This ArcView GIS layer is intended as a backdrop to the Gulf of Mexico
area map. It contains the U.S. state boundaries in a polyline format. The
coastal states area has been cropped to provide an overview extent for
the Gulf of Mexico region.
Purpose:
This GIS overlay is a component of the U. S. Geological Survey, Woods Hole
Field Center's, Gulf of Mexico ArcView GIS database. The Gulf of Mexico
GIS database is intended to organize and display USGS held data and provide
on-line (WWW) access to the data and/or metadata.
image showing the extent of the U.S coastal states of Gulf of Mexico as
utilized in the ArcView project file
Native_Data_Set_Environment: ESRI Shapefile format; ArcView version
3.0b; data/misc/usa.shp
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report: none
Logical_Consistency_Report:
none No additional checks for topological consistency were performed on
this data set.
Completeness_Report: none
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: U. S. Defense Mapping Agency(comp.)
Publication_Date: Unknown
Publication_Time: Unknown
Title: World Data Bank II coastline
Edition: U. S. Defense Mapping Agency
Source_Scale_Denominator: 2000000
Type_of_Source_Media: magnetic tape
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19981005
Source_Currentness_Reference: Publication Date
Source_Citation_Abbreviation: WDBII
Source_Contribution:
The World Data Bank II political boundary information (state, coastline
and international boundaries) were used to generate a vector dataset for
the United States Gulf of Mexico coastal state boundaries.
Process_Step:
Process_Description:
The World Data Bank II coastline information has been stored in a format
for use with the U.S. Geological Survey's MAPGEN prorgam. The vector latitude/longitude
coordinates were extracted from from the Mapgen file with the area coordinates
of -99.5, 31.1 and -79.5, 22.5. This retrieval was done for the U. S. state
boundaries, coastline and international boundaries creating three ASCII
files. The three individual files were combined to create one ASCII data
file.
The ASCII file generated from the MAPGEN coast files were imported to PCI
Remote Sensing Software's Imageworks program. The vector information was
then checked for digitizing errors using PCI's Imageworks. Errors found
from digitizing overshoots and undershoots in the original digitizing were
corrected. All polygons were checked for closure. The corrected segment
was exported in the ARC export format (usstates.e00) with the nodes recorded
as latitude/longitude coordinates in decimal degrees.
The ARC export file, usstates.e00, was imported to ARC as coverage usstates.
No clean was applied to the dataset as it has been verified clean in the
previous processing steps. The ARC polygon coverage was created and a new
field, state, was added to the attribute table. Polygons were grouped together
and the table field was updated by identifing the state name in the added
field.
The ArcView shapefile, usstates, was brought into ArcView for final viewing
and verification. No further editting or changes were needed. This is the
final file created for this overlay/theme.
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 121
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: .005
Longitude_Resolution: .005
Geographic_Coordinate_Units: Decimal degrees
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1927
Ellipsoid_Name: Clarke 1866
Semi-major_Axis: 6378206.4
Denominator_of_Flattening_Ratio: 294.98
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: usstates.dbf
Entity_Type_Definition: Shapefile Attribute Table
Entity_Type_Definition_Source: None
Attribute:
Attribute_Label: Area
Attribute_Definition: Total computed area of shapefile.
Attribute_Definition_Source: Software computed
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.000
Range_Domain_Maximum: 18.119
Attribute:
Attribute_Label: Perimeter
Attribute_Definition: Total computed perimeter of shapefile
Attribute_Definition_Source: Software computed
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.010
Range_Domain_Maximum: 43.622
Attribute:
Attribute_Label: Usa_
Attribute_Definition:
Carried over from the ArcInfo attribute USA#. USA# is an ArcInfo internal
control parameter and has no applicable relevance to the use of the data.
Attribute_Definition_Source: User Defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2
Range_Domain_Maximum: 122
Attribute:
Attribute_Label: Usa_id
Attribute_Definition:
Carried over from the ArcInfo attribute USA_ID. USA_ID is an ArcInfo internal
control parameter and has no applicable relevance to the use of the data.
Attribute_Definition_Source: User Defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1
Range_Domain_Maximum: 121
Attribute:
Attribute_Label: State
Attribute_Definition:
Character string identifying polygon affiliation with state name.
The field contains one of the following items:
Although this derived data set and it's lineage dataset have been used
by the USGS, no warranty, expressed or implied, is made by the USGS as
to the accuracy of the data and/or related materials. The act of distribution
shall not constitute any such warranty, and no responsibility is assumed
by the USGS in the use of these data or related materials.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ARCV
Format_Information_Content:
usa.dbf usa.shp usa.shx
File_Decompression_Technique: No compression applied
Transfer_Size: 425Kbytes
Digital_Transfer_Option:
Offline_Option:
Offline_Media: CD-ROM
Recording_Capacity:
Recording_Density: 650
Recording_Density_Units: Mbytes
Recording_Format: ISO 9600
Compatibility_Information:
The user must have a system with a CD-ROM capable of reading an ISO-9660
standard CD-ROM disk. To browse the information contained on this disk,
the user must also have a current version of WWW browser available.
Digital_Form:
Digital_Transfer_Information:
Format_Name: ARCV
Format_Information_Content:
The three ArcView shapefiles (usa.dbf, usa.shp, usa.shx) that contain the
U.S. coastal states used in the ArcView project files.
File_Decompression_Technique: zip
Transfer_Size: 155Kbytes
Digital_Transfer_Option:
Offline_Option:
Offline_Media: CD-ROM
Recording_Capacity:
Recording_Density: 650
Recording_Density_Units: Mbytes
Recording_Format: ISO 9600
Compatibility_Information:
The user must have a system with a CD-ROM capable of reading an ISO-9660
standard CD-ROM disk. To browse the information contained on this disk,
the user must also have a current version of WWW browser available. The
user must also have the software installed on their computer system capable
to unzip the archived file.
Fees: none
Technical_Prerequisites:
The US Gulf of Mexico coastal states are available in an ArcView shapefile
format. The user must have ESRI's ArcView 3.0 or greater software to read
and process the data file. In lieu of Arcview, the user may utilize another
GIS application package capable of importing the data.
