The Integration of Bathymetry, Topography, and Shoreline and the Vertical Datum Transformations...
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Transcript of The Integration of Bathymetry, Topography, and Shoreline and the Vertical Datum Transformations...
![Page 1: The Integration of Bathymetry, Topography, and Shoreline and the Vertical Datum Transformations Behind it Charting and Mapping the Land-Sea Interface.](https://reader036.fdocuments.us/reader036/viewer/2022062423/5697c0111a28abf838ccb61a/html5/thumbnails/1.jpg)
The Integration The Integration of of
Bathymetry, Topography, and ShorelineBathymetry, Topography, and Shorelineand and
the Vertical Datum Transformations Behind itthe Vertical Datum Transformations Behind it
Charting and Mapping the Land-Sea Interface
Coast Survey Development Laboratory, Office of Coast Survey, National Ocean Service, NOAA
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Some Problems with Charting and Mapping the U.S. Coastal Zone
“95,000 miles of Coastline !”
Outdated data ( and low resolution)- bathymetry (NOS) [outside the navigation channels]- topography (USGS)
NOAA and USGS products do not match[especially the shoreline]
Difficulty measuring a consistently defined shoreline
Limited resources for new data (95,000 miles!)
Incompatibility between data sets from local sources (e.g., federal, state, county, city)
A geospatial reference frame for other coastal data sets that is less consistent and accurate than is needed
Affecting a variety of coastal applications (in addition to navigation products):
-- hurricane evacuation planning -- permitting -- local, state, and national boundaries-- habitat restoration -- shoreline change analysis -- assessing and determining setback lines-- erosion, accretion, renourishment -- natural hazards
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Applications for Integrated Bathymetric/Topographic/Shoreline
• Hurricane evacuation planning
• Permitting
• Assessing and determining setback lines
• Determining local, state, and national boundaries
• Habitat restoration
• Erosion, accretion, nourishment
• Shoreline Change Analysis
• Analyzing storm impacts
• Analyzing environmental and natural resources
• Emergency Response and Impact Assessment
• Navigation Products and Services
Florida Marine Spill Analysis System
Habitat Assessment
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Marine Boundaries in the U.S.
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Inconsistency between shorelines on NOAA and USGS products
Inconsistent Shorelines
NOAA Shoreline
plotted on a USGS Topo Sheet
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“the beginning”
The Tampa Bay The Tampa Bay Bathymetric/Topographic Bathymetric/Topographic
Demonstration ProjectDemonstration Project
Mapping the Land-Sea Interface
Partners:
NOS:OCS, NGS, CSC, CO-OPS
USGS:NMD (incl. EROS Data Ctr)
Others: UNH, FMRI, users
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Except for in and around thenavigation channels,the bathymetric dataare from the 1950s.
This is typical all around the country. In the nearshore areas the data are old.
NOS needs to be ableto take advantageof other data sources.
NOS Bathymetric DataNOS Bathymetric Data
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USGS Topographic DataUSGS Topographic Data
The original topographicdata for the Tampa Bayarea are also primarily fromthe 1950s, with some 1960sand early 1970s data.
This is also typical all around the country. In many areas the topographic data are old.
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In addition to the April 1999 airborne photogrammetry and the SPIN2 satellite data, shoreline data sets will be derived (and inter-compared) from: airborne lidar data, airborne hyperspectral data, IKONOS satellite data, SAR data, and SHOALS (bathymetric lidar) data.
High-Resolution Up-to-Date Shoreline from various Airborne and Satellite Techniques in Tampa Bay (NGS/RSD)
NOS Shoreline DataNOS Shoreline Data
For some areas the shoreline data are much more recent, but shoreline measurement has its own special problems.
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Nautical Chart1977 Photogrammetry1998 Image from Spin21999 Photogrammetry
Keeping up with changes in Manmade Shoreline
A Different Problem with Shoreline
Satellite images can help spot the changes, but is the resolution good enough for all purposes?
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How to cost-effectively map 95,000 miles of U.S. coastline?
Thus, NOS needs to be able to take advantage of other good quality data sources. (“3rd-Party Data”)[as does USGS also]
What prevents NOS from using“3rd-Party Data” ?
- standards- common vertical datums
NOS alone can’t acquire all the new bathymetry needed, and NOS will always have to give priority to navigational channels in ports.
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All Bathymetric and Topographic Elevation Data is georeferenced to a Vertical Datum Datums Arise From Relative Measurements, I
Datum A
10.0
5.0
0.0
5.0
25
20
15
10
5
0
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Datum B
0.0 0.0
5.0
10.0
15
10
5
0
-5
-10
20
All Bathymetric and Topographic Elevation Data is georeferenced to a Vertical Datum Datums Arise From Relative Measurements, II
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Discontinuity between A & B
Datum A
10.0
5.0
0.0
5.0
25
20
15
10
5
0
Datum B
0.0 0.0
5.0
10.0
15
10
5
0
-5
-10
20
All Bathymetric and Topographic ElevationData is georeferenced to a Vertical Datum Datums Arise From Relative Measurements, III
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When Datums Match
10.0
5.0
0.0
5.0
25
20
15
10
5
0
(All elevations are now consistent)
10.0 10.0
15.0
20.0
Datum A
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Integrated Bathy/Topo Model
NOAA Bathymetry
USGS Topography
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Slice through historical bathymetric data that wastransformed to the ellipsoid (red curve)
compared with January 2000 transectreferenced to the ellipsoid(blue curve).
Validating the datumtransformation with newGPS-referenced bathymetric data
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Airborne Lidar Mapping
Light Detection and Ranging (LIDAR)Fly Water-penetrating bathymetric LIDAR near High Water, e.g. SHOALS.
MLLW
MHW
Fly topographic LIDAR near Low Water.
Cover intertidal zone
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ATM LIDAR
USGS DOQ
Lidar in and landward of the intertidal zone
- transformation of Lidar DEM to MHW datum to produce MHW shoreline using VDatum (with tidal datums from hydrodynamic model).
- for the zone where the transformed topographic data meets the transformed bathymetric data
Univ. of FL LIDAR
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MHW Shoreline Produced from LIDAR
T-Sheet MHW
shoreline
16,000 points
MHW (LIDAR)(1996)
T-Sheet (1977)
NOAA Chart 11417
1:80,000
= 40mTampa Bay
LIDAR data from the University of Florida transformed to the MHW datum using VDatum.
1m GRID
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MHW Shoreline Produced from LIDAR
NOAA T-Sheet MHW shoreline
(1977)
0 m contour is MHW shoreline (1996)
1m GRID
Old Tampa Bay
LIDAR data from the University of Florida transformed to the MHW datum using VDatum.
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MHW Shoreline from LIDAR superimposed on 1m DOQQ
0 m contour (MHW) 1996
NOAA T-Sheet (1977)
Old Tampa Bay
MHW
Time of DOQQ
Man
grov
es
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Central California
Lidar data from CSC/USGS/NASA
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NAVD88 heights (meters)
NASA ATM II
1m LIDAR DEM
Central California
(just south of entrance to San Francisco)
LIDAR data from CSC / USGS / NASA
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Higher High Water High
Water
Lower Low Water
Low Water
MHW
Tidal Datum Fields off the Coast of California
• • MHW tidal datum fields (as well as MHHW, MLW, MLLW, MSL, MTL, DTL) from calibrated hydrodynamic models
• • Analysis of model-produced time series, then adjusted to provide a best fit to datums at NOS gauges.
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MHW From 1m LIDAR superimposed on Nautical Chart
Central California Bathy Project
MHW shoreline from 1m LIDAR
LIDAR data from CSC / USGS / NASA
Bluffs
MHW shoreline on NOAA nautical chart 18649
Entrance to San Francisco Bay
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http:// chartmaker.ncd.noaa.gov/bathytopo/
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Integrated Bathy/Topo Digital Elevation Model
NOAA Bathymetry
USGS Topography
EllipsoidModel
TidalModel
GeoidModel
National VDatum (Vertical Datum Transform Tool)
Marine Boundaries & Legal Issues
Stateowned
Privately owned
LIDAR
USGS Topo Sheet NOAA Shoreline
RTK-GPS vertical referencing Hydrographic Surveys
Shoreline from LIDAR in the intertidal zone
NOAA-USGS shorelineinconsistencies
NationalBathymetricDatabase
-User-friendly utilization of DEM with new hi-res data in a GIS environment
GIS users in the Coastal Community