USGS

HPBEDROCK -- Bedrock formations underlying the High Plains aquifer.

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Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Joshua M. Torres, David W. Litke, and Sharon L. Qi
Publication_Date: 19990322
Title:
HPBEDROCK -- Bedrock formations underlying the High Plains aquifer.
Edition: (Version 1.0, March 22, 1999)
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Lakewood, Colorado
Publisher: U.S. Geological Survey
Online_Linkage:
<http://water.usgs.gov/lookup/getspatial/ofr99-214_hpbedrock>

Description:
Abstract:

This geospatial data set consists of the bedrock formations of the High Plains aquifer, which underlies parts of Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming.

Purpose:

This data set was created to assist in the regional analysis of water quality in the High Plains aquifer as part of the National Water- Quality Assessment (NAWQA) program - High Plains Region study unit.

Supplemental_Information:

Introduction

This data set consists of polygons representing the underlying bedrock formations of the High Plains aquifer. The data set was composed through the integration of two map sources that were digitally captured. The first source was used to define the exterior boundaries of the High Plains aquifer. The second source defines interior boundaries of the underlying bedrock formations. These formations underlie parts of Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming. This data set is intended for regional analysis only, as the precise boundaries of these formations are not well defined and, therefore, are somewhat subjective in nature.

The exterior boundary, defining the extent of the aquifer, was acquired through a previously digitized 1:1,000,000-scale map of the High Plains aquifer that was originally created by Donald Schild and Debra Spahr as part of the Regional Aquifer Systems Analysis (RASA) program. The original source map for the High Plains aquifer boundary was drawn on mylar by Weeks and Gutentag in 1979 (OFR 80-50). This was in turn simplified by McGrath and Dugan in 1993 (WRI 93-4008). This version by McGrath and Dugan is used as the aquifer boundary in this coverage.

Boundaries for the bedrock formations were acquired from a documented graphical representation of the bedrock formations of the High Plains aquifer originally created by Gutentag and others (1984) at a 1:6,336,000 scale.

Reviews Applied to Data --

Other References Cited -- Gutentag, E.D., Heimes, F.J., Krothe, N.C., Luckey, R.R., and Weeks, J.B., 1984, Geohydrology of the High Plains aquifer in parts of Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming: U.S. Geological Survey Professional Paper 1400-B, 63 p.

McGrath, T., and Dugan, J.T., 1993, Water-level changes in the High Plains Aquifer--Predevelopment to 1991: U.S. Geological Survey Water-Resource Investigations Report 93-4088, 53 p.

Notes --

Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Although this data set has been used by the U.S. Geological Survey (USGS), U.S. Department of the Interior, no warranty expressed or implied is made by the USGS as to the accuracy of the data and related materials.

The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of this data set, software, or related materials.

Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19990322
Currentness_Reference: 1999

Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed

Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -106.01563031
East_Bounding_Coordinate: -96.25973783
North_Bounding_Coordinate: 43.8062315
South_Bounding_Coordinate: 31.65255475

Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: High Plains aquifer
Theme_Keyword: Bedrock Hydrology
Theme_Keyword: National Water-Quality Assessment

Place:
Place_Keyword_Thesaurus: None
Place_Keyword: High Plains
Place_Keyword: Great Plains
Place_Keyword: Colorado
Place_Keyword: Kansas
Place_Keyword: Nebraska
Place_Keyword: New Mexico
Place_Keyword: Oklahoma
Place_Keyword: South Dakota
Place_Keyword: Texas
Place_Keyword: Wyoming

Access_Constraints: none

Use_Constraints:
Because these data are a representation of regional bedrock formations underlying the High Plains aquifer, the boundaries of these formations are somewhat subjective. Therefore, the data set should be used only for regional analysis. Furthermore, the user of this data set should consider that the map lines constituting the internal boundaries were created from a source map with a smaller scale (1:6,431,000) than the boundary (1:1,000,000).

Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Joshua M. Torres
Contact_Organization: U.S. Geological Survey
Contact_Position: Hydrologic Technician
Contact_Address:
Address_Type: mailing address
Address: Box 25046, MS 415
City: Lakewood
State_or_Province: Colorado
Postal_Code: 80225
Country: USA
Contact_Voice_Telephone: (303) 236-4882 x302
Contact_Facsimile_Telephone: (303) 236-4912
Contact_Electronic_Mail_Address: jmtorres@usgs.gov

Data_Set_Credit:
Assistance in the construction of this data set was provided by David W. Litke and Sharon L. Qi of the USGS High Plains NAWQA.

Native_Data_Set_Environment:
dgux, R4.11MU04, AViiON UNIX ARC/INFO version 7.0.4


Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The attributes for this map consist of the geologic age of the bedrock formations. Formations were identified through consultation between the USGS and state geologists. Appropriate geologic ages for each formation were then assigned.

Logical_Consistency_Report:
Polygon topology present. The data set was checked for errors by using the Arc/Info commands NODEERRORS and LABELERRORS.

Completeness_Report:
For the purpose of this data set, coded surfaces where the aquifer does not exist within the boundaries of the aquifer have been coded as 'ISLAND' under GEO_UNIT in the PAT file.

Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The accuracy of original linework is unknown. However, the coverage was plotted and compared to a mylar copy of the Gutentag and Weeks (1984) map. Line accuracy was within one line width of the original map, that is, plus or minus 0.053 inches on the original map.

Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Ed Gutentag and John Weeks, USGS
Publication_Date: 1984
Title: Geohydrology of the High Plains aquifer in parts of Colorado
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name: Open-File Report
Issue_Identification: USGS OFR 99-214
Series_Name: U.S. Geological Survey Professional Paper
Issue_Identification: 1400-B
Publication_Information:
Publication_Place: Washington, D.C.
Publisher: United States Government
Source_Scale_Denominator: 6,336,000
Type_of_Source_Media: mylar
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1984
Source_Currentness_Reference: (currentness text)
Source_Citation_Abbreviation: USGS PRO PAPER 1400-B
Source_Contribution: Geology of bedrock units... p. 14.

Source_Information:
Source_Citation:
Citation_Information:
Originator: Ed Gutentag and John Weeks, USGS
Publication_Date: 1980
Title: Water Table in the High Plains aquifer in 1978
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name: Open-File Report
Issue_Identification: USGS OFR 99-214
Series_Name: U.S. Geological Survey Open-File Report
Issue_Identification: OFR 80-50
Publication_Information:
Publication_Place: Lakewood, Colorado
Publisher: United States Government
Source_Scale_Denominator: 1000000
Type_of_Source_Media: mylar
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1980
Source_Currentness_Reference: (currentness text)
Source_Citation_Abbreviation: OFR 80-50
Source_Contribution: OFR 80-50

Source_Information:
Source_Citation:
Citation_Information:
Originator: Timothy McGrath and Jack T. Dugan, USGS
Publication_Date: 1993
Title: Water-level changes in the High Plains aquifer
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name: Open-File Report
Issue_Identification: USGS OFR 99-214
Series_Name:
U.S. Geological Survey Water-Resource Investigations Report.
Issue_Identification: WRI 93-4008
Publication_Information:
Publication_Place: Lakewood, Colorado
Publisher: United States Government
Source_Scale_Denominator: 1000000
Type_of_Source_Media: mylar
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1993
Source_Currentness_Reference: (currentness text)
Source_Citation_Abbreviation: WRI 93-4008, p. 53
Source_Contribution: WRI 93-4008, p. 53

Process_Step:
Process_Description:
The first process step was to scan the Gutentag and others (1984) map and bring it into ARC as a grid (using the IMAGEGRID command).
Process_Date: 19990317

Process_Step:
Process_Description:
This image was then vectorized using GRIDLINE. This resulting vector data set was edited using the original scanned image as a backdrop. Lines were generalized to a weed tolerance of 0.005.
Process_Date: 19990317

Process_Step:
Process_Description:
The data set was transformed from scanner inches into Albers Conical Equal Area projection using 7 tic coordinates. The file showed good registration. RMS error is > 0.005.
Process_Date: 19990317

Process_Step:
Process_Description:
The external boundary of the Gutentag and others (1984) map was deleted and replaced with the standard High Plains boundary. The internal boundaries were then edited in ARCEDIT from a larger scale map. The internal boundaries also were edited in ARCEDIT to make sure internal boundaries and the external boundary were properly joined.
Process_Date: 1999

Process_Step:
Process_Description:
First draft of metadata was created by jmtorres using fgdcmeta.aml from Arc/Info data set /home/splat/jmtorres/scandoc/ofr99-214_hpbedrock
Process_Date: 19990322


Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 36
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: String
Point_and_Vector_Object_Count: 80
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 37


Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: Albers Conical Equal Area
Albers_Conical_Equal_Area:
Standard_Parallel: 29.5
Standard_Parallel: 45.5
Longitude_of_Central_Meridian: -96
Latitude_of_Projection_Origin: 23
False_Easting: 0.00000
False_Northing: 0.00000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 132.3401947021
Ordinate_Resolution: 132.3401947021
Planar_Distance_Units: Meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1927
Ellipsoid_Name: Clarke 1866
Semi-major_Axis: 6378206.4
Denominator_of_Flattening_Ratio: 294.98


Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:

HPBEDROCK.PAT:
COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
    1  AREA                   4    12     F      3
    5  PERIMETER              4    12     F      3
    9  HPBEDROCK#             4     5     B      -
   13  HPBEDROCK-ID           4     5     B      -
   17  GEO_UNIT              25    25     C      -
HPBEDROCK.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  HPBEDROCK#             4     5     B      -
   25  HPBEDROCK-ID           4     5     B      -

GEO_UNIT- Describes the bedrock formation underlying the High Plains aquifer. This attribute consists of five categories: OLIGOCENE- Refers to bedrock formations that originated during the geologic time period of the Oligocene and now underlie the High Plains aquifer. UPPER CRETACEOUS- This attribute refers to the bedrock formation of the Upper Cretaceous age that currently underlies the High Plains aquifer. LOWER CRETACEOUS- This attribute refers to the bedrock formations associated with the Lower Cretaceous that currently underlies the High Plains aquifer. JURASSIC AND TRIASSIC- This attribute refers to bedrock formations of the Jurassic and Triassic age that now underlay the High Plains aquifer. PERMIAN- This attribute refers to bedrock formations of Permian age that currently underlie the High Plains aquifer. ISLAND- This attribute refers to areas where there is no geologic formation associated with the aquifer. TERTIARY- This attribute refers to bedrock formations of Tertiary age that currently underlie the High Plains aquifer.

Entity_and_Attribute_Detail_Citation:
Boundaries for geological formations are displayed in USGS Professional Paper 1400-B p. 14.


Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Position: Water Webserver Team
Contact_Address:
Address_Type: mailing and physical address
Address: 12201 Sunrise Valley Drive, MS 440
City: Reston
State_or_Province: Virginia
Postal_Code: 20192
Country: USA
Contact_Voice_Telephone: (800) 426-9000
Contact_Instructions: Contact by email
Contact_Electronic_Mail_Address: h2oteam@usgs.gov

Distribution_Liability:

Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data.

The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data set, software, or related materials.


Metadata_Reference_Information:
Metadata_Date: 19990322
Metadata_Review_Date: 19990421
Metadata_Future_Review_Date: 19990421
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Joshua M. Torres
Contact_Position: Computer assistant
Contact_Address:
Address_Type: mailing and physical address
Address: Box 25406, MS 415
City: Lakewood
State_or_Province: Colorado
Postal_Code: 80225
Country: USA
Contact_Voice_Telephone: (303) 236-4882 x302
Contact_Facsimile_Telephone: (303) 236-4912
Contact_Electronic_Mail_Address: jmtorres@usgs.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Access_Constraints: none
Metadata_Use_Constraints: none

Generated by mp version 2.4.6 on Thu Jun 24 11:25:52 1999

USGS GIS Data for Water Resources