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TitleBLM Sections
Date Typepublication
Organization NameU.S. Forest Service
Role originator
Presentation Form mapDigital
Abstract THIS DATASET IS NOT COMPLETE FOR OKLAHOMA. This layer is based on Geographic Coordinate Data Base (GCDB) coordinate data. The locations of Public Land Survey System (PLSS) corners, as represented in geographic coordinate pairs, were derived from a variety of source documents, which include U.S. General Land Office and BLM survey plats/notes, as well as survey data obtained from other U.S. Government agencies, private sector survey firms, and local governments. The attributes assigned to PLSS polygons were taken from the BLM's Legal Land Description (LLD) data set, contained within the Legacy Rehost for the year 2000 (LR2000) automated records system. The coordinate data was produced by using control stations of known location, with varying degrees of accuracy, from various sources which include but are not limited to; U.S. Geological Survey (USGS) topological quadrangles and other sources, National Geodetic Survey (NGS) and US Coast & Geodetic Survey (USC&GS) Cooperative Base Network (CBN) control, Federal Base Network control (FBN), and Continuous Operating Reference Stations (CORS), and Global Positioning System (GPS) data, which is then analyzed and adjusted in concert with official survey data for any given geographic area. The Land Survey Information System Data Base (LSIS) data is a useful representation of the geometry and topology of parcels contained within the PLSS, but its application is intended for mapping purposes only. The GCDB data served from LSIS is not a substitute for a legal land survey.
Purpose The GCDB Data was created to provide the BLM and its public with a set of geographic foundation data that accurately portrays the locations of PLSS corners. The GCDB data is based on the best and most current survey records available and uses known geographic positions of control stations within the PLSS network. This data is a key component of the Land Survey Information System (LSIS) framework upon which parcel boundary information will be assembled.
Status onGoing
Descriptive Keywords Cadastral, PLSS, Land Grids, Township, LSI, Range, BLM, National Spatial Data Infrastructure, General Land Office, GLO, NSDI, PLSS, LSIS, Cadastral, Land Survey Information, LIS, Bureau of Land Management, Land Information System, Geographic Coordinate Data Base, GCDB, Sections, Oklahoma, Legal Description, Land Survey Information System, Public Land Survey System, PLSS, Arizona, Nebraska, Nevada, Utah, Oregon, Wyoming, Michigan, Montana, New Mexico, Arkansas, California, Idaho, North Dakota, Colorado, Washington, Contiguous US, Downloadable Data
Access Constraints otherRestrictions
Other Constraints access constraints: None
Use Constraints otherRestrictions
Other Constraints
Topic Category Code structure
Geographic Bounding Box
North bound latitude
West bound longitudeEast bound longitude
South bound latitude
Distribution Information
Individual NameRegina LeFort
Organization NameBureau of Land Management
Position NameL&RPO GCDB Lead
Voice(303) 236-0951
Facsimile(303) 236-6691
Address(303) 236-6691
Postal Code80225-0047
Electronic mail addressregina_lefort@blm.gov
Hours of Service
FeesNo fees are required for downloading the data that is on-line.
Ordering Instructions
Transfer Size5
Spatial Representation Information
Geometric Object Typesurface
Geometric Object Count1205454
Reference System
Data Quality
Evaluation Method
Topological ConsistencyThe data set is topologically structured with nodes at all intersections. Labels representing the legal land description are assigned to each land unit.
Absolute Positional AccuracyAccuracy of the individual points contained within the GCDB layers of LSIS that were determined using GMM software were adjusted using both compass rule and a least squares analysis, which examines the geometry of PLSS parcels in relation to the coordinate values of known locations for control points within the PLSS grid. Each individual point carries a reliablility factor indicating the error ellipse in both northing and easting which is reported after the least squares analysis is completed. Accuracy of the individual points contained within the GCDB layers of LSIS that were determined using PCCS software were adjusted using a succession of compass rule adjustments between the control points followed by a least squares analysis, which examines the geometry of PLSS parcels in relation to the coordinate values of known locations for control points within the PLSS grid. Each individual point carries positional reliability factors for the average of the misclosures in the data set and the maximum misclosure in the data set.
Attribute AccuracyData was checked for attribute accuracy by the GCDB personnel in each of the respective BLM State Offices.
Process StepGIS coverages are edgematched with adjoining township data sets to insure a seamless PLSS grid is created.
SourceSurvey control data from the official control station sheets (CBN, FBN, CORS).
Responsible PartyNational Geodetic Survey
Metadata StandardISO 19115:2003/19139