MAP LAYERS |
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LAYER NAME: |
KECONTOURS_LINE and KECONTOURS_POLY |
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AUTHOR/CREATOR: |
DCW |
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ORGANIZATION: |
DCW |
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LINK URL: |
http://www.princeton.edu/~geolib/gis |
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CREATION DATE: |
1993 |
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MODIFIED BY: |
DATA AND INFORMATION MANAGEMENT UNIT UNDP_SOMALIA |
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MODIFICATION DATES: |
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ABSTRACT: |
Hypsography polygon
features are composed of hypsography lines. Because of inconsistencies on source
maps, no attempt was made to reconcile the data with that in other coverages (e.g., coastlines or drainage area features). This coverage contains the contours at a 1:1000000 scale. Elevation contours in meters were calculated and range from 0 meters to 5181.6 meters incrementing by 304.8 meters. |
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CONSTRAINTS: |
Acknowledgment of DCW, UNDP and ESRI would be appreciated in products derived from these data. The data should not be used for navigation or for
producing maps requiring high geodetic accuracy. |
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DATASET SIZE : |
1,875KB |
STATUS |
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BOUNDING
COORDINATES |
EAST: 43.9431 NORTH: 8.8044 |
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WEST: 31.9862 SOUTH -5.9274
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POSITIONAL
ACCURACY: |
The absolute
horizontal accuracy of the DCW for all features derived from Operational
Navigation Charts (ONC) is 2040 meters (6700 feet) rounded to the nearest 5
meters at 90% Circular Error (CE), World Geodetic System (WGS84).
The
absolute horizontal accuracy of the DCW for all features derived from Jet
Navigation Charts (JNC)
is 4270 meters (14006 feet) at 90% Circular Error.
The absolute vertical accuracy of the DCW is the same as for the original ONC and JNC lithographs at 90% Linear Error (LE), Mean Sea Level (MSL).. |
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COORDINATE SYSTEM: |
DECIMAL DEGREES |
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DATUM: |
WGS 84 |
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MAP PROJECTION: |
GEOGRAPHICAL |
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FORMAT |
ARCVIEW 3.1, SHAPEFILE. |
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TABLES |
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SOURCE: |
DCW |
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SOURCE PUBLICATION
DATE: |
1996 |
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CONSTRAINTS: |
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DATASET SIZE: |
299KB |
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ATTRIBUTE
RELIABILITY: |
UNKNOWN |
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STATUS: |
COMPLETE |
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FIELDS: |
SEE ATTACHED FORM |
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CONTACT NAME: |
Alex Lugadiru |
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ORGANIZATION: |
DEPHA PROJECT |
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POSTAL ADDRESS: |
c/o UNDP DDC P.O. |
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EMAIL ADDRESS: |
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TELEPHONE NO.: |
254-020-7624186/95 |
GEOGRAPHIC INFORMATION SYSTEMS (GIS) SPATIAL
OUTPUT FORMAT
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Field Name |
Field Description |
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AREA |
Area of the polygon/region in square coverage units. Computed. Positive real numbers. Source: ARCINFO |
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PERIMETER |
Perimeter of poly/region in coverage units. Computed. Positive real numbers. Source: ARCINFO |
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HYNETL |
Internal feature number.
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HYNETL_ID |
User- assigned feature number User-defined. Integer. Source: ARCINFO |
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HYLNVAL |
Hypsography line value. The item HYLNVAL contains the elevation value of the contour line expressed as feet above mean sea level. When contour lines for different elevations become coincident, as in areas of steep local relief, only a single carrying contour is shown and is coded for the value for the highest elevation present. Valid contour line codes range from –1,000 feet to 29,000 feet incrementing by 1,000 feet. Boundaries associated with no data areas are assigned a value of 9999. |
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METERS |
Elevation in meters. Interval = 304.8m(1000ft.) |
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HYLNTYPE |
Line type. Code Definition 1 = Closed contour. 2 = Depression
contour. 3 = Closed contour,
approximate. 4 = Carrying contour,
coalescence of two or more contour lines with different elevation values. 5 = Depression
contour, approximate. 8 = Connector (an
arbitrary connector of the contour network, used to define no data or
irreconcilable source data areas. These connections were made to establish
elevation zones as polygons. 9 = 5-degree by
5-degree tile boundary. 88 = Used in situations during the edgematching process in which a polygon is contained on one ONC mapping module due to compilation differences and the automation module boundary is needed for closure |