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Oregon / Washington

GIS Metadata

BLM OR Quads 1:63,360 (30-Minute) Polygon
FGDC Metadata
Show Definitions
Description | Spatial | Data Structure | Data Quality | Data Source | Data Distribution | Metadata
Information used to reference the data.
Title: BLM OR Quads 1:63,360 (30-Minute) Polygon
Originators: BLM and USGS
Publication date: 20020101
Data type: vector digital data
Other citation details:
A characterization of the data, including its intended use and limitations.
QUADS30M_POLY: This theme shows the 1:63,360 quadrangles (30 Minute Quads) for Oregon and Washington as defined in North American Datum 1927 (NAD27). These quads show the approximate extent of and align with the NAD27 corner ticks as displayed on USGS Topoquads.
Resource Management Planning
Supplemental information:
BLM (Bureau of Land Management), USGS (United States Geological Survey), GNIS (Geographical Names Information System), NGNDB (National Geographic Names DataBase) As described in the process steps these data were created on a regular grid of latitude/longitude to depict the 1:63,360 quadrangles covering Oregon and Washington and the surrounding areas as defined in North American Datum 1927 (NAD27). Due to the fact the dataset was originally created in NAD27 the values of coordinates defining the corners of the quads will only be those of the definition in the original datum. Once data is projected to a different datum the values will be correctly modified mathematically to reflect the change to the new projection. These quads show the approximate extent of the USGS topographic quadrangles. Since this data is constructed from corner points with straight lines connecting the corners, it does not take into account the curve between corner points introduced by the use of the UTM projection used to produce the topoquad maps. Thus this dataset is only a depiction of the extent of the topoquad. The corners of each of these quadrangles should align with the NAD27 ticks displayed on USGS topoquads in any projection used.
Point Of Contact
Contact information for the individual or organization that is knowledgeable about the data.
Organization: Bureau of Land Management
Person: Corey Plank
Position: Lead Cartographer
Phone: (503) 808-6427
Email: cplank@blm.gov
Address type: mailing
P.O. Box 2965
City: Portland
State or Province: OR
Postal code: 97201
County: US
Data Type
How the data are represented, formatted and maintained by the data producing organization.
Data type: vector digital data
Native dataset environment: Arc/Info, AIX/UNIX --------------------------------------------------------------------------------
Time Period of Data
Time period(s) for which the data corresponds to the currentness reference.
Date: 20020101 Time: unknown
Currentness reference:
publication date
The state of and maintenance information for the data.
Data status: Complete
Update frequency: Unknown
Key Words
Words or phrases that summarize certain aspects of the data.
Keywords: Lands, index, Framework, Base Data, Quadrangles
Keyword thesaurus: None
Keywords: imageryBaseMapsEarthCover
Keyword thesaurus: ISO 19115
Keywords: Management
Keyword thesaurus: BLM
Keywords: Washington, Oregon
Keyword thesaurus: BLM-State
Data Access Constraints
Restrictions and legal prerequisites for accessing or using the data after access is granted.
Access constraints:
PUBLIC DATA: None, these data are considered public domain.
Use constraints:
These data are provided by Bureau of Land Management (BLM) "as is" and may contain errors or omissions. The User assumes the entire risk associated with its use of these data and bears all responsibility in determining whether these data are fit for the User's intended use. The information contained in these data is dynamic and may change over time. The data are not better than the original sources from which they were derived, and both scale and accuracy may vary across the data set. These data may not have the accuracy, resolution, completeness, timeliness, or other characteristics appropriate for applications that potential users of the data may contemplate. The User is encouraged to carefully consider the content of the metadata file associated with these data. These data are neither legal documents nor land surveys, and must not be used as such. Official records may be referenced at most BLM offices. Please report any errors in the data to the BLM office from which it was obtained. The BLM should be cited as the data source in any products derived from these data. Any Users wishing to modify the data should describe the types of modifications they have performed. The User should not misrepresent the data, nor imply that changes made were approved or endorsed by BLM. This data may be updated by the BLM without notification.
Spatial Reference Information
Horizontal Coordinate System
Reference system from which linear or angular quantities are measured and assigned to the position that a point occupies.
Coordinate System Details
Geographic coordinate system
Latitude resolution: 2e-008
Longitude resolution: 2e-008
Geographic coordinate units: Decimal Degrees
Geodetic model
Horizontal datum name: D North American 1983
Ellipsoid name: GRS 1980
Semi-major axis: 6378137.0
Denominator of flattening ratio: 298.257222101
Spatial Domain
The geographic areal domain of the data that describes the western, eastern, northern, and southern geographic limits of data coverage.
Bounding Coordinates
In Unprojected coordinates (geographic)
Boundary Coordinate
West -125 (latitude)
East -116 (latitude)
North 49 (longitude)
South 41 (longitude)
Data Structure and Attribute Information
Summary of the information content of the data, including other references to complete descriptions of entity types, attributes, and attribute values for the data.
Entity and attribute overview:
The format of the quad code, in attribute q30, is translated from the format typically provided by USGS. Translation is required for use in many database programs (e.g. Informix, Oracle) because often, when dealing with a character field, the database program will not accept a numeral in the first space.

Direct spatial reference method: Vector
Indirect spatial reference method: Oregon Washington
Attributes of 30-Minute Quad Polygons
Detailed descriptions of entity type, attributes, and attribute values for the data.
Polygons at intervals of 30 Minutes of latitude and longitude
Internal feature number.
Attribute values: Sequential unique whole numbers that are automatically generated.
Attribute definition source:
The USGS Ohio code for the 30-minute quad, with the row/column coding listed first.
Attribute definition source:
A name up to 30 characters long. This will be the most current name given to a 30M quad, as determined by the source of the name.
Attribute definition source:
source of the name for the quad.
Attribute domain values
Value Definition
100k Name used
Definition Source:
Name from nearest USGS 100k map used
15M Name used
Definition Source:
Name from nearest 15M USGS map used
7.5M Name used
Definition Source:
Name from nearest 7.5M USGS mape used
No Name used
Definition Source:
No name assigned
Existing Name used
Definition Source:
Name from existing 30M map used
Feature geometry.
Attribute values: Coordinates defining the features.
Attribute definition source:
SDTS Feature Description
Description of point and vector spatial objects in the data using the Spatial Data Transfer Standards (SDTS) terminology.
Spatial data transfer standard (SDTS) terms
Feature class
Type: GT-polygon composed of chains
Count: 324
Data Quality and Accuracy Information
Information about the fidelity of relationships, data quality and accuracy tests, omissions, selection criteria, generalization, and definitions used to derive the data.
Logical consistency report:
This theme was created by generating the lines at a .500 degree interval. There are no node errors or open polygons. This theme was built with polygon topology. The original defined datum is NAD27.
Completeness report:
This theme covers all lands in Oregon and Washington as well as parts of California, Nevada, Idaho, British Columbia, Alberta and the Pacific Ocean. Only quads covering Oregon are attributed with common names.
Attribute Accuracy
Accuracy of the identification of data entities, features and assignment of attribute values.
Attribute accuracy report:
The Ohio codes were generated based on the latitude/longitude of the SE corner of the polygon. The common names were attributed from one of four sources if the quad covered some portion of Oregon. From an existing, or once used, USGS Map name. From an existing, or once used, BLM map name. For the 100k map that covers the same area. For the 7.5 minute map that covers the same area. Source for the map name is noted in the SOURCE attribute.
Positional Accuracy
Accuracy of the positional aspects of the data.
Horizontal accuracy report:
Vertical accuracy report:
Data Source and Process Information
Data Sources
Information about the source data used to construct or derive the data.
Data source information
USGS Map Name
Title: USGS 7.5 Minute Quadrangles
Originators: USGS
Publication date: 19940501
Map scale denominator: 24000
Media: hardcopyPaper
Source contribution:
Beginning date: unknown
Ending date: 19940501 Ending time: unknown
Currentness reference:
publication date
Title: National Geographic Names DataBase
Originators: USGS
Publication date: 19980301
Media: None
Source contribution:
Title: BLM QUADS30m
Originators: BLM
Publication date: 20020101
Media: onLine
Source contribution:
Date: 20020101 Time: unknown
Currentness reference:
publication date
Process Steps
Information about events, parameters, tolerances and techniques applied to construct or derive the data.
Process step information
Process Step 1
Process description:
This coverage was generated in Arc/Info using a computer program that created the polygons at 30-minute intervals of latitude and longitude. Another computer program used the latitude/longitude of the SE corner of the polygons to calculate their Ohio codes. The GNIS NGNDB was related to the Ohio codes to populate the common names field. GNIS NGNDB was compared to a USGS maps, and where quad names disagreed, the name from the USGS map populated the name field. The BLM archives were search for 30-minute series maps. Where they found the name of those maps, they were used to populate the name field. Where no USGS or BLM map was found, names of the 100k USGS map series were use to populate a quad name. When two quads required names only the quad that covered the feature for which the 100k map was named by was named using that name. For those remaining the name of one 7.5 Minute map within the polygon boundary was use to populate the name field.
Process date: 20000401
Data Distribution Information
Description of the data known by the party from whom the data may be obtained, liability of party distributing data, and technical capabilities required to use the data.
Resource description:
Downloadable Data
Distribution liability:
The BLM assumes no responsibility for errors or omissions. No warranty is made by the BLM as to the accuracy, reliability, or completeness of these data for individual use or aggregate use with other data; nor shall the act of distribution to contractors, partners, or beyond, constitute any such warranty for individual or aggregate data use with other data. Although these data have been processed successfully on computers of BLM, no warranty, expressed or implied, is made by BLM regarding the use of these data on any other system, or for general or scientific purposes, nor does the fact of distribution constitute or imply any such warranty. In no event shall the BLM have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of the use or reliance on the geographic data or arising out of the delivery, installation, operation, or support by BLM.
Distribution Point of Contact
Contact information for the individual or organization distributing the data.
Organization: Bureau of Land Management
Person: Eric Hiebenthal
Position: GIS Data Management Specialist
Phone: 503-808-6340
Fax: 503-808-6419
Email: ehiebent@blm.gov
contact instructions
Address type: mailing
P.O Box 2965
City: Portland
State or Province: OR
Postal code: 97208
County: US
Standard Order Process
Common ways in which data may be obtained.
Fees: Contact distributor.
Ordering instructions:
Data are only available through the Oregon/Washington State office of the Bureau of Land Management.
Metadata Reference
Metadata Date
Dates associated with creating, updating and reviewing the metadata.
Last updated: 20030101
Last metadata review date: 20141114
Metadata Point of Contact
Contact information for the individual or organization responsible for the metadata information.
Organization: Bureau of Land Management, Oregon State Office
Person: Roger Mills
Position: GIS Specialist
Phone: (503) 808-6340
Fax: (503) 808-6419
Telecommunications Device or Teletypewriter (TDD/TTY) phone: tdd/tty phone
Email: r2mills@blm.gov
Hours of service: 8:00-4:00
Address type: mailing
P.O. Box 2965
City: Portland
State or Province: OR
Postal code: 97208
County: US
Metadata Standards
Description of the metadata standard used to document the data and reference to any additional extended profiles to the standard used by the metadata producer.
Standard name: FGDC Content Standard for Digital Geospatial Metadata
Standard version: FGDC-STD-001-1998
Time convention: local time
FGDC Plus Metadata Stylesheet
Stylesheet: FGDC Plus Stylesheet
File name: FGDC Plus.xsl
Version: 2.0
Description: This metadata is displayed using the FGDC Plus Stylesheet, which is an XSL template that can be used with ArcGIS software to display metadata. It displays metadata elements defined in the Content Standard for Digital Geospatial Metadata (CSDGM) - aka FGDC Standard, the ESRI Profile of CSDGM, the Biological Data Profile of CSDGM, and the Shoreline Data Profile of CSDGM. CSDGM is the US Federal Metadata standard. The Federal Geographic Data Committee originally adopted the CSDGM in 1994 and revised it in 1998. According to Executive Order 12096 all Federal agencies are ordered to use this standard to document geospatial data created as of January, 1995. The standard is often referred to as the FGDC Metadata Standard and has been implemented beyond the federal level with State and local governments adopting the metadata standard as well. The Biological Data Profile broadens the application of the CSDGM so that it is more easily applied to biological data that are not explicitly geographic (laboratory results, field notes, specimen collections, research reports) but can be associated with a geographic location. Includes taxonomical vocabulary. The Shoreline Data Profile addresses variability in the definition and mapping of shorelines by providing a standardized set of terms and data elements required to support metadata for shoreline and coastal data sets. The FGDC Plus Stylesheet includes the Dublin Core Metadata Element Set. It supports W3C DOM compatible browsers such as IE7, IE6, Netscape 7, and Mozilla Firefox. It is in the public domain and may be freely used, modified, and redistributed. It is provided "AS-IS" without warranty or technical support.
Instructions: On the top of the page, click on the title of the dataset to toggle opening and closing of all metadata content sections or click section links listed horizontally below the title to open individual sections. Click on a section name (e.g. Description) to open and close section content. Within a section, click on a item name (Status, Key Words, etc.) to open and close individual content items. By default, the Citation information within the Description section is always open for display.
Download: FGDC Plus Stylesheet is available from the ArcScripts downloads at www.esri.com.