Identification_Information: Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 2008 Publication_Time: Unknown Title: EAARL Coastal Topography - Northern Gulf of Mexico, 2007: First surface Edition: first Geospatial_Data_Presentation_Form: remote-sensing image Series_Information: Series_Name: Data Series Issue_Identification: 399 Publication_Information: Publication_Place: Saint Petersburg, FL Publisher: U.S. Geological Survey Description: Abstract: A first surface elevation map (also known as a Digital Elevation Model, or DEM) of the northern Gulf of Mexico barrier islands and Naval Live Oaks was produced from remotely sensed, geographically referenced elevation measurements cooperatively by the U.S. Geological Survey (USGS), the National Park Service (NPS), and the National Aeronautics and Space Administration (NASA). Elevation measurements were collected over the area using the NASA Experimental Advanced Airborne Research Lidar (EAARL), a pulsed-laser ranging system mounted onboard an aircraft to measure ground elevation, vegetation canopy, and coastal topography. The system uses high-frequency laser beams directed at the Earth's surface through an opening in the bottom of the aircraft's fuselage. The laser system records the time difference between emission of the laser beam and the reception of the reflected laser signal in the aircraft. The plane travels over the target area at approximately 50 meters per second at an elevation of approximately 300 meters. The EAARL, developed by NASA at Wallops Flight Facility in Virginia, measures ground elevation with a vertical resolution of 15 centimeters. A sampling rate of 3 kilohertz or higher results in an extremely dense spatial elevation dataset. Over 100 kilometers of coastline can be surveyed easily within a 3- to 4-hour mission. When subsequent elevation maps for an area are analyzed, they provide managers with a useful tool to make management decisions regarding land development. Purpose: The purpose of this project was to produce a highly detailed and accurate first surface digital elevation map of the northern Gulf of Mexico barrier islands for use as a management tool and to make these data available to natural resource managers and research scientists. Supplemental_Information: Unprocessed Lidar data are not in a format that is generally usable by resource managers and scientists. Converting dense Lidar elevation data into a readily usable format without loss of essential information requires specialized processing. The U.S. Geological Survey's Coastal and Marine Geology (CMG) Program has developed custom software to convert unprocessed Lidar data into a GIS-compatible map product to be provided to GIS specialists, managers, and scientists. The primary tool used in the conversion process is Advanced Lidar Processing System (ALPS), a multi-tiered processing system developed by a USGS-NASA collaborative project. Specialized processing algorithms are used to convert unprocessed waveform Lidar data acquired by the EAARL to georeferenced spot (x,y,z) returns for "first surface" topography. These data are then converted to the North American Datum of 1983 and the North American Vertical Datum of 1988 (using the GEOID 03 model). The files are in the Quarter-Quad tiling format and are named after the U.S. Geological Survey Alpha Quarter-Quad naming convention ('QQ_naming_convention.doc'). The development of custom software for creating these data products has been supported by the U.S. Geological Survey CMG Program's Decision Support for Coastal Parks, Sanctuaries, and Preserves project. Processed data products are used by the U.S. Geological Survey CMG Program's National Assessments 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. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20070627 Ending_Date: 20070630 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: 4 East_Bounding_Coordinate: 3 North_Bounding_Coordinate: 1 South_Bounding_Coordinate: 2 Keywords: Theme: Theme_Keyword_Thesaurus: http://remotesensing.usgs.gov/ Theme_Keyword: Lidar Theme_Keyword: Experimental Advanced Airborne Research Lidar Theme_Keyword: EAARL Theme_Keyword: Digital Elevation Model Theme_Keyword: elevation change Theme_Keyword: laser altimetry Theme_Keyword: derived surface Theme_Keyword: resource management Theme_Keyword: ALPS Theme_Keyword: Advanced Lidar Processing System Theme_Keyword: Hurricanes Place: Place_Keyword_Thesaurus: http://nationalmap.gov/ Place_Keyword: Florida Place_Keyword: Mississippi Place_Keyword: Alabama Place_Keyword: Gulf of Mexico Place_Keyword: Cat Island Place_Keyword: Petit Bois Island Place_Keyword: Dauphin Island Place_Keyword: Chandeleur Islands Place_Keyword: Horn Island Place_Keyword: Ship Island Place_Keyword: Santa Rosa Island Place_Keyword: Perdido Key Place_Keyword: Naval Live Oaks Stratum: Stratum_Keyword_Thesaurus: http://lidar.cr.usgs.gov/ Stratum_Keyword: First surface Temporal: Temporal_Keyword_Thesaurus: http://www.esri.com/news/arcuser/1104/temporal.html Temporal_Keyword: 2007 Access_Constraints: None Use_Constraints: The U.S. Geological Survey, National Park Service, and National Aeronautics and Space Administration request to be acknowledged as originators of this data in future products or derivative research. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Jacobs Technology, contracted to USGS Contact_Person: Amar Nayegandhi or John Brock at USGS Contact_Position: Computer Scientist Contact_Address: Address_Type: mailing and physical address Address: 600 4th Street South City: Saint Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: 727-803-8747 (x3026) Contact_Electronic_Mail_Address: anayegandhi@usgs.gov Contact_Electronic_Mail_Address: jbrock@usgs.gov Hours_of_Service: M-F 8:30-5:00 EST Data_Set_Credit: Acknowledgement of the U.S. Geological Survey, Florida Integrated Science Center, as a data source would be appreciated in products developed from these data, and such acknowledgement as is standard for citation and legal practices for data source is expected by users of this data. Sharing 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 time periods may be inaccurate due to 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 XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcMap 9.2.2.1350 Cross_Reference: Citation_Information: Originator: Nayegandhi, A., Brock, J.C., Wright, C.W Publication_Date: In Press Title: Small footprint, waveform-resolving lidar estimation of submerged and sub-canopy topography in coastal environments Series_Information: Series_Name: International Journal of Remote Sensing Publication_Information: Publication_Place: London Publisher: Taylor and Francis Cross_Reference: Citation_Information: Originator: Brock, J.C., Wright, C.W., Sallenger, A.H., Krabill, W.B., and Swift, R.N. Publication_Date: 2002 Title: Basis and methods of NASA Airborne Topographic Mapper lidar surveys for coastal studies Edition: 18(1), pp. 1-13 Series_Information: Series_Name: Journal of Coastal Research Issue_Identification: 18(1), p. 1-13 Publication_Information: Publisher: Coastal Research and Education Foundation, Inc. Cross_Reference: Citation_Information: Originator: Sallenger, A.H., Wright, C.W., and Lillycrop, J. Publication_Date: 2005 Title: Coastal impacts of the 2004 hurricanes measured with airborne Lidar; initial results Edition: 73(2-3), p. 10-14 Series_Information: Series_Name: Shore and Beach Issue_Identification: 73(2-3), p. 10-14 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: The expected accuracy of the measured variables are as follows: attitude within 0.07 degree, 3 cm nominal laser ranging accuracy, and vertical elevation accuracy of +/-15 cm for the topographic surface. Quality checks are built into the data-processing software. Logical_Consistency_Report: Each file contains data located in USGS 24K Quarter-Quadrangle tile and are named after the USGS Alpha Quarter-Quad naming convention. AAOOOaoq, where AA is the positive whole number component of the latitude. OOO is the positive whole number component of the longitude (zero-padded to a width of 3); a is an alpha character a-h designating the quad in the degree of latitude; where a is closest to 0 minutes and h is closest to the next full degree. Each represents 1/8 of a degree; o is a numeral 1-8 designating the quad in the degree of longitude, where 1 is closest to 0 minutes and 8 is closest to the next full degree. Each represents 1/8 of a degree; q is an alpha character a-d designating which quarter in the quad, where a is SE, b is NE, c is NW, and d is SW. Each Quarter-Quad is 1/16 of a degree in latitude and 1/16 of a degree in longitude. Completeness_Report: Several regions of the dataset are labeled as "No Data", which corresponds to a cell value of -32767 m in the GeoTIFF file. These "No Data" areas are a result of the survey not covering a particular region, optical water depth of greater than 1.5 Secchi disc depths, or the manual removal of lidar processing artifacts. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Unprocessed elevation measurements have been determined to be within 1 meter horizontal accuracy. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Elevations of the DEM are vertically consistent with the point elevation data, +/-15 cm. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 2008 Publication_Time: Unknown Title: EAARL Coastal Topography - Northern Gulf of Mexico, 2007: First surface Edition: first Geospatial_Data_Presentation_Form: remote-sensing image Series_Information: Series_Name: Data Series Issue_Identification: 399 Publication_Information: Publication_Place: St. Petersburg Publisher: U.S. Geological Survey Source_Scale_Denominator: 1 Type_of_Source_Media: Point elevation measurements collected by the EAARL sensor. Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20070627 Ending_Date: 20070630 Source_Currentness_Reference: ground condition Source_Citation_Abbreviation: none Source_Contribution: unknown Process_Step: Process_Description: The data are collected using a Cessna 310 aircraft. The NASA Experimental Advanced Airborne Research Lidar (EAARL) laser scanner collects the data using a green (532 nm) raster scanning laser, while a digital camera acquires a visual record of the flight. The data are stored on hard drives and archived at the U.S. Geological Surveym office in St. Petersburg and the NASA office at Wallops Flight Facility. The navigational data are processed at Wallops Flight Facility. The navigational and unprocessed data are then downloaded into the Advanced Lidar Processing System (ALPS). Data are converted from units of time to x,y,z points for elevation. The derived surface data can then be converted into raster data (geoTIFFS). Process_Date: 20070627 - 20080805 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Jacobs Technology, U.S. Geological Survey, FISC, St. Petersburg Contact_Person: Amar Nayegandhi Contact_Position: Computer Scientist Contact_Address: Address_Type: mailing and physical address Address: 600 4th Street South City: Saint Petersburg State_or_Province: FL Postal_Code: 33703 Country: USA Contact_Voice_Telephone: 727-803-8747 (x3026) Contact_Electronic_Mail_Address: anayegandhi@usgs.gov Hours_of_Service: M-F, 8:00-5:00 EST Spatial_Data_Organization_Information: 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: 16 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -87.000000 Latitude_of_Projection_Origin: 0.000000 False_Easting: 500000.000000 False_Northing: 0.000000 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: row and column Coordinate_Representation: Abscissa_Resolution: 2.000000 Ordinate_Resolution: 2.000000 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: 298.257222 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Altitude_Datum_Name: North American Vertical Datum of 1988 Altitude_Resolution: 0.15 m Altitude_Distance_Units: meters Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: Each pixel of the encoded GeoTIFF has an explicit elevation value associated with it. The GeoTIFF grid is encoded with a 1-meter resolution. Entity_and_Attribute_Detail_Citation: The variables measured by EAARL are: distance between aircraft and GPS satellites (m), attitude information (roll, pitch, heading in degrees), scan angle (degrees), second of the epoch (sec), and 1-ns time-resolved return intensity waveform (digital counts). Z value is referenced to orthometric elevations derived from National Geodetic Survey Geoid Model, GEOID03. Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Project Manager Contact_Position: Project Manager Contact_Address: Address_Type: mailing address Address: 600 4th Street South City: Saint Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: 727 803-8747 Hours_of_Service: M-F 8:30-5:00 EST Resource_Description: DS 399 Distribution_Liability: This DVD publication was prepared by an agency of the United States Government. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, nor shall the act of distribution imply any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Reference herin to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: TIFF Format_Version_Number: 1.1 Format_Specification: LAS Digital_Transfer_Option: Offline_Option: Offline_Media: DVD Recording_Format: DVD Fees: vary Ordering_Instructions: Contact U.S. Geological Survey Turnaround: vary Custom_Order_Process: Contact U.S. Geological Survey for details Available_Time_Period: Time_Period_Information: Single_Date/Time: Calendar_Date: 2008 Metadata_Reference_Information: Metadata_Date: 20080307 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Metadata Specialist Contact_Position: Metadata Specialist Contact_Address: Address_Type: mailing address Address: 600 4th Street South City: Saint Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: 727-803-8747 Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile