README

We ask all that make use of any data provided on this ftp site to please site:
Jakobsson, M., R. Macnab, L. Mayer, R. Anderson, M. Edwards, J. Hatzky, H. W. Schenke, and P. Johnson (2008), An improved bathymetric portrayal of the Arctic Ocean: Implications for ocean modeling and geological, geophysical and oceanographic analyses, Geophysical Research Letters, DOI: doi: 10.1029/2008gl033520.
 
This ftp site contains the two directories "grids" and "maps". Grids contains the IBCAO grid in various formats and maps contains products derived from the IBCAO grid such as maps that may be used for illustrations in articles and bathymetric contours derived from the IBCAO grid. 

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##### CONTENT DIRECTORY GRIDS #####################
Version and file naming information
Current Version: 	2.23 (March 8, 2008) 
Base file name: 	IBCAO_ver2_23

Polar stereographic grids (PS=Polar stereographic projection):
Arc ASCII grid: 	IBCAO_ver2_23_PS_ARC_2km.asc (zip)
GMT netCDF:				IBCAO_ver2_23_PS_netCDF_2km.grd (zip)


Geographic grids (GEO=Geographic):
Arc ASCII grid: 	IBCAO_ver2_23_GEO_ARC_2min.asc (zip)
GMT netCDF:				IBCAO_ver2_23_GEO_netCDF_2min.grd (zip)
Arc ASCII grid: 	IBCAO_ver2_23_GEO_ARC_1min.asc (zip)
GMT netCDF:				IBCAO_ver2_23_GEO_netCDF_1min.grd (zip)

 

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METADATA:  IBCAO_ver2_23_PS_ARC_2km.asc
FORMAT: Arc ASCII grid created using Global Mapper version 9
UPPER LEFT X=-2904000.000
UPPER LEFT Y=2904000.000
LOWER RIGHT X=2902000.000
LOWER RIGHT Y=-2902000.000
UPPER LEFT LON=135° W
UPPER LEFT LAT=53° 47' 58.39" N
LOWER RIGHT LON=135° W
LOWER RIGHT LAT=53° 47' 58.39" N
NUM COLUMNS=2904
NUM ROWS=2904
PIXEL WIDTH=2000 meters
PIXEL HEIGHT=2000 meters
MIN ELEVATION=-5563 meters
MAX ELEVATION=5383 meters
ELEVATION UNITS=meters
PROJECTION: Polar Stereographic
TRUE SCALE: 75°N
PROJECTION CENTER LONGITUDE: 0°
PROJECTION CENTER LATITUDE: 90°
FALSE EASTING: 0 meters
FALSE NORTHING: 0 meters
DATUM: WGS84

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METADATA: IBCAO_ver2_23_PS_netCDF_2km.grd
FORMAT: netCDF created with GMT 3.4.3
REMARKS: node registration
UPPER LEFT X=-2904000.000
UPPER LEFT Y=2904000.000
LOWER RIGHT X=2904000.000
LOWER RIGHT Y=-2904000.000
UPPER LEFT LON=135° W
UPPER LEFT LAT=53° 47' 58.39" N
LOWER RIGHT LON=135° W
LOWER RIGHT LAT=53° 47' 58.39" N
NUM COLUMNS=2905
NUM ROWS=2905
PIXEL WIDTH=2000 meters
PIXEL HEIGHT=2000 meters
MIN ELEVATION=-5581 meters
MAX ELEVATION=5431 meters
ELEVATION UNITS=meters
PROJECTION: Polar Stereographic
TRUE SCALE: 75°N
PROJECTION CENTER LONGITUDE: 0°
PROJECTION CENTER LATITUDE: 90°
FALSE EASTING: 0 meters
FALSE NORTHING: 0 meters
DATUM: WGS84

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METADATA: IBCAO_ver2_23_GEO_ARC_2min.asc
FORMAT: Arc ASCII grid created using Global Mapper version 9
UPPER LEFT LONGITUDE=180°W
UPPER LEFT LATITUDE=90°N
LOWER RIGHT LONGITUDE =179.966666°E
LOWER RIGHT LATITUDE =54.033333°N
NUM COLUMNS=10800
NUM ROWS=1080
PIXEL WIDTH=0.0333333°
PIXEL HEIGHT=0.0333333°
MIN ELEVATION=-5523 meters
MAX ELEVATION=5133 meters
ELEVATION UNITS=meters
PROJECTION: Geographic
DATUM: WGS84

###########################################################
METADATA: IBCAO_ver2_23_GEO_netCDF_2min.grd
FORMAT: netCDF created with GMT 3.4.3
REMARKS: node registration
UPPER LEFT LONGITUDE=180°W
UPPER LEFT LATITUDE=90°N
LOWER RIGHT LONGITUDE =180°E
LOWER RIGHT LATITUDE =54°N
NUM COLUMNS=10801
NUM ROWS=1081
PIXEL WIDTH=0.0333333°
PIXEL HEIGHT=0.0333333°
MIN ELEVATION=-5541 meters
MAX ELEVATION=5310 meters
ELEVATION UNITS=meters
PROJECTION: Geographic
DATUM: WGS84

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METADATA: IBCAO_ver2_23_GEO_ARC_1min.asc
UPPER LEFT LONGITUDE=180°W
UPPER LEFT LATITUDE=90°N
LOWER RIGHT LONGITUDE =179.98333333°E
LOWER RIGHT LATITUDE =54.01666667°N
NUM COLUMNS=21600
NUM ROWS=2160
PIXEL WIDTH=0.0167°
PIXEL HEIGHT=0.0167°
MIN ELEVATION=-5558 meters
MAX ELEVATION=5312 meters
ELEVATION UNITS=meters
PROJECTION: Geographic
DATUM: WGS84

###########################################################
METADATA: IBCAO_ver2_23_GEO_netCDF_1min.grd
FORMAT: netCDF created with GMT 3.4.3
REMARKS: node registration 
UPPER LEFT LONGITUDE=180°W
UPPER LEFT LATITUDE=90°N
LOWER RIGHT LONGITUDE =180°E
LOWER RIGHT LATITUDE =54 °N
NUM COLUMNS=21601	
NUM ROWS=2161
PIXEL WIDTH=0.0166667°
PIXEL HEIGHT=0.0166667°
MIN ELEVATION=-5570 meters
MAX ELEVATION=5361 meters
ELEVATION UNITS=meters
PROJECTION: Geographic

######### END GRIDS #######################################

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##### CONTENT DIRECTORY MAPS #####################
Version and file naming information
Current Version: 2.23 (March 8, 2008) 
Base file name: IBCAO_ver2_23

Polar stereographic Letter size map: 	IBCAO_ver2_23_Letter.pdf
Polar stereographic Letter size round map, cutoff at 64°N: 	IBCAO_ver2_23_Letter_round.pdf