Short Citation:
Office for Coastal Management, 2021: NOAA Office for Coastal Management (OCM) Lake Level Data: -6 Feet to +6 Feet Water Level Change, https://www.fisheries.noaa.gov/inport/item/48103.

Item Identification

Title: NOAA Office for Coastal Management (OCM) Lake Level Data: -6 Feet to +6 Feet Water Level Change
Short Name: NOAA_OCM_LLV_neg6_to_pos6ft_metadata
Status: Completed
Publication Date: 2017
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 depicting potential water level increase and decrease in the coastal areas of the Great Lakes. The lakes included are: Erie, Huron, Michigan,

Ontario, St. Clair, and Superior. The purpose of the mapping viewer is to provide coastal managers and scientists with a preliminary look at lake level

change and potential coastal impacts. The viewer is a screening-level tool that uses nationally consistent data sets and analyses to help users examine

multiple scenarios and prioritize actions. The Lake Level Viewer may be accessed at https://coast.noaa.gov/llv.

These data consist of 13 water extent polygons and 13 water depth rasters (3 m resolution, depth values in meters) that show the potential water level when

the water level is decreased from 0 feet to -6 feet (resulting in potential land exposure) and when water level is increased from 0 to +6 feet (resulting

in potential flooding). These data are based on the each lake's long term average water level over the period of record (1913-2008). More information on

the long term average water level can be found at https://www.glerl.noaa.gov//pubs/fulltext/2013/20130021.pdf,

https://www.glerl.noaa.gov//pubs/fulltext/2013/20130022.pdf, and the Great Lakes Water Level Dashboard (https://www.glerl.noaa.gov/data/dashboard/GLWLD.html).

The process used to produce the data can be described as a bathtub approach. The process uses two source data sets to derive the final water extent polygons

and water depth rasters for each iteration of water level decrease or increase: the Digital Elevation Model (DEM) of the area and each lake's long term

average water level over the period of record (1918-2017) at the time of data set creation. Data can be downloaded at https://coast.noaa.gov/llv.

The model used to produce these data does not account for erosion, subsidence, or any future construction. Water levels are as they would appear during calm

conditions (excludes wind-driven effects). As with all remotely sensed data, all features should be verified with a site visit. The data are provided as is,

without warranty to their performance, merchantable state, or fitness for any particular purpose. The entire risk associated with the results and

performance of these data is assumed by the user. This data should be used strictly as a planning reference and not for navigation, permitting, or other

legal purposes.

Purpose:

The purpose of these data is to provide the user with information that can help communicate potential lake level change impacts as a result of either

water level decrease or increase. These data can be incorporated with the user's own data in order to make customized lake level impacts analyses.

Notes:

10960

Supplemental Information:

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: NAD 1983 Great Lakes and St Lawrence Albers

Albers_Conical_Equal_Area:

Standard_Parallel: 42.122774

Standard_Parallel: 49.01518

Longitude_of_Central_Meridian: -83.248627

Latitude_of_Projection_Origin: 45.568977

False_Easting: 1000000.0

False_Northing: 1000000.0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 0.000000003398570314061545

Ordinate_Resolution: 0.000000003398570314061545

Planar_Distance_Units: meter

Geodetic_Model:

Horizontal_Datum_Name: D North American 1983

Ellipsoid_Name: GRS 1980

Semi-major_Axis: 6378137.0

Denominator_of_Flattening_Ratio: 298.257222101

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 climatologyMeteorologyAtmosphere
ISO 19115 Topic Category elevation
ISO 19115 Topic Category environment
ISO 19115 Topic Category oceans
None Bathymetry/Topography
None elevation
None flooding
None inundation
None Shoreline
None water level decrease
None water level increase
None water level rise

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords Continent > North America > United States Of America > Great Lakes
None Great Lakes
None Illinois
None Indiana
None Lake Erie
None Lake Huron
None Lake Michigan
None Lake Ontario
None Lake Superior
None Michigan
None Minnesota
None New York
None Ohio
None Pennsylvania
None United States
None Wisconsin

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
Distribution Liability:

These data illustrate the scale of potential water level decrease and increase, not the exact location, and do not account for erosion, subsidence,

or future construction. Water level is shown as it would appear based on each lake's long term average water level over the period of record (excludes wind

driven effects) with one foot increments of water level decrease or increase. These data should be used only as a screening-level tool for management

decisions. As with all remotely sensed data, all features should be verified with a site visit. The data set 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 data set is

assumed by the user. This data set should be used strictly as a planning reference and not for navigation, permitting, or other legal purposes. Any

conclusions drawn from the analysis of this information are not the responsibility of the Office for Coastal Management (OCM) or its partners.

Data Set Credit: Acknowledgment of the NOAA Office for Coastal Management (OCM) as the 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

Data Steward

CC ID: 620516
Date Effective From: 2017
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

Distributor

CC ID: 620518
Date Effective From: 2017
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: 620519
Date Effective From: 2017
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: 620517
Date Effective From: 2017
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: Publication Date

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 620522
W° Bound: -91.02
E° Bound: -75.74
N° Bound: 49.61
S° Bound: 40.75

Extent Group 1 / Time Frame 1

CC ID: 620521
Time Frame Type: Discrete
Start: 2017

Access Information

Security Class: Unclassified
Data Access Procedure:

This data may be downloaded at https://coast.noaa.gov/llv;

Data Access Constraints:

None

Data Use Constraints:

These data illustrate the scale of potential water level decrease and increase, not the exact location, and do not account for erosion, subsidence,

or future construction. Water level is shown as it would appear based on each lake's long term average water level over the period of record (1918-2003)

(excludes wind driven effects) with one foot increments of water level decrease or increase. These data should be used only as a screening-level tool for

management decisions. As with all remotely sensed data, all features should be verified with a site visit. The data set 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 data set

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: 620514
URL: https://coast.noaa.gov/llv
URL Type:
Online Resource

URL 2

CC ID: 620515
URL: https://coast.noaa.gov/digitalcoast/tools/llv
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 620555
Activity Date/Time: 2017-07-05
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 620554
Activity Date/Time: 2017-11-14
Description:

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 Quality

Completeness Report:

These data are complete. Data supplied are from the most current elevation data available at the time of creation. Gaps may exist, but these are due

to a lack of available elevation data at the time of data set creation.

Conceptual Consistency:

Standard methods for determining water level decrease and increase were used. The vertical accuracy of these data is dependent on the source elevation

data.

Lineage

Sources

NOAA OCM Digital Elevation Models

CC ID: 620511
Contact Name: NOAA Office for Coastal Management (OCM)
Publish Date: 2017-01-01
Extent Type: Discrete
Extent Start Date/Time: 2017
Citation URL: https://coast.noaa.gov/llv
Source Contribution:

The digital elevation model (DEM) of an area serves as one of two source datasets used to derive water level change outputs. | Type of Source Media: online digital data

Process Steps

Process Step 1

CC ID: 620512
Description:

The process to derive the rasters and polygons is as follows:

1. A water level surface is generated for each lake using each lake's long term average water level over the period of record (1918-2003). Each 1 foot

iteration (from -6 feet to + 6 feet) of water level was either subtracted or added to this base water level surface and subsequently used for mapping.

2. Using the DEM and the water level surface (for each 1 foot iteration of drop or rise), raster calculations are made using ArcGIS Spatial Analyst

Raster Calculation tool to generate multiple rasters, one 32-bit floating point raster representing the depth of water level and one 8-bit single value

raster representing the extent of water level.

Process Date/Time: 2017-01-01 00:00:00

Catalog Details

Catalog Item ID: 48103
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-14 14:15+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2019-07-02 15:17+0000
Metadata Record Published: 2017-11-16
Owner Org: OCM
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Next Review Date: 2018-11-17