Surface Gamma-Ray Survey of the Barre West Quadrangle, Washington and Orange Counties, Vermont

Metadata also available as

Frequently-anticipated questions:

What does this data set describe?

Title:

Surface Gamma-Ray Survey of the Barre West Quadrangle, Washington and Orange Counties, Vermont

Abstract:

This study presents the results from a ground-based gamma ray survey of bedrock outcrops in the 7.5-minute Barre West quadrangle, Vermont. Data were collected with a Geofyzika 512-channel portable gamma-ray spectrometer (GS-512) with a sodium iodide, thallium-activated scintillation probe. During the summer of 2003, 493 data points were collected at outcrops throughout the Barre West quadrangle. Two detailed transects were conducted at two roadcuts along Interstate 89 at Exits 7 and 8 to identify outcrop-scale differences in gamma radiation emissions.

Supplemental_Information:

The GIS database is accompanied by a text pamphlet, in PDF format, and a readme.txt file.

  1. How should this data set be cited?

G.J. Walsh, A.M. Satkoski, 2005, Surface Gamma-Ray Survey of the Barre West Quadrangle, Washington and Orange Counties, Vermont: Scientific Investigations Report 5276, U.S. Geological Survey, Reston, Virginia.

Online Links:

Other_Citation_Details:

Walsh, G.J., and Satkoski, A.M., 2005, Surface Gamma-Ray Survey of the Barre West Quadrangle, Washington and Orange Counties, Vermont: U.S. Geological Survey Scientific Investigations Report 5276.

  1. What geographic area does the data set cover?

West_Bounding_Coordinate: -72.624727

East_Bounding_Coordinate: -72.498748

North_Bounding_Coordinate: 44.249956

South_Bounding_Coordinate: 44.125783

  1. What does it look like?

055276.gif (GIF)

Composite eU-eTh-K map (figure 9 of text pamphlet)

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

Calendar_Date: 2005

Currentness_Reference: publication date

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

Geospatial_Data_Presentation_Form: vector digital data

  1. How does the data set represent geographic features?

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

This is a Point data set. It contains the following vector data types (SDTS terminology):

      • Entity point (493)
      • Point (4)

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

Grid_Coordinate_System_Name: State Plane Coordinate System 1983

State_Plane_Coordinate_System:

SPCS_Zone_Identifier: 4400

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.999964

Longitude_of_Central_Meridian: -72.500000

Latitude_of_Projection_Origin: 42.500000

False_Easting: 500000.000000

False_Northing: 0.000000

Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 0.000032
Ordinates (y-coordinates) are specified to the nearest 0.000032
Planar coordinates are specified in meters

The horizontal datum used is North American Datum of 1983.
The ellipsoid used is Geodetic Reference System 80.
The semi-major axis of the ellipsoid used is 6378137.000000.
The flattening of the ellipsoid used is 1/298.257222.

  1. How does the data set describe geographic features?

grs_0813.pat

FID

Internal feature number. (Source: ESRI)

Sequential unique whole numbers that are automatically generated.

Shape

Feature geometry. (Source: ESRI)

Coordinates defining the features.

AREA

Area of feature in internal units squared. (Source: ESRI)

Area is always zero for point coverages. Values are automatically generated.

PERIMETER

Perimeter of feature in internal units. (Source: ESRI)

Perimeter is always zero for point coverages. Values are automatically generated.

GRS_0813#

Internal feature number. (Source: ESRI)

Sequential unique whole numbers that are automatically generated.

GRS_0813-ID

User-defined feature number. (Source: ESRI)

STATION

LATDEG

LATMIN

LATSEC

LATDD

LONGDEG

LONGMIN

LONGSEC

LONGDD

OUTCROP

K_ORIG

U_ORIG

TH_ORIG

ROCK

ROCK1

Entity_and_Attribute_Overview: <https://pubs.usgs.gov/sir/2005/5276/readme.txt>

Entity_and_Attribute_Detail_Citation: <https://pubs.usgs.gov/sir/2005/5276/readme.txt>

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • G.J. Walsh, A.M. Satkoski
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?

Greg Walsh
U.S. Geological Survey
Geologist

802-828-4528 (voice)
802-828-4465 (FAX)
gwalsh@usgs.gov

Hours_of_Service: 0900 to 1700 eastern standard time

Why was the data set created?

The report was published as part of a study of fractured bedrock aquifers. The digital data are intended for use by all government, academic, commercial, or other agencies in need of digital geologic map information.

How was the data set created?

  1. From what previous works were the data drawn?

Walsh and Satkoski (2005) (source 1 of 1)

, 2005, Surface Gamma-Ray Survey of the Barre West Quadrangle, Washington and Orange Counties, Vermont: Scientific Investigations Report 5276, U.S. Geological Survey, Reston, Virginia.

Online Links:

Other_Citation_Details:

Walsh, G.J., and Satkoski, A.M., 2005, Surface Gamma-Ray Survey of the Barre West Quadrangle, Washington and Orange Counties, Vermont: U.S. Geological Survey Scientific Investigations Report 5276.

Source_Scale_Denominator: 24000

Source_Contribution: original data

  1. How were the data generated, processed, and modified?

(process 1 of 1)

Location information was provided by general purpose hand-held GPS receiver (Garmin eTrex Venture). Point data were collected with GPS. Data from the gamma ray spectrometer was exported to Excel and combined in ArcView version 3.3, converted into shapefiles, and then imported into Arc/Info. Database files were edited as a coverage in Arc/Info and later converted to shapefiles. The projected point coverage was unprojected to geographic coordinates and exported to SDTS format.

Data sources produced in this process:

    • Walsh and Satkoski (2005)
  1. What similar or related data should the user be aware of?

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

  1. How well have the observations been checked?

All attributes digitized during the creation process were verified by displaying the points in the database with respect to the USGS 7.5-minute topographic map, but no formal tests were performed.

  1. How accurate are the geographic locations?

The data were created on a USGS 7.5-minute topographic map at 1:24,000 scale. Therefore, the horizontal accuracy is assumed to be within National Map Accuracy Standards, with a horizontal accuracy of 45.6 feet at the 95% confidence level. Locational information in the field was provided by general purpose hand-held GPS receivers using the code correlation method.

  1. How accurate are the heights or depths?

The data were delineated on a USGS 7.5-minute topographic map at 1:24,000 scale. Therefore, the vertical accuracy is assumed to be within National Map Accuracy Standards, with a vertical accuracy of 11.9 feet at the 95% confidence level.

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

The point locations were delineated on a USGS 7.5-minute topographic map based on observations and GPS locations. The features in the database are not based on legal parcels or definitions.

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

These data are believed to be logically consistent, though no tests were performed.

How can someone get a copy of the data set?

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

Access_Constraints:

Although all data released in this report have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials and (or) the functioning of the software. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Use_Constraints: None

  1. Who distributes the data set? (Distributor 1 of 1)

U.S. Geological Survey - Information Services

1-888-ASK-USGS (voice)
ask@usgs.gov

Hours_of_Service: 0900 to 1700 mountain standard time

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

Downloadable Data

  1. What legal disclaimers am I supposed to read?
  2. How can I download or order the data?
    • Availability in digital form:

Data format:

(version 1.0) Size: 0.445

Network links:

<https://pubs.usgs.gov/sir/2005/5276/>
    • Cost to order the data: Internet data are free
    • Special instructions:

<https://pubs.usgs.gov/sir/2005/5276/>

Who wrote the metadata?

Dates:

Last modified: 21-Feb-2006

Metadata author:

Greg Walsh
U.S. Geological Survey
Geologist
P.O. Box 628
Montpelier, VT 05663
USA

802-828-4528 (voice)
802-828-4465 (FAX)
gwalsh@usgs.gov

Hours_of_Service: 0900 to 1700 Eastern Standard Time

Metadata standard:

FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)

Metadata extensions used:

·         <http://www.esri.com/metadata/esriprof80.html>

Generated by mp version 2.8.6 on Tue Jun 21 12:13:18 2005