Pacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)
20100607
Mosaic of gridded multibeam bathymetry and bathymetry derived from multispectral
IKONOS satellite imagery of Rose Atoll, American Samoa, USA
raster digital data
http://www.soest.hawaii.edu/pibhmc
http://www.soest.hawaii.edu/pibhmc/pibhmc_amsamoa_rose_bathy.htm
Gridded multibeam bathymetry is integrated with bathymetry derived from
multispectral IKONOS satellite data. Gridded (5 m cell size) multibeam bathymetry
were collected aboard the R/V AHI (Acoustic Habitat Investigator). Bathymetry values
shallower than 25 m were derived from multispectral IKONOS satellite image by analyzing
the relative attenuation of blue and green spectral radiance as a function of depth.
A multiple linear regression analysis of linearized blue and green band spectral values
against multibeam depths determined the variables of y-intercept, blue slope and green
slope values. Variables were then used in multivariate slope intercept formula to derive
depth. Variables were adjusted to improve the statistical accuracy and
spatial coverage of the final derived bathymetry product. Digital image
processing to derive depths conducted with the ENVI 4.5 software program
while data editing and integration was performed using ArcGIS 9.3. This
dataset is for the bank and lagoon environment of Rose Atoll, American Samoa, USA.
The data were derived in support of NOAA Coral Reef Conservation
Program goals. Goal 1 is to map all U.S. Coral Reef Ecosystems.
This data set specifically addresses Objective 1 and 4: to develop
high-resolution benthic maps and to characterize priority deep
water reefs and associated habitats. This integration of derived
bathymetry data provides a GIS layer with expanded spatial coverage that
may be used for benthic and essential fish habitat characterization, and for
the study of geologic features. By combining the dataset with other bathymetry,
backscatter, derivatives, and in situ data, they collectively compose benthic
habitat maps designed to be used to understand and predict shallow depth
(0m to 150m) benthic habitats for organisms that inhabit coral reef ecosystems.
Original IKONOS imagery was purchased to support the Pacific Islands
Geographic Information System (GIS) project and National Ocean Service's
(NOS) coral mapping activities. Orthographically corrected IKONOS Imagery
was provided by NOAA's National Centers for Coastal Ocean Science, Center
for Coastal Monitoring and Assessment. The metadata for this IKONOS
imagery is documented in the original product metadata, po_87351_metadata_rose
(http://www.soest.hawaii.edu/pibhmc/)
Gridded multibeam data were collected aboard the R/V AHI (Acoustic Habitat
Investigator), a 25' survey launch owned and operated by the NOAA
Pacific Islands Fisheries Science Center in Honolulu, HI. The
metadata for the bathymetry is documented in the product metadata,
Rose_5m.asc.txt.
http://www.soest.hawaii.edu/pibhmc/pibhmc_amsamoa_rose.htm
20020305
20060313
ground condition
As needed
-168.173489
-168.136652
-14.527710
-14.561023
NCEI Geoportal FilterCoRIS_Metadata
CRCP Project
Benthic Habitat Mapping and Characterization - American Samoa and the U.S. Pacific Remote Island Area
1084
ISO 19115 Topic Category
elevation
006
CoRIS Discovery Thesaurus
Geographic Information > Bathymetry
CoRIS Theme Thesaurus
EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Remote Sensing > Satellite (digital scans) > IKONOS
EARTH SCIENCE > Biosphere > Aquatic Habitat > Reef Habitat > Description
EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Bathymetry
EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Water Depth
CoRIS Place Thesaurus
OCEAN BASIN > Pacific Ocean > American Samoa > Rose Atoll (14S168W0001)
COUNTRY/TERRITORY > United States of America > American Samoa > American Samoa > Rose Atoll (14S168W0001)
CoRIS Region
AmSam
None
These data are not to be used for navigation purposes. Please acknowledge NOAA Pacific Islands Fisheries
Science Center, the Joint Institute for Marine and
Atmospheric Research (JIMAR) University of Hawaii and Davey
Jones Locker GIS Laboratory Oregon State University as the
sources of this information.
http://www.soest.hawaii.edu/pibhmc/amsamoa_images/Rose_bathymetry_mb&IKONOS_445.jpg
Gridded Bathymetry
JPEG
NOAA PIFSC CRED, the Pacific Islands Benthic Habitat
Mapping Center and Davey Jones Locker GIS Laboratory Oregon State University
Not applicable
Unclassified
Not applicable
ArcGIS ASCII file or ArcGIS Grid file,
bathymetry derived from 4x4m multispectral satellite imagery (IKONOS)
using ENVI 4.5, multibeam and derived bathymetry were integrated using
ArcGIS 9.3
Data are collected for resource
management and research purposes and are tested for
internal consistency; however, no effort is made to compare
these data to external references or to other published data.
These data are believed to be logically
consistent though no tests were performed
Complete
Horizontal positioning system: GPS C/A
Horizontal position accuracy: 25 meters
Range resolution of sonar: varies with depth
Raw sounding resolution: varies with depth
Vertical accuracy of gridded sonar product: ~ 1% of water depth
Vertical accuracy of derived bathymetry product: 5 meter range
Multiple tools in ENVI 4.5 were used to complete the following
processing steps: Data conversion from digital number to radiance,
correction for atmosphere and water surface reflection,
linearization of spectral decay as function of depth, masking of
non-applicable values, and bathymetric derivation using variables
from multiple linear regression analysis. Multiple tools in
ArcGIS 9.3 were used for dataset integration and to extract values
for the multiple linear regression analysis and subsequent error
analyses. The statistics program S-Plus was used for the multiple
linear regression analysis to provide original variables for depth
derivation. The multivariate slope intercept formula used to
derive depth was Depth=Yint+(Mblue)(Xblue)+(Mgreen)(Xgreen). Fourteen
derived products from the image rose_msi_rat_final (Rose351) were
integrated to expand spatial coverage. This image was provided in TIFF
format. The original MLR variables for Rose351 were Yint=13.2711,
Mblue=1.8847, and Mgreen=11.2034. The product derived from these
variables (Rose351_DB) was mosaiced with thirteen additional products derived
using increasingly reduced Y-intercept values as follows:
Yint=12.2711 (Rose351_DB1), Yint=11.2711 (Rose351_DB2), Yint=10.2711
(Rose351_DB3), Yint=9.2711 (Rose351_DB4), Yint=8.2711 (Rose351_DB5),
Yint=7.2711 (Rose351_DB6), Yint=6.2711 (Rose351_DB7), Yint=5.2711 (Rose351_DB8),
Yint=4.2711 (Rose351_DB9), Yint=3.2711 (Rose351_DB10), Yint=2.2711 (Rose351_DB11),
Yint=1.2711 (Rose351_DB12), Yint=0.2711 (Rose351_DB13). This was done to increase
coverage in shallow areas.
A detailed description of these processing steps is available at:
http://oregonstate.edu/~hogrefek/Cookbook/Cookbook_042108.pdf
An error analysis of each derived bathymetry grid used is available
from PIBHMC upon request.
This mosaiced derived bathymetry product (rose_dball2) was then
integrated with the multibeam sonar data, with sonar data prioritized over
derived data, to create the final product (rose_5m_dbmb), through the following steps.
Initially, grdmath, a Generic Mapping Tools (GMT) algorithm that combines multiple grids,
was used to combine the mosaicked derived bathymetry product (rose_dball2) with the
gridded multibeam bathymetry (rose_5m). The AND operator was used to prioritize use of the
multibeam grid over the derived bathymetry grid, where the two overlapped. The resulting
product was found to have a noticeable artifact in the form of a marked step in depth
on the bank top, where the derived bathymetry and multibeam bathymetry grids met. To
avoid this problem, the final product was created by integrating the mosaic derived
bathymetry product (rose_dball2) with an extracted subset of the multibeam data
that only covered the inner lagoon. First, Fledermaus 3D Editor was used to extract xyz values
from the multibeam data to create a subset covering the inner lagoon (rose_lagoon.xyz). The
GMT nearneighbor algorithm was used to create a netCDF grid from the lagoon multibeam
data. Secondly, xyz points were extracted from the derived bathymetry product (rose_dball2)
using the Sample tool, available in ESRI ArcToolbox. The GMT nearneighbor algorithm was used to
create a nearneighbor grid from these data. The two nearneighbor grids (one from the
lagoon multibeam bathymetry and one from the mosaiced derived bathymetry product) were
combined using grdmath. The AND operator was used to prioritize use of the
multibeam grid over the derived bathymetry grid, where the two overlapped. The resulting grid
(ros_5m_dbmb.nn.grd) was then converted to ASCII format using LINUX/UNIX commands in combination
with GMT. (rose_5m_dmbm.asc). GMT is an open source collection of tools for manipulating geographic
data sets. Additional information about GMT can be found at: www.soest.hawaii.edu/gmt
20100601
Raster
Grid Cell
835
917
1
Universal Transverse Mercator
-2
0.999600
-171.000000
0.000000
500000.000000
10000000.000000
Row and Column
5.000000
5.000000
meters
D_WGS_1984
WGS_1984
6378137.000000
298.257224
Pacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)
John Rooney
mailing and physical address
NOAA IRC
NMFS/PIFSC/CRED
1845 WASP Blvd., Building 176
Honolulu
HI
96818
808 725-5360
808 725-5429
nmfs.pic.credinfo@noaa.gov
e-mail preferred
Downloadable Data
These data are not to be used for navigational purposes.
NOAA makes no warranty regarding these data, expressed or implied,
nor does the fact of distribution constitute such a warranty.
NOAA cannot assume liability for any damages caused by any errors
or omissions in these data, nor as a result of the failure of
these data to function on a particular system.
Arc ASCII
Arc ASCII can be converted to Arc
Raster using ArcToolbox Conversion Tools (ASCIItoRaster).
http://www.soest.hawaii.edu/pibhmc/pibhmc_amsamoa_rose_bathy.htm
None
20200329
20100823
Pacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)
CRED Data Management Team
mailing and physical address
NOAA IRC
NMFS/PIFSC/CRED
1845 WASP Blvd., Building 176
Honolulu
HI
96818
808 725-5360
808 725-5429
nmfs.pic.credinfo@noaa.gov
e-mail preferred
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
Universal Time
None
None
20100823021151
None
20020305
20060313
https://www.coris.noaa.gov/metadata/records/html/rose_5m_dbmb_asc.html
4948