routine
takes the values that fall within a grid node area of influence and utilizing a
multi-stage minimum-curvature spline algorithm, interpolates the values to
derive a single representative depth value for each grid node (1, 2 or 5 arc
minute grid node spacing).