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ftp://ftp.coast.noaa.gov/pub/benthic/Shallow_Water_Bathymetry/FL_ApalachicolaBay_bath.zip |
Bulk Download |
FTP download of data files. |
download |
| 1 |
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http://pubs.usgs.gov/of/2006/1381/ |
Citation URL |
Online Resource |
download |
| 1 |
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http://pubs.usgs.gov/of/2006/1381/GIS/raster/bath/apbaybath25m.zip |
http://pubs.usgs.gov/of/2006/1381/GIS/raster/bath/apbaybath25m.zip |
Downloadable Data |
download |
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https://coast.noaa.gov/ |
NOAA's Office for Coastal Management (OCM) website |
Information on the NOAA Office for Coastal Management (OCM) |
download |
| 4 |
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https://coast.noaa.gov |
NOAA Office for Coastal Management Website |
NOAA Office for Coastal Management Home Page |
information |
| 1 |
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https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords |
GCMD Keyword Forum Page |
Global Change Master Directory (GCMD). 2024. GCMD Keywords, Version 19. Greenbelt,
MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard
Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA).
URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords |
information |
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https://www.fisheries.noaa.gov/inport/item/47876 |
Full Metadata Record |
View the complete metadata record on InPort for more information about this dataset. |
information |
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https://www.fisheries.noaa.gov/inportserve/waf/noaa/nos/ocm/dmp/pdf/47876.pdf |
NOAA Data Management Plan (DMP) |
NOAA Data Management Plan for this record on InPort. |
information |
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2006-10-01T00:00:00 |
Bathymetric data were corrected for variations in the speed of sound throughout the
water column; sound velocity profiles were acquired throughout the survey area using
an Applied MicroSystems SVPlus Sound Velocimeter. These data were downloaded and reformatted
to the required format needed for use within University of New Brunswick's Ocean Mapping
Group (OMG) SwathEd multibeam processing software. The raw Submetrix 2000 Series data
were "unraveled" and reformatted into the OMG format. This process creates several
files on disk:
1) bathymetric soundings
2) raw sidescan backscatter
3) navigation
4) parameter files describing the configuration of the system (i.e. offsets between
motion reference unit and GPS antenna, etc). This process also incorporates the sound
velocity profiles in order to properly trace the rays given the structure of the water
column.
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2006-10-01T00:00:00 |
The OMG formatted bathymetric data were then graphically edited using the SwathEd
multibeam processing software. This step enabled editing on a "ping-by-ping" basis,
both in the across- and along-track dimension. Spurious or erroneous data were removed.
The navigation data were also graphically examined for each line of data.
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2006-10-01T00:00:00 |
Soundings were corrected to mean lower low water (MLLW) using high-resolution Real-Time
Kinematic Global Positioning System (RTKGPS) measurements. The one second RTK data
were smoothed in MatLab using a 3rd order polynomial and then merged with each line
file in SwathEd.
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2006-10-01T00:00:00 |
Soundings data were gridded using the weigh_grid routines from SwathEd. Soundings
were corrected to mean lower low water during the weigh_grid operation using the real
time kinematic differential global positioning navigation files.
The final weigh_grid parameters used were:
weigh_grid -omg -coeffs -butter -lambda 5 -cutoff 20
Max_incidence angle was not used on most lines to allow usage of bathymetry data points
from a broader section of the swath. Only lines from rough days, when the vessel heave
was large, were gridded with a small incidence angle to maximize the good data from
adjacent lanes and reduce the noisy data.
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2006-10-01T00:00:00 |
Final soundings were gridded to a 5m grid cell resolution using SwathEd weigh_grid
command and the following gridding parameters:
weigh_grid -omg -coeffs -butter -power 2 -lambda 1 -cutoff 4 -max_incidence 60
A 5m grid cell size reduced the number of points and a max_incidence of 60 degrees
was used to remove the outer soundings which tended to be noisy.
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2006-10-01T00:00:00 |
The final grid in SwathEd OMG format was imported directly into IVS DMagic software
producing a .geo, .dtm, and .shade file. The dtm file was exported to an x,y,z comma
delimited file.
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2006-10-01T00:00:00 |
The comma-delimited x,y,z file of bathymetry was added to ArcMap as an event theme
and converted to a point feature class. Two separate x,y,z files and feature classes
were processed; one for Apalachicola Bay, and one for St. George Sound.
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2006-10-01T00:00:00 |
The remaining geoprocessing steps were completed using one model developed in ArcGIS
Modelbuilder. The Model is included in the geodatabase distributed with the Open-File
Report. Each of the processing steps used to Create the Model for St. George Sound
are described below. The same processing steps were used to create a second Model
for Apalachicola Bay using the same steps.
Created empty TIN and added the x,y,z points using the geoprocessing history below:
Create TIN
*Date: 20061027
*Time: 113410
*Tool location: C:\Program Files\ArcGIS\ArcToolbox\Toolboxes\3D Analyst Tools.tbx\CreateTin
*Command issued: CreateTin D:\GIS\FL\rafa06001\ArcGIS\Bathy\BathInterp\Tin\StGTin
"PROJCS['WGS_1984_UTM_Zone_16N',GEOGCS['GCS_WGS_1984',DATUM['D_WGS_1984',SPHEROID['WGS_1984',6378137.0,298.257223563]],PRIMEM['Greenwich',0.0],UNIT['Degree',0.0174532925199433]],PROJECTION['Transverse_Mercator'],PARAMETER['False_Easting',500000.0],PARAMETER['False_Northing',0.0],PARAMETER['Central_Meridian',-87.0],PARAMETER['Scale_Factor',0.9996],PARAMETER['Latitude_Of_Origin',0.0],UNIT['Meter',1.0]];-10000
-10000 100000;0 100000;0 100000"
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2006-10-01T00:00:00 |
Added 5m xyz points to TIN
See geoprocessing history below:
Process:
*Process name: Edit TIN
*Date: 20061027
*Time: 113535
*Tool location: C:\Program Files\ArcGIS\ArcToolbox\Toolboxes\3D Analyst Tools.tbx\EditTin
*Command issued: EditTin D:\GIS\FL\rafa06001\ArcGIS\Bathy\BathInterp\Tin\stgtin "StG_5mc_xyz
depth masspoints false;BathClip <None> <None> hardclip false" D:\GIS\FL\rafa06001\ArcGIS\Bathy\BathInterp\Tin\stgtin
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2007-01-01T00:00:00 |
Converted Tin to Raster using Natural Neighbors using floating point and natural neighbors
options. Cells size was set at 25m.
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2007-01-01T00:00:00 |
Output Raster was clipped to a polygon boundary delineating the extent of bathymetric
data.
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2007-01-01T00:00:00 |
The clipped 25m bathymetric grid was smoothed with a 3x3 low-pass filter.
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2007-01-01T00:00:00 |
Individual 25m smoothed grids of Apalachicola Bay and St. George Sound were merged
together to make one grid for both areas.
|