GCDB_LADESC

Bureau of Land Management U.S. Forest Service 20020429 GCDB_LADESC vector digital data Denver, Colorado Bureau of Land Management withheld GCDB_LADESC 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 (USCGS) 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 Data Base (LSI) 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 LSI 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 (LSI) framework upon which parcel boundary information will be assembled. en A Land Grant layer provided by the BLM was merged with the LADESC polygons by Weston Solutions, Inc. This was done so that grant names, survey date, and survey approved date would be available. The Land Grant and LADESC layers were provided by the BLM and did not overlay exactly. Therefore, the Land Grant layer was edited by Weston Solutions, Inc. so the lines would match the LADESC layer (thus preventing sliver polygons). NOTE that many of the grants in the Land Grant layer overlay polygons in the LADESC layer that do not have a SURSYS value of G(rant). See Process Steps for additional information. 18490303 present ground condition In work As needed -105.702465 -103.629246 35.032516 33.722044 114574.007860 682824.749958 3470970.249879 4102413.750097 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 BLM-State New Mexico 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. No warranties of any sort, including accuracy, fitness, or merchantability is made by the New Mexico Office of the State Engineer or Weston Solutions, Inc., for the enhanced land grants data. A Land Grant layer provided by the BLM was merged with the LADESC polygons by Weston Solutions, Inc. This was done so that grant names, survey date, and survey approved date would be available. The Land Grant and LADESC layers were provided by the BLM and did not overlay exactly. Therefore, the Land Grant layer was edited by Weston Solutions, Inc. so the lines would match the LADESC layer (thus preventing sliver polygons). NOTE that many of the grants in the Land Grant layer overlay polygons in the LADESC layer that do not have a SURSYS value of G(rant). This problem has been reported to the BLM New Mexico office. Regina LeFort Bureau of Land Management LRPO 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 8.2.0.700 Personal GeoDatabase Feature Class 100% of the data was checked for attribute accuracy by the GCDB personnel in each of the respective BLM State Offices. SURSYS field in GCDB_LADESC NOTE that many of the grants in the Land Grant layer overlay polygons in the LADESC layer that do not have a SURSYS value of G(rant). This problem has been reported to the BLM New Mexico office. 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 LSI 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 LSI 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. Land Grants The Land Grants (provided by BLM) were fitted to the existing GCDB geometry. The following land grants required a spatial shift in at least one line segement that was greater than 350 meters: Refugio Colony, Sandia Pueblo, San Pedro, Laguna Pueblo, Laguna Purchases, Santa Ana Pueblo, Santo Domingo Pueblo, Jemez Pueblo, Mora, and Cuyamungue. Bureau of Land Management 20020430 Land Survey Information (LSI) 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 the best and most current survey records. withheld withheld withheld withheld Unknown mailing and physical address

190 Queen Anne Avenue North, Suite 200

Seattle WA 98109 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 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. Unknown 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. Unknown 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 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. Unknown 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. Unknown 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 LSI database. These layers can then be downloaded as shapefiles through the LSI website. Unknown Keith Palmer Weston Solutions, Inc. 206-521-7633 mailing and physical address

190 Queen Anne Ave N, Suite 200

Seattle WA 98109 Keith.Palmer@westonsolutions.com 8 am to 5 pm, Pacific Time Performed Arc/Info IDENTITY command to transfer SECTN field from FIRST coverage to LADESC coverage. Arc/Info 8.3 06/04/2003 Keith Palmer Weston Solutions, Inc. 206-521-7633 mailing and physical address

190 Queen Anne Ave N, Suite 200

Seattle WA 98109 Technical Manager Keith.Palmer@westonsolutions.com 8 am to 5 pm, Pacific Time Performed Arc/Info UNION command to integrate landgrant information with ladesc polygons. The landgrant layer (provided by BLM) had to be manually edited so that all the lines that were close to ladesc lines were snapped to the ladesc lines. This was done to prevent the creation of sliver polygons. The landgrant lines were moved individually to match the existing GCDB lines when the line shapes were the same and the line-move was consistent with the original SURSYS attributes. Arc/Info 8.3 06/04/2003 Dataset copied. withheld 20030619 12510000 Dataset copied. withheld 20091216 15170500 Vector Simple FALSE 0 TRUE FALSE coordinate pair 0.000294 0.000294 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 GCS_North_American_1983 NAD_1983_UTM_Zone_13N 1.000000 Explicit elevation coordinate included with horizontal coordinates GCDB_LADESC Coordinate Measured Layer (GCDB Control Points) ArcSDE Feature Class 0 OBJECTID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. OBJECTID OID 4 0 0 SHAPE Feature geometry. ESRI Coordinates defining the features. SHAPE Geometry 0 0 0 SECTN Section Number 001 036 FID_blm_landgrant Integer 4 0 0 LNDKEY Land Key Index Concatenation of State + Principal Meridian + Township + Range LNDKEY String 50 0 0 QUARTER Quarter section Designator NW Northwest NE Northeast SW Southwest SE Southeast QUARTER String 2 0 0 QQUARTER Quarter-quarter section Designator NW Northwest NE Northeast SW Southwest SE Southeast QQUARTER String 2 0 0 NOMLOC Nominal Location NOMLOC String 1 0 0 SURSYS Survey System Type SURSYS String 1 0 0 SURNUM Survey System Designator SURNUM String 5 0 0 SURSUF Survey System Suffix SURSUF String 2 0 0 SURNOTE Survey System Note SURNOTE String 3 0 0 LADESCAR Land Description Area Acreage LADESCAR Double 8 0 0 GRANT_NAME Name of the land grant GRANT_NAME String 52 0 0 SURVEY_APPROVED Date the survey was approved SURVEY_APPROVED Date 8 0 0 GRANT_CONFIRMED Date the grant was confirmed GRANT_CONFIRMED Date 8 0 0 SHAPE_Length Length of feature in internal units. ESRI Positive real numbers that are automatically generated. SHAPE_Length Double 8 0 0 FID_section_utm1383 FID_section_utm1383 Integer 4 0 0 MERIDIAN MERIDIAN SmallInteger 2 0 0 TOWNSHIP TOWNSHIP String 6 0 0 RANGE RANGE String 6 0 0 SECTION SECTION SmallInteger 2 0 0 TDISPLAY TDISPLAY String 7 0 0 RDISPLAY RDISPLAY String 7 0 0 TRDISPLAY TRDISPLAY String 14 0 0 PDSFIX PDSFIX String 2 0 0 SOURCE SOURCE String 20 0 0 SCALE SCALE Integer 4 0 0 CREATED CREATED String 11 0 0 MODIFIED MODIFIED String 11 0 0 TECH TECH String 3 0 0 SUFFIX SUFFIX String 3 0 0 SHAPE_Area Area of feature in internal units squared. ESRI Positive real numbers that are automatically generated. SHAPE_Area Double 8 0 0 SHAPE_Area SECTN String 3 0 0 Area of feature in internal units squared. ESRI Positive real numbers that are automatically generated. The LSI Land Description Area layer (LADESC) is the smallest area unit of the GCDB. U.S Department of the Interior, Bureau of Land Management, LSI Database Description Document other supporting documentation. Internet versions are available at: www.blm.gov/gcdb/standards/index.htm Regina LeFort Bureau of Land Management LRPO 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