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Ghana Elevation, 2007

Identification Information
Citation
Originator
International Steering Committee for Global Mapping (ISCGM)
Publication Date
2007
Title
Ghana Elevation, 2007
Geospatial Data Presentation Form
raster digital data
Publication Information
Publication Place
Tsukuba-shi
Publisher
International Steering Committee for Global Mapping (ISCGM)
Online Linkage
http://www.columbia.edu/acis/eds/gis/images/iscgm_ghana_2007_elev_rast.zip
Abstract
Ghana Elevation is a Digital Elevation Model representing elevations throughout Ghana at a resolution of 30 arc seconds. This layer is a component of the Global Map a 1:1,000,000 scale framework dataset of the world. It consists of vector and raster layers of transport, administrative boundaries, drainage, elevation, vegetation, land use and land cover data. The data were prepared from information provided by national mapping and other organisations worldwide.
Purpose
The concept of Global Mapping, and the establishment of an international body for Global Mapping, was first proposed by the Ministry of Construction of Japan (MOC) in 1992; and in 1994 the Geographical Survey Institute of Japan (GSI) proposed the first draft Map Specifications. The project currently involves the participation of many interested nations. The main objective of this global project is to bring all nations and concerned organisations together to develop and provide easy and open access to global digital geographic information at a scale of 1:1 million. This would be used to facilitate the implementation of global agreements and conventions for environmental protection, for monitoring of major environmental phenomena and to encourage economic growth within the context of sustainable development. As part of this objective, a Global Map product will be developed to this specification. The Global Map will also contribute to the development of a Global Spatial Data Infrastructure.
Temporal Extent
Currentness Reference
publication date
Time Instant
2007
Bounding Box
West
-5
East
5
North
15
South
0
Theme Keyword
elevation
Theme Keyword Thesaurus
ISO 19115 Topic Categories
Theme Keyword
DEM
Theme Keyword Thesaurus
None
Place Keyword
Ghana
Place Keyword Thesaurus
Library of Congress Subject Headings
Temporal Keyword
2007
Temporal Keyword Thesaurus
None
Access Restrictions
None
Use Restrictions
None
Status
Complete
Maintenance and Update Frequency
Unknown
Point of Contact
Contact Organization
International Steering Committee for Global Mapping (ISCGM)
Delivery Point
Geographical Survey Institute, Kitasato 1
City
Tsukuba
State
Ibaraki
Postal Code
305-0811
Country
JAPAN
Contact Telephone
+81-29-864-6910
Contact Electronic Mail Address
sec@iscgm.org
Native Data Set Environment
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.2.5.1450
Data Quality Information
Logical Consistency Report
Logical consistency is a measure of the degree to which data complies with the technical specification. Logical consistency was validated by tests to check that table and file names are set out as in the Data Dictionary. Graphical tests checking such things as intersections, polygon closure, minimum sizes of polygons and length of linear features were also carried out.
Completeness Report
Completeness is a measure of the degree to which all features listed in the technical specification have been captured, in accordance with the selection criteria, definitions and other rules specified. All instances of a feature and its attribute values that meet the selection criteria and appear on the source materials are captured. The data is generalized so the selection of features is to some extent subjective.
Horizontal Positional Accuracy Report
For horizontal accuracy, 90% of points will be within 2km of their actual location. In the case of data obtained from satellite images, the maximum error is less than or equal to 0.5km.
Lineage
Spatial Data Organization Information
Direct Spatial Reference Method
Raster
Raster Object Information
Raster Object Type
Grid Cell
Row Count
1800
Column Count
1200
Vertical Count
1
Spatial Reference Information
Horizontal Coordinate System Definition
Geographic
Latitude Resolution
0.000000
Longitude Resolution
0.000000
Geographic Coordinate Units
Decimal degrees
Geodetic Model
Horizontal Datum Name
D_WGS_1984
Ellipsoid Name
WGS_1984
Semi-major Axis
6378137.000000
Denominator of Flattening Ratio
298.257224
Vertical Coordinate System Definition
Altitude System Definition
Altitude Resolution
0.000100
Altitude Encoding Method
Explicit elevation coordinate included with horizontal coordinates
Entity and Attribute Information
Entity Type
Entity Type Label
elevation.vat
Entity Type Definition
Elevation
Attributes
Rowid
Internal feature number. (Sequential unique whole numbers that are automatically generated.)
Definition Source
ESRI
VALUE
Elevation in meters
COUNT
Distribution Information
Distributor
International Steering Committee for Global Mapping (ISCGM)
Name
Metadata Reference Information
Metadata Date
20080801
Metadata Contact
Contact Information
Contact Organization Primary
Contact Organization
Research Data Services (RDS), Columbia University Libraries
Contact Person
GIS/Metadata Librarian
Contact Address
Address
420 W. 118th St., 215 IAB, MC 3301
City
New York
State or Province
NY
Postal Code
10027
Contact Voice Telephone
(212)854-6012
Contact Electronic Mail Address
data@library.columbia.edu
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
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