Identification_Information: Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 2009 Title: ATM Coastal Topography--Louisiana, 2001: UTM Zone 15 (Part 1 of 2) Edition: first Geospatial_Data_Presentation_Form: remote-sensing image Series_Information: Series_Name: U.S. Geological Survey Data Series Issue_Identification: 464 Publication_Information: Publication_Place: St. Petersburg, FL Publisher: U.S. Geological Survey Description: Abstract: A first-surface elevation map was produced cooperatively from remotely sensed, geographically referenced elevation measurements by the U.S. Geological Survey (USGS) and National Aeronautics and Space Administration (NASA). Elevation measurements were collected over the area using the NASA Airborne Topographic Mapper (ATM), a scanning lidar system that measures high-resolution topography of the land surface. The ATM system is deployed on a Twin Otter or P-3 Orion aircraft and incorporates a green-wavelength laser operating at pulse rates of 2 to 10 kilohertz. Measurements from the laser-ranging device are coupled with data acquired from inertial navigation system (INS) attitude sensors and differentially corrected global positioning system (GPS) receivers to measure topography of the surface at accuracies of +/-15 centimeters. Purpose: The purpose of this project is to produce highly detailed and accurate elevation maps of a portion of the Louisiana coastline within UTM Zone 15 for natural-resource managers and research scientists. For the corresponding Louisiana coastline data within UTM Zone 16, refer to USGS Data Series 464 (part 2 of 2). Supplemental_Information: Raw 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 Program (CMGP) has developed custom software to convert raw 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. The zero crossing of the second derivative (that is, detection of local maxima) is used to detect "first surface" topography. Statistical filtering, known as the Random Consensus Filter (RCF), is used to remove false bottom returns and other outliers from the ATM topography data. The filter uses a grid of non-overlapping square cells (buffer) of user-defined size overlaid onto the original point cloud. The user also defines the vertical tolerance (vertical width) based on the topographic complexity and point sampling density of the data. The maximum allowable elevation range within a cell is established by this vertical tolerance. An iterative process searches for the maximum concentration of points within the vertical tolerance and removes those points outside of the tolerance (Nayegandhi and others, 2009). These data are converted to the North American Datum of 1983 and the North American Vertical Datum of 1988 (using the GEOID03 model). The files are in the Quarter-Quad tiling format, and the exact tile location is contained in the filename at ########_fs, where ####### is the Quarter-Quad tile ID. The development of custom software for creating these data products has been supported by the USGS CMG Program's Decision Support for Coastal Parks, Sanctuaries, and Preserves Project. Processed data products are used by the USGS 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: Multiple_Dates/Times: Single_Date/Time: Calendar_Date: 20010907 Single_Date/Time: Calendar_Date: 20010910 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: 698898.992986843 East_Bounding_Coordinate: 791743.992986843 North_Bounding_Coordinate: 3237446.25031041 South_Bounding_Coordinate: 3214681.25031041 Keywords: Theme: Theme_Keyword_Thesaurus: http://remotesensing.usgs.gov/ Theme_Keyword: Airborne Lidar Processing System Theme_Keyword: ALPS Theme_Keyword: DEM Theme_Keyword: Digital Elevation Model Theme_Keyword: ATM Theme_Keyword: Airborne Topographic Mapper Theme_Keyword: laser altimetry Theme_Keyword: lidar Theme_Keyword: remote sensing Theme_Keyword: topography Place: Place_Keyword_Thesaurus: http://nationalmap.gov/ Place_Keyword: Louisiana Place_Keyword: UTM Zone 15 Place_Keyword: Gulf of Mexico 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: 2001 Access_Constraints: None Use_Constraints: The U.S. Geological Survey and National Aeronautics and Space Administration request to be acknowledged as originators of the dataset in future products or derivative research. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Xan Yates Contact_Organization: Jacobs Technology, U.S. Geological Survey, FISC Contact_Position: GIS/Image Analyst/Metadata Specialist 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: xyates@usgs.gov Contact_Electronic_Mail_Address: anayegandhi@usgs.gov Hours_of_Service: M-F, 9:00-5:30 EST Data_Set_Credit: Acknowledgment 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 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 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, Amar, Brock, J.C., Wright, C.W. Publication_Date: 2009 Title: Small footprint, waveform-resolving lidar estimation of submerged and subcanopy topography in coastal environments Series_Information: Series_Name: International Journal of Remote Sensing Issue_Identification: 30(4), p. 861-878 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: The expected accuracy of the measured variables is as follows: attitude within 0.07 degree, 3-centimeter nominal laser ranging accuracy, and vertical elevation accuracy of +/-15 centimeters for the topographic surface. Quality checks are built into the data-processing software. Logical_Consistency_Report: The files are in the Quarter-Quad tiling format, and the exact tile location is contained in the filename at ########_fs, where ####### is the Quarter-Quad tile ID. See the DOQQ naming convention document in the 'extras' directory. Completeness_Report: Several regions of the dataset are labeled as "No Data," which corresponds to a cell value of -32767 meters in the GeoTIFF file. These "No Data" areas are a result of the survey not covering a particular region (for example, behind the beach face), optical water depth of greater than 1.5 Secchi disc depths, or the manual removal of lidar processing artifacts. The presence of "No Data" values does not necessarily indicate an absence of land; rather,"No Data" can indicate an absence of survey coverage. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Raw elevation measurements have been determined to be within 1 meter in horizontal accuracy. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Elevations of the DEM are vertically consistent with the point elevation data, +/-15 centimeters. Lineage: Process_Step: Process_Description: The data are collected using a Twin Otter aircraft. The NASA Airborne Topographic Mapper (ATM) laser scanner collects the data using a green raster scanning laser. The data are stored on hard drives and archived at the U.S. Geological Survey's FISC office in St. Petersburg, FL, and the NASA office at Wallops Flight Facility in Virginia. The navigational data are processed at Wallops Flight Facility. The navigational and raw 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: 20011012-20090417 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Amar Nayegandhi Contact_Organization: Jacobs Technology, U.S. Geological Survey, FISC, St. Petersburg, FL Contact_Position: Computer Scientist 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 (x3026) Contact_Electronic_Mail_Address: anayegandhi@usgs.gov Hours_of_Service: M-F, 8:00-5:00 EST Process_Step: Process_Description: Metadata imported into ArcCatalog from XML file. Process_Date: 20090417 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Xan Yates Contact_Organization: Jacobs Technology, U.S. Geological Survey, FISC, St. Petersburg, FL Contact_Position: GIS/Image Analyst/Metadata Specialist 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: xyates@usgs.gov Hours_of_Service: M-F, 8:00-5:00 EST Spatial_Data_Organization_Information: Indirect_Spatial_Reference: Quater-Quadrangle Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Pixel Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 15 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -93.000000 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: 1.000000 Ordinate_Resolution: 1.000000 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: 298.257222101 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Altitude_Datum_Name: North American Vertical Datum of 1988 Altitude_Resolution: 0.15 meters Altitude_Distance_Units: meters Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: This Digital Elevation Model is a GeoTIFF. It is raster data consisting of cells. Each cell has an elevation value associated with it. The input parameters for the random consensus filter (RCF) were as follows: grid cell size (buffer) = 8 meters by 8 meters; vertical tolerance (vertical width) = 20 centimeters. The variables measured by ATM are distance between aircraft and GPS satellites (meters), attitude information (roll, pitch, heading in degrees), scan angle (degrees), second of the epoch (seconds), and 1-nanosecond time-resolved return intensity waveform (digital counts). Z value is referenced to orthometric elevations derived from National Geodetic Survey Geoid Model, GEOID03. Entity_and_Attribute_Detail_Citation: http://pubs.usgs.gov/of/2009/1078/ 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: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: 727-803-8747 (x3026) Hours_of_Service: M-F, 8:00-5:00 EST Resource_Description: DS 464 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 herein 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: 2 Format_Specification: GeoTIFF Digital_Transfer_Option: Offline_Option: Offline_Media: DVD Recording_Format: DVD Fees: Vary Ordering_Instructions: Contact U.S. Geological Survey Turnaround: Varies Custom_Order_Process: Contact U.S. Geological Survey for details. Available_Time_Period: Time_Period_Information: Multiple_Dates/Times: Single_Date/Time: Calendar_Date: 20010910 Single_Date/Time: Calendar_Date: 20010907 Metadata_Reference_Information: Metadata_Date: 20090417 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Xan Yates Contact_Organization: Jacobs Technology, U.S. Geological Survey, FISC, St. Petersburg, FL Contact_Position: GIS/Image Analyst/Metadata Specialist Contact_Address: Address_Type: mailing 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: xyates@usgs.gov Hours_of_Service: M-F, 8:00-5:00 EST 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