The ARC/INFO COUNTY100 polygon data set was extracted from the 100,000-scale
state boundary ARC/INFO COUNTY100 issued by the USGS/WRD.
Citation_Information:
Originator: Scientific Assessment and Strategy Team (SAST)
Publication_Date: 19950501
Title: COUNTY100 ARC/INFO COVERAGE
Geospatial_Data_Presentation_Form: map
Online_Linkage: http://edcwww.cr.usgs.gov/sast-home.html
Description:
The SAST ARC/INFO database is a comprehensive vector basemap of the Upper
Mississippi/Missouri River Basin and contains attribute data suitable for
performing a wide range of analyses and for generating thematic maps for
counties and states throughout the flood area.
Abstract:
On January 10, 1994, the Scientific Assessment and Strategy Team (SAST)
joined in the effort to provide scientific advice and assistance to
officials responsible for making decisions with respect to the flood
recovery in the Upper Mississippi River Basin.
The 1:100,000-scale county boundaries for the Upper Mississippi/Missouri
River Basin were extracted from the ARC/INFO data model supplied by the
USGS/WRD.
Purpose:
The SAST utilizes the data in the Geographic Information System ARC/INFO
data model for several reasons. ARC/INFO organizes geographic data using
a relational and topological model. This facilitates efficient handling
of the two generic classes of spatial data: Locational data describing the
location and topology of point, line, and area features; and attribute
data describing the characteristics of these features.
Spatial_Domain:
Bounding_Coordinates: Geographic coordinates (latitude/longitude) in
decimal degrees.
West_Bounding_Coordinate: 36.0 -111.0
East_Bounding_Coordinate: 36.5 -86.5
South_Bounding_Coordinate: 48.5 -84.0
North_Bounding_Coordinate: 49.5 -114.0
Keywords:
Theme:
Theme_Keyword_Thesaurus: None.
Theme_Keyword: USGS/WRD
Theme_Keyword: county
Theme_Keyword: polygon
Theme_Keyword: boundaries
Theme_Keyword: Coverage
Theme_Keyword: ARC/INFO
Theme_Keyword: Fuzzy Tolerance
Theme_Keyword: Arc
Theme_Keyword: attribute
Theme_Keyword: ARCPLOT
Theme_Keyword: Topology
Place:
Place_Keyword_Thesaurus: None
U.S. Department of Commerce, 1987, Codes for the identification of
the tates, the District of Columbia and the outlying areas of The
United States, and associated areas (Federal Information Processing
Standard 5-2):Washington ,D. C., National Institute of Standards and
Technology.
Place_Keyword: US
Place_Keyword: Upper Mississippi/Missouri river basin
Access_Constraints: None
Use_Constraints: None
Acknowledgement of the U.S. Geological Survey and the Scientific
Assessment and Strategy Team would be appreciated in products derived
from these data.
Contact_Information:
Point_of_Contact: Jacqueline Klaver
Contact_Position: Senior Scientist
Contact_Address:
Address_Type:
Address: SAST
U.S. Geological Survey
EROS Data Center
City: Sioux Falls
State: SD
Postal_Code: 57198
Country: USA
Contact_Voice_Telephone: 605 594 6961
Contact_Facsimile_Telephone: 605 594 6589
Contact_Electronic_Mail: jklaver@edcserver1.cr.usgs.gov
Hours_of_Service: 0730-1615
Data_Set_Credit:
Scientific Assessment and Strategy Team
U.S. Geological Survey
Native_Data_Set_Environment:
UNIX ARC/INFO
Cross_Reference:
Upper Mississippi/Missouri River Basin ARC/INFO coverages in the Scientific
Assessment and Strategy Team (SAST) database.
During ARC/INFO coverage development several modifications were made to the
source data in order to generate a database with a common scale, uniform level
of resolution, consistent coding scheme, and comparable (standardized)
measurement data.
Attribute_Accuracy:
Attribute accuracy is estimated to be 98.5 percent. A check for illogical
attribute combinations were performed both interactively and via batch
procedures.
Attribute_Accuracy_Report:
Visual tests involved the review of check plots. The check plots were
matched against the USGS 1:100,000-scale national map series.
Attribute_Accuracy_Value:
The accuracy of most attributes has not been explicitly tested against
independent sources.
Attribute_Accuracy_Explanation:
Code attributes were reviewed by checking for invalid codes in the
database using the ARC/INFO CODEFIND command. Invalid code combinations
were checked using the ARC/INFO CONSIST command (codes were deemed
invalid if they were undefined in the FIPS State code.
CODEFIND identifies coding errors for item values in an INFO data
file.
CONSIST identifies illogical code combinations for multiple items
in an INFO data file. Item values are compared against a
series of user-specified conditions to identify illogical
code combinations.
Logical_Consistency_Report:
All data were found to be topologically correct. No duplicate features are
present. All lines intersect where intended. No undershoots or overshoots
are present.
The tests of logical consistency were performed by the ARC commands:
BUILD creates or updates a feature attribute table for a
coverage. It defines polygon topology when the POLY
option is used.
CLEAN generates a coverage with correct polygon topology.
It edits and corrects geometric coordinate errors, and
creates feature attribute information for each polygon
(i.e., creates a PAT).
CLIP creates a new coverage by overlaying two sets of
features, which are the arcs.
DISSOLVE eliminates arcs between adjacent polygons containing
equal values.
LABELERRORS lists all polygons which have either no label points
or more than one label point.
Completeness_Report:
Data completeness reflects the content of the source USGS/WRD ARC/INFO data
model. Features may have been eliminated or generalized on the source
graphic, due to scale and legibility constraints.
Positional_Accuracy:
The positional accuracy of the SAST ARC/INFO database is consistent with the
original USGS/WRD ARC/INFO county boundaries database.
Horizontal_Positional_Accuracy_Report:
The accuracy of the database components that originated in the USGS/WRD
transfer format can be inferred to have the cumulative effects of
data processing performed by the Scientific Assessment and Strategy Team
(SAST).
Horizontal_Positional_Accuracy_Value:
The conservative estimate on the accuracy of the ARC/INFO 1:100,000-scale
county boundaries is 0.01 inch.
Horizontal_Positional_Accuracy_Explanation:
Horizontal positional accuracy is based upon the use of the boundaries
of areas such as census counties and countys from cartographic
100,000-scale maps. Positional accuracy between the USGS/WRD ARC data
and the SAST ARC data files are within a 0.01 inches tolerance. Features
with like dimensionality, and with or without like attribution, that are
within the tolerance are adjusted by moving the feature equally in both
the data set and coverage. Features outside the tolerance are not moved.
Lineage:
Data derived primarily from the 1:100,000-scale USGS/WRD ARC/INFO data.
Source_Information:
The ARC/INFO coverage was derived primarily from 1:100,000-scale ARC/INFO
interchange export file supplied by the USGS/WRD.
Source_Citation:
USGS/WRD ARC/INFO export interchange files for the 1:100,000-scale county
boundaries.
Type_of_Source_Media: Unknown
SAST Upper Mississippi/Missouri River Basin database ARC/INFO coverages.
Source_Scale_Denominator: 100,000
Type_of_Source_Media: Unknown
Process_Step:
The SAST received the ARC/INFO polygon coverage of the county boundaries in
the ARC Export interchange file COUNTY100.e00.
Process_Description:
The ARC/INFO interchange file is used to transport coverages, INFO data
files, and other ARC/INFO files between various machine types. The
interchange file contained all the coverage information and appropriate
INFO data file information in a fixed length ASCII format.
The IMPORT command in ARC/INFO, with the option COVER, was used to read
the export file and to recreate the coverage along with its associated
INFO data files.
The ARC commands BUILD and CLEAN were used to recreate coverage topology.
BUILD creates or updates a feature attribute table for a
polygon coverage (.PAT). It defines polygon topology
when the POLY option is used.
CLEAN generates a coverage with correct polygon topology.
It edits and corrects geometric coordinate errors, and
and creates feature attribute information for each
polygon (i.e., creates an PAT).
Prior to creating each ARC coverage the SAST established the map
projection and coordinate system as used to record x,y locations and
coordinates for their geographic data base.
The output projection, Albers, was defined in the .PRJ file using the
PROJECT command in ARC. In ARC the coordinate precision is determined
by the current processing rule as set by the PRECISION command. The
ARC/INFO coverage COUNTY100 used the processing rule DOUBLE.
Source_Used_Citation_Abbreviation:
The 1:100,000-scale USGS/WRD county boundaries.
Process_Date:
In 1994 the 100K polygon coverage, COUNTY100, was imported into the SAST
database.
Process_Contact:
Contact_Information:
Point_of_Contact: Jacqueline Klaver
Contact_Position: Senior Scientist
Contact_Address:
Address_Type:
Address: SAST
U.S. Geological Survey
EROS Data Center
City: Sioux Falls
State: SD
Postal_Code: 57198
Country: USA
Contact_Voice_Telephone: 605 594 6961
Contact_Facsimile_Telephone: 605 594 6589
Contact_Electronic_Mail: jklaver@edcserver1.cr.usgs.gov
The Upper Mississippi/Missouri river basin represented in the ARC/INFO coverage
1:100,000-scale COUNTY100.
Indirect_Spatial_Reference:
Digital line data represented by arcs in ARC/INFO that depict the county
boundaries of 1:100,000 topographic data and attributes or codes as naming
and pointers for referencing.
Direct_Spatial_Reference_Method:
Point and Vector
Point/Vector_Object_Information:
Number of Points: 817
Number of lines: 22958
Number of line segments: 276608
Number of Polygons: 818
Point_Object_Information:
Number of control points: 4
SDTS_Terms_Description:
An area is a generic term for bounded, continuous, two-dimensional object
that may or may not include its boundary.
Distributor: SAST
Contact_Information:
Contact_Person: Jacqueline Klaver
Contact_Position: Senior Scientist
Contact_Address:
Address_Type:
Address: SAST
U.S. Geological Survey
EROS Data Center
City: Sioux Falls
State: SD
Postal_Code: 57198
Country: USA
Contact_Voice_Telephone: 605 594 6961
Contact_Facsimile_Telephone: 605 594 6589
Contact_Electronic_Mail: jklaver@edcserver1.cr.usgs.gov
Hours_of_Service: 0730-1615
Resource_Description:
Scientific Assessment and Strategy Team (SAST) Upper Mississippi River
Basin ARC/INFO USGS 1:100,000-scale County boundaries.
Distribution_Liability:
Although these data have been processed successfully on a computer
system at the EROS Data Center, no warranty expressed or implied is made
by the SAST or USGS regarding the utility of the data on any other
system, nor shall the act of distribution constitute any such warranty.
The Geological Survey will warrant the delivery of this product in
computer-readable format, and will offer appropriate adjustment of
credit when the product is determined unreadable by correctly adjusted
computer input peripherals, or when the physical medium is delivered in
damaged condition. Requests for adjustment of credit must be made
within 90 days from the date of this shipment from the ordering site.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ARCE (ARC Export)
Format_Version_Number: ARC6.1
Format_Version_Date:
Format_Specification: Polygon coverage data set or layer
Format_Information_Content: 1:100,000-scale County Boundaries
File_Decompression_Technique: ARC6.1 import (compressed)
Transfer_Size:
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
ftp edcftp.cr.usgs.gov
Enter "anonymous" at name prompt
Enter complete e-mail address at the Password prompt
cd (change) pub/data/sast (subdirectory)
Type: binary (set the file transfer mode to binary)
Type: get (to download one file) or
Type: mget (to download more than one file)
Digital_Transfer_Information:
Format_Name: PC ARC (Export)
Format_Version_Number: ARC6.1
Format_Version_Date:
Format_Specification: Polygon coverage data set or layer
Format_Information_Content: 1:100,000-scale County Boundaries
File_Decompression_Technique: ARC6.1 import (uncompressed)
Transfer_Size:
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
ftp edcftp.cr.usgs.gov
Enter "anonymous" at name prompt
Enter complete e-mail address at the Password prompt
cd (change) pub/data/sast (subdirectory)
Type: binary (set the file transfer mode to binary)
Type: get (to download one file) or
Type: mget (to download more than one file)
Digital_Transfer_Information:
Format_Name: SDTS
Format_Version_Number:
Format_Version_Date:
Format_Specification: Area coverage data set or layer
Format_Information_Content: 1:100,000-scale County Boundaries
File_Decompression_Technique:
Transfer_Size:
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
ftp edcftp.cr.usgs.gov
Enter "anonymous" at name prompt
Enter complete e-mail address at the Password prompt
cd (change) pub/data/sast (subdirectory)
Type: binary (set the file transfer mode to binary)
Type: get (to download one file) or
Type: mget (to download more than one file)
Digital_Transfer_Option:
Offline_Option:
Offline_Media: CD-ROM
Recording_Format: ISO 9660
Compatibility_Information:
This CD-ROM can be used with all computer operating systems that
support CD-ROM as a logical storage device. All text files on
the disc are in ASCII format. Data files are in ASCII or binary
format.
Fees:
CD-ROM = $70
Ordering_Instructions:
Point_of Contact: Ron Risty
Contact_Position: Senior Information Scientist
Contact_Address:
Address_Type:
Address: U.S. Geological Survey
EROS Data Center
City: Sioux Falls
State: SD
Country: USA
Contact_Voice_Telephone: 605 594 6969
Contact_Facsimile_Telephone: 605 594 6589
Contact_Electronic_Mail: risty@edcserver1.cr.usgs.gov
Hours_of_ Service: 7:30am - 4:15pm
Turnaround:
One week maximum
Metadata_Date: 19961023
Metadata_Contact_Information:
Metadata_Contact_Person: Mary C. Weinheimer
Metadata_Contact_Position: Information Scientist
Contact_Address:
Address_Type: mailing address
Address: U. S. Geological Survey
EROS Data Center
City: Sioux Falls
State_or_Province: South Dakota
Postal_Code: 57198
Country: USA
Contact_Voice_Telephone: 1 605 594 6097
Contact_Facsimile_Telephone: 605 594 6589
Contact_Internet_Address: weinheim@edcserver1.cr.usgs.gov
Hours_of_Service: 0730-1615
Metadata_Standard_Name: Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: 1.0
USGS Node of SAST Clearinghouse home page
