GCDB_Laramie

Bureau of Land Management U.S. Forest Service 20060615 GCDB_Laramie_2009 vector digital data Denver, Colorado Bureau of Land Management withheld GCDB_Laramie_2009 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. 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. en 18490303 present ground condition In work As needed -105.291889 -104.042129 41.656692 40.992537 621948.533569 963484.737438 181395.075456 421419.450296 None General Land Office GLO Bureau of Land Management BLM Public Land Survey System PLSS Geographic Coordinate Data Base GCDB National Spatial Data Infrastructure NSDI Land Information System LIS Land Survey Information LSI Cadastral Township Range Land Survey Information System LSIS BLM-State Arizona Arkansas California Colorado Idaho Michigan Montana Nebraska Nevada New Mexico North Dakota Oregon Utah Washington Wyoming BLM-Theme Cadastral None Contiguous US None The geographic coordinates and their associated products are NOT legal land survey records. The coordinates can NOT be used as a substitute for a legal land survey. They can be used for record keeping, mapping, graphics and planning purposes only. No warranty is made by the Bureau of Land Management for use of the data for purposes not intended by BLM. Regina LeFort Bureau of Land Management L&RPO GCDB Lead mailing address

P.O. Box 25047

Mail Stop: WO - 330D (DFC)

Building 40, Denver Federal Center

Denver Colorado 80225-0047 USA (303) 236-0951 (303) 236-6691 regina_lefort@blm.gov For information about the data content, please contact the BLM State Office, GCDB Manager or GCDB Contact at: http://www.blm.gov/gcdb/gcdbsites/index.html For information directly relating to metadata, please contact Regina LeFort at regina.lefort@blm.gov ESRI ArcCatalog 9.3.1.3000 Shapefile Data was checked for attribute accuracy by the GCDB personnel in each of the respective BLM State Offices. The data set is topologically structured with nodes at all intersections. Labels representing the legal land description are assigned to each land unit. All GCDB spatial outputs are visually inspected for completeness to ensure that all survey data for a given geographic area is included in the data set. Accuracy 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. Bureau of Land Management 20041029 Land Survey Information System (LSIS) tabular digital data Denver, Colorado Bureau of Land Management online 18490303 present ground condition BLM Survey data in the form of official (microfilm, CD, other) survey and BLM, abstracted into a vector digital format. U.S. Forest Service 19980601 Automated Lands Project (ALP) tabular digital data Washington, D.C. U.S. Forest Service disc 19980601 present ground condition USFS Survey and control data from the Cartographic Feature File (CFF) data set. U.S Geological Survey 1931 USGS standard topological quadrangles tabular digital data Denver, Colorado U.S. Geological Survey disc 1931 present ground condition USGS Digitized control data from standard topological quadrangle sheets. National Geodetic Survey 20000101 Official Control Station Sheets tabular digital data Silver Springs, Maryland National Geodetic Survey disc 19010101 present ground condition NGS Survey control data from the official control station sheets (CBN, FBN, CORS). Compile survey input data from current BLM official measurements, supplemented in some locations with USFS and private survey records. withheld withheld withheld withheld Unknown Compile listings of known locations of PLSS corners. withheld withheld withheld withheld withheld Unknown Coordinates of control stations are entered into a control data base with associated reliabilities. Unknown This data has been created in either the GMM or PCCS format. The following process steps refer to data in GMM format. With GMM survey data, abstracted from survey plats, and control stations extracted from the control database, are manually entered with weighting factors into GMM software. Compass rule and least squares adjustments are performed using weighting factors assigned to both control stations and survey line data, based on methodologies and vintage of survey. With GMM, section subdivision is performed to achieve land unit detail to at least the forty acre parcel level. Instructions for calculating non-regular and minor subdivisions are persistently stored during collection and rerun after every new adjustment in order to achieve the detail necessary to delineate all lines required for depicting federal rights, interestes, restrictions, and encumberances. Coincident lines and lines identified as non-boundary lines are removed from the data set used for final land unit constructions. Line intersections are computed and given unique identifiers and land units are constructed. GMM lists all coordinates produced by the compass rule and least squares adjustments and subdivision, with conectivity codes between points and compiles them into a single file for development of Geographic Information Systems (GIS) output. Unknown This data has been created in either the GMM or PCCS format. The following process steps refer to data in PCCS format. With PCCS, survey data abstracted from survey plats and control stations extracted from control data base are manually entered into the PCCS processing software. A succession of compass rule adjustments is performed on the lines to adjust them to the control points, followed by a least squares analysis. The resulting coordinates are accompanied by indications of positional reliability; the average of misclosures in the data set and the maximum misclosure in the data set. PCCS lists all coordinates produced by the compass rule and least squares adjustments with conectivity codes between points and compiles them into a single file for development of GIS files. With PCCS, section subdivision is performed to achieve land unit detail to at least the forty acre parcel level. Unknown GCDB data conversion software verifies correctness of GCDB file formats and content. Unknown Verified coordinate, line and label files are converted to GIS coverages using the topology check application. All errors in topology are flagged for editing and correction. Unknown If topological errors exist, editing of arc and node data, as well as parcel labels, is performed using either GMM or ArcInfo Interface (AII). (PCCS townships can only be edited using AII). Final edits are entered into input files and the process is repeated until all errors are corrected and a successful GIS coverage is created. Unknown GIS coverages are edgematched with adjoining township data sets to insure a seamless PLSS grid is created. Unknown Topologically correct GIS coverages are modified to use FGDC compliant naming conventions and then loaded into the LSIS database. These layers can then be downloaded as shapefiles through the LSIS website. Unknown Metadata imported. Dataset copied. withheld 20071115 12283600 Metadata imported. withheld 20100622 08432500 Dataset copied. withheld 20100622 08493300 Dataset copied. withheld 20100622 08500600 Vector Simple FALSE 0 TRUE FALSE North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 GCS_North_American_1983 NAD_1983_StatePlane_Wyoming_East_FIPS_4901_Feet coordinate pair survey feet 0.000000 0.000000 1.000000 Explicit elevation coordinate included with horizontal coordinates GCDB_Laramie A Legal Area Description provides the structure for assembling the components of a single legal description into one. The components of the legal area description can be used to build legal descriptions based on areas. For example, a legal area description could be a lot in a subdivision and that lot may be contained in a Public Land Survey System Area. FGDC Feature Class 0 VALIDATION objectid OID 4 10 0 Internal feature number. Esri Sequential unique whole numbers that are automatically generated. coopview.sde.GCDB_Laramie.area coopview.sde.GCDB_Laramie.area Double 8 38 8 shape shape Geometry 4 0 0 Feature geometry. ESRI Coordinates defining the features. shape Feature geometry. ESRI Coordinates defining the features. perimeter Double 8 38 8 PERIMETER ladesc_ Integer 4 10 0 LADESC_ ladesc_id Integer 4 10 0 LADESC_ID sec_no String 3 0 0 SEC_NO sec_frac String 1 0 0 SEC_FRAC sec_dup String 1 0 0 SEC_DUP nominal_lo String 1 0 0 NOMINAL_LO minor_sub String 4 0 0 MINOR_SUB survey_typ String 1 0 0 SURVEY_TYP survey_num String 5 0 0 SURVEY_NUM survey_suf String 2 0 0 SURVEY_SUF survey_not String 3 0 0 SURVEY_NOT acreage String 9 0 0 ACREAGE acre_src_c String 1 0 0 ACRE_SRC_C dup_desc_c String 1 0 0 DUP_DESC_C discrepanc String 1 0 0 DISCREPANC exception_ String 3 0 0 EXCEPTION_ state_cd String 2 0 0 STATE_CD prinmer_cd String 2 0 0 PRINMER_CD tier_no String 3 0 0 TIER_NO tier_frac String 1 0 0 TIER_FRAC tier_dir_c String 1 0 0 TIER_DIR_C range_no String 3 0 0 RANGE_NO range_frac String 1 0 0 RANGE_FRAC range_dir_ String 1 0 0 RANGE_DIR_ township_d String 1 0 0 TOWNSHIP_D latitude Double 8 22 9 LATITUDE longitude Double 8 22 9 LONGITUDE subsurf_on String 1 0 0 SUBSURF_ON validation String 1 0 0 st_area(shape) st_area(shape) Double 0 0 0 st_length(shape) st_length(shape) Double 0 0 0 The LSIS Land Description Area layer (LADESC) is the smallest area unit of the GCDB. U.S Department of the Interior, Bureau of Land Management, LSIS Database Description Document other supporting documentation. Internet versions are available at: www.blm.gov/gcdb/standards/index.htm Regina LeFort Bureau of Land Management L&RPO GCDB Lead mailing address

P. O. Box 25047

WO-330D (DFC)

Building 40, Denver Federal Center

P.O. Box 25047

WO - 330D (DFC)

Building 40, Denver Federal Center