48104
Inundation Mapping Tidal Surface - Mean Higher High Water
NOAA_OCM_MHHW_Metadata
Data Set
Published / External
37230
Inundation
Project
Completed
2019
These data are a derived product of the NOAA VDatum tool and they extend the tool's Mean Higher High Water (MHHW) tidal datum conversion inland beyond its original extent.
VDatum was designed to vertically transform geospatial data among a variety of tidal, orthometric and ellipsoidal vertical datums - allowing users to convert their data from different horizontal/vertical references into a common system and enabling the fusion of diverse geospatial data in desired reference levels (http://vdatum.noaa.gov/). However, VDatum's conversion extent does not completely cover tidally-influenced areas along the coast. For more information on why VDatum does not provide tidal datums inland, see http://vdatum.noaa.gov/docs/faqs.html.
Because of the extent limitation and since most inundation mapping activities use a tidal datum as the reference zero (i.e., 1 meter of sea level rise on top of Mean Higher High Water), the NOAA Office for Coastal Management created this dataset for the purpose of extending the MHHW tidal datum beyond the areas covered by VDatum. The data do not replace VDatum, nor do they supersede the valid datum transformations VDatum provides. However, the data are based on VDatum's underlying transformation data and do provide an approximation of MHHW where VDatum does not provide one. In addition, the data are in a GIS-friendly format and represent MHHW in NAVD88, which is the vertical datum by which most topographic data are referenced.
Data are in the UTM NAD83 projection. Horizontal resolution varies by VDatum region, but is either 50m or 100m. Data are vertically referenced to NAVD88 meters.
These data were created to support the mapping of tidally-based inundation scenarios on high resolution digital elevation models. The data represent the MHHW tidal datum referenced to NAVD88, which is the official civilian orthometric datum by which most topographic data are referenced.
10961
These data do not replace valid VDatum transformations. They do not incorporate VDatum's bounding polygons (or valid transformation areas) - the data extend beyond these areas.
Theme
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > LAND SURFACE > GEOMORPHIC LANDFORMS/PROCESSES > COASTAL PROCESSES > FLOODING
Theme
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > LAND SURFACE > GEOMORPHIC LANDFORMS/PROCESSES > COASTAL PROCESSES > SEA LEVEL CHANGES
Theme
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION > DIGITAL ELEVATION/TERRAIN MODEL (DEM)
Theme
ISO 19115 Topic Category
elevation
Spatial
Global Change Master Directory (GCMD) Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA
Spatial
Global Change Master Directory (GCMD) Location Keywords
OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > CARIBBEAN SEA > PUERTO RICO
Spatial
Global Change Master Directory (GCMD) Location Keywords
OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > CARIBBEAN SEA > VIRGIN ISLANDS
Theme
DEM
Theme
Digital Elevation Model
Theme
MHHW
Theme
elevation
Theme
flooding
Theme
inundation
Theme
mean higher high water
Theme
sea level rise
Theme
tidal datum
Theme
topography
Spatial
Conterminous US
Spatial
Puerto Rico
Spatial
US Virgin Islands
Spatial
coastal states
Office for Coastal Management
Charleston
SC
Data Set
As Needed
Any conclusions drawn from the analysis of this information are not the responsibility of the Office for Coastal Management or its partners.
Acknowledgment of the NOAA Office for Coastal Management as a data source would be appreciated in products developed from these data, and such acknowledgment as is standard for citation and legal practices for data source is expected.
Data Steward
2019
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Distributor
2019
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Metadata Contact
2019
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Point of Contact
2019
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Publication Date
-124.851
-64.51
49.005
17.619
Range
2007-10-01
2019-10-24
Yes
Unclassified
None
The dataset is provided as is, without warranty to its performance, merchantable state, or fitness for any particular purpose. The entire risk associated with the results and performance of this dataset is assumed by the user. This dataset should be used strictly as a planning reference and not for navigation, permitting, or other legal purposes.
http://vdatum.noaa.gov/
Online Resource
https://coast.noaa.gov/digitalcoast/tools/slr
Online Resource
https://coast.noaa.gov/htdata/Inundation/TidalSurfaces/NOAA_OCM_MHHWInterpolatedSurface.zip
Online Resource
2017-10-31
Date that the source FGDC record was last modified.
2017-11-14
Converted from FGDC Content Standards for Digital Geospatial Metadata (version FGDC-STD-001-1998) using 'fgdc_to_inport_xml.pl' script. Contact Tyler Christensen (NOS) for details.
Data are complete and cover all areas defined by the source data.
Standard mapping methods were used to develop the data, which are described in the Process Steps section. Outputs were inspected for errors and inconsistencies, which were addressed and remedied.
Census County Boundaries
Census Bureau
2014-01-01
Discrete
2014
Census County Boundaries, https://www.census.gov/geo/maps-data/data/cbf/cbf_counties.html | Type of Source Media: online
NOAA VDatum Version 4.0.1
Organization
NOAA
Originator
2019-10-24
Range
2007-10-01
2019-10-24
https://vdatum.noaa.gov/
NOAA VDatum transformation grids for each VDatum region, https://vdatum.noaa.gov/docs/gtx_info.html. | Type of Source Media: online
USGS 10 and 12-digit hydrologic unit code (HUC) watershed boundaries
Organization
USGS
Originator
2016-01-06
Discrete
2019-09-04
USGS 10 and 12-digit hydrologic unit code (HUC) watershed boundaries from the Watershed Boundary Dataset, http://nhd.usgs.gov/wbd.html | Type of Source Media: online
1
Buffered Census Counties offshore by 6km. Source VDatum .gtx files were shifted from positive east longitude values to negative west values. The tss grid was subtracted from the MHHW tidal grid. This step resulted in the MHHW tidal datum referenced to an orthometric datum, specifically NAVD88. Each region's orthometric-referenced tidal grid was converted to a point file, where each cell's centroid is a point containing the value of the cell. The point data were then clipped to county boundaries that extend ~6 km offshore to limit the number of points in the interpolation below. 10 and 12-digit hydrologic unit code (HUC) watershed boundaries that intersect the point data were selected. Where VDatum regions overlapped for an area, the VDatum bounding polygons were used to remove points outside of these areas. Where there was still overlap, points from either the higher resolution region or regions covering bays and estuaries were used. Using the Inverse Distance Weighted interpolation method, the point data were used to interpolate the NAVD88-based tidal surface inland, using the selected HUC boundaries as barriers to interpolation. This approach uses only points within the watershed and limits the interpolation to areas only within the watershed. This process was done for both 10 and 12-digit HUC watersheds. The resulting interpolated surfaces were then nested or mosaicked, where the HUC 12 interpolated surface was the primary raster and the HUC 10 surface the secondary. A Euclidean Allocation approach was then used to extend the conversion further inland to areas where the HUC 10 watersheds did not cover the study area. County boundaries were used as the inland limit instead of watersheds since most topographic data are collected and/or available on a county basis.
2016-01-01T00:00:00
gov.noaa.nmfs.inport:48104
Anne Ball
2017-11-14T14:15:21
SysAdmin InPortAdmin
2023-05-30T18:09:30
2017-11-16
Office for Coastal Management
OCM
1002
Public
No
2017-11-16
1 Year
2018-11-16