GIS Metadata

BLM OR Monitoring & Sample Point

Frequently-asked questions:

What does this data set describe?

BLM OR Monitoring & Sample Point

SAMPLE_PT: This dataset represents monitoring and sample locations (points). Monitoring is a generic term describing various kinds of assessments that the BLM makes on public land natural resources and/or management actions undertaken. The SAMPLE_PT dataset represents places where a measurement of some type has occurred. Examples of measurement types are: vegetation transects or plots, soil pit descriptions, and observations/photos of resource use or impact. For full documentation see SAMPLE POINTS SPATIAL DATA STANDARD. http://www.blm.gov/or/efoia/fy2012/im/p/im-or-2012-051.pdf

  1. How should this data set be cited?

    U.S. Department of Interior, Bureau of Land Management (BLM), 20170726, BLM OR Monitoring & Sample Point.

  2. What geographic area does the data set cover?

    Bounding coordinates:
    West: -124.099880
    East: -115.400000
    North: 48.877980
    South: 41.600000

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Calendar date: 20170726
    Currentness reference:
    publication date

  5. What is the general form of this data set?

    Geospatial data presentation form: vector digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Vector data set. It contains the following vector data types (SDTS terminology):
      • Entity point (42983)

    2. What coordinate system is used to represent geographic features?

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 8.98315284119521e-009. Longitudes are given to the nearest 8.98315284119521e-009. Latitude and longitude values are specified in Decimal Degrees.

      The horizontal datum used is D North American 1983.
      The ellipsoid used is GRS 1980.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257222101.

  7. How does the data set describe geographic features?

    Attributes & domains for Sample Points Theme (Source: BLM)

    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    Unique identifier for each sample point for the particular type of sampling indicated in SAMPLE_TYPE. Serves as the link to an external table (if any) with detailed measurement information by date (a one-to-many relationship). Districts are encouraged to develop standard naming schemes. (Source: BLM)

    A sample grouping identifier, if needed. (Source: BLM)

    The purpose for taking the sample at this location. (Source: BLM)

    ACEC - RNA monitoring  
    Aspen - Stand monitoring  
    Contract - Monitoring of a contract or permit  
    Erosion - Monitoring  
    Greenline - Riparian Measurement  
    HMA - Wild horse use or count  
    Juniper - Measurement  
    Potential Mineral Potential - Test wells or drill sites  
    NRI - National Resources Inventory Plot  
    Range Trend
    Range Trend - Monitoring  
    Range Utilization
    Range Utilization - Measurement  
    Recreation Use
    Recreation Use - Monitoring  
    Riparian - Monitoring  
    Riparian Utilization
    Riparian Utilization 
    Road/Trail - Documentation  
    Sensitive Birds
    Sensitive Birds - Monitoring  
    Sensitive Plants
    Sensitive Plants - Monitoring  
    Shade - Measurement  
    Soil - Description  
    Soil Crust
    Soil Crust - Monitoring  
    Stand Exam
    Stand Exam 
    Stand Exam
    Stand Exam-EcoSurvey 
    Study Plot
    Study Plot - Research  
    Treatment - Effectiveness or implementation monitoring  
    Vegetation - Plant Community  
    Water Contaminants
    Water Contaminants - Measurement  
    Water Temperature
    Water Temperature - Measurement  
    Wilderness Use
    Wilderness Use - Monitoring  
    Wildlife Utilization
    Wildlife Utilization - Measurement  

    The method or standard protocol used to conduct the sampling activity at this point. The method is dependent on the SAMPLE_TYPE. (Source: BLM)

    Belt Transect
    Belt Transect - For vegetation  
    Circle Plot
    Circle Plot - For vegetation  
    Cole Browse
    Cole Browse 
    Counter - Traffic counter  
    ESI Veg Plot
    ESI Veg Plot - Ecological Site Inventory  
    Fred Hall 2002
    Fred Hall 2002 - Photo method  
    Hanna Multisensor Probe
    Hanna Multisensor Probe 
    Herbaceous Utilization
    Herbaceous Utilization 
    HOBO Temp Probe
    HOBO Temp Probe 
    Line Point-Intercept
    Line Point-Intercept 
    Line Transect
    Line Transect - For vegetation or surface  
    Nested Frequency
    Nested Frequency - For vegetation  
    NRCS 232
    NRCS 232 - Soil description  
    NRCS NRI - National Resoruces Inventory  
    Ocular Count
    Ocular Count - Visual estimate  
    Ocular Cover
    Ocular Cover - Vegetation cover estimate  
    Pace 180
    Pace 180 - For vegetation  
    Utilization Cage
    Utilization Cage 
    Winward 2000
    Winward 2000 - Greenline method  
    Woody Utilization
    Woody Utilization 

    The last date that a sample was taken or measured at this point. (Source: BLM)

    Direction of the sampling activity, if applicable. For example, the direction the camera is pointed or of a transect line. Expressed as one or two character compass cardinal direction points (eight choices, starting at N). (Source: BLM)

    Length of the sampling activity, if applicable. The sample point is taken as the starting point. Combined with DIRECTION, a line can be created if needed. (Source: BLM)

    The height of the ground above mean sea level. (Source: BLM)

    The date the monitoring or sampling point was established in the field. (Source: BLM)

    For monitoring and sampling activities that have only one or two ratings or measurements and a related table or database is not needed. This attribute holds the last recorded rating or measurement only.RATING1, 2, and 3 all refer to the same measurement date. The RATING2 is only used if there is a second measure besides what is recorded in RATING1 and RATING3 is only used if there is a third measure besides what is in RATING1 and 2. cceptable values depend on SAMPLE_TYPE and SAMPLE_METH and are established by the program. They might be qualitative such as "Good" or "Stable" or a number.  (Source: BLM)

    For monitoring and sampling activities that have only one or two ratings or measurements and a related table or database is not needed. This attribute holds the last recorded rating or measurement only. RATING1, 2, and 3 all refer to the same measurement date. The RATING2 is only used if there is a second measure besides what is recorded in RATING1 and RATING3 is only used if there is a third measure besides what is in RATING1 and 2. Acceptable values depend on SAMPLE_TYPE and SAMPLE_METH and are established by the program. They might be qualitative such as "Good" or "Stable" or a number. (Source: BLM)

    For monitoring and sampling activities that have only one or two ratings or measurements and a related table or database is not needed. This attribute holds the last recorded rating or measurement only. RATING1, 2, and 3 all refer to the same measurement date. The RATING2 is only used if there is a second measure besides what is recorded in RATING1 and RATING3 is only used if there is a third measure besides what is in RATING1 and 2. Acceptable values depend on SAMPLE_TYPE and SAMPLE_METH and are established by the program. They might be qualitative such as "Good" or "Stable" or a number. (Source: BLM)

    It is not uncommon for the same monitoring or sampling point to have more than one name because of changes in staff and databases. Knowing the other names is sometimes critical to determining if the sample location is indeed the same or different than another named location. One or more historical names can be placed in this field. (Source: BLM)

    Computer storage location for a photo file (e.g., jpg), Word document, spreadsheet or other associated document. The value in this field serves as a hyperlink to that location and the file it opens. Could also be a directory or dataset that opens for further browsing (where multiple files are being referenced). (Source: BLM)

    The name of the associated treatment or project that is being monitored, measured or otherwise sampled. (Source: BLM)

    The actual source of the GIS coordinates for the points. (Source: BLM)

    Lines duplicated or buffered from Cartographic Feature Files (USFS)
    Digital Elevation Model (30 m or better accuracy) used for creation of contours
    Lines generated to connect discontinuous features
    Lines duplicated or buffered from (24K scale accuracy) USGS Digital Line Graphs
    Screen digitized linework over Digital Orthoquad backdrop
    Screen digitized linework over Digital Raster Graphic backdrop
    Lines snapped to Geographic Coordinate Database Points
    Lines obtained from a Global Positioning System device
    Linework derived from interpretation of satellite or other non-photographic imagery
    Digitized linework from hardcopy map
    Lines duplicated from Digital Master Title Plat
    Source Layer from BLM GIS
    Survey methods were used to create the linework (e.g., COGO)
    Tiger Data
    Coordinates only given as a legal description (township, range, section)
    Unknown coordinate source
    WODDB Photogrammetric
    CADNSDI is the cadastral national spatial data infrastructure publication data set for rectangular and non-rectangular public land survey system (PLSS) data. CADNSDI - Coordinates from or snapped to the CADNSDI dataset

    How close, in feet, the spatial GIS depiction is to the actual location on the ground. There are several factors to consider in GIS error: scale and accuracy of map-based sources, accuracy of GPS equipment, and the skill level of the data manipulators. A value of "0" indicates no entry was made. This is the correct value when the COORD_SRC is another GIS theme (Digital Line Graphs (DLG), Geographic Coordinate Database (GCD), and Digital Elevation Model (DEM)) because the accuracy is determined by that theme. However, if COORD_SRC is MAP (digitized from a paper map) or GPS, a value of "0" indicates a missing value that should be filled in either with a non-zero number or "-1." A value of "-1" indicates that the accuracy is unknown and no reliable estimate can be made. (Source: BLM)

    Free text for comments about the sample point. (Source: BLM)

    Automatically generated ID no. (Source: ESRI)

    Name (mixed case, first and last) of the subject matter specialist most knowledgeable about the sample point (contact). (Source: BLM)

    Entity and attribute overview:
    Attributes are provided that give basic information about source, type, and accuracy of the line data. More information may be found in the data standard if available: https://www.blm.gov/or/gis/data.php
Back to Top

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

    • U.S. Department of Interior, Bureau of Land Management (BLM)

  2. Who also contributed to the data set?

    Oregon BLM

  3. To whom should users address questions about the data?

    Robert Hopper
    Bureau of Land Management
    Rangeland Management Specialist
    2965 P.O. Box
    Portland, OR97208

    (503) 808-6118 (voice)
    (503) 808-6334 (FAX)
Back to Top

Why was the data set created?

SAMPLE_PT is BLM corporate data to be collected and maintained in support of Land Use Management.

Back to Top

How was the data set created?

  1. Where did the data come from?

    Various (source 1 of 1)

    BLM, unknown, Various.

    Type of source media: onLine
    Source contribution:
    BLM District Offices

  2. What changes have been made?

    Date: unknown (change 1 of 2)
    Most monitoring and sampling points are input from GPS coordinates or using Digital Raster Graphic (DRG) or Digital Orthoquad (DOQ) backdrops for heads-up digitizing. Some are digitized from paper maps. The source of the coordinates is captured in the attribute COORD_SRC. The data does not provide the actual, measured values because there is an increasing number of measurements over a range of dates.

    Person responsible for change:
    Pam Keller
    Bureau of Land Management
    GIS Specialist
    28910 Hwy 20 West
    Hines, OR97738-9424

    (541) 573-4486 (voice)
    (541) 573-4411 (FAX)

    Date: 20130529 (change 2 of 2)
    New domain values added. "Utilization Cage" in SAMPLE_METH and "Range Utilization" in SAMPLE_TYPE

    Person responsible for change:
    Steve Salas
    GIS Specialist
    P.O. Box 2965
    Portland, OR97208

    503-808-6416 (voice)

Back to Top

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

    Required attributes have an accuracy of at least ninety percent. Sample points require a high level of positional accuracy (generally within 50 feet) in order to be useful for intended purposes. A sample point represents the location of specific measurement of a particular resource at a point in time. The resource being measured may not even exist in a different (even if nearby) location. It may be critical that a point is located on one side or the other of a stream or road. There may be many sample points close together and different Global Positioning System (GPS) locations obtained with every visit. Accurate location is critical to being able to distinguish points that are supposed to be different from points that are supposed to be in the same location

  2. How accurate are the geographic locations?


  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    Data is updated annually, after field season or as needed. Also, it is archived annually, at the end of the fiscal year.

  5. How consistent are the relationships among the observations, including topology?


Back to Top

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

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. DATA STEWARD APPROVAL: Molly Anthony, state data steward for SAMPLE_PT, approved the use of this dataset on August 31, 2016.

Distributor 1 of 1

  1. Who distributes the data set?

    Eric Hiebenthal
    Bureau of Land Management
    GIS Data Management Specialist
    P.O Box 2965
    Portland, OR97208

    503-808-6340 (voice)
    503-808-6419 (FAX)
    Contact Instructions:
    contact instructions

  2. What's the catalog number I need to order this data set?

  3. What legal disclaimers am I supposed to read?

    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.

  4. How can I download or order the data?

    • Availability in digital form:

    • Data format:
      in format Arc GIS (version Feature Class) Winzip

    • Cost to order the data: Contact distributor.

    • Special instructions:

      Data are only available through the Oregon/Washington State office of the Bureau of Land Management.

  5. Is there some other way to get the data?

  6. What hardware or software do I need in order to use the data set?

    Arc GIS, Winzip

Back to Top

Who wrote the metadata?

Last modified: 20130326
Last reviewed: 20170320

Metadata author:
Roger Mills
Bureau of Land Management, Oregon State Office
GIS Specialist
P.O. Box 2965
Portland, OR97208

(503) 808-6340 (voice)
(503) 808-6419 (FAX)
Hours of Service: 8:00-4:00
Contact Instructions:

Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata(FGDC-STD-001-1998)

Back to Top