Metadata for US_AQUIFERS
Table of Contents
Identification_Information
Abstract
Purpose
Supplemental Information
Data_Quality_Information
Spatial_Data_Organization_Information
Entity_and_Attribute_Information
Detailed Description
Overview
Distribution_Information
Metadata_Reference_Section
Identification_Information
Citation_Information
Originator: James A. Miller (comp.)
Publication_Date: 1998
Title: Principle Aquifers of the 48 Contiguous United States
Geospatial_Data_Presentation_Format: map
Publication_Information
Publication_Place: Madison, Wisconsin
Publisher: U.S. Geological Survey
Online_Linkage: http://www.nationalatlas.gov/aquifersm.html
Description
Abstract
This data set contains the shallowest principal aquifers of the
contiguous United States, portrayed as polygons. The data set was
developed as part of the effort to produce the maps published at
1:2,500,000 in the printed series "Ground Water Atlas of the United
States". The published maps contain base and cultural features not
included in these data.
This dataset was downloaded from http://nationalatlas.gov by the
Cornell University GIS Group in shapefile format. The Cornell GIS
Group converted the shapefile to an ARC/INFO coverage and created this
metadata file with information from
http://www.nationalatlas.gov/aquifersm.html
Purpose
These data are intended for use in publications, at a scale of
1:2,500,000 or smaller. Due to the small scale, the primary intended
use is for regional and national data display and analysis, rather
than specific local data analysis.
Supplemental_Information
Procedures_Used
Aquifer outcrop line work for each GWA chapter was compiled on mylar
at a scale of 1:2,000,000, and reduced to 1:2,500,000 for further
production work. For chapters HA 730-G, -H, and -J, the outcrop lines
were scribed at a line width of 0.006 inch. Film positives made from
the scribed materials were scanned on a drum scanner, vectorized, and
converted to ARC/INFO coverages. For chapters HA 730-B, -C, -D, -E,
-F, -I, -K, -L, and -M, the aquifer compilation was either hand
digitized, and (or) scanned on a drum scanner, vectorized and
converted to ARC/INFO coverages. The data were then checked, cleaned
up, and attribute creation was done.
The ARC/INFO coverages were plotted and checked against the source
compilations. Polygons were attributed using Arcedit. The coverages
for GWA chapters HA 730-B, -C, -D, -E, -F, -I, -K, -L, and -M were
used to generate output files that were imported into Adobe
Illustrator for map publication. Each completed map, at a scale of
1:2,500,000, was reviewed for content and accuracy by the chapter lead
cartographer, Water Resources Division Geohydrologic Map Editor, and
chapter author.
Individual chapter coverages were appended into one continuous
coverage. Arcedit was used for edgematching and to remove duplicate
labels. No DISSOLVE was done on the coverage; an equivalent of a
DISSOLVE was done manually in Arcedit in conjunction with attribute
checking, by removing arcs that divided adjacent polygons with the
same attributes. Several iterations of editing were performed. These
mostly involved ensuring all polygons had labels and aquifer
information and ensuring polygons had correct aquifer information. No
polygons were removed for generalization.
Plots of the national aquifers file were made at 1:2,500,000,
covering the areas of the regional GWA chapters. Each plot was
compared to the printed GWA chapter aquifer maps. Where applicable
(chapters HA 730-B, -C, -D, -E, -F, -I, -K, - L, and -M), an Adobe
Illustrator file of the coverage data was compared on-screen with the
Illustrator file used to print the published map. Discrepancies
between the coverage file and print file were noted, and the coverage
updated to match the published map. Where a line appeared to shift
noticeably (approximately 1/8 inch at a scale of 1:2,500,000) across
the boundary of two adjacent GWA chapter regions, the line was
adjusted for a smoother appearance. The adjustments may have been made
on one or both sides of the region boundary, depending on a
cartographic assessment of the instance.
Coastline Location The 1:2,500,000 principal aquifer maps in the
Ground Water Atlas publications used a coastline and international
boundary, derived either from the map separates from the National
Atlas of the United States of America (published 1970), or from the
Digital Line Graph (DLG) data created from the 1970 National Atlas.
GWA chapters HA 730-G, -J, and -H used coastline and boundary filmwork
photo-mechanically reduced from the 1:2,000,000 National Atlas map
separates. The remaining chapters used coastline and boundary data
from the DLGs. A revision of the DLG data took place in 1997, after
the creation of the chapter aquifer map data.
After the edgematching, a decision was made to replace the coast and
international boundary of this national- level aquifer data with one
derived from a newer version of 1997 DLG data. State boundary data
from the U.S. Geological Survey National Mapping Division was used to
provide the coastline and two aquifer boundaries that coincide with
State lines. A publicly available version of this data and its
metadata (Map Layer Theme: States) can be found at:
The existing outline (coastline and international boundary line) was
removed, the new outline added to the coverage, and the remaining
aquifer contact lines snapped to the new outline. The coverage was
re-cleaned, data categories checked onscreen and with plots, and
corrected. Line and labeling corrections, such as undershoots,
overshoots, and improper labels were corrected in Arcedit.
There are some slight locational differences between this data set
and the printed GWA chapters. For example, there are several small
differences in the number of small islands in coastal areas and the
categorization of these small islands was assigned to either the
nearby principal aquifer category or as Not a principal aquifer,
depending on the location and categorization of similar small islands
in the printed GWA chapters. There are other differences in the
categorization of some land/shoreline-related features. For example,
an area symbolized as a bay in a GWA chapter may be land in this data
set.
Western Montana During the review of a printed map made from this
national-level aquifer data, the compiler, James A. Miller, requested
a change in the representation of aquifers in western Montana. The
area affected is in the following counties: Lincoln, Flathead,
Sanders, Lake, Mineral, Missoula, Powell, Ravalli, Granite, Lewis and
Clark, Deer Lodge, Silver Bow, Jefferson, Broadwater, Gallatin,
Beavershead, and Madison. These areas fall under the Northern Rocky
Mountain Intermontane Basins Regional Aquifer Systems Analysis (RASA).
With one exception, the aquifers, as shown in GWA chapter I, figure 7
in the listed counties were removed and replaced with
unconsolidated-deposit areas as shown in GWA chapter HA 730-I, figure
6. The exception is an area in northern Flathead county, listed as an
Upper Tertiary aquifer in GWA chapter I, figure 7, that was retained
as an area but reclassified as a Lower Tertiary aquifer.
Revisions
See procedures used section of this metadata file.
Reviews_Applied_to_Data
information not available
Related_Spatial_and_Tabular_Data_Sets
Related Spatial and Tabular Data Sets A data set showing the extent
of glacial deposits is included in the online, interactive National
Atlas of the United States, but is not available to download. This
data set shows the southern limit of glaciation in the United States;
areas north of the limit line may contain significant sand and gravel
glacial deposits that are important sources of water for local areas.
References_Cited
Planert, M. and Williams, J.S. (comp.), 1995, Ground Water Atlas of
the United States-Segment 1: California, Nevada, Hydrologic
Investigations Atlas, HA 730-B, Reston, Virginia: U.S. Geological
Survey.
Robson, S.G. and Banta, E.R. (comp.), 1995, Ground Water Atlas of the
United States-Segment 2: Arizona, Colorado, New Mexico, Utah,
Hydrologic Investigations Atlas, HA 730-C, Reston, Virginia: U.S.
Geological Survey.
Miller, J.A. and Appel, C.L. (comp.) 1998, Ground Water Atlas of the
United States-Segment 3: Kansas, Missouri, Nebraska, Hydrologic
Investigations Atlas, HA 730-D, Reston, Virginia Publisher: U.S.
Geological Survey.
Ryder, P.D. (comp.), 1996, Ground Water Atlas of the United
States-Segment 4: Oklahoma, Texas, Hydrologic Investigations Atlas,
HA 730-E, Reston, VA: U.S. Geological Survey.
Renken, R.A. (comp.), 1998, Ground Water Atlas of the United
States-Segment 5: Arkansas, Louisiana, Mississippi, Hydrologic
Investigations Atlas, HA 730-F, Reston, VA: U.S. Geological Survey.
Miller, J.A. (comp.), 1990, Ground Water Atlas of the United
States-Segment 6: Alabama, Florida, Georgia, and South Carolina,
Hydrologic Investigations Atlas, HA 730-G, Reston, VA, U.S. Geological
Survey.
Whitehead, R.L. (comp.), 1994, Ground Water Atlas of the United
States-Segment 7: Idaho, Oregon, Washington, Hydrologic
Investigations Atlas, HA 730-H, Reston, VA: U.S. Geological Survey.
Whitehead, R.L. (comp.), 1996, Ground Water Atlas of the United
States-Segment 8: Montana, North Dakota, South Dakota, Wyoming,
Hydrologic Investigations Atlas, HA 730-I, Reston, VA, U.S.
Geological Survey.
Olcott, P.G. (comp.), 1992, Ground Water Atlas of the United
States-Segment 9: Iowa, Michigan, Minnesota, Wisconsin, Hydrologic
Investigations Atlas, Reston, VA: U.S. Geological Survey.
Lloyd, O.B., Jr., and Lyke, W.L. (comp.), 1995, Ground Water Atlas
of the United States-Segment 10: Illinois, Indiana, Kentucky, Ohio,
Tennessee, Hydrologic Investigations Atlas, HA 730-K, Reston, VA: U.S.
Geological Survey.
Trapp, H., Jr. and Horn, M.A. (comp.), 1997, Ground Water Atlas of
the United States-Segment 11: Delaware, Maryland, New Jersey, North
Carolina, Pennsylvania, Virginia, West Virginia, Hydrologic
Investigations Atlas, HA 730-L, Reston, VA: U.S. Geological Survey.
Olcott, P.G. (comp.), 1995, Ground Water Atlas of the United
States-Segment 12: Connecticut, Maine, Massachusetts, New Hampshire,
New York, Rhode Island, Vermont, Hydrologic Investigations Atlas,
HA 730-M, Reston, VA: U.S. Geological Survey.
United States Geological Survey, 1998, State Boundaries, Reston, VA:
U.S. Geological Survey.
U.S. Geological Survey, Water Resources Division, Unpublished
material, National aquifers file, Reston, VA: U.S. Geological Survey.
Notes
Although these data have been processed successfully on a computer
system at the U.S. Geological Survey, no warranty expressed or implied
is made by the U.S. Geological Survey regarding the utility of the
data on any other system, nor shall the act of distribution constitute
any such warranty.
Time_Period_of_Content
Single_Date/Time
Calendar_Date: 1998
Currentness_Reference
1998
Status
Progress: complete
Maintenance_and_Update_Frequency
as needed
Spatial_Domain
Bounding_Coordinates
West_Bounding_Coordinate:
East_Bounding_Coordinate:
North_Bounding_Coordinate:
South_Bounding_Coordinate:
Keywords
Theme
Theme_Keyword_Thesaurus: None
Theme_Keyword: United States, Aquifers
Place
Place_Keyword_Thesaurus: None
Place_Keyword: United States
Stratum
Stratum_Keyword_Thesaurus: None
Stratum_Keyword:
Temporal
Temporal_Keyword_Thesaurus: None
Temporal_Keyword:
Access_Constraints
None. Acknowledgment of the Ground Water Atlas of the United States
and (or) the National Atlas of the United States of America would be
appreciated in products derived from these data.
Use_Constraints
The Ground Water Atlas of the United States (GWA) chapters include
additional information that may be relevant to the use of this data
set, such as maps of alluvial and glacial aquifers that overlie the
aquifers in this data set, as well as other information described
below.
The areal extent of the aquifers, as shown in this data set,
represents the area in which a named aquifer is the shallowest of the
principal aquifers. These aquifer areas are not necessarily the only
areas in which ground water can be withdrawn, for two reasons: 1) The
aquifers shown may have a larger areal extent than is represented
here. The boundaries in this data set generally represent an
interpretation of the surface location (outcrop), or near- surface
location (shallow subcrop) of the uppermost principal aquifer for the
area. An aquifer may extend beyond the area shown, but be overlain by
one or more other aquifers, and (or) low-permeability material.
2) There may be areas of water-bearing surficial material not shown
in this data set. Major alluvial aquifers that occur along main
watercourses are not shown. Significant unconsolidated sand and
]gravel aquifers, that are not indicated in this data set but are
important sources of water, may occur locally in glaciated regions.
The user of this data set is advised that to get complete information
regarding areas that serve as sources of water, more information
about surficial aquifers needs to be obtained, particularly in
glaciated areas.
This data set was constructed by combining data created for or from
the regional GWA chapters. Minor aquifers that are important local
sources of water were mapped in some regions, so the regional maps in
the GWA may show more detail than this data set. The juxtaposition of
regionally mapped aquifers has led to some instances where an aquifer
outcrop or shallow subcrop is bounded by a State line. This is a
result of the regional mapping and national categorization methods
used and is not meant to imply a hydrogeologic change coincident with
a State boundary.
The aquifer outcrop and shallow subcrop boundaries represent broad,
regional categories and should not be interpreted as site-specific.
Comments regarding the names of aquifers or the hydrogeologic
interpretation of the aquifers can be directed to the U.S. Geological
Survey, Water Resources Division, Office of Ground Water, Roy
Sonenshein, sunshine@usgs.gov, (305) 717-5824.
This data set was used as part of the effort to publish a
1:5,000,000-scale Principal Aquifers map in the National Atlas of
the United States of America series of printed maps. The printed map
can be considered a representation of this data set with the
exceptions of: the smaller scale, slight differences in the coastline
due to generalization, base and cultural information, and delineation
of the glacial-deposit area.
These data were developed in conjunction with the publication of
the GWA. For documentation purposes, areas are referred to by their
corresponding GWA chapter letter, or by State. This list shows the
relationship between State names and GWA chapters:
HA 730-B Segment 1-California, Nevada
HA 730-C Segment 2-Colorado, Utah, New Mexico, Arizona
HA 730-D Segment 3-Kansas, Missouri, Nebraska
HA 730-E Segment 4-Texas, Oklahoma
HA 730-F Segment 5-Arkansas, Louisiana, Mississippi
HA 730-G Segment 6-Alabama, Florida, Georgia, South Carolina
HA 730-H Segment 7-Idaho, Oregon, Washigton
HA 730-I Segment 8-Montana, North Dakota, South Dakota, Wyoming
HA 730-J Segment 9-Iowa, Michigan, Minnesota, Wisconsin
HA 730-K Segment 10-Illinois,Indiana, Kentucky, Ohio,
Tennessee
HA 730-L Segment 11-Delaware, Maryland, New North Carolina,
Pennsylvania, Virginia,West Virginia
HA 730-M Segment 12-Connecticut, Maine, Massachusetts, New
Hampshire, New York, Rhode Island, Vermont
Refer to: for
a graphic depiction of the GWA chapter regions, as well as more
information about the GWA.
Although these spatial data can stand alone, it may be helpful to
refer to the printed GWA chapters when using the data. There are three
subject areas in which there are significant differences between this
data set and the printed chapters: category changes, which are
described below; coastline location, and the representation of
aquifers in Western Montana, both of which are discussed in the
Process Description under Lineage.
Category Changes Because the GWA regional chapters were written by
different authors, there were areas of different interpretations and
category delineations, aquifer names, etc., that became apparent when
combining the regions. In most cases, the name and delineation of the
aquifer is identical between this data set and the GWA printed maps,
but there are several areas of differences. In some cases, a single
aquifer from a GWA chapter is represented among multiple aquifers in
this data set. The following listings show the differences between
aquifer names in the GWA chapters and the aq_name and aq_code used in
this data set. See the Entity and Attribute Information section for
definitions of the data attributes.
GWA chapter HA 730-B
Name from fig 11, page B4 aq_code-aq_name
Basin and Range volcanic- 601-Southern Nevada
rock aquifers volcanic-rock aquifers
Coastal Basins aquifers 103-California Coastal Basin
aquifers
Northern California Basin 104-Pacific Northwest
fill aquifers basin-fill aquifers
GWA chapter HA 730-C
Name from fig 11, page C4
Names and categories the same
GWA chapter HA 730-D
Name from fig 5, page D4 aq_code-aq_name
Mississippi embayment 109-Mississippi River Valley
aquifer system alluvial aquifer
Great Plains aquifer 304-Lower Cretaceous
aquifers system
Confining unit 999-Not a principal aquifer
Not a principal aquifer 999-Not a principal aquifer
Dune sand 107-High Plains aquifer
GWA chapter HA 730-E
Name from fig 4, page E3 aq_code-aq_name
EDWARDS-TRINITY AQUIFER SYSTEM
Edwards-Trinity aquifer 501-Edwards-Trinity aquifer
system
Edwards aquifer 501-Edwards-Trinity aquifer
system
Trinity aquifer 501-Edwards-Trinity aquifer
system
Confining unit 999-Not a principal aquifer
GWA chapter HA 730-F
Name from fig 7, page 4 aq_code-aq_name
MAJOR AQUIFER SYSTEMS
Surficial aquifer system 109-Mississippi River Valley
alluvial aquifer
203-Mississippi embayment
aquifer system
501-Edwards-Trinity aquifer
system
999-Not a principal aquifer
Mississippi embayment 109-Mississippi River Valley
aquifer system alluvial aquifer
203-Mississippi embayment
aquifer
204-Southeastern Coastal
Plain aquifer system
999-Not a principal aquifer
MINOR AQUIFERS AND AQUIFER SYSTEMS - Aquifer systems in
rocks of cretaceous age
Edwards-Trinity aquifer 501-Edwards-Trinity aquifer
system (Trinity aquifer) system
Tokio-Woodbine aquifer 999-Not a principal aquifer
Ouachita Mountains aquifer 999-Not a principal aquifer
CONFINING SYSTEMS AND CONFINING UNITS
Western Interior Plains 999-Not a principal aquifer
confining systems
Confining unit 109-Mississippi River Valley
alluvial aquifer
203-Mississippi embayment
aquifer system
999-Not a principal aquifer
GWA chapter HA 730-G
Name from fig 3, page 3 aq_code-aq_name
Sand and gravel aquifer 201-Coastal lowlands aquifer
system
Piedmont and Blue Ridge 999-Not a principal aquifer
aquifers
Appalachian Plateaus 310-Pennsylvanian aquifers
aquifers
Interior Low Plateaus 503-Mississippian aquifers
aquifers
Confining unit 999-Not a principal aquifer
GWA chapter HA 730-H
Name from fig 5, page H4 aq_code-aq_name
Unconsolidated-deposit 104-Pacific Northwest
aquifers basin-fill aquifers
112-Puget-Willamette Lowland
aquifer system
105-Northern Rocky Mountains
Intermontane basins
aquifer system
101-Basin and Range aquifers
Pliocene and younger 603-Pliocene and younger
basaltic-rock aquifers basaltic-rock aquifers
606-Snake River Plain
aquifer system
Miocene basaltic-rock 607-Columbia Plateau aquifer
aquifers system
604-Miocene basaltic-rock
aquifers
Aquifers in pre-Miocene 401-Basin and Range
rocks carbonate-rock aquifers
999-Not a principal aquifer
GWA chapter HA 730-I. See Process Description regarding
differences between this data and the printed Ground Water
Atlas chapter in Western Montana
Name from fig 7, page I4 aq_code-aq_name
Quaternary volcanic and 605-Volcanic and
sedimentary rock aquifers sedimentary-rock
aquifers
Upper Tertiary aquifers 107-High Plains aquifer
316-Wyoming Tertiary
aquifers
Lower Tertiary aquifers 107-High Plains aquifer
314-Lower Tertiary aquifers
Upper Cretaceous aquifers 301-Colorado Plateaus
aquifers
315-Upper Cretaceous
aquifers
Lower Cretaceous aquifers 301-Colorado Plateaus
aquifers
304-Lower Cretaceous aquifer
Confining unit 301-Colorado Plateaus
aquifers
GWA chapter HA 730-J
Name from fig 7, page J4 aq_code-aq_name
Cretaceous aquifer 304-Lower Cretaceous
aquifers
MISSISSIPPIAN AQUIFER
Carbonate rocks 503-Mississippian aquifers
Sandstone 311-Mississippian aquifers
of Michigan
Crystalline-rock aquifer 999-Not a principal aquifer
Confining unit 999-Not a principal aquifer
GWA chapter HA 730-K
Name from fig 5, page K4 aq_code-aq_name
Blue Ridge aquifers 308-Early Mesozoic basin
aquifers
999-Not a principal aquifer
MISSISSIPPI EMBAYMENT AQUIFER SYSTEM
Upper Claiborne, middle 203-Mississippi embayment
Claiborne, middle Wilcox, aquifer system
and lower Wilcox 109-Mississippi River Valley
alluvial aquifer
McNairy-Nacatoch 204-Southeastern Coastal
Plain aquifer system
Confining unit 999-Not a principal aquifer
GWA chapter HA 730-L
Name from fig 7, page L4 aq_code-aq_name
NORTHERN ATLANTIC COASTAL PLAIN AQUIFER SYSTEM
Surficial aquifer 111-Surficial aquifer system
Chesapeake aquifer 205-Northern Atlantic
Coastal Plain aquifer system
Castle Hayne-Aquia aquifer 418-Castle Hayne aquifer
Severn-Magothy aquifer 205-Northern Atlantic
Coastal Plain aquifer system
Peedee-upper Cape Fear 205-Northern Atlantic
quifer Coastal Plain aquifer system
Potomac aquifer 205-Northern Atlantic
Coastal Plain aquifer system
PIEDMONT AND BLUE RIDGE AQUIFERS
Aquifers in early Mesozoic 308-Early Mesozoic basin
basins aquifers
Carbonate-rock aquifers 417-Piedmont and Blue Ridge
carbonate-rock aquifers
Crystalline-rock aquifers 999-Not a principal aquifer
Valley and Ridge 505-Valley and Ridge
carbonate-rock aquifers carbonate-rock aquifers
416-New York and New England
carbonate-rock aquifers
APPALACHIAN PLATEAUS
Permian and Pennsylvanian 310-Pennsylvanian aquifers
aquifers
GWA chapter HA 730-M
Name from fig 10, page M5 aq_code-aq_name
CARBONATE-ROCK AQUIFERS
New York and New England 416-New York and New England
carbonate-rock aquifers
Valley and Ridge 416-New York and New England
carbonate-rock aquifers
SANDSTONE AQUIFERS
Mesozoic sandstone and 308-Early Mesozoic basin
basalt of the Newark aquifers
Supergroup
Lower Paleozoic 309-New York sandstone
aquifers
CRYSTALLINE-ROCK AQUIFERS
Adirondack 999-Not a principal aquifer
New England 999-Not a principal aquifer
Related Spatial and Tabular Data Sets A data set showing the extent
of glacial deposits is included in the online, interactive National
Atlas of the United States, but is not available to download. This
data set shows the southern limit of glaciation in the United States;
areas north of the limit line may contain significant sand and gravel
glacial deposits that are important sources of water for local areas.
A data set of aquifers of Alaska is in work.
A data set of aquifers of Puerto Rico and the U.S. Virgin Islands is
in work.
A data set of aquifers of Hawaii is planned.
The final data are being served to the public in the following
formats: Spatial Data Transfer Standard (SDTS), ARC/INFO Export, or
ArcView Shapefile.
Point_of_Contact: See Distribution_Information for contact information.
Data_Set_Credit
This data set was created and modified over a period of at least
five years by several staff members of the U.S. Geological Survey
Water Resources Division Cartographic and Publications Program in
Madison, Wisconsin. Completion of this data set and associated
metadata was funded, in part, under a cooperative joint funding
agreement between the U.S. Geological Survey and the U.S.
Environmental Protection Agency.
Security_Information
Security_Classification_System: None
Security_Classification: UNCLASSIFIED
Security_Handling_Description: None
Native_Data_Set_Environment: SunOS UNIX, ARC/INFO version 7.2.1
Cross_Reference
Originator: U.S. Geological Survey
Publication_Date:
Publication_Time:
Title:
Edition:
Geospatial_Data_Presentation_Form:
Series_Information
Series_Name:
Issue_Identification:
Publication_Information
Publication_Place:
Publisher:
Other_Citation_Details:
Online_Linkage:
Larger_Work_Citation:
Data_Quality_Information
Attribute_Accuracy
Attribute_Accuracy_Report: See Entity_Attribute_Information
Quantitative_Attribute_Accuracy_Assessment
Attribute_Accuracy_Value: See Explanation
Attribute_Accuracy_Explanation:
Attribute accuracy is described, where present, with each
attribute defined in the Entity and Attribute Section.
Logical_Consistency_Report: Polygon and chain-node topology present.
Completeness_Report
This data set includes aquifer information for the 48 contiguous
United States.
Positional_Accuracy
Horizontal_Positional_Accuracy
Horizontal_Positional_Accuracy_Report:
not available
Vertical_Positional_Accuracy
Vertical_Positional_Accuracy_Report:
not available
Lineage: See Supplemental_Information for overview.
Process_Steps
Cloud_Cover
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: 4350
SDTS_Point_and_Vector_Object_Type: String
Point_and_Vector_Object_Count: 7128
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains'
Point_and_Vector_Object_Count: 4351
Spatial_Reference_Information
Horizontal_Coordinate_System_Definition
Projection: Unknown
Entity_and_Attribute_Information
Detailed_Description
Entity_Type
Entity_Type_Label: US_AQUIFERS.PAT
Entity_Type_Definition: aquifers iformation explanation
Entity_Type_Definition_Source: ARC/INFO
Attribute:
Attribute_Label: -
Attribute_Definition: aquifers iformation explanation
Attribute_Definition_Source: ARC/INFO
Attribute_Domain_Values
Enumerated_Domain
Enumerated_Domain_Value: -
Enumerated_Domain_Value_Definition
Enumerated_Domain_Value_Definition_Source:
Attribute:
Attribute_Label: AREA
Attribute_Definition: Area of poly/region in square coverage units
Attribute_Definition_Source: Computed
Attribute_Domain_Values
Enumerated_Domain
Enumerated_Domain_Value: Positive real numbers
Enumerated_Domain_Value_Definition
Enumerated_Domain_Value_Definition_Source:
Attribute:
Attribute_Label: PERIMETER
Attribute_Definition: Perimeter of poly/region in coverage units
Attribute_Definition_Source: Computed
Attribute_Domain_Values
Enumerated_Domain
Enumerated_Domain_Value: Positive real numbers
Enumerated_Domain_Value_Definition
Enumerated_Domain_Value_Definition_Source:
Attribute:
Attribute_Label: US_AQUIFERS#
Attribute_Definition: Internal feature number
Attribute_Definition_Source: Computed
Attribute_Domain_Values
Enumerated_Domain
Enumerated_Domain_Value: Sequential unique positive integer
Enumerated_Domain_Value_Definition
Enumerated_Domain_Value_Definition_Source:
Attribute:
Attribute_Label: US_AQUIFERS-ID
Attribute_Definition: User-assigned feature number
Attribute_Definition_Source: User-defined
Attribute_Domain_Values
Enumerated_Domain
Enumerated_Domain_Value: Integer
Enumerated_Domain_Value_Definition
Enumerated_Domain_Value_Definition_Source:
Attribute:
Attribute_Label: POLY#
Attribute_Definition:
Attribute_Definition_Source:
Attribute_Domain_Values
Enumerated_Domain
Enumerated_Domain_Value:
Enumerated_Domain_Value_Definition
Enumerated_Domain_Value_Definition_Source:
Attribute:
Attribute_Label: SUBCLASS
Attribute_Definition:
Attribute_Definition_Source:
Attribute_Domain_Values
Enumerated_Domain
Enumerated_Domain_Value:
Enumerated_Domain_Value_Definition
Enumerated_Domain_Value_Definition_Source:
Attribute:
Attribute_Label: SUBCLASS#
Attribute_Definition:
Attribute_Definition_Source:
Attribute_Domain_Values
Enumerated_Domain
Enumerated_Domain_Value:
Enumerated_Domain_Value_Definition
Enumerated_Domain_Value_Definition_Source:
Attribute:
Attribute_Label: RINGS_OK
Attribute_Definition:
Attribute_Definition_Source:
Attribute_Domain_Values
Enumerated_Domain
Enumerated_Domain_Value:
Enumerated_Domain_Value_Definition
Enumerated_Domain_Value_Definition_Source:
Attribute:
Attribute_Label: RINGS_NOK
Attribute_Definition:
Attribute_Definition_Source:
Attribute_Domain_Values
Enumerated_Domain
Enumerated_Domain_Value:
Enumerated_Domain_Value_Definition
Enumerated_Domain_Value_Definition_Source:
Attribute:
Attribute_Label: AQUIFRP020
Attribute_Definition:
Attribute_Definition_Source:
Attribute_Domain_Values
Enumerated_Domain
Enumerated_Domain_Value:
Enumerated_Domain_Value_Definition
Enumerated_Domain_Value_Definition_Source:
Attribute:
Attribute_Label: AQUIFRP020A
Attribute_Definition:
Attribute_Definition_Source:
Attribute_Domain_Values
Enumerated_Domain
Enumerated_Domain_Value:
Enumerated_Domain_Value_Definition
Enumerated_Domain_Value_Definition_Source:
Attribute:
Attribute_Label: ROCK_NAME
Attribute_Definition: The name of the permeable geologic material that composes the aquifer
Attribute_Definition_Source:
Attribute_Domain_Values
Enumerated_Domain
Enumerated_Domain_Value:
Enumerated_Domain_Value_Definition
Enumerated_Domain_Value_Definition_Source:
Attribute:
Attribute_Label: ROCK_TYPE
Attribute_Definition: The code number relating to the rock_name.
Attribute_Definition_Source:
Attribute_Domain_Values
Enumerated_Domain
Enumerated_Domain_Value:
Enumerated_Domain_Value_Definition
Enumerated_Domain_Value_Definition_Source:
Attribute:
Attribute_Label: AQ_NAME
Attribute_Definition: The aquifer unit name
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values
Enumerated_Domain
Enumerated_Domain_Value:
Enumerated_Domain_Value_Definition
Enumerated_Domain_Value_Definition_Source:
Attribute:
Attribute_Label: AQ_CODE
Attribute_Definition: The code number relating to the aquifer unit name
Attribute_Definition_Source:
Attribute_Domain_Values
Enumerated_Domain
Enumerated_Domain_Value:
Enumerated_Domain_Value_Definition
Enumerated_Domain_Value_Definition_Source:
Entity_Type
Entity_Type_Label: US_AQUIFERS.AAT
Entity_Type_Definition: Aquifer boundaries and internal contacts
Entity_Type_Definition_Source: ARC/INFO
Attribute:
Attribute_Label: -
Attribute_Definition: Aquifer boundaries and internal contacts
Attribute_Definition_Source: ARC/INFO
Attribute_Domain_Values
Enumerated_Domain
Enumerated_Domain_Value: -
Enumerated_Domain_Value_Definition
Enumerated_Domain_Value_Definition_Source:
Attribute:
Attribute_Label: FNODE#
Attribute_Definition: Internal number of from-node
Attribute_Definition_Source: Computed
Attribute_Domain_Values
Enumerated_Domain
Enumerated_Domain_Value: Sequential unique positive integer
Enumerated_Domain_Value_Definition
Enumerated_Domain_Value_Definition_Source:
Attribute:
Attribute_Label: TNODE#
Attribute_Definition: Internal number of to-node
Attribute_Definition_Source: Computed
Attribute_Domain_Values
Enumerated_Domain
Enumerated_Domain_Value: Sequential unique positive integer
Enumerated_Domain_Value_Definition
Enumerated_Domain_Value_Definition_Source:
Attribute:
Attribute_Label: LPOLY#
Attribute_Definition: Internal number of poly to left of arc
Attribute_Definition_Source: Computed
Attribute_Domain_Values
Enumerated_Domain
Enumerated_Domain_Value: Sequential unique positive integer
Enumerated_Domain_Value_Definition
Enumerated_Domain_Value_Definition_Source:
Attribute:
Attribute_Label: RPOLY#
Attribute_Definition: Internal number of poly to right of arc
Attribute_Definition_Source: Computed
Attribute_Domain_Values
Enumerated_Domain
Enumerated_Domain_Value: Sequential unique positive integer
Enumerated_Domain_Value_Definition
Enumerated_Domain_Value_Definition_Source:
Attribute:
Attribute_Label: LENGTH
Attribute_Definition: Length of arc in coverage units
Attribute_Definition_Source: Computed
Attribute_Domain_Values
Enumerated_Domain
Enumerated_Domain_Value: Positive real numbers
Enumerated_Domain_Value_Definition
Enumerated_Domain_Value_Definition_Source:
Attribute:
Attribute_Label: US_AQUIFERS#
Attribute_Definition: Internal feature number
Attribute_Definition_Source: Computed
Attribute_Domain_Values
Enumerated_Domain
Enumerated_Domain_Value: Sequential unique positive integer
Enumerated_Domain_Value_Definition
Enumerated_Domain_Value_Definition_Source:
Attribute:
Attribute_Label: US_AQUIFERS-ID
Attribute_Definition: User-assigned feature number
Attribute_Definition_Source: User-defined
Attribute_Domain_Values
Enumerated_Domain
Enumerated_Domain_Value: Integer
Enumerated_Domain_Value_Definition
Enumerated_Domain_Value_Definition_Source:
Overview_Description
Entity_and_Attribute_Overview
COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC
1 AREA 4 12 F 3
5 PERIMETER 4 12 F 3
9 US_AQUIFERS# 4 5 B -
13 US_AQUIFERS-ID 4 5 B -
17 POLY# 4 5 B -
21 SUBCLASS 13 13 C -
34 SUBCLASS# 4 5 B -
38 RINGS_OK 7 7 I -
45 RINGS_NOK 7 7 I -
52 AQUIFRP020 8 11 F 0
60 AQUIFRP020A 8 11 F 0
68 ROCK_NAME 45 45 C -
113 ROCK_TYPE 4 5 B -
117 AQ_NAME 65 65 C -
182 AQ_CODE 4 5 B -
Several attributes were duplicated when this coverage was converted
from a shapefile to an ARC/INFO coverage. Including, POLY#, SUBCLASS,
SUBCLASS#, RINGS_OK, RINGS_NOK, AQUIFRP020, and AQUIFRP020A.
There is no predefined set of official aquifer names. The names used
in this data set are listed below. There should be a direct
correlation between the values of the rock_type and rock_name
attributes, and between the aq_name and aq_code attributes. The
aq_names are as follows:
aq_code -- aq_name
0 -- null value, assigned to null polygon
101 -- Basin and Range aquifers
102 -- Rio Grande aquifer system
103 -- California Coastal Basin aquifers
104 -- Pacific Northwest basin-fill aquifers
105 -- Northern Rocky Mountains Intermontane Basins aquifer system
106 -- Central Valley aquifer system
107 -- High Plains aquifer
108 -- Pecos River Basin alluvial aquifer
109 -- Mississippi River Valley alluvial aquifer
110 -- Seymour aquifer
111 -- Surficial aquifer system
112 -- Puget-Willamette Lowland aquifer system
201 -- Coastal lowlands aquifer system
202 -- Texas coastal uplands aquifer system
203 -- Mississippi embayment aquifer system
204 -- Southeastern Coastal Plain aquifer system
205 -- Northern Atlantic Coastal Plain aquifer system
301 -- Colorado Plateaus aquifers
302 -- Denver Basin aquifer system
304 -- Lower Cretaceous aquifers
305 -- Rush Springs aquifer
306 -- Central Oklahoma aquifer
307 -- Ada-Vamoosa aquifer
308 -- Early Mesozoic basin aquifers
309 -- New York sandstone aquifers
310 -- Pennsylvanian aquifers
311 -- Mississippian aquifer of Michigan
312 -- Cambrian-Ordovician aquifer system
313 -- Jacobsville aquifer
314 -- Lower Tertiary aquifers
315 -- Upper Cretaceous aquifers
316 -- Wyoming Tertiary aquifers
401 -- Basin and Range carbonate-rock aquifers
402 -- Roswell Basin aquifer system
405 -- Ozark Plateaus aquifer system
406 -- Blaine aquifer
407 -- Arbuckle-Simpson aquifer
410 -- Silurian-Devonian aquifers
411 -- Ordovician aquifers
412 -- Upper carbonate aquifer
413 -- Floridan aquifer system
414 -- Biscayne aquifer
416 -- New York and New England carbonate-rock aquifers
417 -- Piedmont and Blue Ridge carbonate-rock aquifers
418 -- Castle Hayne aquifer
501 -- Edwards-Trinity aquifer system
502 -- Valley and Ridge aquifers
503 -- Mississippian aquifers
504 -- Paleozoic aquifers
505 -- Valley and Ridge carbonate-rock aquifers
601 -- Southern Nevada volcanic-rock aquifers
602 -- Northern California volcanic-rock aquifers
603 -- Pliocene and younger basaltic-rock aquifers
604 -- Miocene basaltic-rock aquifers
605 -- Volcanic-and sedimentary-rock aquifers
606 -- Snake River Plain aquifer system
607 -- Columbia Plateau aquifer system
999 -- Not a principal aquifer (field left blank). Rocks that are
generally poorly permeable but locally may contain productive
aquifers.
Entity_and_Attribute_Detail_Citation: Not Available
Distribution_Information
Metadata_Reference_Section
Metadata_Date: 19991214
Metadata_Contact:
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: 19940608
Metadata_Time_Convention: Local Time
Metadata_Security_Information:
Metadata_Security_Classification_System: None
Metadata_Security_Classification: UNCLASSIFIED
Metadata_Security_Handling_Description: None
Last modified: 99-12-14.14:51:10.Tue