same dataset has been transposed using recognised algorithms by OAD to provide data suitable for both mid and low frequencies. The data is available to view graphically (as chart overlays and as seabed reflection loss curves) and is used by the program for calculations.
HFEVA is used in its original format for higher frequencies. The
Water Depth & Land Elevation
World Vector Shoreline Data
is suitable for the open ocean but provides limited coastline definition when ‘zoomed in’ (especially around island areas). WVS data provides an effective way of drawing high definition coastlines.
Standard WADER charts are drawn using bathymetry data. This
World Vector Shoreline, NGDC, Boulder, Colorado (WVS)
This was DBDB5 (5 min resolution) when the system was produced in 1991 (issued on 28 floppy discs). We have since progressed through ETOPO5, DBDBV and ETOPO2, all of which provided increased spatial resolution.
V8.4 also allows users to upload their own high-resolution bathymetry data in ESRI Raster Format (ASCII) where available and appropriate. Data resolution can be as high as 0.5m.
OAD endeavour to supply the highest quality data available.
0.5 arcmin, subsampled to 1 and 2 arcmin
6 arcsec (specific areas), 5 arcmin (near Global)
HFEVA Stennis Space Centre*
Contact OAD for further details
* Dataset used for