Sediment sample and textural properties at 40 sample locations collected by the U.S. Geological Survey in Moultonborough Bay, Lake Winnipesaukee, New Hampshire in 2005 (Geographic, WGS 84, Esri point shapefile, 2005-004-FA_SAMPLES.SHP)

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Frequently anticipated questions:


What does this data set describe?

Title:
Sediment sample and textural properties at 40 sample locations collected by the U.S. Geological Survey in Moultonborough Bay, Lake Winnipesaukee, New Hampshire in 2005 (Geographic, WGS 84, Esri point shapefile, 2005-004-FA_SAMPLES.SHP)
Abstract:
In freshwater bodies of New Hampshire, the most problematic aquatic invasive plant species is Myriophyllum heterophyllum or variable leaf water-milfoil. Once established, variable leaf water-milfoil forms dense beds that can alter the limnologic characteristics of a waterbody, impacting natural lacustrine communities and their habitats. Variable leaf water-milfoil infestations also disrupt recreational uses of waterbodies and have negatively affected swimming, boating, fishing, and property values in and around several lakes and ponds in New Hampshire.
In 1965, Moultonborough Bay, Lake Winnipesaukee became the first waterbody in New Hampshire where variable leaf water-milfoil was observed. Variable leaf water-milfoil is native to the Southeastern and Midwestern areas of the United States where more alkaline waters appear to limit the growth of this plant. Outside its native range, however, it adapts well to the relatively acidic, low-alkalinity, and nutrient-poor conditions of oligotrophic lakes and bays similar to Moultonborough Bay.
In 2005, the New Hampshire Department of Environmental Services (NHDES) collaborated with the U.S. Geological Survey to investigate the distribution (presence and density) of variable leaf water-milfoil in Moultonborough Bay. This study utilized geophysical systems and conventional water-quality measurements to identify lake-floor environments that may provide suitable habitat for the establishment and growth of variable leaf water-milfoil. The results of the study are intended to assist resource managers in federal and state agencies by providing methods for detecting variable leaf water-milfoil and for identifying areas susceptible to infestation. Ultimately, this information may lead to early detection, prevention, and more effective mitigation strategies.
Field activity information for this cruise is available on-line through the U.S. Geological Survey Coastal and Marine Geoscience Data System https://cmgds.marine.usgs.gov/fan_info.php?fa=2005-004-FA.
  1. How might this data set be cited?
    U.S. Geological Survey, 2014, Sediment sample and textural properties at 40 sample locations collected by the U.S. Geological Survey in Moultonborough Bay, Lake Winnipesaukee, New Hampshire in 2005 (Geographic, WGS 84, Esri point shapefile, 2005-004-FA_SAMPLES.SHP): data release DOI:10.5066/F71N7Z4H, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, Massachusetts.

    Online Links:

    This is part of the following larger work.

    Denny, J.F., Danforth, W.W., Worley, C.R., and Irwin, B.J., 2014, High-resolution geophysical and sample data collected in Moultonborough Bay, Lake Winnipesaukee, New Hampshire in 2005, USGS Field Activity 2005-004-FA: data release DOI:10.5066/F71N7Z4H, U.S. Geological Survey, Reston, VA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -71.390840
    East_Bounding_Coordinate: -71.359890
    North_Bounding_Coordinate: 43.728250
    South_Bounding_Coordinate: 43.712080
  3. What does it look like?
    https://cmgds.marine.usgs.gov/data/field-activity-data/2005-004-FA/data/samples/2005-004-FA_samples.jpg (JPEG)
    Image showing sediment sample locations where surface grab samples were collected in 2005 by the U.S. Geological Survey in Moultonborough Bay, Lake Winnipesaukee, New Hampshire, survey area.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 27-Jul-2005
    Ending_Date: 28-Jul-2005Currentness_Reference: ground condition
  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 (42)
    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 0.000001. Longitudes are given to the nearest 0.000001. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257224.
  7. How does the data set describe geographic features?
    2005-004-FA_samples
    Sample locations and textural information for sediment samples collected by the U.S. Geological Survey in Moultonborough Bay, Lake Winnipesaukee, New Hampshire in 2005. (Source: U.S. Geological Survey)
    FID
    Internal feature number. (Source: Esri) Sequential unique whole numbers that are automatically generated.
    Shape
    Feature geometry. (Source: Esri) Coordinates defining the features.
    STATION
    Unique identification for the sample locations used during data collection and processing. A and B , at locations 1 and 7, indicate two sub-samples were collected from the acquired sample. A represents a sub-sample collected at 0 to 2 cm depth; B represents a sub-sample collected at 2 to 10 cm depth within the sample. (Source: U.S. Geological Survey) Original sample information recorded in the field. Format: ST1, where 'ST' is station, and '1' is the station number.
    CRUISE
    Unique USGS Cruise Identification. (Source: U.S. Geological Survey) Unique USGS Cruise identification used in 2005. Format: ShipNameYearCollectedCruiseIDNumber. RAFA05004, where RAFA describes the USGS R/V Rafael; 05 is the year of data collection (2005), and 004 represents the USGS field identifier.
    MONTH
    Month the sediment sample was analyzed in the USGS Sediment laboratory. The number reflects the month in the year where 8 is August and 9 is September. The nodata value is -9999. (Source: U.S. Geological Survey)
    Range of values
    Minimum:8
    Maximum:9
    Units:month
    DAY
    Day of the month samples were analyzed in the USGS Sediment laboratory. The nodata value is -9999. (Source: U.S. Geological Survey)
    Range of values
    Minimum:1
    Maximum:31
    Units:day
    YEAR
    Year sediment samples were analyzed in the USGS sediment laboratory, 2005. (Source: U.S. Geological Survey)
    Range of values
    Minimum:2005
    Maximum:2005
    Units:year
    LATITUDE
    Y coordinate representing the location of sample (WGS84) (Source: U.S. Geological Survey)
    Range of values
    Minimum:43.71208
    Maximum:43.72825
    LONGITUDE
    X-coordinate representing location of sediment sample (WGS 84) (Source: U.S. Geological Survey)
    Range of values
    Minimum:-71.39084
    Maximum:-71.35989
    SAMPDEV
    Sample device used to acquire the sediment samples. (Source: U.S. Geological Survey) Sample devised used where VV is Van Veen grab sampler. -9999 is no data (no sample collected)
    LOCATION
    Geographic location (place name) of USGS field activity. (Source: U.S. Geological Survey) Geographic Location, where NH is New Hampshire.
    DEPTH_M
    Water depth in meters. (Source: U.S. Geological Survey)
    Range of values
    Minimum:2
    Maximum:15.5
    Units:meters
    T_DEPTH_CM
    Top depth of the sub-sample collected from the whole grab sample, in centimeters. (Source: U.S. Geological Survey)
    Range of values
    Minimum:0
    Maximum:2
    Units:centimeters
    B_DEPTH_CM
    Bottom depth of subsample collected from whole grab sample, in centimeters (Source: U.S. Geological Survey)
    Range of values
    Minimum:2
    Maximum:10
    Units:centimeters
    SAMWGT_G
    Dry mass (grams) of sample used in analysis. -9999 is no data (no sample collected) (Source: U.S. Geological Survey)
    Range of values
    Minimum:6.9547
    Maximum:39.6597
    Units:grams
    SAND
    Percent sand in sample. -9999 is no data (no sample collected) (Source: U.S. Geological Survey)
    Range of values
    Minimum:0.42
    Maximum:97.15
    Units:percent
    GRAVEL
    Percent gravel in sample. -9999 is no data (no sample collected) (Source: U.S. Geological Survey)
    Range of values
    Minimum:0
    Maximum:38.81
    Units:percent
    SILT
    Percent silt in sample. -9999 is no data (no sample collected) (Source: U.S. Geological Survey)
    Range of values
    Minimum:1.78
    Maximum:80.25
    Units:percent
    CLAY
    Percent clay in sample. -9999 is no data (no sample collected) (Source: U.S. Geological Survey)
    Range of values
    Minimum:0.23
    Maximum:24.6
    Units:percent
    DESC_
    Descriptive size classification according Shepard (1954) ternary classification system, as modified by Schlee, 1973). -9999 is no data (no sample collected) (Source: U.S. Geological Survey)
    ValueDefinition
    SandSediment grain size < 2mm and > 0.0062 mm
    Gravel > 10%Sediment grain size > 2mm and < 64 mm
    Silty SandSediment containing 50 - 75% sand, < 20% clay, 25 - 50% silt.
    Sandy SiltSediment containing 50 - 75% silt, < 20 % clay, 25 - 50% sand.
    Clayey SiltSediment containing 50 - 75% silt, < 20% sand, 25 - 50% clay.
    SiltSediment grain size > 0.062 mm and < 0.004 mm
    Silty SandSediment contains 50 - 75% sand, < 20% clay, 25 - 50% silt.
    Sandy SiltSediment contains 50 - 75% Silt, < 20% clay, 25 - 50% sand
    -9999No data
    MEDIAN
    median size of sample (phi) - the midpoint in the grain-size distribution of the sample. -9999 is no data (no sample collected) (Source: U.S. Geological Survey)
    Range of values
    Minimum:-0.4
    Maximum:6.79
    Units:phi
    MEDIAN_MM
    median of sample (mm) - the midpoint in the grain-size distribution of the sample. -9999 is no data (no sample collected) (Source: U.S. Geological Survey)
    Range of values
    Minimum:0.01
    Maximum:1.32
    Units:millimeters
    MEAN
    Mean of sample (phi) - mathmatical average of partical sizes in sediment sample. -9999 is no data (no sample collected) (Source: U.S. Geological Survey)
    Range of values
    Minimum:-0.24
    Maximum:6.85
    Units:phi
    MEAN_MM
    mean of sample (mm) - mathmatical average of partical sizes in sediment sample. -9999 is no data (no sample collected) (Source: U.S. Geological Survey)
    Range of values
    Minimum:0.01
    Maximum:1.18
    Units:millimeters
    STDDEV
    standard deviation of sample (phi) - statistical measure representing sorting of the sediment sample. Very well sorted < 0.35; well sorted 0.35 to 0.5; moderately well sorted 0.5 to 0.71; moderately sorted 0.71 to 1.0; poorly sorted 1 to 2; very poorly sorted 2 to 4. extremely poorly sorted > 4. -9999 is no data (no sample collected). (Source: U.S. Geological Survey)
    Range of values
    Minimum:0.86
    Maximum:3.33
    Units:phi
    SKEWNESS
    skewness of sample (unitless measure) - a measure of sorting in the 'tails' of a grain-size population, where positive values show an excess of fine-grained sediments and negative values show an excess of coarse-grained sediments. -9999 is no data (no sample collected) (Source: U.S. Geological Survey)
    Range of values
    Minimum:-0.53
    Maximum:2.06
    Units:unitless
    KURTOSIS
    Kurtosis of sample (unitless) - a measure of the peakedness of the probability distribution. -9999 is no data (no sample collected) (Source: U.S. Geological Survey)
    Range of values
    Minimum:-1.06
    Maximum:25.81
    Units:unitless
    MODE1
    Mode 1 class - First mode (particle size that occurs the most number of times) in phi units. -9999 is no data (no sample collected) (Source: USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:-0.5
    Maximum:7.5
    Units:phi
    MODE1_FREQ
    Mode 1 strength - Modal strength of the first mode in percent. -9999 is no data (no sample collected) (Source: USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:12.06
    Maximum:75.96
    Units:percent
    MODE2
    Mode 2 class - Second mode in phi units. -9999 is no data (no sample collected) (Source: USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:-3.5
    Maximum:5.5
    Units:phi
    MODE2_FREQ
    Mode 2 strength - Modal strength of the second mode in percent. -9999 is no data (no sample collected) (Source: USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:0
    Maximum:18.32
    Units:percent
    MODE3
    Mode 3 class - Third mode in phi units. -9999 is no data (no sample collected) (Source: USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:0
    Maximum:5.5
    Units:phi
    MODE3_FREQ
    Mode 3 strength - Modal strength of the third mode in percent. -9999 is no data (no sample collected) (Source: USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:0
    Maximum:5.65
    Units:percent
    MODES
    Number of modes. -9999 is no data (no sample collected) (Source: USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:1
    Maximum:3
    11PHI
    Cumulative Frequency Percent of the sample in the 11 phi fraction (nominal diameter of particles greater than or equal to 0.5 µm, but less than 0.001 mm); fine clay. -9999 is no data (no sample collected) (Source: U.S. Geological Survey)
    Range of values
    Minimum:99.98
    Maximum:100.00
    Units:phi
    10PHI
    Cumulative Frequency Percent of the sample in the 10 phi fraction (nominal diameter of particles greater than or equal to 0.001 mm, but less than 0.002 mm); medium clay. -9999 is no data (no sample collected) (Source: U.S. Geological Survey)
    Range of values
    Minimum:98.1
    Maximum:99.98
    Units:phi
    9PHI
    Cumulative Frequency Percent of the sample in the 9 phi fraction (nominal diameter of particles greater than or equal to 0.002 mm, but less than 0.004 mm); coarse clay. -9999 is no data (no sample collected) (Source: U.S. Geological Survey)
    Range of values
    Minimum:90.37
    Maximum:99.91
    Units:phi
    8PHI
    Cumulative Frequency Percent of the sample in the 8 phi fraction (nominal diameter of particles greater than or equal to 0.004 mm, but less than 0.008 mm); very fine silt. -9999 is no data (no sample collected) (Source: U.S. Geological Survey)
    Range of values
    Minimum:75.4
    Maximum:99.77
    Units:phi
    7PHI
    Cumulative Frequency Percent of the sample in the 7 phi fraction (nominal diameter of particles greater than or equal to 0.008 mm, but less than 0.016 mm); fine silt. -9999 is no data (no sample collected) (Source: U.S. Geological Survey)
    Range of values
    Minimum:54.57
    Maximum:99.53
    Units:phi
    6PHI
    Cumulative Frequency Percent of the sample in the 6 phi fraction (nominal diameter of particles greater than or equal to 0.016 mm, but less than 0.031 mm); medium silt. -9999 is no data (no sample collected) (Source: U.S. Geological Survey)
    Range of values
    Minimum:32.11
    Maximum:99.12
    Units:phi
    5PHI
    Cumulative Frequency Percent of the sample in the 5 phi fraction (nominal diameter of particles greater than or equal to 0.031 mm, but less than 0.0625 mm); coarse silt. -9999 is no data (no sample collected) (Source: U.S. Geological Survey)
    Range of values
    Minimum:8.41
    Maximum:98.48
    Units:phi
    4PHI
    Cumulative Frequency Percent of the sample in the 4 phi fraction (nominal diameters of particles greater than or equal to .0625 mm, but less than 0.125 mm); very fine sand. -9999 is no data (no sample collected) (Source: U.S. Geological Survey)
    Range of values
    Minimum:0.42
    Maximum:97.99
    Units:phi
    3PHI
    Cumulative Frequency Percent of the sample in the 3 phi fraction (nominal diameter of particles greater than or equal to 0.125 mm, but less than 0.25 mm); fine sand. -9999 is no data (no sample collected) (Source: U.S. Geological Survey)
    Range of values
    Minimum:0.2
    Maximum:96.8
    Units:phi
    2PHI
    Cumulative Frequency Percent of the sample in the 2 phi fraction (nominal diameter of particles greater than or equal to 0.25 mm, but less than 0.5 mm); medium sand. -9999 is no data (no sample collected) (Source: U.S. Geological Survey)
    Range of values
    Minimum:0.08
    Maximum:89.27
    Units:phi
    1PHI
    Cumulative Frequency Percent of the sample in the 1 phi fraction (nominal diameter of particles greater than or equal to 0.5 mm, but less than 1 mm); coarse sand. -9999 is no data (no sample collected) (Source: U.S. Geological Survey)
    Range of values
    Minimum:0.02
    Maximum:73.57
    Units:phi
    0PHI
    Cumulative Frequency Percent of the sample in the 0 phi fraction (nominal diameters of particles greater than or equal to 1 mm, but less than 2 mm); very coarse sand. -9999 is no data (no sample collected) (Source: U.S. Geological Survey)
    Range of values
    Minimum:0.0
    Maximum:57.47
    Units:phi
    NEG1PHI
    Cumulative Frequency Percent of the sample in the -1 phi fraction (nominal diameter of particles greater than or equal to 2 mm, but less than 4 mm); very fine pebbles (granules). -9999 is no data (no sample collected) (Source: U.S. Geological Survey)
    Range of values
    Minimum:0.0
    Maximum:38.81
    Units:phi
    NEG2PHI
    Cumulative Frequency Percent of the sample in the -2 phi fraction (nominal diameter of particles greater than or equal to 4 mm, but less than 8 mm); fine pebbles. -9999 is no data (no sample collected) (Source: U.S. Geological Survey)
    Range of values
    Minimum:0.0
    Maximum:27.39
    Units:phi
    NEG3PHI
    Cumulative Frequency Percent of the sample in the -3 phi fraction (nominal diameter of particles greater than or equal to 8 mm, but less than 16 mm); medium pebbles. -9999 is no data (no sample collected) (Source: U.S. Geological Survey)
    Range of values
    Minimum:0.0
    Maximum:15.62
    Units:phi
    NEG4PHI
    Cumulative Frequency Percent of the sample in the -4phi fraction (nominal diameter of particles greater than or equal to 16 mm, but less than 32 mm); coarse pebbles. -9999 is no data (no sample collected) (Source: U.S. Geological Survey)
    Range of values
    Minimum:0.0
    Maximum:0.0
    Units:phi
    NEG5PHI
    Cumulative Frequency Percent of the sample in the -5 phi fraction (nominal diameter of particles greater than or equal to 32 mm, but less than 64 mm); very coarse pebbles. -9999 is no data (no sample collected) (Source: U.S. Geological Survey)
    Range of values
    Minimum:0.0
    Maximum:0.0
    Units:phi

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    Jane F. Denny
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, Massachusetts
    USA

    508-548-8700 x 2311 (voice)
    508-457-2310 (FAX)
    jdenny@usgs.gov

Why was the data set created?

This data set includes the locations and identifiers of surficial sediment samples and grain-size descriptions of surficial sediment samples collected at 40 sample locations within Moultonborough Bay, Lake Winnipesaukee, New Hampshire during USGS field activity 2005-004-FA. The sediment samples were collected to ground-truth geophysical data in order to characterize the surficial sediment distribution and habitat of the lakefloor.

How was the data set created?

  1. From what previous works were the data drawn?
    none (source 1 of 1)
    U.S. Geological Survey, Unpublished Material, Sediment Textural Data.

    Type_of_Source_Media: online
    Source_Contribution:
    The Mini SEABOSS was designed specifically for the USGS Woods Hole Science Center's 26-foot research vessel Rafael. This system is equipped with two video cameras, a digital still camera, and a Van Veen grab sampler. This system, weighing approximately 200 lbs., can be used to depths up to 40 meters. The grab itself is raised and lowered with a 3/16-inch Aramid fiber winch-line with a breaking strength of 5,600 pounds. The davit is secured when the Mini SEABOSS is in the water. The electrical cable is on a spring-wound take-up reel with electrical slip rings that is mounted aft of the sampler. This arrangement protects the 0.38-in. multi-conductor cable and keeps the Mini SEABOSS correctly oriented with the boat. This multi-conductor cable enables communication between the ship's lab and the Mini SEABOSS system. The digital camera, a Minolta Dimage 7Hi, is mounted in a machined Delrin housing with a flat port and is set for 2560 x 1920 pixel images at the "fine" setting for compression. This allows the camera to be used for over 200 images with a 1 GB Compact Flash card without downloading. The system also has a 50 Watt/second flash unit powered by 8 AA batteries. Two battery-powered lasers are set 15 cm apart for scale measurements. The red laser dots can usually be seen in the photo depending on the bottom type and the distance to the sea floor. A third battery powered laser is positioned at an angle so that when it intersects the other lasers, the Mini SEABOSS is at the optimum height off the bottom for a still photograph (optimal height is generally 75 cm above the bottom). The camera is set to a manual focus and set to a default focus distance (50 cm) once the camera is powered up. The default focus distance is slightly less than the optimum height above the seafloor to account for optical distortion under water.
    Video images were collected at 40 sample locations and digital photographs were collected at 36 of the 40 sample locations using the USGS Mini SEABOSS (Blackwood and Parolski, 2001). The sample locations were selected based on variation in the acoustic backscatter within the sidescan-sonar mosaic, with the objective of characterizing broad areas of different backscatter intensity. With the Mini SEABOSS deployed, the research vessel was allowed to drift with occasional power from the vessel to control drift direction. Video was collected over a total of 696 meters of lakefloor. Video drift position was derived from the HYPACK navigation files based on the start and end times of the drift. For some portions of the drift, there was no navigation, so the position was derived from the time and position in the video at 30-s intervals. Latitude and Longitude for sample locations 1 and 8 were derived solely from the video as HYPACK files were not saved to disk at these sample locations. Bottom photographs were generally taken immediately prior to collecting a sediment sample with the SEABOSS. A unique navigation position was not recorded when the bottom photographs were collected, however the time of photo collection was recorded.
    Grab samples of the surficial sediment were collected at 39 of the 40 sample locations, typically at the end of a drift. Sample location 26 was not sampled, as the sediment was too coarse to successfully sample (boulders). However, bottom photographs and video were collected. The upper 2 cm of sediment was scraped from the surface of sediment samples for texture analysis. At sample locations 1 and 7, two sub-samples were collected due to the apparent bi-modal nature of the lakefloor and sample. One sub-sample was collected from the upper 2 cm, and the 2nd sub-sample was collected from the base of the sample (2 to 10 cm depth). (Two individual sites were occupied at Station 1, whereas only one site was occupied at Station 7. The one sample collected at Station 7 was subsequently sub-sampled).
    A total of 41 bottom samples were submitted for grain-size analysis. Grain-size analysis was performed at the USGS Sediment Laboratory at WHCMSC using methods described by Poppe and others (2005).
    Note: A small bit of water entered the camera housing during survey operations. This is reflected as a blurred 'dot' on the bottom photographs. The camera remained operational and data collection continued despite the 'water mark'.
  2. How were the data generated, processed, and modified?
    Date: 2005 (process 1 of 4)
    Grab samples were collected with the mini SEABOSS (Blackwood and Parolski, 2001) at thirty-nine sample locations in Moultonborough Bay, Lake Winnipesaukee, New Hampshire, 2005. Forty sample locations were occupied, but one location was too coarse to sample.
    The upper 2 cm of sediment was scraped from the surface of the sample for texture analysis. At sample locations 1 and 7, two sub-samples were collected due to the apparent bi-modal nature of the lakefloor and sample. One sub-sample was collected from the upper 2 cm, and the 2nd sub-sample was collected from the base of the sample (2 to 10 cm depth). (Two locations (sample sites) were occupied at Station 1, and one location (sample site) was occupied at Station 7).
    Forty-one samples in total were submitted for grain-size analysis to the USGS Sediment Laboratory at the Woods Hole Coastal and Marine Science Center using methods described by Poppe and others (2005).
    This and all subsequent processing steps were conducted by Jane F. Denny. Person who carried out this activity:
    Jane F. Denny
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, Massachusetts
    USA

    508-548-8700 x2311 (voice)
    508-457-2310 (FAX)
    jdenny@usgs.gov
    Date: 2005 (process 2 of 4)
    Results from the grain-size analysis were delivered in a Microsoft 2004 Excel spreadsheet. The spreadsheet was saved as a comma separated value (*csv) file.
    The *csv file was edited to add a placeholder for sample location 26, as there was no sediment sample collected at this sample location due to the coarse sediment on the lakefloor (boulders).
    Date: 2005 (process 3 of 4)
    The *csv file was imported to ArcGIS 9.0 using Tools- Add XY data. An event theme was created. The event theme was saved as a shapefile and the projection was defined as Geographic Coordinate System, WGS 84.
    Date: 06-Apr-2017 (process 4 of 4)
    The online links to the data were updated to reflect the new server hosting the data. Additionally, other small edits could be made to the metadata, such as modifying http to https where appropriate. The metadata date (but not the metadata creator) was edited to reflect the date of these changes. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
  3. What similar or related data should the user be aware of?
    Argue, Denise M., Kiah, Richard G., Denny, Jane F., Deacon, Jeffrey R., Danforth, William W., Johnston, Craig M., and Smagula, Amy P., 2007, Relation of Lake-Floor Characteristics to the Distribution of Variable Leaf Water-Milfoil in Moultonborough Bay, Lake Winnipesaukee, New Hampshire, 2005: Scientific Investigations Report 2007-5125, U.S. Geological Survey, Reston, Virginia.

    Online Links:

    Blackwood, D., and Parolski, K., 2001, Seabed observation and sampling system: Sea Technology v. 42, no. 2, p. 39-43, Sea Technology, Arlington, Virginia.

    Poppe, L.J., Williams, S.J., and Paskevich, V.F., 2005, USGS East-Coast Sediment Analysis Procedures, Database, and GIS Data: Open-File Report 2005-1001, U.S. Geological Survey, Reston, Virginia.

    Online Links:

    Schlee, J., 1973, Atlantic continental shelf and slope of the United States -- sediment texture of the northeastern part: Professional Paper 529-L, U.S. Geological Survey, Reston, Virginia.

    Online Links:

    Shepard, F.P., 1954, Nomenclature based on sand-silt-clay ratios: Journal Sedimentary Petrology: Journal of Sedimentary Petrology v. 24, p. 151-158, Society for Sedimentary Geology, Tulsa, Oklahoma.


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

  1. How well have the observations been checked?
    All attributes were evaluated during data processing as standard quality control to ensure attributes contain accurate and relevant information and values.
  2. How accurate are the geographic locations?
    Navigation was acquired with Wide Area Augmentation System ( WAAS), which is accurate to + or - 1 to 2 meters, horizontally. Navigation data were acquired with a Communications Systems International (CSI), Inc. LGBX Pro receiver. The CSI LGBX Pro received positions from a WAAS antenna located on the port, aft roof of the R/V Rafael cabin. WAAS positions were recorded within HYPACK (www.hypack.com) navigation software. Offsets between the DGPS antenna and the mini-SEABOSS were not measured. The horizontal position of the mini-SEABOSS during sample collection is assumed to be +/- 10 meters at best, due to a lack of precise positional data at the time of sample recovery.
  3. How accurate are the heights or depths?
    The depth values were collected from the hull-mounted echo-sounder on the R/V Rafael. No corrections were made to these data for draft, vessel motion, etc. Vertical accuracy is assumed to be + or - 0.5 meters.
  4. Where are the gaps in the data? What is missing?
    Forty sample locations were occupied during the survey, however sediment samples were collected from only thirty-nine locations. One location (sample location 26) contained primarily large boulders and was too coarse to sample with the mini-SEABOSS. However, bottom photographs and video data were collected at this location. All forty sample locations are included in this shapefile. At sample locations 1 and 7, two sediment samples were collected for analysis due to the apparent bi-modal nature of the lakefloor and samples. At station 1, two unique sample locations were occupied in close proximity. At Station 7, one location was occupied and the sediment sample was sub-sampled. Station1A was sub-sampled in the upper 2 cm of the sample. At Station 1B, a sub-sample was collected at a depth of 2 - 10 cm. At Station 7, one sub-sample was collected from the upper 2 cm and the 2nd from the base of the sample (2 to 10 cm depth). All samples were submitted for analysis to the USGS sediment laboratory, resulting in 41 sediment samples analyzed for textural properties.
  5. How consistent are the relationships among the observations, including topology?
    All sample data were collected with the mini-SEABOSS (SEABed Observation and Sampling System) by the U.S. Geological Survey in Moultonborough Bay, Lake Winnipesaukee, New Hampshire in 2005. The mini-SEABOSS is configured with a Van-Veen grab sampler to collect sediment samples of the lakefloor, and video and still cameras to collect bottom video and photographs of the lakefloor prior to collecting the physical sediment sample.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: None.
Use_Constraints:
Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the dataset.
  1. Who distributes the data set? (Distributor 1 of 1)
    Jane F. Denny
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, Massachusetts
    USA

    508-548-8700 x2311 (voice)
    508-457-2310 (FAX)
    jdenny@usgs.gov
  2. What's the catalog number I need to order this data set? The file 2005-004-FA_samples.zip contains the shapefile 2005-004-FA_samples.shp and other files associated with the shapefile. In addition to the shapefile, the zip file also contains the data in CSV format (2005-004-FA_samples.csv), the browse graphic (2005-004-FA_samples.jpg) and the FGDC CSDGM metadata in the following formats: XML, HTML, FAQ and text.
  3. What legal disclaimers am I supposed to read?
    Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  4. How can I download or order the data?
  5. What hardware or software do I need in order to use the data set?
    This zip file contains data available in Esri shapefile format. The zip file also contains associated metadata. The user must have ArcGIS or ArcView 3.0 or greater software to read and process the data file. In lieu of ArcView or ArcGIS, the user may utilize another GIS application package capable of importing the data. A free data viewer, ArcGIS Explorer, capable of displaying the data is available from Esri at www.esri.com.

Who wrote the metadata?

Dates:
Last modified: 06-Apr-2017
Metadata author:
Jane F. Denny
U.S. Geological Survey
Geologist
384 Woods Hole Road
Woods Hole, Massachusetts
USA

508-548-8700 x2311 (voice)
508-457-2310 (FAX)
jdenny@usgs.gov
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)

Generated by mp version 2.9.36 on Thu Apr 06 15:25:04 2017