Structure contours of base of upper Arapahoe aquifer (arapbase) in "Structure, outcrop, and subcrop of the bedrock aquifers along the western margin of the Denver Basin, Colorado." Hydrologic Atlas 742

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: U.S. Geological Survey
Originator: Rafferty, Sharon A.
Publication_Date: 19980630
Title:
Structure contours of base of upper Arapahoe aquifer (arapbase) in "Structure, outcrop, and subcrop of the bedrock aquifers along the western margin of the Denver Basin, Colorado." Hydrologic Atlas 742
Edition: Version 1.0, July 22, 1998
Geospatial_Data_Presentation_Form: Downloadable GIS Data
Publication_Information:
Publisher: U.S. Geological Survey
Online_Linkage: http://pubs.usgs.gov/ds/2006/193/
Larger_Work_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 1998
Title:
Colorado Front Range Infrastructure Resources Project
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name: Hydrologic Investigations Atlas
Issue_Identification: HA-742
Publication_Information:
Publication_Place: Denver, Colorado
Publisher: U.S. Geological Survey
Online_Linkage: http://water.usgs.gov/GIS/metadata/usgswrd/XML/co_arapbase_ha742.xml
Description:
Abstract:
This digital geospatial data set consists of structure contours on the base of the upper member of the Arapahoe aquifer. The U.S. Geological Survey developed this data set as part of a project described in the report, "Structure, Outcrop, and Subcrop of the Bedrock Aquifers Along the Western Margin of the Denver Basin, Colorado" (Robson and others, 1998).
Purpose:
This data set was created to display the altitude
of the base of the upper Arapahoe aquifer
as depicted in Robson and others (1998).
Supplemental_Information:
Procedures_Used:
Structure contours of the base of the upper member of the
Arapahoe aquifer and tic marks were scanned from 1:50,000 maps
(Robson and others, 1998)at 200 to 800 dots per inch. These scans then
were saved into a TIFF (tagged image file format which is a bit-mapped
file format).  The TIFF's were converted to unrectified grids (ARC/INFO
raster geospatial datasets), by the ARC/INFO command IMAGEGRID.  Vector
geospatial data sets, known as coverages in ARC/INFO terminology, were
created from ascii files containing the latitude and longitude coordinates
in degrees, minutes and seconds.  These coverages were projected into a
State Plane projection that was specific to each county map. From these
coverages, link files were then created to help register the grids to the
coverages by use of the ARC/INFO command CONTROLPOINTS.

Arc: controlpoints fig2_grid fig2_lin fig2_tics nominal identity # point

Registration root mean square errors of 0.005 or less were acceptable for
the creation of link files.

The unrectified grids were georectified with the ARC/INFO command
GRIDWARP, which transforms or rubber sheets a grid along a set of links
by using a first-order polynomial transformation.  The grid-cell size
was resampled to a larger cell size to decrease processing time for
conversion to vector format coverages.

GRID:  setcell 20
GRID:  fig2_20grid = fig2_rgrid
Line coverages were created from the georectified grids with the ARC/INFO
command GRIDLINE, using a line thickness of 150 feet, a weed tolerance
of 40 feet, and a default dangle of 0.7 times the thickness.

GRID: fig2_cov = gridline (fig2_20grid,positive,thin,nofilter,
round,noitem,150, #,40)

The coverages then were built with line topology and attributed.
To improve cartographic display, arcs
were smoothed by splining and generalizing in Arcedit with weed
tolerances ranging from 30 to 100 units.
Individual coverages containing the same thematic data  were plotted
and checked for line accuracy and attribution. The individual coverages
were then appended to form a single thematic coverage.

The final coverage represents one thematic layer in
maps in Robson and others (1998).

This data set is one of seven digital map data sets being published
for this area.  The other six data sets are:

LFHTOP    -  structure contours on top of Laramie-Fox Hills aquifer
LFHBASE   -  structure contours on base of Laramie-Fox Hills
and Arapahoe aquifers
WELLS     -  location of wells
GEOSYMB   -   point and line geologic structure information
GEO       -  geohydrologic unit boundaries
STUDYAREA -  outline of study area

The following is an AML to generate a graphic of this coverage.

map arapbase.map
mape studyarea
pagesize 37 51
mappos cen cen
clearsel
box 1.0 1.0 35 49.5
arcs studyarea
/*PRINTING TEXT AND DASHED CONTOURS OF TOP
linesymbol 214
linetype hardware
linesize .01
linecolor red
lineput 214
textcolor red
resel arapbase arcs length gt 1191
arctext arapbase contnum # line blank
clearsel
resel arapbase arcs length lt 1191
arcs arapbase

Reviews_Applied_to_Data:

March 1998:  Colleague review of 1:50,000-scale maps that
were generated from the original data set.  Manuscript review
included validation of method as outlined in map report and
inspection for positional accuracy.

March 1998:  Inspection of copy generated from this data set.

April 1998:  Colleague review of original digital data set
and associated metadata.  Metadata review included verification
of table and column/item identities and definitions, validation
of the reference data sets and citations, verification of
consistency between log file and documented procedures, and
validation of development method as described in the documentation.

References_Cited:

Robson,S.G., Van Slyke, George, and Graham, Glenn, 1998,
Structure, outcrop, and subcrop of the
bedrock aquifers along the western margin of the Denver
Basin, Colorado:  U.S. Geological Survey Hydrologic
Investigations Atlas HA-742, 5 sheets, scale 1:50,000.
Available through the internet at
http://rockyweb.cr.usgs.gov/frontrange/
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1998
Currentness_Reference:
Current as of publication date.
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned.
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -105.22675297
East_Bounding_Coordinate: -105.1413434
North_Bounding_Coordinate: 39.91838553
South_Bounding_Coordinate: 39.83151222
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: structure contour
Theme_Keyword: aquifer
Theme_Keyword: inlandWaters
Theme_Keyword: Front Range Infrastructure Resources
Theme:
Theme_Keyword_Thesaurus: ArcIMS Metadata Server Theme Codes
Theme_Keyword: geoscientificInformation
Theme_Keyword: environment
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Front Range, Colorado
Place_Keyword: Denver, Colorado
Place_Keyword: Front Range of Colorado
Place_Keyword: Colorado
Place_Keyword: Denver Basin
Place_Keyword: CO
Place_Keyword: Front Range
Place_Keyword: U.S.
Access_Constraints: None
Use_Constraints:
These data are not to be used at scales greater than 1:50,000.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey, Water Resources Division
Contact_Person: Colorado District Chief
Contact_Address:
Address_Type: mailing address
Address:
Box 25046, MS 415, Denver Federal Center
City: Denver
State_or_Province: CO
Postal_Code: 80225
Country: USA
Contact_Voice_Telephone: 1-888-275-8747
Contact_Facsimile_Telephone: 303-236-4912
Contact_Electronic_Mail_Address: wfhorak@usgs.gov
Browse_Graphic:
Browse_Graphic_File_Name: http://certmapper.cr.usgs.gov/data/frip/graphic/arapbase.jpg
Browse_Graphic_File_Type: JPEG
Data_Set_Credit:
U.S. Geological Survey
Native_Data_Set_Environment:
dgux, 5.4R3.10, AViiON UNIX ARC/INFO version 7.0.4
Back to Top
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Procedures used to develop contours are described
in Hydrologic Atlas-742
Logical_Consistency_Report:
Chain-node topology present.
Completeness_Report:
See supplemental information.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Scanned lines and data points are within 0.01 inch of
original linework.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey (comp)
Publication_Date: 1998
Title:
Structure, outcrop, and subcrop of the bedrock aquifers along the western margin of the Denver Basin, Colorado.
Geospatial_Data_Presentation_Form: Map
Series_Information:
Series_Name: Hydrologic Investigations Atlas
Issue_Identification: HA-742
Publication_Information:
Publication_Place: Denver, CO
Publisher: USGS, WRD
Type_of_Source_Media: mylar separate
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1997
Source_Currentness_Reference:
publication date
Source_Citation_Abbreviation:
HA-742
Source_Contribution:
Structure contours were hand drawn.  Please see
Robson and others (1998).
Process_Step:
Process_Description:
See Supplemental Information
Process_Date: 1998
Back to Top
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: String
Point_and_Vector_Object_Count: 22
Back to Top
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 13
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: implied
Longitude_of_Central_Meridian: implied
Latitude_of_Projection_Origin: implied
False_Easting: implied
False_Northing: implied
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 4.191082963978
Ordinate_Resolution: 4.191082963978
Planar_Distance_Units: Meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: GRS1980
Semi-major_Axis: 6378206.4
Denominator_of_Flattening_Ratio: 294.98
Back to Top
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: arapbase.AAT
Entity_Type_Definition:
Attribute table of arapbase
Entity_Type_Definition_Source:
GIS software
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:
n/a
Enumerated_Domain_Value_Definition_Source:
GIS software
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:
n/a
Enumerated_Domain_Value_Definition_Source:
GIS software
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:
n/a
Enumerated_Domain_Value_Definition_Source:
GIS software
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:
n/a
Enumerated_Domain_Value_Definition_Source:
GIS software
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:
n/a
Enumerated_Domain_Value_Definition_Source:
User assigned
Attribute:
Attribute_Label: arapbase#
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:
n/a
Enumerated_Domain_Value_Definition_Source:
User assigned
Attribute:
Attribute_Label: arapbase-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:
n/a
Enumerated_Domain_Value_Definition_Source:
GIS software
Attribute:
Attribute_Label: DASHED
Attribute_Definition:
Contour line sections inferred or interpolated
Attribute_Definition_Source:
User-defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: "y", "n"
Enumerated_Domain_Value_Definition:
y for yes, inferred
n for no, not inferred
Enumerated_Domain_Value_Definition_Source:
User assigned
Attribute:
Attribute_Label: CONTNUM
Attribute_Definition:
Altitude of the base of the Arapahoe aquifer above sea level.
Attribute_Definition_Source:
see, (Robson and others, 1998)
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 100 foot intervals
Enumerated_Domain_Value_Definition:
n/a
Enumerated_Domain_Value_Definition_Source:
User assigned
Overview_Description:
Entity_and_Attribute_Overview:
>
>arapbase.AAT:
>
Item DASHED is a graphical indicator to represent whether
data displayed was known or inferred.
y = display line as dashed (inferred)
n = display line as solid (known).

Item CONTNUM indicates number of feet above sea level of
base of aquifer.
>
>arapbase.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  arapbase#                4     5     B      -
>   29  arapbase-ID              4     5     B      -
>   33  DASHED                 2     2     C      -
>   35  CONTNUM                5     5     I      -
>
>
Entity_and_Attribute_Detail_Citation:
Not available
Back to Top
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Position: Ask USGS - Water Webserver Team
Contact_Address:
Address_Type: mailing
Address:
507 National Center
City: Reston
State_or_Province: VA
Postal_Code: 20192
Contact_Voice_Telephone: 1-888-275-8747 (1-888-ASK-USGS)
Contact_Electronic_Mail_Address: http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+co_arapbase_ha742
Resource_Description: Downloadable Data
Distribution_Liability:
Although this data set has 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 and related materials. 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, software, or 
related materials.

Any use of trade, product, or firm names is for descriptive
purposes only and does not imply endorsement by the U.S.
Government.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ArcInfo Export File
Format_Information_Content:
Structure contours of base of upper Arapahoe aquifer geographic features
Transfer_Size: 300 KB
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: http://certmapper.cr.usgs.gov/data/frip/spatial/export/arapbasee.zip
Digital_Form:
Digital_Transfer_Information:
Format_Name: Shapefile
Format_Information_Content:
Structure contours of base of upper Arapahoe aquifer geographic features
Transfer_Size: 300 KB
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: http://certmapper.cr.usgs.gov/data/frip/spatial/shape/arapbase.zip
Digital_Form:
Digital_Transfer_Information:
Format_Name: Image Map Service (CO_FrontRange)
Format_Version_Number: 9.0
Format_Specification:
ArcIMS Image Map Service
Format_Information_Content:
A web-based interactive mapping system that accesses an ArcIMS Map Service running on certmapper.cr.usgs.gov.
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: http://certmapper.cr.usgs.gov/pubs/servlet/MapViewerBroker?project=frip&Service=CO_FrontRange&OVMap=CO_overview
Access_Instructions:
This URL links to a web-based interactive mapping system that accesses an ArcIMS Image Map Service that runs in Netscape 4.7, Internet Explorer 4.5 and higher. The mapservice can also be accessed using any custom client that adheres to the protocol specified through ArcXML.
Digital_Form:
Digital_Transfer_Information:
Format_Name: Export
Format_Information_Content:
Full coverage
File_Decompression_Technique: zipped
Transfer_Size: 1
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: http://water.usgs.gov/GIS/dsdl/arapbase.e00.gz
Digital_Form:
Digital_Transfer_Information:
Format_Name: Other
Format_Information_Content:
Full coverage
File_Decompression_Technique: zipped
Transfer_Size: 1
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: http://water.usgs.gov/GIS/dsdl/arapbase.tgz
Digital_Form:
Digital_Transfer_Information:
Format_Name: shapefile
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: http://certmapper.cr.usgs.gov/data/frip/spatial/shape/arapbase.zip
Fees: None. This dataset is provided by USGS as a public service.
Back to Top
Metadata_Reference_Information:
Metadata_Date: 20041108
Metadata_Review_Date: 20050310
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Position: Ask USGS -- Water Webserver Team
Contact_Address:
Address_Type: mailing
Address:
507 National Center
City: Reston
State_or_Province: VA
Postal_Code: 20192
Contact_Voice_Telephone: 1-888-275-8747 (1-888-ASK-USGS)
Contact_Electronic_Mail_Address: http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+co_arapbase_ha742
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Back to Top