MAP LAYERS |
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LAYER NAME: |
KEGEOLOGY |
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AUTHOR/CREATOR: |
United States Geological Survey (USGS) |
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ORGANIZATION: |
United States Geological Survey (USGS) |
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LINK URL: |
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CREATION DATE: |
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MODIFIED BY: |
DATA AND INFORMATION MANAGEMENT UNIT UNDP_SOMALIA |
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MODIFICATION DATES: |
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ABSTRACT: |
The purpose of digitizing the geologic map was to allow us to have a geologic base on which we drew the boundaries of the geologic provinces. The World Energy Assessment created geologic maps of 7 regions. These regions were joined with edge matching or checking for feature description by the Global GIS team. The user is warned there will be discrepancies on bordering features. The regions are described in the Geologic Provinces of the World full metadata files. The geologic maps were digitized so that we could use the geology as a general guide to draw the boundaries of the geologic provinces. |
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CONSTRAINTS: |
Portions of this database covering coastline and country
boundaries contain intellectual property of Environmental Systems Research Institute,
Inc.(ESRI), and are used with their permission. End
users are permitted to use these data sets for their own internal use,
including derivative work, but are prohibited from using and redistributing
these data individually or in a derivative work to third parties. |
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DATASET SIZE: |
544KB |
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: |
It is not possible to calculate a definitive measure of the horizontal positional accuracy of this coverage because it is a composite data set compiled from a variety of sources using a variety of methodologies. Positional accuracy is dependent upon the extent of geologic knowledge available about the area delineated for each assessment unit. This includes the density of oil/gas field center points and well locations in the Petro-consultants Exploration and Production Database (1996). The maximum possible accuracy is twice the fuzzy tolerance of 500 meters, or 1000 meters. |
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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: |
United States Geological Survey (USGS) |
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SOURCE PUBLICATION DATE: |
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CONSTRAINTS: |
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DATASET SIZE: |
24KB |
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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. |
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PERIMETER |
Perimeter of poly/region in coverage units. Computed. |
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AGE |
Specific age of source rock. |
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GLG |
abbreviated geologic age various geologic rock units of the geologic map (If the abbreviated name was unknown it was copied into the description column): Q, T, K, JK, J, TrJ, Tr, PZMZ, P, CP, C, D, S, OS, CmO, Cm, AD, PZ, APZ, Qv, Cv, Mv, Pv, PZv, MCi, PMi, Mm, PZm, pC, H2O, Ice, U Description: Explanation of “Glg” code: Q - Quaternary (undivided) T - Tertiary K - Cretaceous (undivided) JK - Cretaceous and Jurassic J - Jurassic (undivided) TrJ - Jurassic and Triassic Tr - Triassic PZMZ - Paleozoic-Mesozoic P - Permian CP - Permian - Carboniferous C - Carboniferous D - Devonian (undivided) S - Silurian OS - Silurian -
Ordovician CmO -
Ordovician - Cambrian Cm - Cambrian AD -
Precambrian - Devonian PZ - Paleozoic APZ -
Precambrian - Paleozoic Qv - Quaternary
volcanics Cv - Creteceous
- Tertiary volcanics Mv - Mesozoic
volcanics Pv - Permian
volcanics PZv - Paleozoic
volcanics MCi - Mesozoic - Cenozoic intrusives PMi - Paleozoic - Mesozoic intrusives Mm - Mesozoic
metamorphics PZm - Paleozoic
metamorphics pC - Precambrian (undivided) Ice - Arctic areas covered by Ice H2O - Lakes and wide rivers U - Unmappedd area "" - "unlabeled"
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