1:24,000-scale USGS quadrangles

Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Upper Midwest Environmental Sciences Center
Originator: U.S. Geological Survey
Publication_Date: 20030117
Title: 1:24,000-scale USGS quadrangles
Online_Linkage: http://www.umesc.usgs.gov/data_library/maps_quads_figs/quad_indexes.html
Description:
Abstract:
The 1:24,000-scale (24K) U.S. Geological Survey (USGS) quadrangle boundary data set contains the following information. (1) The approximate boundaries of the various 24K USGS quadrangles. (2) The names and indexing codes associated with each 24K quadrangle. And (3) information on which 1:100,000- (100K) and 1:250,000-scale (250K) quadrangle each 24K is associated with.
Purpose:
The data set was created to assist UMESC employees with locating the names and indexing information associated with each 24K 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. Furthermore, considering the size of the database, no attempt was made to densify (add locational detail) to the lines that define the boundaries of the quadrangles. Only the corner points are linked to specific coordinates on the earth's surface. Therefore, if these data are reprojected, instead of curving boundary lines that follow the projected surface, straight lines will be drawn between the corner coordinates. These data are stored in decimal degree coordinates, North American Datum 1927 (NAD27).
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: USGS
Theme_Keyword: quadrangle
Theme_Keyword: quad
Theme_Keyword: drg
Theme_Keyword: digital raster graphic
Place:
Place_Keyword_Thesaurus:
Place_Keyword: usa
Place_Keyword: Continental United States
Place_Keyword: United States
Access_Constraints: None
Use_Constraints:
Use at your own risk, quadrangle boundaries are approximate.
Point_of_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
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The names, states in which the quadrangles are located, and Grid60 information were all obtained from a quadrangle center point coverage provided by an individual who works for the USGS national mapping division. Background information on the 2- and 3-digit codes used to identify 250K- and 100K-quadrangles came from another USGS FTP server, several years later. These data were added to the 24K grid by linking the data sets together 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 quadrangle center point themes using ArcInfo's identify and linking functions. Only those polygons attributed by these themes were retained, all other cells in the fishnet were eliminated.
Completeness_Report:
Only those polygons which corresponded to quadrangles identified in the 24K quad center point coverage were retained. The boundaries of the 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. Also in an effort to reduce overall file size, the arc lines used to define the boundaries of the quadrangles were not densified (to add additional georeferencing points). Therefore if the data are reprojected, straight lines will be drawn between the quadrangle corner nodes instead of 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 7.5 minute quadrangles (i.e., 1/8th of a degree).
Process_Date: 1993
Process_Step:
Process_Description:
A central point coverage containing attribute information for USGS 7.5 minute quadrangles was used to attribute the fishnet.
Process_Date: 1993
Process_Step:
Process_Description:
Additional attribute information related to the 3 digit codes used by USGS to identify 100K quadrangles were added to the database from another dataset downloaded from the national mapping division.
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: .125
Longitude_Resolution: .125
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 250K scale quadrangle in which the 24K quadrangle is located.
Entity_Type_Definition_Source: USGS
Entity_Type:
Entity_Type_Label: code_250k
Entity_Type_Definition: The 2-digit code used to identify 250K quadrangles
Entity_Type_Definition_Source: USGS
Entity_Type:
Entity_Type_Label: name_100k
Entity_Type_Definition:
Names of the 100K scale quadrangle in which the 24K quadrangle is located.
Entity_Type_Definition_Source: USGS
Entity_Type:
Entity_Type_Label: state_100k
Entity_Type_Definition:
The state(s) the 100K quadrangle is associated with.
Entity_Type_Definition_Source: USGS
Entity_Type:
Entity_Type_Label: code_100k
Entity_Type_Definition:
The 3-digit code used to identify 100K quadrangles.
Entity_Type_Definition_Source: USGS
Entity_Type:
Entity_Type_Label: name_24k
Entity_Type_Definition: The name of each 24K quadrangle
Entity_Type_Definition_Source: USGS
Entity_Type:
Entity_Type_Label: state_24k
Entity_Type_Definition:
The state associated with the feature used to name each quadrangle. Note: database does not contain multiple state listings.
Entity_Type_Definition_Source: USGS
Entity_Type:
Entity_Type_Label: code_24k
Entity_Type_Definition:
The naming code used by USGS to identify individual 24K quadrangles. This was created by combining data stored in the original point theme's attribute table, it does not contain the initial theme type characters (e.g., o = official(?), p = proof).
Entity_Type_Definition_Source: UMESC
Entity_Type:
Entity_Type_Label: grid60
Entity_Type_Definition:
The latitude/longitude combination number used to identify quadrangle's location within either the east or west half of a 250K 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
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 09:51:17 2003