USGS Geoscience Data Catalog
Additional USGS Geoscience data can be found by geographic location or by publication series.
COVER (directory) Contains original UNIX ARC/INFO (ver. 7.0.4) coverages in Robinson projection. The ARC/INFO coverages are supplemented by several files (total 30) in ARC/INFO INTERCHANGE format (where it was available). These files allow user to produce complete Map Composition of data at a scale 1:12,500,000 by using ARCPLOT subsystem. COVER/geo2_7 (coverage) Surficial geology. Item "glg" in Feature Attribute Table. COVER/prov2_7 (coverage) Geological Provinces that outline areas with common geological structures and petroleum systems. There are two additional items in the FAT, "code" - Geologic Province code and "name" - Geologic Province name. COVER/fld2_7 (coverage) Centerpoints of Oil and Gas fields. COVER/pol2_7 (coverage) Country boundaries. COVER/llf2_7 (coverage) Latitude/Longitude grid with cell size 4 * 6 degree. COVER/reg_2_7 (coverage) Boundary between region 2 (Middle East/North Africa and 7 (Sub Saharan Africa). These regions are two of the eight regional subdivisions in the USGS Oil and Gas assessment of the World. COVER/anno2_7 (coverage) Annotations for ocean names. COVER/shore2_7 (coverage) Shoreline for Africa and surrounding areas EXPRT_UX (directory) This directory contains several subsets of the data in export and ungenerate formats for use on UNIX systems: ( 1) ARC/INFO EXPORT data set (Robinson projection) consisting of eight files in ARC/INFO INTERCHANGE format (*.e00 files without compression). File names are correspondent to the original coverages names (see directory COVER). (2) ARC/INFO UNGENERATE files (ASCII comma delimeted) for four major coverages (*.gen extention). File names correspond to the original coverage names. (3) Attribute files (*.csv extention). Contains ASCII, comma delimeted files for the five feature attribute tables of the ARC/INFO coverages. EXPRT_PC (directory) same contents as EXPRT_UX but for PC's not running UNIX. PLOT (directory) Files to facilitate plotting and printing the map. PLOT/afr_map (directory) Complete map composition for use in ARC/INFO ARCPLOT, a collection of *.gra files. PLOT/prov2_7 (directory) Complete map composition without geology for use in ARC/ INFO ARCPLOT, a collection of *.gra files. PLOT/afr.hp2 (file) Plot file for all the data in HPGL2 format. PLOT/provs.hp2 (file) Plot file for data without geology in HPGL2 format. TEXT_UX (directory) TEXT_UX/plot_aml (text file) AML file to produce complete Map Composition at a scale 1:12,500,000 and to plot map composition automatically on HP650C plotter. To use this file the user must set actual full path name to the data or copy all the files to single directory (by Feliks Persits). TEXT_UX/usgs_lab (text file) USGS headline text TEXT_UX/source (text file) List of all the sources of the data TEXT_UX/authors (text file) Who participated in Data Set creation. TEXT_UX/pol_txt (text file) Text indicating political boundaries are for reference and are not definitive in any manner. TEXT_UX/geo_rob (text file) Command file for PROJECT (Geographic to Robinson). TEXT_UX/tr_rob (text file) Command file for PROJECT (Transverse Mercator to Robinson). TEXT_UX/index (text file) Text for small index map showing Provinces and boundary between regions 2 and 7. TEXT_UX/prov_key (text file) Key-legend file for Province outlines TEXT_UX/pol_key (text file) Key-legend file for International boundaries TEXT_UX/map_key (text file) Base key file for map legend TEXT_UX/oil_key (text file) Key-legend file for Oil/Gas fields centerpoints TEXT_UX/afr_shd (text file) Shadeset file TEXT_UX/mapbar (text file) AML for drawing scale and scalebar (by B. Beeman) TEXT_UX/afr_aml (text file) AML for ARCEDIT TEXT_UX/pr_draw (text file) AML for Map Composition without geology. TEXT_UX/afr_menu (text file) Menu file for geological attributing. TEXT_UX/lut_txt (text file) Text file for look-up table that keeps symbols for every "glg" value. TEXT_UX/afr_lut (text file) INFO Look-up table for POLYGONSHADE of "glg" item. TEXT_UX/block_r (text file) Text for Projection description TEXT_UX/fnt034 (text file) Pattern for afr_shd shadeset TEXT_UX/of_name (text file) Open File report Number TEXT_UX/ds_claim (text file) Text for disclaimer TEXT_MAC (directory) same contents as TEXT_UX but with CR only at the end of each line TEXT_PC (directory) same contents as TEXT_UX but with CR LF at the end of each line VIEWS (directory) Data in formats compatible with ARCVIEW 3.0 VIEWS/afr_all.apr (directory) Project file for use with ARCVIEW 3.0 VIEWS/geo2_7.shp, .shx, .dbf (shapefile) Surficial geology in shapefile format VIEWS/fld2_7.shp, .shx, .dbf (shapefile) Oil and gas field centerpoints in shapefile format VIEWS/prov2_7.shp, .shx, .dbf (shapefile) Geologic provinces in shapefile format VIEWS/llf2_7.shp, .shx, .dbf (shapefile) Graticule of latitude and longitude lines 4 x 6 degrees in shapefile format VIEWS/pol2_7.shp, .shx, .dbf (shapefile) Country boundaries in shapefile format VIEWS/afr_geol.avl (ARCVIEW legend file) index names for geologic age VIEWS/afr_age.avl (ARCVIEW legend file) geologic names without index adob_aml (AML file) Commands used to produce complete Map Composition at a scale 1:12,500,000 by using ARCPLOT subsystem and to plot Map Composition automatically on HP650C plotter
Persits, Feliks, Tuttle, Michele, Charpentier, Ronald, Brownfield, Michael, and Takahashi, Kenneth, 1997, Maps showing geology, oil and gas fields and geological provinces of Africa: U.S. Geological Survey Open-File Report 97-470A, U.S. Geological Survey, Denver, Colorado.This is part of the following larger work.
U.S. Geological Survey, 1998, World energy data on CD-ROM: U.S. Geological Survey Open-File Report 97-470.Online Links:
This is a Vector data set. It contains the following vector data types (SDTS terminology):
The map projection used is Robinson.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 1
Ordinates (y-coordinates) are specified to the nearest 1
Planar coordinates are specified in meters
The ellipsoid used is Sphere.
The semi-major axis of the ellipsoid used is 6370997.
The flattening of the ellipsoid used is 1/1.0.
| Value | Definition |
|---|---|
| Q | Quaternary |
| Qe | |
| Qp | |
| QT | Quaternary or Tertiary |
| T | Tertiary |
| Mz | Mesozoic |
| TK | Triassic - Cretaceous |
| K | Cretaceous |
| Kl | |
| KJ | Cretaceous - Jurassic |
| J | Jurassic |
| Jl | |
| JTr | Jurassic - Triassic |
| Tr | Triassic |
| Trl | |
| Pz | Paleozoic |
| MzPz | Mesozoic - Paleozoic |
| P | Permian |
| TrP | Triassic - Permian |
| KC | |
| PC | |
| JC | |
| C | Carboniferous |
| CD | Carboniferous - Devonian |
| Du | |
| D | Devonian |
| DS | Devonian - Silurian |
| S | Silurian |
| SO | Silurian - Ordovician |
| O | Ordovician |
| OCm | Ordovician - Cambrian |
| Cm | Cambrian |
| pC | Precambrian |
| PzpC | |
| Qv | |
| Ti | |
| Mi | |
| MiPi | |
| Pi | |
| Kimb | Kimberlite |
| Salt Dome | |
| Unmapped area | |
| Open water | |
| Sea |
| Range of values | |
|---|---|
| Minimum: | 7000 |
| Maximum: | 7999 |
| Range of values | |
|---|---|
| Minimum: | -17.4 |
| Maximum: | 63.36 |
| Units: | Decimal Degrees |
| Resolution: | 0.001 |
| Range of values | |
|---|---|
| Minimum: | -37.1 |
| Maximum: | 38.3 |
| Units: | Decimal Degrees |
| Resolution: | 0.001 |
Digital Map Compilation - Feliks Persits
Geological Attribution - Feliks Persits, Thomas Ahlbrandt, Michelle Tuttle, Ronald Charpentier, Michael Brownfield
Province Boundaries: Region 2 - Thomas Ahlbrandt, Region 7 - Michelle Tuttle
Province Boundaries Digital Compilation - Lee Osmonson
Oil and Gas Database - Tim Klett
303-236-5776 (voice)
303-236-8822 (FAX)
ahlbrandt@usgs.gov
The data provide government, geological community, consultants, and public with information on important geological basis used to define provinces and oil and gas fields for USGS oil and gas assessement of the world.
UNESCO, CGMW and , 1990, International Geologic Map of Africa: CGMW and UNESCO, Paris,France.
USGS, Central Region, unpublished material, Binary and gray-scale images.
USGS, Central Region, World Energy Resource T, Unpublished material, Mylar:, unpublished material.
Petroconsultants International Data Corp., 1996, PetroWorld Database: Petroconsultants International Data Corp., Geneva, Switzerland.
ESRI, ArcWorld 1:3 million geographical data set.: ESRI, Redlands, CA, USA.
Person who carried out this activity:
303-236-4608 (voice)
fpersits@usgs.gov
Data sources produced in this process:
Data sources used in this process:
Commission for the Geological M, UNESCO, 1990, International Geological Map of Africa: CGMW and UNESCO with the financial support of BRGM, Paris, France.
Overall accuracy based on accuracy of general geology coverage. The scanned images of each of five sheets of original paper map (from UNESCO base geologic map) were transformed to Transverse Mercator projection with RMS error not more than 2500 m (0.5 mm in original paper map). No rubber transformation applied. Gray-scale images were used as a background in ARCEDIT digitizing. Maximum shift a line in a coverage from centerline of its copy on image did not exceed 1500-1700 m. Final plot of 1:5,000,000 scale was superimposed on a top of original map, maximum error did not exceed 3500 m.
1. Original geological maps are of 500 m. maximum accuracy (0.1 mm on paper map of 1:5,000,000 scale) 2. Scanned images were of 200 dot/inch resolution (0.12 mm on paper). That is why fuzzy tolerance for CLEAN program in ARC/INFO was set to 500 m. Average positional accuracy can be evaluated as 1000 m (twice of fuzzy tolerance).
The generalizations of original geological map (UNESCO) were
carried out:
1. Several geological age subdivisions on original (UNESCO)
1:5,000,000 geological map were combined into single units.
For example, all Cretaceous combined into one unit.
2. All the Precambrian subdivisions were combined into one
unit.
This version of Geologic Province Boundaries are correct as of July, 1997.
Since Data set is collection of ARC/INFO coverages topological consistency are supported. Fuzzy tolerance has been maintained the same through all processing steps. Based on fuzzy tolerance value all undershoots and overshoots were detected and deleted. A comparison between color plot and original paper map was carried out by visual comparison. Color plots in 1:5,000,000 scale were superimposed on every of correspondent original map sheets. All detected errors in attributes were corrected.
Are there legal restrictions on access or use of the data?
- Access_Constraints: None
- Use_Constraints: None
1-888-ASK-USGS (voice)
303-202-4693 (FAX)
infoservices@usgs.gov
USGS Open-File Report 97-470A
Although these data have been processed on computer system at the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the Geological Survey regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty.
| Data format: | Coverages in format ARCE and ungenerate (version 7.0.4) |
|---|---|
| Media you can order: |
CD-ROM
(format ISO 9660)
|
| Data format: | shapefiles in format ARCVIEW Shapefiles (version 1.0) |
|---|---|
| Media you can order: |
CD-ROM
(format ISO 9660)
|
To use coverage data you need to have ARC/INFO ver. 7.0.4 or higher installed. To use ARCVIEW data you need to have ARCVIEW 3.0 installed. If you dont't have ARC/INFO other similar data set is available in Adobe Systems, Inc., Portable Document Format(TM) (PDF). (You must download and install the Adobe(R) Reader, available at no charge from Adobe Systems, to view and print this version.)
303-236-4608 (voice)
fpersits@usgs.gov
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://geo-nsdi.er.usgs.gov/metadata/open-file/97-470/a/metadata.faq.html
Page Contact Information: Peter Schweitzer
Page Last Modified: Monday, 10-Nov-2008 12:19:52 EST
