Short Citation:
Office for Coastal Management, 2021: NOAA Office for Coastal Management Coastal Inundation Digital Elevation Model: New Hampshire, https://www.fisheries.noaa.gov/inport/item/56921.

Item Identification

Title: NOAA Office for Coastal Management Coastal Inundation Digital Elevation Model: New Hampshire
Short Name: NH DEM FY19 Update
Status: Completed
Publication Date: 2019-07
Abstract:

These data were created as part of the National Oceanic and Atmospheric Administration Office for Coastal Management's efforts to create an online mapping viewer called the Sea Level Rise and Coastal Flooding Impacts Viewer. It depicts potential sea level rise and its associated impacts on the nation's coastal areas. The purpose of the mapping viewer is to provide coastal managers and scientists with a preliminary look at sea level rise and coastal flooding impacts. The viewer is a screening-level tool that uses nationally consistent data sets and analyses. Data and maps provided can be used at several scales to help gauge trends and prioritize actions for different scenarios. The Sea Level Rise and Coastal Flooding Impacts Viewer may be accessed at: https://coast.noaa.gov/slr.

This metadata record describes the New Hampshire digital elevation model (DEM), which is a part of a series of DEMs produced for the National Oceanic and Atmospheric Administration Office for Coastal Management's Sea Level Rise and Coastal Flooding Impacts Viewer described above. This DEM includes the best available lidar known to exist at the time of DEM creation that met project specifications. This DEM includes data for Rockingham and Strafford Counties.

The DEM was produced from the following lidar data sets:

1. 2013 - 2014 USGS Hurricane Sandy Supplemental for NE (RI, MA, NH)

2. 2011 USGS ARRA Lidar for the Northeast: Massachusetts

The DEM is referenced vertically to the North American Vertical Datum of 1988 (NAVD88, Geoid12B) with vertical units of meters and horizontally to the North American Datum of 1983 (NAD83). The resolution of the DEM is approximately 3 meters.

Purpose:

The NOAA Office for Coastal Management has developed high-resolution digital elevation models (DEMs) for use in the Office's Sea Level Rise and Coastal Flooding Impacts internet mapping application. These DEMs serve as source datasets used to derive data to visualize the impacts of inundation resulting from sea level rise along the coastal United States and its territories.

Notes:

10911

Supplemental Information:

Source data and their associated metadata are available at the following URLs:

1. 2013 - 2014 USGS Hurricane Sandy Supplemental for NE (RI, MA, NH)

Metadata: https://viewer.nationalmap.gov/basic

Data Download: https://viewer.nationalmap.gov/basic

2. 2011 USGS ARRA Lidar for the Northeast: New Hampshire

Metadata: ftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/NED/OPR/xml/NE_LIDAR_G10PD02143_G10PD01027_RasterDEM_Metadata_Massachusetts.xml

Data Download: https://viewer.nationalmap.gov/basic

Keywords

Theme Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Science Keywords Earth Science > Land Surface > Geomorphic Landforms/Processes > Coastal Processes > Flooding
Global Change Master Directory (GCMD) Science Keywords Earth Science > Land Surface > Geomorphic Landforms/Processes > Coastal Processes > Sea Level Changes
Global Change Master Directory (GCMD) Science Keywords Earth Science > Land Surface > Topography > Terrain Elevation > Digital Elevation/Terrain Model (Dem)
ISO 19115 Topic Category elevation
None Bathymetry/Topography
None DEM
None Digital Elevation Model
None elevation
None flooding
None inundation
None lidar
None sea level rise
None topography

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords Continent > North America > United States Of America > New Hampshire
None New Hampshire
None Rockingham County
None Strafford County
None US

Physical Location

Organization: Office for Coastal Management
City: Charleston
State/Province: SC

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: None Planned
Data Presentation Form: Image (digital)
Distribution Liability:

Any conclusions drawn from the analysis of this information are not the responsibility of the NOAA Office for Coastal Management or its partners.

Data Set Credit: 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.

Support Roles

Distributor

CC ID: 861113
Date Effective From: 2019-07
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Metadata Contact

CC ID: 861114
Date Effective From: 2019-07
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Point of Contact

CC ID: 861112
Date Effective From: 2019-07
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Extents

Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 861129
W° Bound: -71.45253
E° Bound: -70.57387
N° Bound: 43.39298
S° Bound: 42.73668

Extent Group 1 / Time Frame 1

CC ID: 861128
Time Frame Type: Range
Start: 2011
End: 2014

Spatial Information

Spatial Representation

Representations Used

Grid: Yes

Grid Representation 1

CC ID: 861121
Dimension Count: 3
Cell Geometry: Area
Transformation Parameters Available?: No

Axis Dimension 1

Dimension Type: Row
Size: 24353

Axis Dimension 2

Dimension Type: Column
Size: 32604

Axis Dimension 3

Dimension Type: Vertical
Size: 1

Reference Systems

Reference System 1

CC ID: 861240

Coordinate Reference System

CRS Type: Geographic 2D
EPSG Code: EPSG:4269
EPSG Name: NAD83
See Full Coordinate Reference System Information

Horizontal Resolution

Horizontal Encoding Method: Latitude and Longitude
Latitude Resolution: 2.7E-5
Longitude Resolution: 2.7E-5
Horizontal Units: Decimal Degrees

Vertical Resolution

Vertical Encoding Method: Explicit Coordinate
Vertical Resolution: 0.001
Vertical Units: Meters

Access Information

Security Class: Unclassified
Data Access Constraints:

None

Data Use Constraints:

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.

URLs

URL 1

CC ID: 861115
URL: https://coast.noaa.gov/slr
URL Type:
Online Resource

URL 2

CC ID: 861116
URL: https://coast.noaa.gov/digitalcoast/tools/slr
URL Type:
Online Resource

URL 3

CC ID: 861117
URL: https://coast.noaa.gov/slrdata
URL Type:
Online Resource

URL 4

CC ID: 861118
URL: https://coast.noaa.gov
URL Type:
Online Resource

Data Quality

Horizontal Positional Accuracy:

The DEM is derived from the source lidar data. Horizontal accuracy testing is not performed on the DEM. Lidar source data assumed to meet 1 meter horizontal accuracy.

Vertical Positional Accuracy:

The DEM is derived from the source lidar data. Vertical accuracy is not tested on the DEM. Project specifications require all source lidar data used in constructing the DEM to meet FEMA Specifications for Flood Hazard Mapping.

Completeness Report:

A visual qualitative check was performed to ensure data completeness. All available lidar data known at the time of DEM creation that meets project specifications has been used to develop the DEM. Known data gaps may exist where lidar coverage was incomplete.

Conceptual Consistency:

Data covers the tile scheme provided for the project area. Elevation data checked for anomalous elevation values outside expected range.

Lineage

Process Steps

Process Step 1

CC ID: 861125
Description:

The source elevation datasets listed above were identified, downloaded, edited, and finalized.

Process Date/Time: 2019-07-01 00:00:00

Process Step 2

CC ID: 861126
Description:

Source elevation data and their associated hydro-breaklines, where available, were downloaded. Data were then reviewed and edited to meet the project's requirements. The major requirements were delineating streams 10m or greater in width, removing bridges over streams greater than 10m wide, flattening inland water bodies, and converting data referenced to an older geoid to the current geoid, Geoid 12B. NOAA's VDatum datum conversion tool was used to convert geoids. Ocean-connected water areas were removed from data prior to final mosaicking. Data were then mosaicked together based on date, with the most recent data taking priority. Ocean-connected water areas were given a value of -99 to standardize this area's value across sources, to flatten water for mapping, and to make it easy for users to remove ocean-connected water if desired.

Process Date/Time: 2019-07-01 00:00:00

Catalog Details

Catalog Item ID: 56921
Metadata Record Created By: William Brooks
Metadata Record Created: 2019-07-11 14:31+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2020-02-10 16:40+0000
Metadata Record Published: 2019-08-08
Owner Org: OCM
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Next Review Date: 2020-08-08