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1:250,000-scale USGS quadrangles

Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Upper Midwest Environmental Sciences Center
Originator: UMESC
Publication_Date: 20030117
Title: 1:250,000-scale USGS quadrangles
Online_Linkage: http://umesc.usgs.gov/data_library/maps_quads_figs/quad_indexes.html
Description:
Abstract:
The 1:250,000-scale (100K) U.S. Geological Survey (USGS) quadrangle boundary data set contains information on, (1) The approximate boundaries of the various 250K USGS quadrangles, and (2) the names and indexing codes associated with each 250K quadrangle.
Purpose:
The data set was created to assist with locating the names and indexing information associated with each 250K quadrangle and their approximate boundaries.
Supplemental_Information:
The quadrangle boundaries are approximate. Quadrangles associated with the outer U.S. boundaries (e.g., those along the shores of the Great Lakes, oceanic coasts, or the boarders with Canada and Mexico), may have been extended to include areas that were considered too small to create individual quadrangles for. No attempt was made to locate each of these odd sized quadrangles and accurately represent their boundaries in this data set.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20030117
Currentness_Reference: The publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Description_of_Geographic_Extent: Continental United States
Bounding_Coordinates:
West_Bounding_Coordinate: -125.7
East_Bounding_Coordinate: -66.1
North_Bounding_Coordinate: 49.8
South_Bounding_Coordinate: 24.2
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Quadrangle
Theme_Keyword: 1:25,000-scale quadrangle
Theme_Keyword: quad
Place:
Place_Keyword_Thesaurus:
Place_Keyword: United States
Place_Keyword: USA
Access_Constraints: None
Use_Constraints:
Use at your own risk, quadrangle boundaries are approximate.
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The names, states in which the quadrangles are located, and the 2-digit codes used to identify 250K-quadrangles came from a reference file located on a USGS FTP server. These data were added to a fishnet coverage created using the software program ArcInfo using ArcInfo commands.
Logical_Consistency_Report:
The polygon features were created using the ArcInfo Generate command, fishnet option. Most of the attribute information were added from a quadrangle reference coverage located on a USGS file server. Only those polygons which were attributed by this reference coverage were retained, all others eliminated.
Completeness_Report:
Only those polygons which corresponded to quadrangles identified in the 250K reference coverage were retained. The boundaries of coastline quadrangles (i.e., Great Lakes shorelines, ocean coasts, Canadian and Mexican boundaries) were not researched to determine which quadrangles had their boundaries extended to include land areas too small to map as individual quadrangles. Once identified, the data were then densified to add additional referencing points along the boundaries of the 100K quadrangles. This was done so if the data are reprojected, the boundary lines will be drawn as curved lines that follow the projection surface.
Lineage:
Process_Step:
Process_Description:
The software program ArcInfo was used to create a fishnet using the Generate command. The input coordinates were provided in decimal degrees, with the starting point defined as a whole number latitude and longitude value, with between degree intervals that corresponded to the boundaries of the 250K quadrangles. These data were then densified, to add additional referencing points along the quadrangle boundaries.
Process_Date: 1993
Process_Step:
Process_Description:
A reference cover containing the names of the individual 250K quadrangles and their 2-digit reference codes was used to attribute the fishnet. Any polygon that did not receive attributes was removed from the data set.
Process_Date: 2000
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Upper Midwest Environmental Sciences Center
Contact_Person: Spatial Analysis and Comptuer Technology Branch
Contact_Address:
Address_Type: mailing and physical address
Address: Upper Midwest Environmental Sciences Center
Address: 2630 Fanta Reed Road
City: La Crosse
State_or_Province: Wisconsin
Postal_Code: 54603-1223
Contact_Voice_Telephone: 608-783-6451
Contact_Voice_Telephone: 608-783-7550
Contact_Facsimile_Telephone: 608-783-8058
Hours_of_Service: 8:00 a.m. to 4:00 p.m. Monday Through Friday
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: .002
Longitude_Resolution: .002
Geographic_Coordinate_Units: Decimal degrees
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1927
Ellipsoid_Name: Clarke 1866
Semi-major_Axis: 6378206.4
Denominator_of_Flattening_Ratio: 294.978698
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: name_250k
Entity_Type_Definition: Names of the individual 250K quadrangles.
Entity_Type_Definition_Source: USGS
Entity_Type:
Entity_Type_Label: code_250k
Entity_Type_Definition: The 2-digit codes associated with each quadrangle.
Entity_Type_Definition_Source: USGS
Entity_Type:
Entity_Type_Label: utm_zone
Entity_Type_Definition:
The Universal Transverse Mercator (UTM) projection zone in which each quadrangle is located.
Entity_Type_Definition_Source: UMESC
Entity_Type:
Entity_Type_Label: two_colors
Entity_Type_Definition:
Used to shade the data set using two colors, to produce a checker board effect.
Entity_Type_Definition_Source: UMESC
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Upper Midwest Environmental Sciences Center
Contact_Person: Spatial Analysis and Comptuer Technology Branch
Contact_Address:
Address_Type: mailing and physical address
Address: Upper Midwest Environmental Sciences Center
Address: 2630 Fanta Reed Road
City: La Crosse
State_or_Province: Wisconsin
Postal_Code: 54603-1223
Contact_Voice_Telephone: 608-783-6451
Contact_Voice_Telephone: 608-783-7550
Contact_Facsimile_Telephone: 608-783-8058
Hours_of_Service: 8:00 a.m. to 4:00 p.m. Monday Through Friday
Distribution_Liability:
Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the accuracy or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data. It is strongly recommended that these data are directly acquired from a U.S. Geological Survey server, and not indirectly through other sources which may have changed the data in some way. It is also strongly recommended that careful attention be paid to the contents of the metadata file associated with these data. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and/or contained herein.
Metadata_Reference_Information:
Metadata_Date: 20030117
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Upper Midwest Environmental Sciences Center
Contact_Person: Spatial Analysis and Comptuer Technology Branch
Contact_Address:
Address_Type: mailing and physical address
Address: Upper Midwest Environmental Sciences Center
Address: 2630 Fanta Reed Road
City: La Crosse
State_or_Province: Wisconsin
Postal_Code: 54603-1223
Contact_Voice_Telephone: 608-783-6451
Contact_Voice_Telephone: 608-783-7550
Contact_Facsimile_Telephone: 608-783-8058
Hours_of_Service: 8:00 a.m. to 4:00 p.m. Monday Through Friday
Metadata_Standard_Name:
NBII Content Standard for National Biological Information Infrastructure Metadata
Metadata_Standard_Version: December 1995
Generated by mp on Fri Jan 31 09:07:33 2003