FLORIDA GEOGRAPHIC DATA LIBRARY DOCUMENTATION
VERSION 2007

TITLE: PRINCIPLE AQUIFERS OF FLORIDA 

Geodataset Name:       AQUIP_OCT03
Geodataset Type:       SHAPEFILE
Geodataset Feature:    Polygon
Feature Count:         357
GENERAL DESCRIPTION:
This map layer contains the shallowest principal aquifers of the state of Florida portrayed as polygons. The map layer was developed as part of the effort to produce the series "Ground Water Atlas of the United States". The published maps contain base and cultural features not included in these data. This is a replacement for the July 1998 map layer called Principal Aquifers of the 48 Conterminous United States created by the U.S. geological Survey. 
DATA SOURCE(S):                    U.S. Geological Survey
SCALE OF ORIGINAL SOURCE MAPS:     Varies
DATE OF AUTOMATION OF SOURCE:      200310
GEODATASET EXTENT:                 State of Florida

FEATURE ATTRIBUTE TABLES: 

Datafile Name: AQUIP_OCT03.DBF
ITEM NAME WIDTH TYPE
OBJECTID
4 OID
ROCK_NAME
40 String
ROCK_TYPE
4 Integer
AQ_NAME
60 String
AQ_CODE
4 Integer
DESCRIPT
60 String
FGDLAQDATE
36 Date
AUTOID
4 Integer
SHAPE
4 Geometry
SHAPE.AREA
0 Double
SHAPE.LEN
0 Double

FEATURE ATTRIBUTE TABLES CODES AND VALUES:

Item

Item Description





OBJECTID

Internal feature number.
















ROCK_NAME

The name of the permeable geologic material that composes the aquifer.




Carbonate-rock aquifers = Formations composed of limestone and (or) dolomite.

Igneous and metamorphic-rock aquifers = Formations composed of volcanic rocks.

Sandstone and carbonate-rock aquifers = Formations composed of sandstone, limestone, and (or) dolomite.

Sandstone aquifers = Formations composed of sandstone.

Semiconsolidated sand aquifers = Formations partially solidified sand.

Unconsolidated sand and gravel aquifers = Formations composed of loose sand and gravel.

<blank> = Other rocks.  Rocks that are generally poorly permeable but locally
may contain productive aquifers.













ROCK_TYPE

The code number relating to the ROCK_NAME.




100 = Unconsolidated sand and gravel aquifers.

200 = Semiconsolidated sand aquifers.

300 = Sandstone aquifers.

400 = Carbonate-rock aquifers.

500 = Sandstone and carbonate-rock aquifers.

600 = Igneous and metamorphic-rock aquifers.

999 = Areas that are other rocks.













AQ_NAME

The aquifer unit name. (See Overview Description Below)
















AQ_CODE

The code number relating to the aquifer unit name.  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.  See table below in Overview Description under AQ_NAME.
















DESCRIPT

FGDL added field based on AQ_NAME
















FGDLAQDATE

FGDL added field based on date downloaded from source
















AUTOID

Unique ID added by GeoPlan
















SHAPE

Feature geometry.
















SHAPE.AREA

Area in meters
















SHAPE.LEN

Perimeter in meters






















Overview Description:

The names used in this map layer 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
>101 -- Basin and Range basin-fill 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 Sound aquifer system
>114 -- Puerto Rico south coast aquifer
>115 -- Willamette Lowland basin-fill aquifers
>116 -- Columbia Plateau basin-fill aquifers
>117 -- Snake River Plain basin-fill aquifers
>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 -- Marshall aquifer
>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
>419 -- Puerto Rico North Coast Limestone aquifer system
>420 -- Kingshill 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
>606 -- Snake River Plain basaltic-rock aquifers
>607 -- Columbia Plateau basaltic-rock aquifers
>608 -- Hawaiian Volcanic-rock aquifers
>609 -- Hawaiian Sedimentary deposit aquifers
>610 -- Pacific Northwest basaltic-rock aquifers
>611 -- Piedmont and Blue Ridge crystalline-rock aquifers
>999 -- Other rocks.  Rocks that are generally poorly permeable but locally may 
            contain productive aquifers.






USER NOTES:








Polygon and chain-node topology are present.  Each polygon is closed and has
one label point.













This map layer originally included aquifer information for the 48 conterminous United
States, the District of Columbia, Hawaii, Puerto Rico, and the U.S. Virgin
Islands. It was clipped to include only Florida.













GeoPlan relied on the integrity of the attribute information within
the original data.













A formation, group of formations, or part of a formation that contains
sufficient saturated permeable material to yield significant quantities
of water to wells and springs.

The Ground Water Atlas of the United States (GWA) chapters include
additional information that may be relevant to the use of this map layer,
such as maps of alluvial and glacial aquifers that overlie the aquifers in
this map layer, as well as other information described below.

The areal extent of the aquifers, as shown in this map layer, 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 map layer 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 map layer.  Major alluvial aquifers
that occur along main watercourses are not shown.  Significant
unconsolidated sand and gravel aquifers, that are not indicated in this
map layer but are important sources of water, may occur locally in
glaciated regions.  The user of this map layer 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 map layer 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 map layer.  The data were reviewed, adjusted,
and published based on new information provided by national, State, and
local scientists.  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,
ogw_webmaster@usgs.gov.

This map layer 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 map layer 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, Washington
>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 Jersey, North
>                           Carolina, Pennsylvania, Virginia, West
>                           Virginia
>HA 730-M        Segment 12-Connecticut, Maine, Massachusetts, New
>                           Hampshire, New York, Rhode Island, Vermont
>HA 730-N        Segment 13-Alaska, Hawaii, Puerto Rico, and the U.S.
>                           Virgin Islands
Refer to <http://capp.water.usgs.gov/gwa/gwa.html> for a graphic depiction
of the GWA chapter regions, as well as more information about the GWA.

It may be helpful to refer to the printed GWA chapters when using the
Data, however, there are significant differences between this national
map layer and the printed chapters.  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.

The following listings show the differences between aquifer names in the
GWA chapters and the AQ_NAME and AQ_CODE used in this map layer.  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
>
>Confining unit                999-Other rocks
>
>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-Other rocks
>
>
>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-Other rocks
>
>Mississippi embayment         109-Mississippi River Valley
>aquifer system                    alluvial aquifer
>                              203-Mississippi embayment
>                                  aquifer system
>                              204-Southeastern Coastal
>                                  Plain aquifer system
>                              999-Other rocks
>
>Tokio-Woodbine aquifer        999-Other rocks
>
>Ouachita Mountains aquifer    999-Other rocks
>
>CONFINING SYSTEMS AND CONFINING UNITS
>Western Interior Plains       999-Other rocks
>confining systems
>
>Confining unit                109-Mississippi River Valley
>                                  alluvial aquifer
>                              203-Mississippi embayment
>                                  aquifer system
>                              999-Other rocks
>
>
>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       611-Piedmont and Blue Ridge
>aquifers                          crystalline-rock aquifers
>
>Appalachian Plateaus          310-Pennsylvanian aquifers
>aquifers
>
>Interior Low Plateaus         503-Mississippian aquifers
>aquifers
>
>Confining unit                999-Other rocks
>
>
>GWA chapter HA 730-H
>Name from fig 5, page H4      AQ_CODE-AQ_NAME
>____________________________________________________________
>Unconsolidated-deposit        101-Basin and Range basin-fill
> aquifers                         aquifers
>                              104-Pacific Northwest
>                                  basin-fill aquifers
>                              105-Northern Rocky Mountains
>                                  Intermontane Basins
>                                  aquifer system
>                              112-Puget Sound aquifer system
>
>
>Pliocene and younger          606-Snake River Plain
>basaltic-rock aquifers            basaltic-rock aquifers
>                              610-Pacific Northwest
>                                  basaltic-rock aquifers
>
>Miocene basaltic-rock         606-Snake River Plain
>aquifers                          basaltic-rock aquifers
>                              607-Columbia Plateau basaltic-rock
>                                  aquifers
>                              610-Pacific Northwest
>                                  basaltic-rock aquifers
>
>Aquifers in pre-Miocene       401-Basin and Range
>rocks                             carbonate-rock aquifers
>                              999-Other rocks
>
>
>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       610-Pacific Northwest
>sedimentary rock aquifers         basaltic-rock aquifers
>
>Upper Tertiary aquifers       105-Northern Rocky Mountains
>                                  Intermontane Basins
>                                  aquifer system
>                              107-High Plains aquifer
>                              314-Lower Tertiary aquifers
>                              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 aquifers
>
>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-Marshall aquifer
>
>Crystalline-rock aquifer      999-Other rocks
>
>Confining unit                312-Cambrian-Ordovician
>                                  aquifer system
>                              999-Other rocks
>
>
>GWA chapter HA 730-K
>Name from fig 5, page K4      AQ_CODE-AQ_NAME
>____________________________________________________________
>Blue Ridge aquifers           611-Piedmont and Blue Ridge
>                                  crystalline-rock aquifers
>
>MISSISSIPPI EMBAYMENT AQUIFER SYSTEM
>Upper Claiborne, middle       109-Mississippi River Valley
>Claiborne, middle Wilcox,         alluvial aquifer
>and lower Wilcox              203-Mississippi embayment
>                                  aquifer system
>
>McNairy-Nacatoch              204-Southeastern Coastal
>                                  Plain aquifer system
>
>Pennsylvanian aquifers        999-Other rocks
>
>Confining unit                999-Other rocks
>
>
>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
>                              205-Northern Atlantic
>                                  Coastal Plain 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
>aquifer                           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     611-Piedmont and Blue Ridge
>                                  crystalline-rock aquifers
>
>Valley and Ridge              416-New York and New England
>carbonate-rock aquifers           carbonate-rock aquifers
>                              505-Valley and Ridge
>                                  carbonate-rock aquifers
>
>APPALACHIAN PLATEAUS
>Permian and Pennsylvanian     310-Pennsylvanian aquifers
>aquifers
>
>Not a principal aquifer       611-Piedmont and Blue Ridge
>                                  crystalline-rock aquifers
>
>
>GWA chapter HA 730-M
>Name from fig 10, page M5     AQ_CODE-AQ_NAME
>____________________________________________________________
>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-Other rocks
>
>
>GWA chapter HA 730-N
>Hawaii name from fig 35,
>page N14
>Puerto Rico name from
>fig 71, page N24              AQ_CODE-AQ_NAME
>____________________________________________________________
>Volcanic rock aquifers        608-Hawaiian Volcanic-rock
>                                  aquifers
>                              609-Hawaiian Sedimentary
>                                  deposit aquifers
>
>MINOR AQUIFERS
>Coastal embayment aquifers    999-Other rocks
>Volcaniclastic-, igneous-,
>and sedimentary-rock aquifers
>
>Confining unit                999-Other rocks
>
>NORTHCOAST LIMESTONE AQUIFER SYSTEM
>Upper aquifer                 419-Puerto Rico North Coast Limestone
>                                  aquifer system
>
>Lower aquifer                 419-Puerto Rico North Coast Limestone
>                                  aquifer system
>
Related Spatial and Tabular Data Sets

A map layer showing the areal extent of sand and gravel aquifers of
alluvial and glacial origin north of the line of Quaternary continental
glaciation is included in the online, interactive National Atlas of the
United States.  This map layer ends at the southern limit of
glaciation in the United States; areas north of the limit line contain
significant sand and gravel glacial deposits that are important sources of
water for local areas.

For additional information on principal aquifers, please see the Aquifer
Basics page at <http://capp.water.usgs.gov/aquiferBasics/index.html>.

The final data are being served to the public in the following formats:
Spatial Data Transfer Standard (SDTS), Arc/INFO Export, or ArcView
Shapefile.















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.















This data is provided 'as is' and its horizontal positional accuracy
has not been verified by GeoPlan















This data is provided 'as is' and its vertical positional accuracy
has not been verified by GeoPlan















THE DATA INCLUDED IN FGDL ARE 'AS IS' AND SHOULD NOT BE CONSTRUED
AS LEGALLY BINDING. THE UNIVERSITY OF FLORIDA GEOPLAN CENTER SHALL
NOT BE LIABLE FOR ANY DAMAGES SUFFERED AS A RESULT OF USING,
MODIFYING, CONTRIBUTING OR DISTRIBUTING THE MATERIALS.

A note about data scale: 

Scale is an important factor in data usage.  Certain scale datasets
are not suitable for some project, analysis, or modeling purposes.
Please be sure you are using the best available data. 

1:24000 scale datasets are recommended for projects that are at the
county level.
1:24000 data should NOT be used for high accuracy base mapping such
as property parcel boundaries.
1:100000 scale datasets are recommended for projects that are at the
multi-county or regional level.
1:125000 scale datasets are recommended for projects that are at the
regional or state level or larger.

Vector datasets with no defined scale or accuracy should be
considered suspect. Make sure you are familiar with your data
before using it for projects or analysis. Every effort has been
made to supply the user with data documentation. For additional
information, see the References section and the Data Source Contact
section of this documentation. For more information regarding
scale and accuracy, see our webpage at:
http://geoplan.ufl.edu/education.html








REFERENCES: 














DATA LINEAGE SUMMARY: 








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 Discipline 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.
Process Date: 1993


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 DLG's.  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 National Atlas was used to provide the coastline and two aquifer
boundaries that coincide with State lines.

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 map layer 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 map layer.

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.
Process Date: 1997


Aquifer data was taken from digital files created in Adobe Illustrator
for Ground Water Atlas chapter HA 730-N of Hawaii, Puerto Rico, and the
U.S. Virgin Islands.  Where polygons ended at the shoreline, National
Atlas State boundaries were used.  The final Illustrator file was
exported into a DXF file.  The DXF file was converted to a coverage.
Using the TRANSFORM command, the coverage containing the aquifer lines
was rubber-sheeted to the coverage containing registration tics, and was
then projected from geographic coordinates to Albers Equal-Area Conic
projection for verification purposes.  The aquifer coverage was cleaned,
the topology was built, and labels were added.  Attributes were added as
necessary.
Process Date: 2000


Aquifer data was taken from digital files created in Adobe Illustrator
for Ground Water Atlas chapter HA 730-N of Hawaii, Puerto Rico, and the
U.S. Virgin Islands.  Where polygons ended at the shoreline, National
Atlas State boundaries were used.  The final Illustrator file was
exported into a DXF file.  The DXF file was converted to a coverage.
Using the TRANSFORM command, the coverage containing the aquifer lines
was rubber-sheeted to the coverage containing registration tics, and was
then projected from geographic coordinates to Albers Equal-Area Conic
projection for verification purposes.  The aquifer coverage was cleaned,
the topology was built, and labels were added.  Attributes were added as
necessary.
Process Date: 2000


The Principal Aquifers map published in 1998 was reviewed and modified,
resulting in 57 aquifers, 36 of which were the same geographically as in
the 1998 publication.  Aquifers were aggregated, divided, renamed and
updated from more recent publications, using a variety of techniques,
which include scanning, importing unpublished digital data and paper
compilation at 1:2,500,000 scale.  The updated Adobe Illustrator aquifer
data was exported into a DXF file.  The DXF file was converted to a
coverage.  Using the TRANSFORM command, the coverage containing the
aquifer lines was rubber-sheeted to the coverage containing registration
tics, and was then projected from geographic coordinates to Albers
Equal-Area Conic projection for verification purposes.  The aquifer
coverage was cleaned, the topology was built, and labels were added.
Attributes were added as necessary.
Process Date: 2001


The Principal Aquifers coverages of Hawaii, Puerto Rico, and the U.S.
Virgin Islands were merged with the coverage of the conterminous United
States.  The coverage was read into ArcGIS and both a personal
geodatabase and a shapefile were created.
Process Date: 2003


This dataset  was downloaded by the GeoPlan Center from the National Atlas
website (http://www.nationalatlas.gov/atlasftp.html?openChapters=chpwater#chpwater) 
on 7/28/2008. When received the data set represented aquifers for the 48 Conterminous 
United States, Hawaii, Puerto Rico, and the U.S. Virgin Islands. The dataset was in the 
following projection: Albers NAD 83. The dataset was clipped to Florida and projected to 
Albers NAD 83 HARN.

- Added the field DESCRIPT based on AQ_NAME.
- Added the field FGDLAQDATE based on date downloaded from source.
- Added AUTOID field. AUTOID = FID + 1
- Upcased all text in the attribute table.
Process Date: 20080728


Data imported to ArcSDE and exported as a shapefile.
Process Date: 20080911









MAP PROJECTION PARAMETERS: 



Projection                          ALBERS
Datum                               HPGN
Units                               METERS
Spheroid                            GRS1980
1st Standard Parallel               24  0  0.000
2nd Standard Parallel               31 30  0.000
Central Meridian                   -84 00  0.000
Latitude of Projection's Origin     24  0  0.000
False Easting (meters)              400000.00000
False Northing (meters)             0.00000




DATA SOURCE CONTACT (S):








Name:
Abbr. Name:
Address:


Phone:

Web site:
E-mail:
Contact Person:
         Phone:
        E-mail:




U.S. Geological Survey
USGS
505 Science Drive
Madison, WI
53711
608-238-9333


http://www.nationalatlas.gov/atlasftp.html?openChapters=chpwater#chpwater

Chief, Cartographic and Publications Program, Water Resources Division









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