SIR2012_5290_ACAD_SurveyedERMs

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Frequently anticipated questions:

What does this data set describe?

Title: SIR2012_5290_ACAD_SurveyedERMs
Abstract:
The U.S. Geological Survey (USGS) Saltmarsh project at Acadia National Park(ANP)involved surveying elevation reference marks (ERMs) and points on the marsh surface for 20 marshes in the study area. Vertical control was established using previously-published benchmarks and one base station that was not previously published. This feature class contains location, elevation, and names for the ERMs used to establish vertical control for the marsh points.
Supplemental_Information:
Geodatabase product of a USGS study funded by National Park Service Climate Change Response funding, NPS PMIS # 161531, "Inventory and Protection of Salt Marshes from Risks of Sea Level Rise at Acadia National Park, Maine", 2012.
The database layers are collectively termed "appendix 1" of the USGS SIR report. Database layers included in appendix 1 include: Surveyed benchmarks used in surveying exercise (SIR2012_5290_ACAD_SurveyedBMs); Surveyed marsh points used for quality control for LiDAR data (SIR2012_5290_ACAD_Surveyedmarshpoints); Surveyed elevation reference marks for each surveyed marsh (SIR2012_5290_ACAD_SurveyedERMs); Salt marshes inventoried for this study (SIR2012_5290_ACAD_Saltmarshpolys); Inundation lines for each marsh under 60 cm of sea level rise (SIR2012_5290_ACAD_Inundationlines); Potential barriers to migration of salt marshes (SIR2012_5290_ACAD_Potentialbarriers).
The inundation lines presented are in no way a prediction of whether marsh migration will actually occur, only indications of where land will be inundated and would therefore be available for migration under 60 cm. of sea level rise.
  1. How should this data set be cited?

    U.S. Geological Survey, Maine Water Science Center, Augusta, Maine, 2012, SIR2012_5290_ACAD_SurveyedERMs: U.S. Geological Survey, Augusta, Maine.

    Online Links:

    This is part of the following larger work.

    Nielsen, Martha G., and Dudley, Robert W., 2012, Estimates of Future Inundation of Salt Marshes in Response to Sea Level Rise in and Around Acadia National Park, Maine: U.S. Geological Survey Scientific Investigations Report SIR2012-5290, U.S. Geological Survey, Reston, Virginia.

    Online Links:

    Other_Citation_Details: XXX p.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -68.751374
    East_Bounding_Coordinate: -68.112956
    North_Bounding_Coordinate: 44.486092
    South_Bounding_Coordinate: 44.287125

  3. What does it look like?

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

    Beginning_Date: 12-Jul-2010
    Ending_Date: 28-Jul-2010
    Currentness_Reference: Currentness refers to when the ERMs were surveyed.

  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):

      • Point (20)

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

      The map projection used is NAD_1983_UTM_Zone_19N.

      Projection parameters:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -69.0
      Latitude_of_Projection_Origin: 0.0
      False_Easting: 500000.0
      False_Northing: 0.0

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.0001
      Ordinates (y-coordinates) are specified to the nearest 0.0001
      Planar coordinates are specified in meters

      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.

      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Datum_Name: North_American_Vertical_Datum_1988
      Altitude_Resolution: 1.0
      Altitude_Distance_Units: Meters
      Altitude_Encoding_Method: Attribute values

  7. How does the data set describe geographic features?

    Surveyed elevation reference marks (ERMs)
    Point features (Source: Esri)

    OBJECTID
    Internal feature number (Source: Esri)

    Sequential unique whole numbers that are automatically generated.

    SHAPE
    Feature geometry (Source: Esri)

    Coordinates defining the features

    Point_ID
    USGS field identification number of ERMs (Source: USGS)

    Unique alphanumeric identification number

    Northing_f
    Northing horizontal point coordinate in feet (Maine State Plane East 1801 Survey Feet coordinate system) (Source: Esri)

    Range of values
    Minimum:176003.5933
    Maximum:276501.7447
    Units:Feet

    Easting_ft
    Easting horizontal point coordinate in feet (Maine State Plane East 1801 Survey Feet coordinate system) (Source: Esri)

    Range of values
    Minimum:909065.8994
    Maximum:1113212.695
    Units:Feet

    Elevation_
    Vertical point coordinate in meters above NAVD88 (Source: USGS computed)

    Range of values
    Minimum:3.53
    Maximum:11.956
    Units:Meters above NAVD88

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?

    Produced in cooperation with the National Park Service. LiDAR data for the Northeast funded largely by USGS American Reinvestment and Recovery Act funds, and provided by the Maine Office of GIS (MEGIS). These data are in the public domain unless otherwise stated; please credit the USGS and the National Park Service in products derived from these data.

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

    Robert W. Dudley
    U.S. Geological Survey Maine Water Science Office
    Hydrologist
    196 Whitten Rd.
    Augusta, ME 04330

    207-622-8201 x115 (voice)
    207-622-8204 (FAX)
    rwdudley@usgs.gov

Why was the data set created?

ERM points were used as datum to survey elevations of marsh points.

How was the data set created?

  1. From what previous works were the data drawn?

    Bing maps imagery (source 1 of 1)
    USGS, 2010, Microsoft Bing Bird's eye imagery: Microsoft Corporation, Redmond, Washington.

    Online Links:

    Other_Citation_Details:
    Copyright 2010 DigitalGlobe, Image courtesy of USGS Copyright 2012 Microsoft Corporation
    Type_of_Source_Media: Online digital data
    Source_Scale_Denominator: 1200
    Source_Contribution:
    The Bing map server was used to verify positions of the ERMs after they were processed into a GIS datalayer.

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

    Date: 2010 (process 1 of 3)
    Technique used a Global Positioning System (GPS) receiver (base) on a survey monument having a known elevation. The base units received GPS signals from U.S. GPS satellites, computed a positional error, and broadcast the error to a second GPS receiver (rover) that occupied an ERM. Rover-unit occupation times ranged from 15 to 48 minutes with an average occupation time of 30 minutes. Rover receiver data were used in conjunction with base point elevation solutions to compute ERM elevations. ERM elevations were solved using the LGO 2.0 software. GEOID09 was the geoid model used to convert ellipsoid heights to orthometric heights above the North American Vertical Datum of 1988 (NAVD88).

    Date: 2010 (process 2 of 3)
    X, Y, and Z coordinates from the survey data were put in a text file and imported into ArcGIS and saved as a shapefile.

    Date: 2010 (process 3 of 3)
    Converted LGO elevation data in feet to meters (feet x .3048 = meters).

  3. 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 in the accompanying data layers were checked.

  2. How accurate are the geographic locations?

    Solutions of the surveyed locations using Leica GeoOffice (LGO) software relative to BMs. LGO output solution quality measured in standard deviation (StdDev). Vertical elevation: StdDev = 1.4 millimeters (mm); Horizontal elevation: StdDev = 0.8 mm

  3. How accurate are the heights or depths?

    Solutions of the surveyed locations using LGO software relative to BMs. LGO output solution quality measured in standard deviation. Vertical elevation: StdDev = 1.4 mm; Horizontal elevation: StdDev = 0.8 mm

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

    The data are complete.

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

    Data are internally consistent.

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:
No legal use constraints. Users must assume responsibility in determining the usability of these data for their purposes.

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

    U.S. Geological Survey
    Ask USGS -- Water Webserver Team
    445 National Center
    Reston, VA 20192
    USA

    1-888-275-8747 (1-888-ASK-USGS) (voice)
    <http://water.usgs.gov/user_feedback_form.html>

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

    Downloadable Data

  3. What legal disclaimers am I supposed to read?

    This database, identified as “SIR2012_5290_ACAD_SurveyedERMs”, has been approved for release and publication by the U.S. Geological Survey (USGS). Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the U.S. Government may be held liable for any damages resulting from its authorized or unauthorized use. The use of firm, trade, or brand names in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey. The names mentioned in this document may be trademarks or registered trademarks of their respective trademark owners.

  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 20-Dec-2012
Metadata author:
U.S. Geological Survey, New England Water Science Center, Maine Office
Hydrologist
196 Whitten Rd.
Augusta, ME 04330
USA

207-622-8201 (voice)
mnielsen@usgs.gov

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

Generated by mp version 2.9.20 on Wed Mar 13 14:37:54 2013