Seamless Bathymetry Grid of Ninigret Pond

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Mike Bradley
Publication_Date: 20080506
Title: Seamless Bathymetry Grid of Ninigret Pond
Geospatial_Data_Presentation_Form: raster digital data
Publication_Information:
Publisher: MapCoast
Online_Linkage: www.mapcoast.org
Description:
Abstract:
A seamless elevation grid of Ninigret Pond and vicinity. The grid includes both subtidal, intertidal and terrestrial elevations
Purpose:
Soil survey and resource inventory of shallow water habitats of Rhode Island.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Currentness_Reference: ground condition
Status:
Progress: Planned
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -71.701235
East_Bounding_Coordinate: -71.624541
North_Bounding_Coordinate: 41.389793
South_Bounding_Coordinate: 41.341958
Keywords:
Theme:
Theme_Keyword_Thesaurus: digital elevation model, terrain model, seamless grid
Theme_Keyword: Bathymetry and Elevation
Theme:
Theme_Keyword_Thesaurus:
REQUIRED: Reference to a formally registered thesaurus or a similar authoritative source of theme keywords.
Theme_Keyword: elevation
Theme_Keyword: bathymetry
Theme_Keyword: grid format
Theme_Keyword: MapCoast
Access_Constraints: NONE
Use_Constraints: Not to be used for navigation or re-sold, re-used for profit.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Mike Bradley
Contact_Organization: MapCoast
Contact_Address:
Address_Type: mailing and physical address
Address: University of Rhode Island
Address: 105 Coastal Institute Kingston
City: Kingston
State_or_Province: RI
Postal_Code: 02881
Country: USA
Contact_Voice_Telephone: 401-874-5054
Contact_Electronic_Mail_Address: mike@edc.uri.edu
Browse_Graphic:
Native_Data_Set_Environment:
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.5.1450
Data_Quality_Information:
Completeness_Report:
DEM may be updated as newer elevation and bathymetry datasets become available
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report: +/- 1m
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
Procedure: The merged fathometer and RTK data were split into two groups. 90% of the points were randomly selected from the full dataset and the remaining 10% were set aside as a validation dataset. A new TIN was created from the 90% random subset of points and from the TIN a new grid was built. A grid was created from the validation points and the true depth at each one of these validation locations was subtracted from the predicted depth in the grid created from the 90% subset of points. The difference between the validation dataset and the 90% subset grid is our estimate of the accuracy of the Ninigret pond bathymetric data. The average difference between measured depth and our bathymetric grid was 0.25 feet. 90% of all the depths were within 0.5ft of true depth.
Lineage:
Source_Information:
Process_Step:
Process_Description:
Data from multple sources was used to create grid. RIDOT, NOAA Lidar, RTK elevations, and bathymetry collected by Emily Shumchenia and Kathyrn Ford were all used to create an ESRI TIN of the data. Details on Bathymetry Data: Kathyrn Ford (KF) collected 54,514 soundings. Depth was measured by a Garmin 240 Blue (in feet) registered to NAVD88. Tide correction was done using Hypack 2.12A Gold software. Tide corrections were based on Hypack analysis of three tide gauges placed in Ninigret by NRCS for the survey. Transducer correction is based on the depth of transducer below the hull plus an assumed squat of the boat of one inch. XY locations were obtained with a Trimble DSM212L DGPS receiver with sub-meter accuracy. Data were provided in RI State Plane feet NAD83 to P. August (PA) in an Excel spreadsheet. PA eliminated 8 soundings with aberrant depths and 395 sounding with aberrant XY locations. Excel coordinates were converted to an Arc shapefile with ArcView 3.3 and converted to a coverage with Arc 8.3. The attribute DEPTH2 is the depth in feet of KF's soundings after correcting for tidal influence. Futher field checks also eliminated a handfull of incorrect points. Shallow water depths were also measured with a RTK GPS. All data are included in the raw data file below. A TIN was created using the 54,111 bathymetric soundings and a hard breakline (depth = 0) consisting of the wetline from the 1997 RIGIS orthophotos. The TIN was converted to a GRID (30 foot pixel size). Land from the 1997 wetline RIGIS dataset was used as a mask to set all land-based pixels to NODATA. The bathymetric GRID was smoothed by applying a 3 pixel radius averaging filter and 1 foot contours created from the smoothed bathymetric GRID. The smoothed contours are shown and can be downloaded. VALIDATION PROCESS: The processing was repeated as described above using 44,912 points from the original bathymetric dataset that were randomly selected and used to rebuild the TIN/GRID model as described above. The remaining 6,581points were used to compare the recorded value for depth at each location with the modeled depth value. The average deviation between the measured and modeled depths was 0.202 feet. 5,797 (88%) points were within 0.5 feet and 6,348 (96%) points were within 1 foot. 233 (3.5%) points exceed 1 foot deviation.
Source_Used_Citation_Abbreviation: D:\mikeB\mapcoast\nin_data\ningrid.xml
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Grid Cell
Row_Count: 3478
Column_Count: 4204
Vertical_Count: 1
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: State Plane Coordinate System 1983
State_Plane_Coordinate_System:
SPCS_Zone_Identifier: 3800
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.999994
Longitude_of_Central_Meridian: -71.500000
Latitude_of_Projection_Origin: 41.083333
False_Easting: 328083.333333
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: row and column
Coordinate_Representation:
Abscissa_Resolution: 5.000000
Ordinate_Resolution: 5.000000
Planar_Distance_Units: survey feet
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257222
Vertical_Coordinate_System_Definition:
Depth_System_Definition:
Depth_Datum_Name: Land survey datum (NAVD88)
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: MapCoast.org
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Contact_Voice_Telephone: 401-874-5054
Contact_Electronic_Mail_Address: mike@edc.uri.edu
Resource_Description: Downloadable Data
Standard_Order_Process:
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Transfer_Size: 61.274
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Generated by mp version 2.8.6 on Fri May 23 11:32:36 2008