NOAA Office for Coastal Management Coastal Digital Elevation Model: Lake St. Clair

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 NOAA Lake Level Viewer. It depicts potential lake level rise and fall 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 lake level change, coastal flooding impacts, and exposed lakeshore. 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 NOAA Lake Level Viewer may be accessed at: https://coast.noaa.gov/llv.

This metadata record describes the Lake St. Clair 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 Lake Level 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 Macomb, St. Clair, and Wayne counties in Michigan.

The DEM was produced from the following lidar data sets:

1. 2006, USACE NCMP Topobathy Lidar: Lake Erie (OH, PA), Lake Huron (MI) and Lake Michigan (Porter County, IN)

2. 2009, USGS Wayne and Washtenaw County Lidar

3. 2010, ARRA-MI_4SECounties

4. 2012, USACE NCMP Topobathy Lidar: Lake St. Clair (MI)

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

The NOAA Office for Coastal Management has developed high-resolution digital elevation models (DEMs) for use in the Office's Lake Level Viewer internet mapping application. These DEMs serve as source datasets used to derive data to visualize the impacts of inundation and shore exposure resulting from lake level change along the coastal United States in the Great Lakes.

10977

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

1. 2006, USACE NCMP Topobathy Lidar: Lake Erie (OH, PA), Lake Huron (MI) and Lake Michigan (Porter County, IN)

Metadata: https://coast.noaa.gov/data/Documents/Metadata/Lidar/no_harvest/usace2006_gl_m40_metadata.xml

Data Download: https://coast.noaa.gov/htdata/lidar1_z/geoid12a/data/40

2. 2009, USGS Wayne and Washtenaw County Lidar

Metadata: https://coast.noaa.gov/data/Documents/Metadata/Lidar/harvest/mi2009_usgs_wayne_washtenaw_m4809_metadata.xml

Data Download: https://coast.noaa.gov/htdata/lidar1_z/geoid12a/data/4809/

3. 2010, ARRA-MI_4SECounties

Metadata: https://coast.noaa.gov/data/Documents/Metadata/Lidar/harvest/mi2010_arra_4_county_se_m5019_metadata.xml

Data Download: https://coast.noaa.gov/htdata/lidar1_z/geoid12b/data/5019/

4. 2012, USACE NCMP Topobathy Lidar: Lake St. Clair (MI)

Metadata: https://coast.noaa.gov/data/Documents/Metadata/Lidar/no_harvest/mi2012_usace_stclair_m3667_metadata.xml

Data Download: https://coast.noaa.gov/htdata/lidar1_z/geoid12a/data/3667/

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

Vertical_Coordinate_System_Definition:

Altitude_System_Definition:

Altitude_Datum_Name: North American Vertical Datum of 1988

Altitude_Resolution: 0.001

Altitude_Distance_Units: meters

Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates

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

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.

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.

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.

A visual qualitative check was performed to ensure data completeness. All available lidar and sonar 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 and sonar coverage was incomplete.

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