Angie Greig
Alaska Fisheries Science Center
ebs_blocks_nbs
Unpublished material
vector digital data
ebs_blocks_nbs
withheld
20 by 20 nautical mile blocks were originally created for the EBS groundfish and crab trawl survey in the 1970s.
Rather than extending those blocks by hand, the entire set of blocks was recreated using an algorithm. Therefore
these blocks do not precisely match the originals. The size of each block is not exactly 400 sq n.m. but is closer
to that goal than the original blocks.
Extend RACE survey blocks northward into Norton Sound for the Northern Bering Sea studies.
en
200910
publication
none
Eastern Bering Sea Shelf
-180.000000
180.000000
68.104622
49.536373
-2090485.377428
-180483.776558
422022.377159
2021844.875000
ISO19115
Biota
Boundaries
none
Bering Sea
Norton Sound
none
survey stations
none
crab
groundfish
Kingdom
Animalia
Genus
Theragra
Species
chalcogramma
walleye pollock
Genus
Paralithodes
Species
camtschaticus
red king crab
Contact Point Of Contact for data request form.
User must read and fully comprehend the metadata prior to use. Data should not be used beyond the limits of the source scale. Acknowledgement
of NOAA, as the source from which these data were obtained, in any publications and/or other representations of these data is suggested.
National Oceanic and Atmospheric Administration (NOAA) Alaska Fisheries Science Center (AFSC) Resource Ecology and Fisheries Management Division (REFM)
mailing and physical
7600 Sand Point Way, N.E. bldg. 4
Seattle
WA
98115
USA
not available
angie.greig@noaa.gov
ESRI ArcCatalog 9.3.1.3000
File Geodatabase Feature Class
The area of the blocks range from 406 NM2 in the center latitudes of the Bering Sea to 390 NM2 in the Bering Straight and
394 NM2 near Unimak Pass.
Not all blocks are assigned a station id.
analysis
A PHP program created latitude line every third of a degree. Longitude lines were centered on 164.925
and incremented 0.8 degrees at 66.5N and 0.475 degrees at 50N. ArcInfo was used to create a cover, clean and build
polygons. ArcMap was use to project to AK Albers. Xtools Pro was used to measure areas.
NA
Unknown
Metadata imported.
withheld
20091028
13260900
Dataset copied.
withheld
20091028
13284900
Vector
Simple
FALSE
0
TRUE
FALSE
GCS_North_American_1983
NAD_1983_Alaska_Albers
North American Datum of 1983
Geodetic Reference System 80
6378137.000000
298.257222
local surface
0.1
meters
attribute value
NBS_gridv2022
Eastern Bering Sea survey 20 Nautical Mile square blocks.
AFSC
Feature Class
0
OBJECTID
OBJECTID
OID
4
0
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Shape
Shape
Geometry
0
0
0
Feature geometry.
ESRI
Coordinates defining the features.
FID_1
FID_1
Integer
4
0
0
NM2
Area in square nautical miles.
AFSC
202
406
NM2
Double
8
0
0
HECTARES
Area in hectares.
AFSC
69298
139286
HECTARES
Double
8
0
0
NUM_ID
Unque number.
AFSC
0
1401
NUM_ID
Integer
4
0
0
STATION_ID
Station id such as B-18
AFSC
unknown
STATION_ID
String
6
0
0
STATION
Same as STATION_ID without the dash.
AFSC
unknown
STATION
String
6
0
0
LON
Longitude in decimal degrees of the center point.
AFSC
-179.973384
179.955916
LON
Double
8
0
0
LAT
LAT in decimal degrees of the center point.
AFSC
52.997625
66.026532
LAT
Double
8
0
0
Shape_Leng
Shape_Leng
Double
8
0
0
CRAB_STRATUM
CRAB_STRATUM
SmallInteger
2
0
0
Shape_Length
Shape_Length
Double
8
0
0
Length of feature in internal units.
Esri
Positive real numbers that are automatically generated.
Shape_Area
Shape_Area
Double
8
0
0
Area of feature in internal units squared.
ESRI
Positive real numbers that are automatically generated.
National Oceanic and Atmospheric Administration (NOAA) Alaska Fisheries Science Center (AFSC) Resource Ecology and Fisheries Management Division (REFM)
mailing and physical
7600 Sand Point Way, N.E. bldg. 4
Seattle
WA
98115
USA
not available
angie.greig@noaa.gov
The user is responsible for the results of any application of this data for other than its intended purpose.
NOAA denies liability if the data are misused.
Downloadable Data
0.295
0.295
20091028
National Oceanic and Atmospheric Administration (NOAA) Alaska Fisheries Science Center (AFSC) Resource Ecology and Fisheries Management Division (REFM)
REQUIRED: The person responsible for the metadata information.
mailing and physical
7600 Sand Point Way, N.E. bldg. 4
Seattle
WA
98115
USA
not available
AFSC.metadata@noaa.gov
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
en
local time
20250328
09574600
FALSE
20250328
09191900
20250328
09191900
NBS_gridv2022
002
0.000
Geographic
GCS_North_American_1983
Angular Unit: Degree (0.017453)
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1.0
ISO 19139 Metadata Implementation Specification
Esri ArcGIS 12.9.0.32739
NBS_gridv2022
-2090485.377428
-180483.776558
2021844.875
422022.377159
1
-180
180
68.104622
49.536373
1
ISO 19115 Geographic Information - Metadata
DIS_ESRI1.0
dataset
002
withheld
Local Area Network
0.295
File Geodatabase Feature Class
File Geodatabase Feature Class
0.000
NAD_1983_Alaska_Albers
EPSG
6.5(3.0.1)
0
20250328