Seafloor Elevation Change From 2004 to 2016 at Looe Key, Florida Keys

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Frequently anticipated questions:

What does this data set describe?

Title:
Seafloor Elevation Change From 2004 to 2016 at Looe Key, Florida Keys
Abstract:
The U.S. Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center conducted research to quantify bathymetric changes at Looe Key near Big Pine Key, Florida (FL), within a 16.4 square-kilometer area between 2004 and 2016. USGS staff used light detection and ranging (lidar)-derived data acquired by the U.S. Army Corps of Engineers (USACE) Joint Airborne Lidar Bathymetry Technical Center of eXpertise (JALBTCX) between December 1 and 31, 2004 (USACE-JALBTCX) and the National Oceanic and Atmospheric Administration (NOAA) between July 21 and November 21, 2016 (NOAA, 2017) to assess changes in seafloor elevation and structure that occurred during this time. An elevation change analysis between the 2004 USACE and 2016 NOAA lidar data was performed to quantify and map impacts to seafloor elevation and determine elevation and volume change statistics for ten habitat types found at Looe Key. Data were collected under Florida Keys National Marine Sanctuary permit FKNMS-2016-068.
Supplemental_Information:
The 2004 lidar data were collected by the USACE JALBTCX using the Compact Hydrographic Airborne Rapid Total Survey (CHARTS) system. The 2016 lidar data were collected by the NOAA National Geodetic Survey (NGS) Remote Sensing Division using a Riegl VQ-820-G system. The lidar data are an ancillary product of NOAA's Coastal Mapping Program (CMP), created through a wider Integrated Ocean and Coastal Mapping initiative to increase support for multiple uses of the data.
  1. How might this data set be cited?
    Yates, Kimberly K., Zawada, David G., Murphy, Kelly A., and Arsenault, Stephanie R., 20190821, Seafloor Elevation Change From 2004 to 2016 at Looe Key, Florida Keys: U.S. Geological Survey Data Release doi:10.5066/P9JTOOMB, U.S. Geological Survey, St. Petersburg, FL.

    Online Links:

    This is part of the following larger work.

    Yates, Kimberly K., Zawada, David G., Smiley, Nathan A., and Tiling-Range, Ginger, 20170420, Divergence of seafloor elevation and sea level rise in coral reef ecosystems: Biogeosciences, Munich, Germany.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -81.440068
    East_Bounding_Coordinate: -81.367746
    North_Bounding_Coordinate: 24.574091
    South_Bounding_Coordinate: 24.536433
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 01-Dec-2004
    Ending_Date: 21-Nov-2016
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: Multimedia presentation
  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 (4086712)
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 17
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -81.0
      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 0.6096
      Ordinates (y-coordinates) are specified to the nearest 0.6096
      Planar coordinates are specified in METERS
      The horizontal datum used is North American Datum of 1983 National Spatial Reference System (2007).
      The ellipsoid used is GRS_1980.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257222.
      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Datum_Name: North American Vertical Datum of 1988 (NAVD88) GEOID12B
      Altitude_Resolution: 0.2
      Altitude_Distance_Units: meters
      Altitude_Encoding_Method:
      Explicit elevation coordinate included with horizontal coordinates
  7. How does the data set describe geographic features?
    LooeKey_Elevation_Statistics.csv
    Looe Key elevation change statistics per habitat type from 2004 to 2016. (Source: USGS)
    Habitat types in Looe Key study site
    The habitat types found in the Looe Key study site. Habitat types are defined by the Unified Florida Reef Tract Map Version 2.0 and based on the Unified Classification (UC) system Class Level 2. (Source: Florida Fish and Wildlife Conservation Commission (FWC))
    ValueDefinition
    Total Study SiteThe total Looe Key study site, includes 10 habitat types.
    Aggregate ReefAggregate reef larger than 1 hectare (ha), contiguous reef, lacking sand channels.
    Colonized PavementContiguous to patchy pavement, lacking spur and groove channel formation, presence of macroalgae, hard coral, gorgonians, and other sessile invertebrates, dense enough to obscure underlying rock.
    Individual or Aggregated Patch ReefPatch reefs smaller than 1 ha, isolated reefs often with distinct halo or reef features covering >10% of the area.
    Not ClassifiedAreas where habitat has not been classified.
    PavementContiguous to patchy pavement, lacking spur and groove channel formations.
    Reef RubbleUnconsolidated, dead, unstable coral rubble.
    Seagrass ContinuousContinuous seagrass beds.
    Seagrass DiscontinuousDiscontinuous seagrass beds.
    Spur and GrooveAlternating linear sand and coral formations, perpendicular to reef crest.
    Unconsolidated SedimentUnconsolidated sediment.
    Total points (no.)
    The total number of points within or on the boundary of each Looe Key habitat type. (Source: USGS)
    Range of values
    Minimum:2101
    Maximum:4086712
    Units:number of points
    Mean elevation change (m)
    Mean elevation change per habitat type in the Looe Key study site from 2004 to 2016, in meters. (Source: USGS)
    Range of values
    Minimum:0.0679
    Maximum:0.4955
    Units:meters
    Mean elevation change SD (m)
    Standard deviation of the mean elevation change, in meters. (Source: USGS)
    Range of values
    Minimum:0.1265
    Maximum:0.282
    Units:meters
    Accretion points (no.)
    The total number of accretion points within or on the boundary of each Looe Key habitat type. (Source: USGS)
    Range of values
    Minimum:2101
    Maximum:3940304
    Units:number of points
    Max accretion (m)
    Maximum accretion per habitat type in the Looe Key study site from 2004 to 2016, in meters (Source: USGS)
    Range of values
    Minimum:0.6297
    Maximum:4.5873
    Units:meters
    Min accretion (m)
    Minimum accretion per habitat type in the Looe Key study site from 2004 to 2016, in meters (Source: USGS)
    Range of values
    Minimum:0
    Maximum:0.08269
    Units:meters
    Mean accretion (m)
    Mean accretion per habitat type in the Looe Key study site from 2004 to 2016, in meters. (Source: USGS)
    Range of values
    Minimum:0.1694
    Maximum:0.5136
    Units:meters
    Mean accretion SD (m)
    Standard deviation of the mean accretion, in meters. (Source: USGS)
    Range of values
    Minimum:0.1123
    Maximum:0.1966
    Units:meters
    Erosion points (no.)
    The total number of erosion points within or on the boundary of each Looe Key habitat type. (Source: USGS)
    Range of values
    Minimum:0
    Maximum:146408
    Units:number of points
    Max erosion (m)
    Maximum erosion per habitat type in the Looe Key study site from 2004 to 2016, in meters. (Source: USGS)
    Range of values
    Minimum:-3.1488
    Maximum:-0.6344
    Units:meters
    Min erosion (m)
    Minimum erosion per habitat type in the Looe Key study site from 2004 to 2016, in meters. (Source: USGS)
    Range of values
    Minimum:-0.000115
    Maximum:-0.000001
    Units:meters
    Mean erosion (m)
    Mean erosion per habitat type in the Looe Key study site from 2004 to 2016, in meters. (Source: USGS)
    Range of values
    Minimum:-0.2867
    Maximum:-0.1003
    Units:meters
    Mean erosion SD (m)
    Standard deviation of the mean erosion, in meters. (Source: USGS)
    Range of values
    Minimum:0.0938
    Maximum:0.3978
    Units:meters
    LooeKey_Volume_Statistics.csv
    Volume statistics by habitat type in Looe Key from 2004 to 2016. (Source: USGS)
    Habitat types in Looe Key study site
    The habitat types found in Looe Key. Habitat types are defined by the Unified Florida Reef Tract Map Version 2.0 and based on the Unified Classification (UC) system Class Level 2. (Source: FWC)
    ValueDefinition
    Total Study SiteThe total Looe Key study site, includes 10 habitat types.
    Aggregate ReefAggregate reef larger than 1 hectare (ha), contiguous reef, lacking sand channels.
    Colonized PavementContiguous to patchy pavement, lacking spur and groove channel formation, presence of macroalgae, hard coral, gorgonians, and other sessile invertebrates, dense enough to obscure underlying rock.
    Individual or Aggregated Patch ReefPatch reefs smaller than 1 ha, isolated reefs often with distinct halo or reef features covering >10% of the area.
    Not ClassifiedAreas where habitat has not been classified.
    PavementContiguous to patchy pavement, lacking spur and groove channel formations.
    Reef RubbleUnconsolidated, dead, unstable coral rubble.
    Seagrass ContinuousContinuous seagrass beds.
    Seagrass DiscontinuousDiscontinuous seagrass beds.
    Spur and GrooveAlternating linear sand and coral formations, perpendicular to the reef crest.
    Unconsolidated SedimentUnconsolidated sediment
    Habitat Area (km^2)
    Habitat area, in kilometers squared. (Source: USGS)
    Range of values
    Minimum:0.0087
    Maximum:16.3786
    Units:km^2
    Net erosion lower limit (10^6 m^3)
    Net erosion minimum volume per habitat, in millions of cubic meters. (Source: USGS)
    Range of values
    Minimum:0
    Maximum:0.021
    Units:10^6 m^3
    Net erosion upper limit (10^6 m^3)
    Net erosion maximum volume per habitat, in millions of cubic meters. (Source: USGS)
    Range of values
    Minimum:0
    Maximum:0.0711
    Units:10^6 m^3
    Net accretion lower limit (10^6 m^3)
    Net accretion minimum volume per habitat, in millions of cubic meters. (Source: USGS)
    Range of values
    Minimum:0.0002
    Maximum:3.2865
    Units:10^6 m^3
    Net accretion upper limit (10^6 m^3)
    Net accretion maximum value per habitat, in millions of cubic meters. (Source: USGS)
    Range of values
    Minimum:0.002
    Maximum:6.4769
    Units:10^6 m^3
    Net volume change lower limit (10^6 m^3 study area^-1)
    Net volume change lower limit per habitat, in millions of cubic meters per study area. (Source: USGS)
    Range of values
    Minimum:0.0001
    Maximum:3.2655
    Units:10^6 m^3 study area^-1
    Net volume change upper limit (10^6 m^3 study area^-1)
    Net volume change upper limit per habitat, in millions of cubic meters per study area. (Source: USGS)
    Range of values
    Minimum:0.0013
    Maximum:6.4058
    Units:10^6 m^3 study area^-1
    Area normalized volume change lower limit (10^6 m^3 km^-2)
    Area normalized volume change lower limit per habitat, in millions of cubic meters per kilometer squared. (Source: USGS)
    Range of values
    Minimum:0.0051
    Maximum:0.2963
    Units:10^6 m^3 km^-2
    Area normalized volume change upper limit (10^6 m^3 km^-2)
    Area normalized volume change upper limit per habitat, in millions of cubic meters per kilometer squared. (Source: USGS)
    Range of values
    Minimum:0.066
    Maximum:0.4959
    Units:10^6 m^3 km^-2

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Kimberly K. Yates
    • David G. Zawada
    • Kelly A. Murphy
    • Stephanie R. Arsenault
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    Kimberly K Yates
    Southeast Region: ST. PETE COASTAL & MARINE SCIENCE CENTER
    Research Oceanographer
    600 4Th Street South
    St. Petersburg, FL
    United States

    727-502-8059 (voice)
    kyates@usgs.gov

Why was the data set created?

These data were used to determine seafloor elevation and volume changes, from 2004 to 2016, at Looe Key, FL.

How was the data set created?

  1. From what previous works were the data drawn?
    2016 Looe Key lidar (source 1 of 3)
    National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), National Geodetic Survey (NGS), Remote Sensing Division, 20170914, 2016 NOAA NGS Topobathy Lidar DEM: Florida Keys Outer Reef Block 01: National Oceanic and Atmospheric Administration, Charleston, SC.

    Online Links:

    Type_of_Source_Media: topobathy data
    Source_Contribution:
    The original lidar data used to calculate elevation and volume change statistics for Looe Key from 2004 to 2016.
    2004 Looe Key lidar (source 2 of 3)
    U.S. Army Corps of Engineers, Joint Airborne Lidar Bathymetry Technical Center of eXpertise, Unpublished material, Looe Key, Florida 2004 Lidar Coverage: JALBTCX, Kiln, MS.

    Type_of_Source_Media: topobathy data
    Source_Contribution:
    The original lidar data used to calculate elevation and volume change statistics for Looe Key from 2004 to 2016. For users interested in obtaining the raw lidar point cloud or rasterized topobathymetry data, please contact the U.S. Army Corps of Engineers directly at, JALBTCX@usace.army.mil.
    Habitat file (source 3 of 3)
    Florida Fish and Wildlife Conservation Commission, Fish and Wildlife Research Institute, 20170113, Unified Florida Reef Tract Map Version 2.0: Fish and Wildlife Research Institute, St. Petersburg, FL.

    Online Links:

    Type_of_Source_Media: Vector digital data
    Source_Contribution:
    This shapefile was used to divide the DEM by habitat types using Unified Classification (UC) Class Level 2.
  2. How were the data generated, processed, and modified?
    Date: 2019 (process 1 of 13)
    Step 1:The original 2016 NOAA NGS Topography Lidar DEM: Florida Keys Outer Reef Block 01 tagged image file format (TIFF) DEM was downloaded from https://inport.nmfs.noaa.gov/inport/item/48373 using the "Customized Download" capability of NOAA’s DigitalCoast website. The data were downloaded with the following parameters: UTM Zone: Zone 17 Range 084W-078W; Horizontal Datum: NAD83; Horizontal Units: Meters; Vertical Datum: NAVD88; Vertical Units: Meters; File Format: Tiff 32-bit Float; Bin Method: TIN; Bin Size: 1.0; Bin Units: Meters; Data Classification: Bathymetric Lidar Points; Data Returns: Any Points; Ancillary Data: No Ancillary Data; and Geoid Name: GEOID12B. Using VDatum version 3.9, a publicly available software from NOAA (https://vdatum.noaa.gov/), the lidar TIFF was transformed from the North American Horizontal Datum of 1983 (NAD83) Universal Transverse Mercator (UTM) Zone 17 North to NAD83 National Spatial Reference System (NSRS2007) horizontal datum, the vertical datum and geoid model were kept the same.
    Date: 2019 (process 2 of 13)
    Step 2: The original Looe Key, Florida 2004 Lidar Coverage TIFF DEM was acquired (via file downloads from a secure server) directly from the U.S. Army Corps of Engineers. Horizontal coordinates (latitude and longitude, in decimal degrees) were provided in NAD83 and vertical positions were referenced to the NAD83 ellipsoid, in meters. Using VDatum version 3.9, the lidar TIFF was transformed from the NAD83 to the NAD83 (NSRS2007) horizontal datum, while the GEOID03 model was used to transform from ellipsoid to NAVD88 GEOID12B orthometric heights.
    Date: 2019 (process 3 of 13)
    Step 3: Using Esri ArcGIS Desktop Advanced version 10.6, footprints of the original 2004 and 2016 lidar TIFF's were created with the "Reclassify (Spatial Analyst)" tool in ArcToolbox. To create each raster file, all old data values were replaced with 1 and the 'No Data' value with 0 to create the raster files. Then, the "Raster to Polygon (Conversion)" tool was used to create a footprint of the original lidar data by converting the raster files to polygon shape (SHP) files.
    Date: 2019 (process 4 of 13)
    Step 4: Due to false returns, additional areas were removed from the 2016 lidar. Polygons encompassing the regions of error were created using Global Mapper 18.2 with the "Digitizer" tool and the 'Create Area/Polygon Features'. The polygons were exported as a single SHP file, see 2016_Lidar_EdgeEffects_Removed_Areas SHP file.
    Date: 2019 (process 5 of 13)
    Step 5: A polygon SHP file of the geometric intersection between the two lidar surveys was created with the "Intersect (Analysis)" tool by adding the two lidar footprint SHP files (Step 3) as 'Input features'. Additional areas were deleted from the Intersect_footprint SHP file because of lidar edge effects using the "Erase (Analysis)" tool by specifying the Intersect_footprint SHP file as the 'Input features' and the 2016_Lidar_EdgeEffects_Removed_Areas SHP file as the 'Erase Features'. Then, the two lidar TIFF's (Step 1, 2) were clipped to the extent of the Intersect_footprint SHP file using the "Clip (Data Management)" tool by specifying one of the lidar TIFF’s as the 'Input Raster', the Intersect_footprint SHP file as the 'Output Extent', and box checked for 'Use Input Features for Clipping Geometry', creating the 2004_LooeKey_Lidar_Clip TIFF and the 2016_LooeKey_Lidar_Clip TIFF.
    Date: 2019 (process 6 of 13)
    Step 6: A 2-m grid was created using the "Create Fishnet (Data Management)" tool with the following parameters: Template extent: Intersect_footprint SHP file (Step 5); Cell size width: 2; Cell size height: 2; Number of Rows: left blank, Number of Columns: left blank; Geometry type: POLYLINE and box checked for 'Create Label Points'. The 2-m grid label points SHP file was clipped to the extent of the Intersect_footprint SHP file using the "Clip (Analysis)" tool by specifying the 2-m grid label points SHP file as the 'Input features' and the Intersect_footprint SHP file as the 'Clip features.' XY coordinates were added to the 2-m grid SHP file using the "Add XY Coordinates (Data Management)" tool, to create the 2m_grid point SHP file.
    Date: 2019 (process 7 of 13)
    Step 7: Values from the 2004_LooeKey_Lidar_Clip TIFF (Step 5) and 2016_LooeKey_Lidar_Clip TIFF (Step 5) were extracted at the location of the 2m_grid points using the "Extract Values to Points (Spatial Analyst)" tool by specifying the 2m_grid point SHP file as the 'Input point features' and the 2004_Lidar_Clip TIFF as the 'Input', creating the Lidar_Extract_Points SHP file. This step was repeated with the Lidar_Extract_Points SHP file as the 'Input point features' and the 2016_LooeKey_Lidar_Clip TIFF as the 'Input', creating the LooeKey_IntersectPoints SHP file.
    Date: 2019 (process 8 of 13)
    Step 8: The elevation difference (Diff_m) between the 2016 lidar (RASTERVALU) and the 2004 lidar data (RASTERVA_1) were calculated by adding a field to the attribute table of the LooeKey_IntersectPoints SHP file using the "Field Calculator" and the expression Diff_m = [RASTERVALU] – [RASTERVA_1]. An additional point was removed from the LooeKey_IntersectPoints SHP file because it had a Diff_m value of 26.9, which was an outlier compared to the surrounding points.
    Date: 2019 (process 9 of 13)
    Step 9: The original Unified Florida Reef Tract Map version 2.0 SHP file was downloaded from http://ocean.floridamarine.org/IntegratedReefMap/UnifiedReefTract.htm. Using Esri ArcGIS, the original habitat SHP file was modified using the "Clip (Analysis)" tool to clip the habitat SHP file to the extent of the Intersect_footprint SHP file (Step 5) by specifying the habitat SHP file as the 'Input Features' and the Intersect_footprint SHP file as the 'Clip Features', creating the LooeKey_Habitat_Clip. Using the "Select by Attribute" tool, individual habitat SHP files were created from the LooeKey_Habitat_Clip SHP file using the "Select by Attribute" tool to select one ClassLv2 habitat and exporting as a separate SHP file.
    Date: 2019 (process 10 of 13)
    Step 10: Elevation change statistics were determined by habitat type using the XYZ points from the LooeKey_IntersectPoints SHP file. The "Select Layer by Location (Data Management)" tool was used to extract points within or on the boundary of a specific habitat type by using the following parameters: Input Feature Layer: LooeKey_IntersectPoints; Relationship: INTERSECT; Selecting Features: Habitat SHP file; Search Distance: left blank; and Selection type: NEW_SELECTION. An ArcMap model was created to automate the process, because these steps had to be repeated for 10 habitat types. Elevation change statistics from Looe Key were compiled by habitat type into a comma separated values (CSV) file using Microsoft Excel 2016, see LooeKey_Elevation_Statistics.csv. After analysis, no data values in the table were defined as "-".
    Date: 2019 (process 11 of 13)
    Step 11: An elevation change surface model was created using the "Create TIN (3D Analyst)" tool by specifying the LooeKey_IntersectPoints SHP file (Step 7) as the 'Input Feature Class', Diff_m as the 'Height Field' and Mass_Points as the 'Type', creating the Intersect_TIN file. Then, the Intersect_TIN file was delineated using the "Delineate TIN Data Area (3D Analyst)" tool by specifying the Intersect_TIN as the 'Input TIN', a 'Maximum Edge Length' of 2.828428 (hypotenuse of a 2-m grid) and the 'Method' set to ALL. The delineated Intersect_TIN was clipped to the extent of the Intersect_footprint SHP file (Step 5) using the "Edit TIN (3D Analyst)" tool with the following parameters: Input TIN: Intersect_TIN; Input Features Class: Intersect_footprint SHP file; Height Field: None, Tag Field: None; and Type: Hard clip.
    Date: 2019 (process 12 of 13)
    Step 12: In addition to elevation-change statistics, volume-change statistics per habitat type were calculated using the final TIN (Step 11). Surface volume changes were calculated for four cases using the "Surface Volume (3D Analyst)" tool. To calculate the net erosion lower limit (case 1) the 'Reference Plane' was set to BELOW and the 'Plane Height' set to -0.212 m. For the net erosion upper limit (case 2) the 'Reference Plane' was set to BELOW and the 'Plane Height' set to 0 m. For the net accretion lower limit (case 3) the 'Reference Plane' was set to ABOVE and the 'Plane Height' was set to 0.212 m. For the net accretion upper limit (case 4) the 'Reference Plane' was set to ABOVE and the 'Plane Height' was set to 0 m. A 0.212 m threshold was determined by vertical error analysis using the uncertainty for modern lidar (0.15 m) to calculate the Root Mean Square Error (RMSE) of 0.212 m. Minimum net volume was calculated by summing results from cases 1 and 3. Maximum net volume was calculated by summing results from cases 2 and 4. Area normalized volume change lower limit was calculated by dividing the minimum net volume change for each habitat by the habitat's total area. The area normalized volume change upper limit was calculated by diving the maximum net volume for each habitat by the habitat's total area. An ArcMap model was created to automate the process, because these steps had to be repeated for 10 habitat types. Volume change statistics from Looe Key were compiled by habitat type in CSV format using Microsoft Excel 2016, see LooeKey_Volume_Statistics.csv.
    Date: 13-Oct-2020 (process 13 of 13)
    Added keywords section with USGS persistent identifier as theme keyword. 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?

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

  1. How well have the observations been checked?
    Datasets were visually compared by USGS staff in Esri ArcGIS Desktop Advanced version 10.6 for identification of anomalous elevations or data inconsistencies.
  2. How accurate are the geographic locations?
    For the 2004 and 2016 lidar, the data positions were obtained using post-processed kinematic global positioning system (KGPS) methods. The horizontal accuracy of the 2004 data is better than plus or minus 0.75 meter (m); Quantitative Value: 0.75 m. The horizontal accuracy of the 2016 data is better than plus or minus 1.0 m; Quantitative Value: 1.0 m.
  3. How accurate are the heights or depths?
    For the 2004 and 2016 lidar, the data positions were obtained using post-processed KGPS methods. Data used to test the lidar were collected with static GPS observational equipment and compared against the published data. The vertical accuracy of the 2004 data is better than plus or minus 0.20 m; Quantitative Value: 0.20 m. The vertical accuracy of the 2016 data is better than plus or minus 0.15 m; Quantitative Value: 0.15 m.
  4. Where are the gaps in the data? What is missing?
    This dataset is considered complete for the information presented, as described in the abstract section. Users are advised to read the rest of the metadata record and Yates and others (2017) carefully for additional details.
  5. How consistent are the relationships among the observations, including topology?
    Data cover the area specified for this project, without any known issues.

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. The U.S. Geological Survey requests to be acknowledged as originator of these data in future products or derivative research.
  1. Who distributes the data set? (Distributor 1 of 1)
    Kimberly K. Yates
    Southeast Region: ST. PETE COASTAL & MARINE SCIENCE CENTER
    Research Oceanographer
    600 4Th Street South
    St. Petersburg, FL
    United States

    727-502-8059 (voice)
    kyates@usgs.gov
  2. What's the catalog number I need to order this data set?
  3. What legal disclaimers am I supposed to read?
    Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The USGS shall not be held liable for improper or incorrect use of the data described or contained herein. Any use of trade, firm, or product 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?

Who wrote the metadata?

Dates:
Last modified: 13-Oct-2020
Metadata author:
Kimberly K Yates
Southeast Region: ST. PETE COASTAL & MARINE SCIENCE CENTER
Research Oceanographer
600 4Th Street South
St. Petersburg, FL
United States

727-502-8059 (voice)
kyates@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/spcmsc/LooeKey_2004_to_2016_metadata.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:18:51 2021