Metadata: Identification_Information: Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 20160506 Title: Lidar-Derived Classified Bare-Earth Point-Cloud for Coastal Topography—Assateague Island, Maryland and Virginia, Post-Hurricane Joaquin, 26 November 2015 Edition: first Geospatial_Data_Presentation_Form: binary point cloud Series_Information: Series_Name: U.S. Geological Survey Data Release Issue_Identification: doi:10.5066/F70P0X4G Publication_Information: Publication_Place: St. Petersburg, FL Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.5066/F70P0X4G Description: Abstract: Binary point-cloud data were produced for Assateague Island, Maryland and Virginia, post-Hurricane Joaquin, from remotely sensed, geographically referenced elevation measurements collected by Quantum Spatial using a Leica ALS70 (1064-nm wavelength) lidar sensor. Purpose: The purpose of this project was to produce a highly detailed and accurate digital elevation map for Assateague Island, Maryland and Virginia for use as a management tool and to make these data available to natural-resource managers and research scientists. To ensure that SPCMSC data management protocols were followed, this survey was assigned a USGS field activity number (FAN), 2015-344-FA. Additional survey and data details are available at http://cmgds.marine.usgs.gov/fan_info.php?fan=2015-344-FA. USGS Contract: G10PC00026 Task Order Number: G16PD00038 Supplemental_Information: Processed data products are used by the U.S. Geological Survey (USGS) CMGP's National Assessment of Coastal Change Hazards project to quantify the vulnerability of shorelines to coastal change hazards such as severe storms, sea-level rise, and shoreline erosion and retreat. Lidar_Information: Lidar_Collection_Information: Lidar_Specification: USGS-NGP Base Specification v1.2 Lidar_Sensor: Leica_ALS70 Lidar_Maximum_Returns: 4 Lidar_Nominal_Pulse_Spacing: 0.69 Lidar_Nominal_Pulse_Density: 2.12 Lidar_Aggregate_Nominal_Pulse_Spacing: 0.69 Lidar_Aggregate_Nominal_Pulse_Density: 2.12 Lidar_Flight_Height: 2051 Lidar_Flight_Speed: 160 Lidar_Scan_Angle: 20.0 Lidar_Scan_Frequency: 53.4 Lidar_Pulse_Rate: 263.4 Lidar_Pulse_Duration: 4 Lidar_Pulse_Width: 0.47 Lidar_Central_Wavelength: 1064 Lidar_Multiple_Pulses_In_Air: 1 Lidar_Beam_Divergence: 0.22 Lidar_Swath_Width: 1510.48 Lidar_Swath_Overlap: 10.80 Lidar_Geoid: National Geodetic Survey (NGS) GEOID12B Lidar_Accuracy_Information: Lidar_Calculated_Horizontal_Accuracy: 0.196 Lidar_Raw_Nonvegetated_Vertical_Accuracy: 0.080 Lidar_Raw_Nonvegetated_Vertical_Accuracy_Checkpoints: 13 Lidar_Classified_Nonvegetated_Vertical_Accuracy: 0.082 Lidar_Classified_Nonvegetated_Vertical_Accuracy_Checkpoints: 13 Lidar_Classified_Vegetated_Vertical_Accuracy: 0.185 Lidar_Classified_Vegetated_Vertical_Accuracy_Checkpoints: 12 Lidar_LAS_Information: Lidar_LAS_Version: 1.4 Lidar_LAS_Point_Record_Format: 6 Lidar_LAS_Witheld_Point_Identifier: Withheld (ignore) points were identified in these files using the standard LAS Withheld bit Lidar_LAS_Overage_Point_Identifier: Swath "overage" points were identified in these files using the standard LAS overlap bit Lidar_LAS_Radiometric_Resolution: 6 Lidar_LAS_Classification: Lidar_LAS_Class_Code: 1 Lidar_LAS_Class_Description: Processed, but unclassified Lidar_LAS_Classification: Lidar_LAS_Class_Code: 2 Lidar_LAS_Class_Description: Bare-earth ground Lidar_LAS_Classification: Lidar_LAS_Class_Code: 7 Lidar_LAS_Class_Description: Low noise Lidar_LAS_Classification: Lidar_LAS_Class_Code: 9 Lidar_LAS_Class_Description: Water Lidar_LAS_Classification: Lidar_LAS_Class_Code: 10 Lidar_LAS_Class_Description: Ignored Ground Lidar_LAS_Classification: Lidar_LAS_Class_Code: 17 Lidar_LAS_Class_Description: Bridge Decks Lidar_LAS_Classification: Lidar_LAS_Class_Code: 18 Lidar_LAS_Class_Description: High noise Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 20151126 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -75.42950193 East_Bounding_Coordinate: -75.07387345 North_Bounding_Coordinate: 38.33961735 South_Bounding_Coordinate: 37.83866023 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:f3055d6c-a8ad-477e-b979-a21cc09ed112 Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: elevation Theme: Theme_Keyword_Thesaurus: General Theme_Keyword: Digital Elevation Model Theme_Keyword: DEM Theme_Keyword: extratropical cyclone Theme_Keyword: laser altimetry Theme_Keyword: lidar Theme_Keyword: Piper Navajo Theme_Keyword: remote sensing Theme_Keyword: shoreline Theme_Keyword: topography Theme: Theme_Keyword_Thesaurus: Global Change Master Science Directory Theme_Keyword: LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION Theme_Keyword: OCEAN > COASTAL PROCESSES > BARRIER ISLANDS Theme_Keyword: OCEAN > COASTAL PROCESSES > BEACHES Theme_Keyword: OCEAN > COASTAL PROCESSES > SHORELINE DISPLACEMENT Theme_Keyword: DOI/USGS/CMG > COASTAL AND MARINE GEOLOGY, U.S. GEOLOGICAL SURVEY, U.S. DEPARTMENT OF INTERIOR Theme: Theme_Keyword_Thesaurus: GCMD Instrument Theme_Keyword: LIDAR > LIGHT DETECTION AND RANGING Theme: Theme_Keyword_Thesaurus: Data Categories for Marine Planning Theme_Keyword: distributions Theme_Keyword: bathymetry and elevation Theme: Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) Keywords Theme_Keyword: altimetry Theme_Keyword: topographic mapping Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: LIDAR Theme_Keyword: topography Theme_Keyword: digital elevation models Place: Place_Keyword_Thesaurus: Geographic Names Information System Place_Keyword: Assateague Island Place_Keyword: Maryland Place_Keyword: Virginia Place_Keyword: Delmarva Peninsula Place_Keyword: United States Stratum: Stratum_Keyword_Thesaurus: General Stratum_Keyword: Bare Earth Temporal: Temporal_Keyword_Thesaurus: General Temporal_Keyword: 2015 Temporal_Keyword: Post-Hurricane Joaquin Access_Constraints: None Use_Constraints: Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. The U.S. Geological Survey requests to be acknowledged as originator of these data in future products or derivative research. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Xan Fredericks Contact_Organization: Cherokee Nation Technologies, U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center, St. Petersburg, FL Contact_Position: Lidar Validation and Processing Analyst Contact_Address: Address_Type: mailing and physical address Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: 727 502-8086 Contact_Facsimile_Telephone: 727 502-8182 Contact_Electronic_Mail_Address: afredericks@usgs.gov Hours_of_Service: M-F, 8:00-4:00 ET Data_Set_Credit: Acknowledgment of the U.S. Geological Survey, St. Petersburg Coastal and Marine Science 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. Sharing of new data layers developed directly from these data would also be appreciated by the U.S. Geological Survey staff. Users should be aware that comparisons with other datasets for the same area from other periods may be inaccurate because of inconsistencies resulting from changes in photointerpretation, mapping conventions, and digital processes over time. These data are not legal documents and are not to be used as such. Security_Information: Security_Classification_System: Unclassified Security_Classification: Unclassified Security_Handling_Description: None Native_Data_Set_Environment: Microsoft Windows 7 Enterprise Service Pack 1; Esri ArcCatalog 10.2.2.3552 Data_Quality_Information: Logical_Consistency_Report: Quantum Spatial reports that data cover the entire area specified for this project. Completeness_Report: Quantum Spatial reports that these raw LAS data files include all data points collected and that no points have been removed or excluded. Quantum Spatial performed a visual qualitative assessment to ensure data completeness and reported no void areas or missing data exist. Quantum Spatial reports that the raw point cloud is of good quality and data passes Nonvegetated Vertical Accuracy specifications. Positional_Accuracy: Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Quantum Spatial reports that the contract specifications required that only Nonvegetated Vertical Accuracy (NVA) were computed for raw lidar point cloud swath files. The vertical accuracy was tested with 13 independent surveys located in open terrain. These check points were not used in the calibration or post-processing of the lidar point cloud data. The survey check points were distributed throughout the project area. The independent check points were surveyed using the closed level loop technique. Elevations from the unclassified lidar surface were measured for the x,y location of each check point. Elevations interpolated from the lidar surface were then compared to the elevation values of the surveyed control. The RMSE was computed to be 0.042. AccuracyZ has been tested as 0.082 meters AccuracyZ at 95 percent Confidence Interval, meeting 19.6 cm NVA at 95 percent confidence level using (RMSEz * 1.9600) as defined by the National Standards for Spatial Data Accuracy (NSSDA); assessed and reported using National Digital Elevation Program (NDEP)/American Society of Photogrammetry and Remote Sensing (ASPRS) Guidelines. Lineage: Process_Step: Process_Description: Classified LAS Creation: The bare-earth surface is then manually reviewed to ensure correct classification on the Class 2 (Ground) points. After the bare-earth surface is finalized, it is then used to generate all hydro-breaklines through heads-up digitization. All ground (ASPRS Class 2) LiDAR data inside of the lake/pond and double-line drain hydro-flattening breaklines were then classified to water (ASPRS Class 9) using TerraScan macro functionality. A buffer of 1 meter was also used around each hydro-flattened feature to classify these ground (ASPRS Class 2) points to ignored ground (ASPRS Class 10). All lake/pond island and double-line drain island features were checked to ensure that the ground (ASPRS Class 2) points were reclassified to the correct classification after the automated classification was completed. All bridge decks were classified to Class 17. All overlap data were processed through automated functionality provided by TerraScan to classify the overlapping flight line data to approved classes by USGS. The overlap data were identified using the Overlap Flag, per LAS 1.4 specifications. All data were manually reviewed and any remaining artifacts removed using functionality provided by TerraScan and TerraModeler. Global Mapper was used as a final check of the bare-earth dataset. GeoCue was then used to create the deliverable industry-standard LAS files for both the unclassified point-cloud data and the bare-earth data. Quantum Spatial proprietary software was used to perform final statistical analysis of the classes in the LAS files, on a per-tile level to verify final classification metrics and full LAS header information. Process_Date: 2015 Source_Produced_Citation_Abbreviation: Classified LAS Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Quantum Spatial Contact_Address: Address_Type: mailing and physical Address: 523 Wellington Way City: Lexington State_or_Province: KY Postal_Code: 40503 Country: USA Contact_Voice_Telephone: 859-277-8700 Contact_Facsimile_Telephone: 859-277-8901 Hours_of_Service: Monday through Friday 8:00 AM to 5:00 PM (Eastern Time) Process_Step: Process_Description: Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog. Process_Date: 20170104 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Alan O. Allwardt Contact_Position: Contractor -- Information Specialist Contact_Address: Address_Type: mailing and physical address Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-460-7551 Contact_Facsimile_Telephone: 831-427-4748 Contact_Electronic_Mail_Address: aallwardt@usgs.gov Process_Step: Process_Description: Added keywords section with USGS persistent identifier as theme keyword. Process_Date: 20201013 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: VeeAnn A. Cross Contact_Position: Marine Geologist Contact_Address: Address_Type: Mailing and Physical Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: 508-548-8700 x2251 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: vatnipp@usgs.gov Spatial_Data_Organization_Information: Indirect_Spatial_Reference: Tile Direct_Spatial_Reference_Method: Point Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 18 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -75.000000 Latitude_of_Projection_Origin: 0 False_Easting: 500000.000000 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.01 Ordinate_Resolution: 0.01 Planar_Distance_Units: meters 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: 298.25722210100002 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Altitude_Datum_Name: North American Vertical Datum of 1988 (GEOID12B) Altitude_Resolution: 0.15 Altitude_Distance_Units: meters Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Xan Fredericks Contact_Position: Lidar Validation and Processing Analyst, Cherokee Nation Technologies Contact_Address: Address_Type: mailing and physical address Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: 727 502-8086 Hours_of_Service: M-F, 8:00-4:00 ET Resource_Description: ASIS2015_HRJQ_BE_z18_n88g12B_classified.laz Distribution_Liability: Although these data have been processed successfully on a computer system at the USGS, no warranty expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The USGS shall not be held liable for improper or incorrect use of the data described and/or contained herein. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: Compressed LAS (LAZ) Format_Version_Number: 1.4 Format_Specification: Compressed LAS (LAZ) Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://coastal.er.usgs.gov/data-release/doi-F70P0X4G/data/ASIS2015_HRJQ_BE_z18_n88g12B_classified.laz Fees: None Custom_Order_Process: Contact U.S. Geological Survey for details. Metadata_Reference_Information: Metadata_Date: 20201102 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Xan Fredericks Contact_Organization: Cherokee Nation Technology Solutions, U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center, St. Petersburg, FL Contact_Position: Lidar Validation and Processing Analyst Contact_Address: Address_Type: mailing and physical address Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: 727 803-8747 (x3086) Contact_Electronic_Mail_Address: afredericks@usgs.gov Hours_of_Service: M-F, 8:00-4:00 ET Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time