Identification_Information: Citation: Citation_Information: Originator: Julie C. Bernier Publication_Date: 2017 Title: Elevation Data Collected in 2010 from Sabine National Wildlife Refuge, Louisiana Geospatial_Data_Presentation_Form: Tabular digital data, vector digital data Publication_Information: Publication_Place: St. Petersburg, FL Publisher: U.S. Geological Survey Online_Linkage: http://dx.doi.org/10.5066/F7BR8QBH/ Description: Abstract: Data release doi:10.5066/F7BR8QBH associated with this metadata record serves as an archive of elevation data collected in August 2010 from Sabine National Wildlife Refuge (SNWR), Louisiana (U.S. Geological Survey [USGS] Field Activity Number [FAN] 10SWL01). Point (xyz) elevations were collected from historically formed open-water bodies and the surrounding emergent marsh using a combination of stop-and-go (semi-kinematic) and kinematic differential Global Positioning System (DGPS) surveying techniques. These data were collected as part of the U.S. Geological Survey’s Gulf Coast Subsidence project https://coastal.er.usgs.gov/gc-subsidence/) and provide more extensive spatial coverage than water depths and marsh-surface elevations collected along coring transects in 2008 (Bernier and others, 2011). All elevation data use the projected coordinate system North American Datum of 1983 (NAD83), Universal Transverse Mercator (UTM) Zone 15 North (15N) and all elevations are North American Vertical Datum of 1988 (NAVD88) orthometric heights, derived using the GEOID09 geoid model. Purpose: Dissemination of processed emergent-marsh and open-water sediment-surface elevation data collected from Sabine National Wildlife Refuge, Louisiana in August 2010 (USGS FAN 10SWL01). The elevation data were used to estimate magnitudes of one-dimensional (vertical) and three-dimensional (volume) accommodation that formed as a result of extensive historical wetland loss in the western chenier plain of coastal Louisiana. Supplemental_Information: A limited number of water depths were collected along coring transects at four study areas in 2008 (Bernier and others, 2011). During this survey, DGPS position and elevation data were collected at two of the 2008 study areas (study areas 2 and 3) and also at two additional study areas (study areas 5 and 6). DGPS position data were not collected at study areas 1 and 4 due to time constraints and the fragmented nature of the emergent marshes and small open-water bodies at these sites. These data are scientific in nature and are not to be used for navigation. Bathymetric grids interpolated from these point elevations should be used with caution because data density varied between study areas and did not provide full coverage, especially within irregular embayments at the study-area margins. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20100804 Ending_Date: 20100813 Currentness_Reference: Ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -93.66202 East_Bounding_Coordinate: -93.43298 North_Bounding_Coordinate: 29.96446 South_Bounding_Coordinate: 29.88808 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: elevation Theme_Keyword: geoscientificInformation Theme_Keyword: inlandWaters Theme_Keyword: location Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: geology Theme_Keyword: geomorphology Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: elevation Theme_Keyword: differential Global Positioning System Theme_Keyword: DGPS Theme_Keyword: stop-and-go Theme_Keyword: kinematic Theme_Keyword: wetland loss Theme_Keyword: accommodation Theme_Keyword: chenier plain Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: Louisiana Place_Keyword: Sabine National Wildlife Refuge Access_Constraints: None Use_Constraints: The U.S. Geological Survey requests that it be acknowledged as the originator of this dataset in any future products or research derived from these data. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Julie C. Bernier Contact_Position: Geologist Contact_Address: Address_Type: Mailing and physical Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: 727-502-8000 Contact_Electronic_Mail_Address: jbernier@usgs.gov Data_Set_Credit: U.S. Geological Survey, Coastal and Marine Geology Program, St. Petersburg Coastal and Marine Science Center Native_Data_Set_Environment: Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.3.1.4959 Cross_Reference: Citation_Information: Originator: Bernier, J.C. Originator: Morton, R.A. Originator: Kelso, K.W. Publication_Date: 2011 Title: Trends and Causes of Historical Wetland Loss, Sabine National Wildlife Refuge, Southwest Louisiana Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: 2011-1169 Online_Linkage: http://pubs.usgs.gov/of/2011/1169/ Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: The positional accuracy of the processed data is determined by the accuracy of the raw position data recorded during data collection. DGPS coordinates were obtained using post-processing software packages (National Geodetic Survey On-Line Positioning User Service, OPUS, and Waypoint Product Group GrafNav, version 8.30). Logical_Consistency_Report: Position and elevation data were recorded with an Ashtech DGPS receiver and choke-ring antenna. A combination of stop-and-go (semi-kinematic) and fully kinematic differential GPS (DGPS) surveying techniques were used to measure the emergent-marsh and open-water sediment-surface elevations. DGPS data were recorded concurrently throughout the survey at nearby base stations using a similar instrument combination. The final point (xyz) data, including elevation, are the post-processed DGPS coordinates; baseline distances were less than 13 km. Completeness_Report: Data release doi:10.5066/F7BR8QBH associated with this metadata record includes the processed elevation data for 1120 point locations collected from Sabine National Wildlife Refuge, Louisiana in August 2010 (USGS FAN 10SWL01). Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: All static base station sessions were processed through the On-Line Positioning User Service (OPUS) maintained by the National Geodetic Survey (NGS). The OPUS base-station solutions were entered into a spreadsheet to compute a final, time-weighted positional coordinate (latitude, longitude, and ellipsoid height). Base-station positional error was calculated as the absolute value of the final weighted solution minus the session position value. The maximum horizontal error of the base station coordinates used for post-processing was 0.0028 seconds latitude and 0.0040 seconds longitude. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: All static GPS base station sessions were processed through OPUS. The OPUS base-station solutions were entered into a spreadsheet to compute a final, time-weighted positional coordinate (latitude, longitude, and ellipsoid height). Base-station positional error for each GPS session was calculated as the absolute value of the final weighted solution minus the session position value. For this survey, the standard deviation of the base station ellipsoid height was 0.005 m and the maximum vertical error for the base station was +/- 0.016 m. Lineage: Process_Step: Process_Description: Position and elevation data were recorded with an Ashtech DGPS receiver and antenna. GPS base stations were erected at temporary USGS benchmarks located within 13 km of the farthest data-collection site. An Ashtech Z-Xtreme GPS receiver recorded the 12-channel full-carrier-phase positioning signals (L1/L2) from satellites via a Thales choke-ring antenna at the base station. A similar GPS instrument combination was used for the rover GPS. The base receiver and the rover receiver recorded their positions concurrently at 1-second (s) recording intervals throughout the survey. Because the SNWR open-water bodies are very shallow (generally less than 50 cm) and commonly have fluid muddy or peaty bottom sediments, an airboat was required to access the study areas, and a combination of stop-and-go (semi-kinematic) and fully kinematic differential GPS (DGPS) surveying techniques were used. At pre-selected sites along the transects, the airboat was brought to a complete stop, spudded onsite, and the rover antenna was lowered to the sediment surface. At these "stop" sites, data recorded in static mode for 2 minutes. Between stop sites, the antenna was pinned in the up position while data continued to record in kinematic mode and the real-time position data from the rover GPS receiver was streamed to a laptop computer running HYPACK 2010 hydrographic survey software. At approximately equal distances between stop sites, the distance from the antenna foot to the sediment surface was measured with a graduated rod and the time and approximate (raw) position of each measurement were marked simultaneously in the HYPACK data file. After post processing, the vertical position of each kinematic epoch with a corresponding HYPACK timestamp was corrected to account for the measured distance between the antenna foot and the sediment surface. As a quality-control check, rod measurements were also made at each of the stop sites before the rover antenna was lowered to the sediment surface, and the corrected kinematic elevation was compared with the static elevation from the same site. Process_Date: 2010 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Julie C. Bernier Contact_Position: Geologist Contact_Address: Address_Type: Mailing and physical Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: 727-502-8000 Contact_Electronic_Mail_Address: jbernier@usgs.gov Process_Step: Process_Description: The coordinate values of the GPS base stations are the time-weighted average of values obtained from OPUS. The base station coordinates were imported into GrafNav, version 8.30 (Waypoint Product Group) and the data from the rover GPS were post-processed to the concurrent base-station session data; baseline distances were less than 13 km. The DGPS data were acquired and processed in the North American Datum of 1983 (NAD83) (CORS96) geodetic datum. Processed ellipsoid elevations were transformed in GrafNav to North American Vertical Datum of 1988 (NAVD88) orthometric elevations using the National Geodetic Survey geoid model of 2009 (GEOID09). Process_Date: 2011 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Julie C. Bernier Contact_Position: Geologist Contact_Address: Address_Type: Mailing and physical Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: 727-502-8000 Contact_Electronic_Mail_Address: jbernier@usgs.gov Process_Step: Process_Description: The processed stop-and-go and kinematic point data were imported into Esri ArcGIS version 9.3, the kinematic elevations were corrected to account for the measured distance between the antenna foot and the sediment surface, and the differences between the processed static and kinematic elevations at all stop sites were compared. The average kinematic-minus-static difference for all stop sites (N=271) was 0.5 plus-or-minus 8.3 cm (2-sigma), which is comparable to the maximum error (plus-or-minus 10 cm) at line crossings for single-beam acoustical bathymetric surveys in the delta plain (Morton and others, 2010). The stop-and-go and kinematic datasets were then merged; the final point data are the stop-and-go static positions where applicable or the corrected kinematic elevations. Process_Date: 2011 Source_Produced_Citation_Abbreviation: snwr_mu1_sa2_elev2010.csv Source_Produced_Citation_Abbreviation: snwr_mu1_sa6_elev2010.csv Source_Produced_Citation_Abbreviation: snwr_mu3_sa5_elev2010.csv Source_Produced_Citation_Abbreviation: snwr_mu5_sa3_elev2010.csv Source_Produced_Citation_Abbreviation: snwr_elev2010_all.csv Source_Produced_Citation_Abbreviation: snwr_elev2010_all.shp Source_Produced_Citation_Abbreviation: snwr_elev2010_all.kml Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Julie C. Bernier Contact_Position: Geologist Contact_Address: Address_Type: Mailing and physical Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: 727-502-8000 Contact_Electronic_Mail_Address: jbernier@usgs.gov Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Point Point_and_Vector_Object_Count: 1120 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: 0.9996 Longitude_of_Central_Meridian: 93.0 Latitude_of_Projection_Origin: 0.0 False_Easting: 500000.0 False_Northing: 0.0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.001 Ordinate_Resolution: 0.001 Planar_Distance_Units: Meters 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: Attribute values Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: snwr_mu1_sa2_elev2010.csv Entity_Type_Definition: Comma-separated values text file containing the processed point location and elevation data for study area 2 located in SNWR Management Unit 1. Entity_Type_Definition_Source: USGS Detailed_Description: Entity_Type: Entity_Type_Label: snwr_mu1_sa6_elev2010.csv Entity_Type_Definition: Comma-separated values text file containing the processed point location and elevation data for study area 6 located in SNWR Management Unit 1. Entity_Type_Definition_Source: USGS Detailed_Description: Entity_Type: Entity_Type_Label: snwr_mu3_sa5_elev2010.csv Entity_Type_Definition: Comma-separated values text file containing the processed point location and elevation data for study area 5 located in SNWR Management Unit 3. Entity_Type_Definition_Source: USGS Detailed_Description: Entity_Type: Entity_Type_Label: snwr_mu5_sa3_elev2010.csv Entity_Type_Definition: Comma-separated values text file containing the processed point location and elevation data for study area 3 located in SNWR Management Unit 5. Entity_Type_Definition_Source: USGS Detailed_Description: Entity_Type: Entity_Type_Label: snwr_elev2010_all.csv Entity_Type_Definition: Comma-separated values text file containing all processed point location and elevation data for SNWR study areas 2, 3, 5, and 6. Entity_Type_Definition_Source: USGS Detailed_Description: Entity_Type: Entity_Type_Label: snwr_elev2010_all.shp Entity_Type_Definition: Esri shapefile containing all processed point location and elevation data for SNWR study areas 2, 3, 5, and 6. Entity_Type_Definition_Source: USGS Detailed_Description: Entity_Type: Entity_Type_Label: snwr_elev2010_all.kml Entity_Type_Definition: Keyhole Markup Language (KML) file containing all processed point location and elevation data for SNWR study areas 2, 3, 5, and 6. Entity_Type_Definition_Source: USGS Attribute: Attribute_Label: FID Attribute_Definition: Internal feature number Attribute_Definition_Source: Esri Attribute_Domain_Values: Unrepresentable_Domain: Sequential unique whole numbers that are automatically generated Attribute: Attribute_Label: Shape Attribute_Definition: Feature geometry Attribute_Definition_Source: Esri Attribute_Domain_Values: Unrepresentable_Domain: Geometry type defining the features Attribute: Attribute_Label: NAD83_X Attribute_Definition: X-coordinate (easting) of sample point, in meters (NAD83, UTM zone 15N) Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 436125.681 Range_Domain_Maximum: 458193.103 Attribute_Units_of_Measure: Meters Attribute_Measurement_Resolution: 0.001 Attribute: Attribute_Label: NAD83_Y Attribute_Definition: Y-coordinate (northing) of sample point, in meters (NAD83, UTM zone 15N) Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 3306567.886 Range_Domain_Maximum: 3314926.203 Attribute_Units_of_Measure: Meters Attribute_Measurement_Resolution: 0.001 Attribute: Attribute_Label: NAD83_Z Attribute_Definition: Ellipsoid height of sample point, in meters (NAD83) Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -27.801 Range_Domain_Maximum: -26.662 Attribute_Units_of_Measure: Meters Attribute_Measurement_Resolution: 0.001 Attribute: Attribute_Label: NAVD88_G09 Attribute_Definition: Elevation (orthometric height) of sample point, in meters (NAD83, GEOID09) Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -0.661 Range_Domain_Maximum: 0.468 Attribute_Units_of_Measure: Meters Attribute_Measurement_Resolution: 0.001 Attribute: Attribute_Label: SOURCE Attribute_Definition: Elevation data collection method used Attribute_Definition_Source: USGS Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Static Enumerated_Domain_Value_Definition: Reported position and elevation data are the processed stop-and-go static site coordinates Enumerated_Domain_Value_Definition_Source: USGS Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Rod Enumerated_Domain_Value_Definition: Reported position and elevation data are the rod-corrected processed kinematic site coordinates Enumerated_Domain_Value_Definition_Source: USGS Attribute: Attribute_Label: LOCATION1 Attribute_Definition: Study area where data was collected Attribute_Definition_Source: USGS Attribute_Domain_Values: Unrepresentable_Domain: Character string Attribute: Attribute_Label: LOCATION2 Attribute_Definition: SNWR management unit where data was collected Attribute_Definition_Source: USGS Attribute_Domain_Values: Unrepresentable_Domain: Character string Attribute: Attribute_Label: COMMENT Attribute_Definition: Additional site information Attribute_Definition_Source: USGS Attribute_Domain_Values: Unrepresentable_Domain: Character string Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center Contact_Person: Julie C. Bernier Contact_Position: Geologist Contact_Address: Address_Type: Mailing and physical Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: 727-502-8000 Contact_Electronic_Mail_Address: jbernier@usgs.gov Resource_Description: Downloadable data Distribution_Liability: This 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, or for general or scientific purposes, 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: Compressed (zip) archive Format_Version_Date: 2017 Format_Specification: Multimedia presentation Format_Information_Content: This zip archive includes comma-separated values text files (.csv), GIS data files in Esri shapefile (.shp) and Keyhole Markup Language (KML) format, and accompanying metadata for elevation data collected in 2010 from Sabine National Wildlife Refuge, Louisiana (USGS FAN 10SWL01). File_Decompression_Technique: Unzip Transfer_Size: 0.2 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://coastal.er.usgs.gov/data-release/doi-F7BR8QBH/data/snwr_elev2010.zip Fees: None, if obtained online Technical_Prerequisites: GIS files can be opened using the free ArcGIS Explorer or Google Earth GIS viewers. Metadata_Reference_Information: Metadata_Date: 20170221 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Julie C. Bernier Contact_Position: Geologist Contact_Address: Address_Type: Mailing and physical Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: 727-502-8000 Contact_Electronic_Mail_Address: jbernier@usgs.gov Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Access_Constraints: None Metadata_Use_Constraints: Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Metadata_Security_Information: Metadata_Security_Classification_System: None Metadata_Security_Classification: Unclassified Metadata_Security_Handling_Description: None