Dataset Identification:
Resource Abstract:
- description: Slope of slope was calculated from the bathymetry surface for each raster cell by applying the ArcGIS Spatial
Analyst 'Slope' Tool to a previously created slope raster. Slope of slope describes the maximum rate of change of
slope (in degrees of degrees) within a square 3x3 cell neighborhood. The slope of slope metric has been found to be important
in predicting the distribution and abundance of fish and corals (Pittman et al., 2009). Consequently, the 2x2 meter resolution
slope of slope GeoTIFF was exported and added as a new map layer to aid in benthic habitat classification. Acoustic imagery
was acquired for the VICRNM on two separate missions onboard the NOAA ship, Nancy Foster. The first mission took place from
2/18/04 to 3/5/04. The second mission took place from 2/1/05 to 2/12/05. On both missions, seafloor depths between 14 to 55
m were mapped using a RESON SeaBat 8101 ER (240 kHz) MBES sensor. This pole-mounted system measured water depths across a
150 degree swath consisting of 101 individual 1.5 degree x 1.5 degree beams. The beams to the port and starboard of nadir
(i.e., directly underneath the ship) overlapped adjacent survey lines by approximately 10 m. The vessel survey speed was between
5 and 8 kn. In 2004, the ship's location was determined by a Trimble DSM 132 DGPS system, which provided a RTCM differential
data stream from the U.S. Coast Guard Continually Operating Reference Station (CORS) at Port Isabel, Puerto Rico. Gyro, heave,
pitch and roll correctors were acquired using an Ixsea Octans gyrocompass. In 2005, the ship's positioning and orientation
were determined by the Applanix POS/MV 320 V4, which is a GPS aided Inertial Motion Unit (IMU) providing measurements of roll,
pitch and heading. The POS/MV obtained its positions from two dual frequency Trimble Zephyr GPS antennae. An auxiliary Trimble
DSM 132 DGPS system provided a RTCM differential data stream from the U.S. Coast Guard CORS at Port Isabel, Puerto Rico. For
both years, CTD (conductivity, temperature and depth) measurements were taken approximately every 4 hours using a Seabird
Electronics SBE-19 to correct for the changing sound velocities in the water column. In 2004, raw data were logged in .xtf
(extended triton format) using Triton ISIS software 6.2. In 2005, raw data were logged in .gsf (generic sensor format) using
SAIC ISS 2000 software. Data from 2004 were referenced to the WGS84 UTM 20 N horizontal coordinate system, and data from 2005
were referenced to the NAD83 UTM 20 N horizontal coordinate system. Data from both projects were referenced to the Mean Lower
Low Water (MLLW) vertical tidal coordinate system. The 2004 and 2005 MBES bathymetric data were both corrected for sensor
offsets, latency, roll, pitch, yaw, static draft, the changing speed of sound in the water column and the influence of tides
in CARIS Hips & Sips 5.3 and 5.4, respectively. The 2004 data was then binned to create a 1 x 1 m raster surface, and
the 2005 data was binned to a create 2 x 2 m raster surface. After these final surfaces were created, the datum for the 2004
bathymetric surfaces was transformed from WGS84 to NAD83 using the "Project Raster" function in ArcGIS 9.1. The
2004 surface was transformed so that it would have the same datum as the 2005 surface. The 2004 bathymetric surface was then
down sampled from 1 x 1 to 2 x 2 m using the "Resample" function in ArcGIS 9.1. The 2004 surface was resampled so
it would have the same spatial resolution as the 2005 surface. Having the same coordinate systems and spatial resolutions,
the final 2004 and 2005 bathymetry rasters were then merged using the Raster Calculator function "Merge" in ArcGIS's
Spatial Analyst Extension to create a seamless bathymetry surface for the entire VICRNM area south of St. John. For a complete
description of the data acquisition and processing parameters, please see the data acquisition and processing reports (DAPRs)
for projects: NF-04-06-VI and NF-05-05-VI (Monaco & Rooney, 2004; Battista & Lazar, 2005).; abstract: Slope of slope
was calculated from the bathymetry surface for each raster cell by applying the ArcGIS Spatial Analyst 'Slope' Tool
to a previously created slope raster. Slope of slope describes the maximum rate of change of slope (in degrees of degrees)
within a square 3x3 cell neighborhood. The slope of slope metric has been found to be important in predicting the distribution
and abundance of fish and corals (Pittman et al., 2009). Consequently, the 2x2 meter resolution slope of slope GeoTIFF was
exported and added as a new map layer to aid in benthic habitat classification. Acoustic imagery was acquired for the VICRNM
on two separate missions onboard the NOAA ship, Nancy Foster. The first mission took place from 2/18/04 to 3/5/04. The second
mission took place from 2/1/05 to 2/12/05. On both missions, seafloor depths between 14 to 55 m were mapped using a RESON
SeaBat 8101 ER (240 kHz) MBES sensor. This pole-mounted system measured water depths across a 150 degree swath consisting
of 101 individual 1.5 degree x 1.5 degree beams. The beams to the port and starboard of nadir (i.e., directly underneath the
ship) overlapped adjacent survey lines by approximately 10 m. The vessel survey speed was between 5 and 8 kn. In 2004, the
ship's location was determined by a Trimble DSM 132 DGPS system, which provided a RTCM differential data stream from
the U.S. Coast Guard Continually Operating Reference Station (CORS) at Port Isabel, Puerto Rico. Gyro, heave, pitch and roll
correctors were acquired using an Ixsea Octans gyrocompass. In 2005, the ship's positioning and orientation were determined
by the Applanix POS/MV 320 V4, which is a GPS aided Inertial Motion Unit (IMU) providing measurements of roll, pitch and heading.
The POS/MV obtained its positions from two dual frequency Trimble Zephyr GPS antennae. An auxiliary Trimble DSM 132 DGPS system
provided a RTCM differential data stream from the U.S. Coast Guard CORS at Port Isabel, Puerto Rico. For both years, CTD (conductivity,
temperature and depth) measurements were taken approximately every 4 hours using a Seabird Electronics SBE-19 to correct for
the changing sound velocities in the water column. In 2004, raw data were logged in .xtf (extended triton format) using Triton
ISIS software 6.2. In 2005, raw data were logged in .gsf (generic sensor format) using SAIC ISS 2000 software. Data from 2004
were referenced to the WGS84 UTM 20 N horizontal coordinate system, and data from 2005 were referenced to the NAD83 UTM 20
N horizontal coordinate system. Data from both projects were referenced to the Mean Lower Low Water (MLLW) vertical tidal
coordinate system. The 2004 and 2005 MBES bathymetric data were both corrected for sensor offsets, latency, roll, pitch, yaw,
static draft, the changing speed of sound in the water column and the influence of tides in CARIS Hips & Sips 5.3 and
5.4, respectively. The 2004 data was then binned to create a 1 x 1 m raster surface, and the 2005 data was binned to a create
2 x 2 m raster surface. After these final surfaces were created, the datum for the 2004 bathymetric surfaces was transformed
from WGS84 to NAD83 using the "Project Raster" function in ArcGIS 9.1. The 2004 surface was transformed so that
it would have the same datum as the 2005 surface. The 2004 bathymetric surface was then down sampled from 1 x 1 to 2 x 2 m
using the "Resample" function in ArcGIS 9.1. The 2004 surface was resampled so it would have the same spatial resolution
as the 2005 surface. Having the same coordinate systems and spatial resolutions, the final 2004 and 2005 bathymetry rasters
were then merged using the Raster Calculator function "Merge" in ArcGIS's Spatial Analyst Extension to create
a seamless bathymetry surface for the entire VICRNM area south of St. John. For a complete description of the data acquisition
and processing parameters, please see the data acquisition and processing reports (DAPRs) for projects: NF-04-06-VI and NF-05-05-VI
(Monaco & Rooney, 2004; Battista & Lazar, 2005).
Citation
- Title Slope of the Slope Derivative Surface used to characterize the complexity of the seafloor around St. John, USVI.
-
- creation Date
2018-02-07T21:17:40.144491
Resource language:
Processing environment:
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Metadata data stamp:
2018-08-06T19:44:36Z
Resource Maintenance Information
- maintenance or update frequency:
- notes: This metadata record was generated by an xslt transformation from a dc metadata record; Transform by Stephen M. Richard, based
on a transform by Damian Ulbricht. Run on 2018-08-06T19:44:36Z
Metadata contact
-
pointOfContact
- organisation Name
CINERGI Metadata catalog
-
- Contact information
-
-
- Address
-
- electronic Mail Address cinergi@sdsc.edu
Metadata language
eng
Metadata character set encoding:
utf8
Metadata standard for this record:
ISO 19139 Geographic Information - Metadata - Implementation Specification
standard version:
2007
Metadata record identifier:
urn:dciso:metadataabout:4cbf8d65-dc95-4fd2-bebc-976d9538fc92
Metadata record format is ISO19139 XML (MD_Metadata)