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DCW Political Boundaries and Oceans, Lines

Identification Information
Citation
Originator
National Imagery and Mapping Agency (now National Geospatial-Intelligence Agency)
Publication Date
19920701
Title
DCW Political Boundaries and Oceans, Lines
Geospatial Data Presentation Form
vector digital data
Publication Information
Publication Place
Fairfax, VA
Publisher
National Imagery and Mapping Agency
Online Linkage
https://hgl.harvard.edu/catalog/harvard-dcw-po-line
Abstract
This datalayer is a polyline coverage representing political boundaries and ocean feature lines found throughout DCW (Digital Chart of the World) geographic coverage as of 1992. Ocean features shown here include areas of pack ice, shelf ice and open ocean. The Political/Oceans layers provide a common visual definition of countries rather than a legal one. The legal definition of a coastal country would include offshore ocean areas, while with a graphic depiction, the country ends at the ocean shoreline. Please note that the ocean shoreline is included in the Political/Oceans line coverage only and is not repeated in the Drainage or Hypsography layers. This type of feature organization enables selection of countries as areas and the distinction of the land and water areas of the world. This layer was derived from the VMAP0 series produced by the National Geospatial-Intelligence Agency (NGA), formerly known as NIMA (National Imagery and Mapping Agency), an agency of the United States government. VMAP data set products use the "vector product format" (vpf). The term "VMap" is derived from "Vector Smart Map." Digital Chart of the World is a comprehensive 1:1,000,000 scale vector basemap of the world. It consists of cartographic, attribute, and textual data. The primary source for the database is the National Imagery and Mapping Agency's (NIMA) Operational Navigation Chart (ONC) series. This is the largest scale unclassified map series in existence that provides consistent, continuous global coverage of essential basemap features. The coverage is organized into 10 thematic layers which feature a vast number of files organized into libraries. These libraries, or coverages, are geographicially bounded areas, rather than feature-linked coverages. DCW Layers in the Harvard Geospatial Library are feature-based as we have processed the multiple tiles from the VMAP0 libraries into a series of seamless coverages (e.g. aeronautical features appear in a single layer, "Aeronautical Facilities, Points") which depict a particular feature as it occurs throughout the available geographic coverage areas. Since different geographic areas were mapped by NIMA at different times using various types of feature capture and scanning and digitizing methods and software, multiple map sources of varying dates and multiple processing approaches are represented in each of these HGL layers. We have necessarily generalized the discussion of data source material and process steps in the Data Quality section of this metadata document.
Purpose
The Digital Chart of the World is a general purpose global database designed to support Geographic Information Systems applications. This layer is intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production. This layer will provide a basemap for layers related to socio-economic and political anaylsis, statistical enumeration and analysis, or to support graphical overlays and analysis with other spatial data. More advanced user applications may focus on demographics, urban and rural land use planning and related areas including defining boundaries, managing assets and facilities, integrating attribute databases with geographic features, spatial analysis, and presentation output.
Supplemental Information
Entities (features) and Attributes for DCW are fully described in: Department of Defense, 1992, Military Specification Digital Chart of the World (MIL-D-89009): Philadelphia, Department of Defense, Defense Printing Service Detachment Office. The DCW used a product-specific attribute coding system that is composed of TYPE and STATUS designators for area, line, and point features; and LEVEL and SYMBOL designators for text features. The TYPE attribute specifies what the feature is, while the STATUS attribute specifies the current condition of the feature. Some features require both a TYPE and STATUS code to uniquely identify their characteristics. In order to uniquely identify each geographic attribute in the DCW, the TYPE and STATUS attribute code names are preceded by the two letter coverage abbreviation and a two letter abbreviation for the type of graphic primitive present. The DCW Type/Status codes were mapped into the Feature Attribute Coding Catalogue (FACC) coding scheme. A full description of FACC may be found in The DIgital Geographic Information Exchange STandard (DIGEST) Edition 1.2, January 1994. Please consult the DIGEST FACC website for complete coding data. (http://www.digest.org/html/DIGEST_2-1_Part4_AnnexB.pdf)
Temporal Extent
Currentness Reference
publication date
Time Instant
19920701
Bounding Box
West
-179.999989
East
179.999989
North
89.000000
South
-89.000000
Theme Keyword
Oceans
Sea ice
Icebergs
Boundaries
Territory, National
Coasts
Theme Keyword Thesaurus
LCSH
ISO Topic Category
boundaries
Place Keyword
Northern Hemisphere
Southern Hemisphere
Eastern Hemisphere
Western Hemisphere
Africa
Asia
Australia
Europe
North America
South America
Polar regions
Earth
Place Keyword Thesaurus
LCSH
Temporal Keyword
Access Restrictions
None
Use Restrictions
For educational, non-commercial use only. Although this data set has been developed by the NGA no warranty expressed or implied is made by them as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the NGA in the use of this data, or related materials.
Status
Complete
Maintenance and Update Frequency
None planned
Point of Contact
Contact Organization
National Geospatial-Intelligence Agency
Delivery Point
Office of Corporate Relations
Delivery Point
Public Affairs Division, MS D-54
Delivery Point
4600 Sangamore Road
City
Bethesda
State
MD
Postal Code
20816-5003
Country
USA
Contact Telephone
800-455-0899
Hours of Service
Monday through Friday 9:00 A.M. to 4:00 P.M. EST-USA
Credit
National Imagery and Mapping Agency (now known as National Geospatial-Intelligence Agency).
Native Data Set Environment
Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4; ESRI ArcCatalog 9.0.0.535
Data Quality Information
Attribute Accuracy Report
100 percent of attribute codes were reviewed against the source manuscripts. No formal effort was undertaken to develop a quantitative attribute accuracy statement.
Logical Consistency Report
All data were found to be topologically correct. No duplicate features are present. All areas are completely described as depicted on the source manuscripts. No undershoots or overshoots are present. All data were consistently captured using the rules described in the narrative associated with the Data Quality Table and in the various feature table narrative files present at the coverage level within the library. Special automation techniques Points were derived from Defense Mapping Agency (DMA) DAFIF files, with the exception of airport locations within the borders of the former Warsaw Pact nations and other communist countries, including the People's Republic of China, North Korea, Vietnam, and Albania. In the former case, DAFIF point locations were loaded into ARC/INFO, reformatted into a compatible file structure, and converted into ARC/INFO coverages using the ARC GENERATE command. Applicable attributes were initially maintained in a related file, and later joined to the feature attribute table. In the latter case, the information was derived from paper lithographic sources. Data captured from lithographs were recompiled onto a stable Mylar base, using local registration techniques over 1-degree areas. In this approach, 1-degree graticules were used to establish a network of local control, minimizing the effects of the unstable paper media to areas of this size. In extreme northern and southern latitudes (above approximately 70 degrees north or south), a local registration interval of 2 degrees was used. Following recompilation, the locations were manually digitized. Feature coincidence AE point locations do not have explicit coincidence with other features in the database. Database design issues Data derived from lithographic sources have an attribute of AEPTTYPE = 5. DAFIF-derived data have more available attributes than those derived from lithographic sources, which contain null values in the AEPTICAO and AEPTDKEY attribute fields.
Completeness Report
100 percent of features depicted on the ONC source materials have been captured. 100 percent of the features have valid attribute codes assigned to them. Airport features were derived from the DMA Digital Aeronautical Flight Information File (DAFIF). Where DAFIF was incomplete, locations were added from the ONC.
Horizontal Positional Accuracy Report
The Horizontal Positional Accuracy Value represents overall accuracy. Source chart-specific accuracies are available as area feature attributes in the VMap-0 data quality coverage. The primary accuracy analysis was performed on one chart only in the prototyping phase of the DCW project. Horizontal Positional Accuracy is expressed in meters. Detailed horizontal accuracy figures were developed by comparing the positions of well-defined points in the roads, railroads, utility lines, and drainage coverages against sources of higher accuracy, measuring the offsets, and expressing differences as a Circular Map Accuracy figure at a 90% confidence interval. This figure was independently verified by adding known production errors to source chart accuracies in a root sum square calculation.
Quantitative Horizontal Positional Accuracy Assessment
Lineage
Source
Originator
National Imagery and Mapping Agency
Publication Date
1974-1992
Title
Operational Navigational Chart (ONC)
Geospatial Data Presentation Form
map
Publication Information
Source Scale Denominator
1000000
Type of Source Media
stable-base material
Source Temporal Extent
Time Period Information
Range of Dates/Times
Beginning Date
1974
Ending Date
1992
Source Currentness Reference
ground condition
Contribution
All information found on the source with the exception of aeronautical data. The U.S. Defense Mapping Agency Operational Navigation Chart (ONC) series and the Jet Navigation Charts (JNCs) for the region of Antarctica were the primary sources for the Digital Chart of the World database. The ONCs have a scale of 1:1,000,000, and they are the largest scale, unclassified map series produced by the DMA that provides consistent, continuous global coverage of essential basemap features. Some collateral sources have been used to enhance road and railroad connectivity through selected urbanized areas. The DMA's Digital Aeronautical Flight Information File (DAFIF) was the primary source for the airport data in the aeronautical layer. An Advanced Very High Resolution Radiometer (AVHRR) image for the coterminous United States is the source for the data in the Vegetation layer. The Defense Intelligence Agency Manual (DIAM) 65-18 is the source for the Geopolitical codes and the ocean boundaries information contained in the Political and Oceans layer. The product specifications for the ONCs and JNCs have been used extensively in the design of the database.
Source
Originator
Defense Mapping Agency
Publication Date
1990
Title
Jet Navigational Chart
Geospatial Data Presentation Form
map
Publication Information
Source Scale Denominator
2000000
Type of Source Media
stable-base material
Source Temporal Extent
Time Period Information
Range of Dates/Times
Beginning Date
1974
Ending Date
1991
Source Currentness Reference
publication date
Contribution
All information found on the source with the exception of aeronautical data. JNCs were used as source for the Antarctica region only.
Spatial Data Organization Information
Direct Spatial Reference Method
Vector
Point and Vector Object Information
SDTS Terms Description
SDTS Point and Vector Object Type
String
Point and Vector Object Count
107328
Spatial Reference Information
Horizontal Coordinate System Definition
Planar
Map Projection
Map Projection Name
WGS 1984 Web Mercator Auxiliary Sphere
Planar Coordinate Information
Planar Coordinate Encoding Method
coordinate pair
Coordinate Representation
Abscissa Resolution
0.000000006714873101998366
Ordinate Resolution
0.000000006714873101998366
Planar Distance Units
meter
Geodetic Model
Horizontal Datum Name
D WGS 1984
Ellipsoid Name
WGS 1984
Semi-major Axis
6378137.0
Denominator of Flattening Ratio
298.257223563
Entity and Attribute Information
Entity Type
Entity Type Label
DCW Political and Ocean Polygon Features
Entity Type Definition
Polygons represent various political and ocean areas
Entity Type Definition Source
HGL
Attributes
TILE_ID
VPF Format Tile Identifier Code (2 to 768)
Definition Source
NIMA
SHAPE
Feature geometry. (Coordinates defining the features.)
Definition Source
ESRI
SHAPE.LEN
Polyline length measured in map units (Positive real numbers that are automatically generated.)
Definition Source
Computed
SHAPE.FID
Internal feature number. (Sequential unique whole numbers that are automatically generated.)
Definition Source
ESRI
POLNSTAT
Political ocean line status code
1
Definite (boundary or coastline)
2
Approximate (boundary) or fluctuating (coastline)
3
Indefinite (boundary) or unsurveyed (coastline)
4
Man-made (coastline) (dike)
5
Indeterminable (coastline)
6
Ice cliff (when coincident with coasline or ice line)
7
Political boundary (that is, based on single-line river or stream location)
8
Connector (international or administrative boundary extensions through inland water areas)
9
5-degree by 5-degree tile boundary
Definition Source
DCW Data Dictionary
POLNTYPEDE
Political line type description
Administrative boundary, major
None
Administrative boundary, primary
None
Coastal closure line
None
Coastline
None
Connector
None
Ice line
None
Ice/Water line
None
International Date Line
None
International boundary, Defacto
None
International boundary, Dejure
None
Ocean demarcation line
None
Seawall
None
Treaty or occupancy line
None
Definition Source
DCW Data Dictionary (1993)
ID
Feature identifier (1 to 44328)
Definition Source
None
POLNTYPE
Political/Oceans Line Type
1
International boundary, de jure
2
Interior boundary, de facto
4
Subnational administrative boundary, first order
5
Subnational administrative boundary, second order
6
Treaty or occupancy line (demilitarized zone)
7
Coastal closure line (used to connect ocean shoreline across river mouths, glaciers, lagoons, fjords, and so forth.
8
Ocean demarcation line (used to separate ocean aggregations)
9
Ice line (used to separate types os sea ice)
10
Coastline
11
Ocean/sea ice boundary
12
Seawall
13
International data line
88
Arbitrary connector (if needed)
-2147483647
None (used for tile border) value=99 in DCW
Definition Source
DCW Data Dictionary
POLNSTATDE
Political ocean line status description
Approximate boundary or fluctuating coastline
None
Definite
None
Icecliff (coastline or ice line)
None
Indefinite boundary or unsurveyed coastline
None
Manmade coastline
None
None
None
Poly closure line
None
River, when boundary
None
Undetermined coastline
None
Definition Source
DCW Data Dictionary
EDG_ID
Feature Identifier (1 to 1180)
Definition Source
None
Distribution Information
Format Name
Shapefile
Distributor
Harvard Geospatial Library
Online Access
http://hgl.harvard.edu/
Name
Metadata Reference Information
Metadata Date
20060321
Metadata Contact
Contact Information
Contact Organization Primary
Contact Organization
Harvard Geospatial Library
Contact Position
Geospatial Resources Cataloger
Contact Address
Address
Harvard University Library
Address
Office For Information Systems
Address
1280 Massachusetts Avenue
City
Cambridge
State or Province
MA
Postal Code
02138
Country
USA
Contact Voice Telephone
617-495-2417
Contact Facsimile Telephone
617-496-0440
Contact Electronic Mail Address
hgl_ref@hulmail.harvard.edu
Hours of Service
Monday - Friday, 9:00 am - 4:00 pm EST-USA
Metadata Standard Name
FGDC Content Standards for Digital Geospatial Metadata
Metadata Standard Version
FGDC-STD-001-1998
Metadata Extensions
Online Linkage
http://www.esri.com/metadata/esriprof80.html
Profile Name
ESRI Metadata Profile
Metadata Extensions
Online Linkage
http://www.esri.com/metadata/esriprof80.html
Profile Name
ESRI Metadata Profile
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