USGS Geoscience Data Catalog
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Shroba, Ralph R. , Brandt, Theodore R. , and Blossom, Jeffrey C. , 2001, Surficial Geologic map of the Greater Omaha Area, Nebraska and Iowa: U.S. Geological Survey Miscellaneous Field Studies Map MF-2391, United States Geological Survey, Denver, Colorado.Online Links:
This is a Vector data set.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 50
Ordinates (y-coordinates) are specified to the nearest 50
Planar coordinates are specified in Meters
The horizontal datum used is North American Datum of 1927.
The ellipsoid used is Clarke 1866.
The semi-major axis of the ellipsoid used is 6378206.4.
The flattening of the ellipsoid used is 1/294.98.
OMGEO100.PAT: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 AREA 8 18 F 5 9 PERIMETER 8 18 F 5 17 OMGEO100# 4 5 B - 21 OMGEO100-ID 4 5 B - 25 UNIT 4 4 I - 29 SOURCE 4 4 I - 33 LABEL 10 10 C - 43 DESC 100 100 C - 143 SYMBOL 3 3 I - OMGEO100.AAT: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 FNODE# 4 5 B - 5 TNODE# 4 5 B - 9 LPOLY# 4 5 B - 13 RPOLY# 4 5 B - 17 LENGTH 8 18 F 5 25 OMGEO100# 4 5 B - 29 OMGEO100-ID 4 5 B - 33 LINECODE 3 3 I - 36 NAME 30 30 C - 66 SOURCE 4 4 I - OMGEO100.CON: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 LINECODE 3 3 I - 4 SYMBOL 3 3 I - 7 TYPE 10 10 C - 17 MODIFIER 20 20 C - 37 CERTAINTY 15 15 C - 52 DESC 100 100 C - OMGEO100.RU: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 UNIT 4 4 I - 5 LABEL 10 10 C - 15 SYMBOL 3 3 I - 18 NAME 7 7 C - 25 SS 3 3 C - 28 LITH 20 20 C - 48 DESC 250 250 C - 298 MINAGE 7 7 C - 305 MAXAGE 7 7 C - OMGEO100.REF: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 SOURCE 4 4 I - 5 SCALE 8 8 I - 13 AUTHORS 200 200 C - 213 YEAR 4 4 I - 217 REFERENCE 250 250 C -omter100 coverage: Contains geologic polygons for areas of Peoria Loess. These polygons are duplicates of ones found in omgeo100 for this unit and are used for cartographic purposes in overprinting pattern in these areas. The INFO structure of these files is listed below:
OMTER100.PAT: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 AREA 8 18 F 5 9 PERIMETER 8 18 F 5 17 OMTER100# 4 5 B - 21 OMTER100-ID 4 5 B - 25 UNIT 4 4 I - 29 SOURCE 4 4 I - 33 LABEL 10 10 C - 43 DESC 100 100 C - OMTER100.AAT: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 FNODE# 4 5 B - 5 TNODE# 4 5 B - 9 LPOLY# 4 5 B - 13 RPOLY# 4 5 B - 17 LENGTH 8 18 F 5 25 OMTER100# 4 5 B - 29 OMTER100-ID 4 5 B - 33 LINECODE 3 3 I - 36 NAME 30 30 C - 66 SOURCE 4 4 I - OMTER100.CON: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 LINECODE 3 3 I - 4 SYMBOL 3 3 I - 7 TYPE 10 10 C - 17 MODIFIER 20 20 C - 37 CERTAINTY 15 15 C - 52 DESC 100 100 C - OMTER100.REF: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 SOURCE 4 4 I - 5 SCALE 8 8 I - 13 AUTHORS 200 200 C - 213 YEAR 4 4 I - 217 REFERENCE 250 250 C -ompnt100 coverage: Contains geologic points for sites classified as bedrock, Loveland Loess, or Till. The INFO structure of these files is listed below:
OMPNT100.PAT: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 AREA 8 18 F 5 9 PERIMETER 8 18 F 5 17 OMPNT100# 4 5 B - 21 OMPNT100-ID 4 5 B - 25 PTTYPE 32 32 C - 57 SYMBOL 3 3 I - 60 SOURCE 4 4 I - OMPNT100.REF: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 SOURCE 4 4 I - 5 SCALE 8 8 I - 13 AUTHORS 200 200 C - 213 YEAR 4 4 I - 217 REFERENCE 250 250 C -ombdy100 coverage: Contains lines defining state and county boundaries derived from USGS DLG data. The INFO structure of these files is listed below:
OMBDY100.AAT: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 FNODE# 4 5 B - 5 TNODE# 4 5 B - 9 LPOLY# 4 5 B - 13 RPOLY# 4 5 B - 17 LENGTH 8 18 F 5 25 OMBDY100# 4 5 B - 29 OMBDY100-ID 4 5 B - 33 LINECODE 3 3 I - 36 NAME 30 30 C - 66 SOURCE 4 4 I - OMBDY100.CON: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 LINECODE 3 3 I - 4 SYMBOL 3 3 I - 7 TYPE 10 10 C - 17 MODIFIER 20 20 C - 37 CERTAINTY 15 15 C - 52 DESC 100 100 C - OMBDY100.REF: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 SOURCE 4 4 I - 5 SCALE 8 8 I - 13 AUTHORS 200 200 C - 213 YEAR 4 4 I - 217 REFERENCE 250 250 C -omtrn100 coverage: Contains lines defining linear transportation features (highways and roads) derived from USGS DLG data. The INFO structure of these files is listed below:
OMTRN100.AAT: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 FNODE# 4 5 B - 5 TNODE# 4 5 B - 9 LPOLY# 4 5 B - 13 RPOLY# 4 5 B - 17 LENGTH 8 18 F 5 25 OMTRN100# 4 5 B - 29 OMTRN100-ID 4 5 B - 33 ENTITY_LABEL 7 7 C - 40 ROUTE_NUMBER1 7 7 C - OMTRN100.REF: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 SOURCE 4 4 I - 5 SCALE 8 8 I - 13 AUTHORS 200 200 C - 213 YEAR 4 4 I - 217 REFERENCE 250 250 C -omhyp100 coverage: Contains lines defining hypsographic features derived from USGS DLG data. The ELEVATION_M item stores the 20 meter contour elevation data. The ENTITY_ LABEL item stores the DLG major/minor 0200200 code common to all arcs in the dataset, which identifies the type of hypsographic data. The INFO structure of these files is listed below:
OMHYP100.AAT: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 FNODE# 4 5 B - 5 TNODE# 4 5 B - 9 LPOLY# 4 5 B - 13 RPOLY# 4 5 B - 17 LENGTH 8 18 F 5 25 OMHYP100# 4 5 B - 29 OMHYP100-ID 4 5 B - 33 ENTITY_LABEL 7 7 C - 40 ELEVATION_M 8 12 F 3 OMHYP100.REF: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 SOURCE 4 4 I - 5 SCALE 8 8 I - 13 AUTHORS 200 200 C - 213 YEAR 4 4 I - 217 REFERENCE 250 250 C -omhyd100 coverage: Contains polygons and lines defining hydrographic features derived from USGS DLG data. The ENTITY_LABEL item defines major streams/rivers/lakes (polygons) as open water fill areas when coded 0500200. The INFO structure of these files is listed below:
OMHYD100.PAT: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 AREA 8 18 F 5 9 PERIMETER 8 18 F 5 17 OMHYD100# 4 5 B - 21 OMHYD100-ID 4 5 B - 25 ENTITY_LABEL 7 7 C - 32 SOURCE 4 4 I - OMHYD100.AAT: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 FNODE# 4 5 B - 5 TNODE# 4 5 B - 9 LPOLY# 4 5 B - 13 RPOLY# 4 5 B - 17 LENGTH 8 18 F 5 25 OMHYD100# 4 5 B - 29 OMHYD100-ID 4 5 B - 33 SOURCE 4 4 I - OMHYD100.REF: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 SOURCE 4 4 I - 5 SCALE 8 8 I - 13 AUTHORS 200 200 C - 213 YEAR 4 4 I - 217 REFERENCE 250 250 C -ommea100 coverage: Contains lines defining scarps bordering former channels of the Missouri River. Hatchures point downslope. The INFO structure of these files is listed below:
OMMEA100.AAT: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 FNODE# 4 5 B - 5 TNODE# 4 5 B - 9 LPOLY# 4 5 B - 13 RPOLY# 4 5 B - 17 LENGTH 4 12 F 3 21 OMMEA100# 4 5 B - 25 OMMEA100-ID 4 5 B - 29 LINECODE 3 3 I - 32 NAME 30 30 C - 62 SOURCE 4 4 I - OMMEA100.STR: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 LINECODE 3 3 I - 4 SYMBOL 3 3 I - 7 TYPE 10 10 C - 17 HORIZONTAL 20 20 C - 37 VERTICAL 20 20 C - 57 FOLD 15 15 C - 72 PLUNGE 15 15 C - 87 ACCURACY 15 15 C - 102 CERTAINTY 15 15 C - 117 DESC 100 100 C - OMMEA100.REF: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 SOURCE 4 4 I - 5 SCALE 8 8 I - 13 AUTHORS 200 200 C - 213 YEAR 4 4 I - 217 REFERENCE 250 250 C -Auxiliary files:
UNIT | LABEL | DESC 1 | af | Artificial fill deposits 2 | Qal | Flood plain and stream channel alluvium 3 | Qsw | Sheetwash alluvium 4 | Qss | Sheetwash and stream alluvium 5 | Qlp | Peoria Loess 6 | Qll | Loveland Loess 7 | Qti | Till 8 | R | Bedrock 9 | w | Open WaterCoding of ENTITY_LABEL attribute numbers in the omtrn100 coverage is listed below:
Interstates 1700201 1700203 Minor highways 1700204 1700205 Main roads 1700209 Minor streets 1700210 1700211 Main road on/off ramps 1700402
Shroba's knowledge of the surficial geology in the greater Omaha area was enhanced by informative discussions with Vincent Dreezen, Duane Eversoll, Joseph Mason, Vernon Souders, and Scott Summerside of the Nebraska Conservation and Survey Division. Earlier versions of this map were prepared with digital assistance provided from Maria Furey of the U.S. Geological Survey. This report was improved greatly by helpful reviews by Joseph Mason of the Nebraska Conservation and Survey Division and David Fullerton of the U.S. Geological Survey. Paco Van Sistine, Townsend Management Services, initially processed existing USGS Digital Line Graph data for transportation, hypsography, and hydrography themes used in this map.
303-236-1292 (voice)
303-236-0214 (FAX)
rshroba@usgs.gov
This map provides geologic information for land-use decisions.
Data were entered and checked by the geologist that made the field observations. The attributes of this geospatial data set consist of text identifiers and numeric codes that indicate the identity of the geologic unit or type of geologic feature, and determine how each feature is colored or symbolized. To check attribute accuracy, a color check plot was visually compared to the geologist's original compilation. Discrepancies between the digital geospatial dataset and the original analog compilation were corrected as needed. Machine-created listings of unique attribute values were used to identify spelling errors or other inconsistencies, and corrections were made as needed. This map has been thoroughly reviewed for conformity with U.S. Geological Survey editorial standards and stratigraphic nomenclature.
Lines were primarily positioned by photointerpretation of aerial photography and transferred to 1: 24, 000-scale topographic basemaps by visual inspection. Lines were scanned and vectorized from the basemap from scans with a resolution of 300 dots per inch. Most positions on the map are estimated to be accurate closer than 50 m horizontally.
Data are complete. No features that could be accurately represented at a scale of 1:100,000 were eliminated or generalized. The smallest area represented is approximately 95 square meters. All geospatial database elements are attributed.
Map elements were visually checked for overshoots, undershoots, duplicate features, polygon closure, and other errors by the authors and by the GIS technician(s) who created the digital database. Automated (Arc/Info) routines were also used to check the databases for polygon label errors, line or point attribution errors, sliver polygons, dangling arcs, intersection errors, and projection information. Check plots of the map were reviewed by another geologist and cartographer for consistency with basic geologic principles and general conformity to USGS mapping standards.
Are there legal restrictions on access or use of the data?
- Access_Constraints: none
- Use_Constraints:
- none. Acknowledgment of the U.S. Geological Survey would be appreciated in products derived from these data. Although software enables the user to display images at various scales, map data in this report should not be used at scales greater than 1:100,000.
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Although this digital spatial data has been subjected to rigorous review and is substantially complete, it is released on the condition that neither the USGS nor the United States Government nor any agency thereof, nor any employees thereof, make any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Any views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.
Data format: | Geologic units and structural features in format ArcInfo export (version 7.1.2) Size: 90 megabytes |
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Network links: |
<http://geology.cr.usgs.gov/pub/mf-maps/mf-2391/mf-2391.tar.gz> |
Data format: | Geologic units and structural features in format Shapefile (version 1.0) Size: 90 megabytes |
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Network links: |
<http://geology.cr.usgs.gov/pub/mf-maps/mf-2391/mf-2391.tar.gz> |
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MF-2391 (Map-on-Demand)
None
Available as one map sheet printed on demand on a computer-driven high-resolution plotter. Order from USGS at the address listed above or see <http://rmmcweb.cr.usgs.gov/pub/mod/order.html> for more ordering information.
for current charges please see <http://rmmcweb.cr.usgs.gov/public/mod/order.html>
303-236-1292 (voice)
303-236-0214 (FAX)
rshroba@usgs.gov