Identification_Information: Citation: Citation_Information: Originator: Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Coastal Services Center (CSC) Publication_Date: 201312 Title: NOAA Coastal Services Center Coastal Inundation Digital Elevation Model: Prince George's County, Maryland Geospatial_Data_Presentation_Form: Raster Publication_Information: Publication_Place: Charleston, SC Publisher: NOAA's Ocean Service, Coastal Services Center (CSC) Online_Linkage: http://www.csc.noaa.gov/digitalcoast/tools/slrviewer Online_Linkage: http://www.csc.noaa.gov Description: Abstract: These data were created as part of the National Oceanic and Atmospheric Administration Coastal Services Center'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 (slr) 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: http://www.csc.noaa.gov/slr This metadata record describes the digital elevation model (DEM), which is a part of a series of DEMs produced for the National Oceanic and Atmospheric Administration Coastal Services Center's Sea Level Rise and Coastal Flooding Impacts Viewer described above. This DEM includes the best available data known to exist at the time of DEM creation that met project specifications, for Prince George's County, Maryland. The DEM is derived from the following lidar: Prince George's County, Maryland Washington, DC and Environs, 2008, 1/9 Arc second National Elevation Dataset (NED) This data may be downloaded at: http://viewer.nationalmap.gov/viewer/ Hydrographic breaklines were delineated from LiDAR intensity imagery generated from the LiDAR datasets. The DEM is hydro flattened such that water elevations are less than or equal to 0 meters. 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 10 meters. Purpose: The NOAA Coastal Services Center has developed high-resolution digital elevation models (DEMs) for use in the Center'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. Supplemental_Information: The National Elevation Dataset is available at: http://viewer.nationalmap.gov/viewer/ Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20120115 Ending_Date: 20120813 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: East_Bounding_Coordinate: North_Bounding_Coordinate: South_Bounding_Coordinate: Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: elevation Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Bathymetry/Topography Theme_Keyword: elevation Theme_Keyword: Digital Elevation Model Theme_Keyword: DEM Theme_Keyword: lidar Theme_Keyword: inundation Theme_Keyword: flooding Theme_Keyword: lidar Theme_Keyword: topography Theme_Keyword: sea level rise Place: Place_Keyword_Thesaurus: None Place_Keyword: United States Place_Keyword: Maryland Place_Keyword: Prince George's County Access_Constraints: None 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. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: NOAA Coastal Services Center Contact_Address: Address_Type: mailing and physical Address: 2234 South Hobson Ave. City: Charleston State_or_Province: SC Postal_Code: 29405-2413 Contact_Voice_Telephone: 843-740-1200 Contact_Electronic_Mail_Address: csc.info@noaa.gov Hours_of_Service: M-F, 9:00-5:00 EST Data_Set_Credit: Acknowledgment of the NOAA Coastal Services Center 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_Quality_Information: Logical_Consistency_Report: Data covers the tile scheme provided for the project area. Elevation data checked for anomalous elevation values outside expected range. 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. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: 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: Vertical_Positional_Accuracy_Report: 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. Lineage: Process_Step: Process_Description: This process was not used for PG county. Remove this info when this County is merged into existing MD metadata. Keil just obtained the elevation data from the 1/9 NED for this county. Wait for word from Billy. 1.The dataset listed in the Abstract were used to develop the DEM. 2.Hydrographic breaklines were delineated from lidar intensity imagery generated from the dataset. Process_Date: 2013 Process_Step: Process_Description: GeoCue software was used to develop LiDAR intensity imagery from the lidar. The raster resolution was 1 ft or 0.3 m. Process_Date: 2013 Process_Step: Process_Description: LiDAR intensity images were viewed in 2-D in ArcMap. Hydrographic features were collected as 2D breaklines. Process_Date: 2013 Process_Step: Process_Description: Class 2, ground LiDAR points are exported from the LAS files into an Arc Geodatabase (GDB) in multipoint format. Hydro breaklines are assigned an elevation of -0.5 meters and loaded into an Arc GDB. An ESRI Terrain is generated from these inputs. Process_Date: 2013 Process_Step: Process_Description: The ESRI Terrain is converted to a DEM in Erdas image file format with a cell size of 3 meters. The DEM is reviewed in Global Mapper for incorrect elevations and artifacts that are introduced from source inputs or during the raster creation process. Corrections are applied to the DEMs and reprocessed for review. Process_Date: 2013 Process_Step: Process_Description: All DEMs are loaded into Global Mapper for the last review. During this last review, an analyst checks to ensure full, complete coverage, no issues along DEM boundaries, DEMs seamlessly edge-match, and that there are no remaining processing artifacts in the dataset. Once approved, DEMs are re-projected to the NAD83 geographic coordinate system. Process_Date: 2013 Process_Step: Process_Description: For data distribution purposes, NOAA CSC converted the cell resolution of the DEM from 3 meters to 10 meters. Process_Date: 2013 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Grid Cell Row_Count: Column_Count: Vertical_Count: 1 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.0000001 Longitude_Resolution: 0.0000001 Geographic_Coordinate_Units: Decimal degrees Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 Ellipsoid_Name: Geodetic Reference System 80 Semi-major_Axis: 6378137.000000 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 Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: NOAA Coastal Services Center Contact_Address: Address_Type: mailing and physical Address: 2234 South Hobson Ave. City: Charleston State_or_Province: SC Postal_Code: 29405-2413 Contact_Voice_Telephone: 843-740-1200 Contact_Electronic_Mail_Address: csc.info@noaa.gov Resource_Description: Downloadable Data Distribution_Liability: Any conclusions drawn from the analysis of this information are not the responsibility of the NOAA Coastal Services Center or its partners. Metadata_Reference_Information: Metadata_Date: 20131216 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: NOAA Coastal Services Center Contact_Address: Address_Type: mailing and physical Address: 2234 South Hobson Avenue City: Charleston State_or_Province: SC Postal_Code: 29405-2413 Contact_Voice_Telephone: 843-740-1200 Contact_Electronic_Mail_Address: csc.info@noaa.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998