National Geophysical Data Center (Continued) 
Kinds of Data 
Gridded Bathymetric Data Base for the Coastal United States 
Location: Atlantic coast, gulf coast, Pacific coast, Great 
Lakes, Alaska, and Hawaii 
Description of Data: The National Geophysical Data Center (NGDC), in coopera- 
tion with the US Geological Survey, has compiled this gridded bathymetric data 
base for the coastal United States. The entire data were obtained by the 
National Ocean Survey as part of the program to automate nautical charts. 
This data base comprised 3.4 million records. The grid is based on a 
latitude and longitude mesh which defines a 15-sec grid cell. Each file 
contains one square degree of area, and each data record contains north 
latitude, west longitude, average depth, maximum depth, minimum depth, 
standard deviations, and number of observations. 
Response Format: The data are available on magnetic tapes. The 
user specifies the latitude and longitude limits 
of the desired data area and the required tape 
characteristics. The usual tape characteristics 
are 9-track ASC11 coding 1600-BPI and blocked at 
7,680 characters per block. 
Qualified Users: No limitations 
Point of Contact: National Geophysical Data Center, Code 64 
325 Broadway 
Boulder, CO 80303 
(303) 497-6338, FTS 320-6338 
VII-3 
