2009-2010 USACE Vicksburg District Lidar: Mississippi Phase II

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator:

Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Office for Coastal Management (OCM)

Originator: United State Army Corps of Engineers (USACE) Vicksburg District

Originator: Aerometric Optimal, Inc.

Publication_Date: 20160523

Title: 2009-2010 USACE Vicksburg District Lidar: Mississippi Phase II

Geospatial_Data_Presentation_Form: las

Publication_Information:

Publication_Place: Charleston, SC

Publisher: NOAA's Ocean Service, Office for Coastal Management (OCM)

Online_Linkage: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=2600

Online_Linkage: https://coast.noaa.gov/htdata/lidar1_z/geoid12a/data/2600

Online_Linkage: https://coast.noaa.gov/dataviewer

Online_Linkage: https://coast.noaa.gov

Description:

Abstract:

This data set is an LAZ (compressed LAS) format file containing LIDAR point cloud data. Phase two will consist of post processing of the data collected. Aeroquest Optimal, Inc. shall process the digital elevation data from a precision airborne (LIDAR) survey within the entire project area. The proposed project area is approximately 6.3 million acres. The purpose of the survey is to obtain measurements of the bare ground surface, as well as top surface feature elevation data for providing geometry input to USACE hydraulic modeling program. This project for USACE, Vicksburg District was to provide digital orthophotography using DMC imagery for approximately 4,120 square miles located in NW Mississippi at a 2-foot pixel resolution.

Purpose:

The purpose of this survey is to provide the Vicksburg District with bare earth and top surface elevation data for providing geometry input to USACE hydraulic modeling programs.

Supplemental_Information:

A footprint of this data set may be viewed in Google Earth at: https://coast.noaa.gov/htdata/lidar1_z/geoid12a/data/2600/supplemental/ms2009_2010_usace_phaseII.KMZ Reports explaining collection and quality assurance is available at: https://coast.noaa.gov/htdata/lidar1_z/geoid12a/data/2600/supplemental/ms2009_2010_usace_phaseII.pdf

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20091217

Ending_Date: 20100709

Currentness_Reference: ground condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -90.0886487

East_Bounding_Coordinate: -88.8334027

North_Bounding_Coordinate: 34.9810040

South_Bounding_Coordinate: 33.6759277

Keywords:

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category

Theme_Keyword: elevation

Theme:

Theme_Keyword_Thesaurus: none

Theme_Keyword: Topography

Theme_Keyword: Elevation

Theme_Keyword: Model

Theme_Keyword: LiDAR

Theme_Keyword: LAZ

Theme_Keyword: LAS

Theme_Keyword: Remote Sensing

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: US

Place_Keyword: Mississippi

Place_Keyword: Desoto County

Place_Keyword: Tate County

Place_Keyword: Marshall County

Place_Keyword: Benton County

Place_Keyword: Tippah County

Place_Keyword: Union County

Place_Keyword: Panola County

Place_Keyword: Lafayette County

Place_Keyword: Pontotoc County

Place_Keyword: Yalobusha County

Place_Keyword: Chickasaw County

Place_Keyword: Calhoun County

Place_Keyword: Grenada County

Access_Constraints: None

Use_Constraints:

Users should be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions. Users should not use this data for critical applications without a full awareness of its limitations. These data depict the heights at the time of the survey and are only accurate for that time.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Elijah C. Hunt

Contact_Organization: U.S. Army Corps of Engineers, Vicksburg District

Contact_Address:

Address_Type: mailing and physical address

Address: 4155 East Clay St

City: Vicksburg

State_or_Province: MS

Postal_Code: 39183-3435

Country: USA

Contact_Voice_Telephone: (601) 631-7040

Contact_Electronic_Mail_Address: elijah.c.hunt@us.army.mil

Browse_Graphic:

Browse_Graphic_File_Name:

https://coast.noaa.gov/htdata/lidar1_z/geoid12a/data/2600/supplemental/ms2009_2010_usace_phaseII.KMZ

Browse_Graphic_File_Description:

This graphic shows the lidar coverage for the 2009-2010 Phase II collection area in Mississippi.

Browse_Graphic_File_Type: kmz

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

Elevations are recorded in floating-point meters and the vertical datum is ellipsoidal (GEOID03).

Logical_Consistency_Report:

Analysis of parallel acquisitioned EO shows a RMS of 1.801ft , 2.101 ft and 3.100 ft for XYZ, respectively.

Completeness_Report:

LiDAR data has been collected and processed for all areas within the project study area.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Expected accuracies are not tested accuracies. OPTECH ALTM 3100 LiDAR Sensor - Expected horizontal accuracy of elevation products as determined from system studies and other methods is 1/2,000th of the flight height, which, in the instance of this particular project, was 3,280 U.S. survey feet (1,000 meters) AGL, giving a horizontal tolerance of less than 1.640 U.S. survey feet (0.500 meters). OPTECH ALTM 3100EA LiDAR Sensor - Expected horizontal accuracy of elevation products as determined from system studies and other methods is 1/5,500th of the flight height which, in the instance of this particular project, was 3,280 U.S. survey feet (1,000 meters) AGL, giving a horizontal tolerance of less than 0.596 U.S. survey feet (0.182 meters). OPTECH ALTM Gemini LiDAR Sensor - Expected horizontal accuracy of elevation products as determined from system studies and other methods is 1/11,000th of the flight height, which, in the instance of this particular project, was 5,905 U.S. survey feet (1,800 meters) AGL, giving a horizontal tolerance of less than 0.537 U.S. survey feet (0.164 meters). Horizontal positional accuracy for LiDAR is dependent upon the quality of the GPS/INS solution, sensor calibration and ground conditions at the time of data capture. The standard system results for horizontal accuracy are less than 1 meter. Not tested therefore horizontal accuracy is assumed as 1.0 m.

Quantitative_Horizontal_Positional_Accuracy_Assessment:

Horizontal_Positional_Accuracy_Value: 1.0

Horizontal_Positional_Accuracy_Explanation: See LiDAR data report.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

The LiDAR data was tested against control points established using RTK GPS techniques. Six-hundred and seventy-nine (679) test points were collected throughout the project area in several vegetation categories. The RMSE calculations were performed on the bare-earth, orthometric surface and determined for each of the four LiDAR acquisition areas separately.

Quantitative_Vertical_Positional_Accuracy_Assessment:

Vertical_Positional_Accuracy_Value: 0.11

Vertical_Positional_Accuracy_Explanation:

The following statements are derived in accordance with the ASPRS Guidelines for Vertical Accuracy Reporting for LiDAR Data (Flood, M., 2004). Tested 0.365 U.S. survey feet (0.111 meters) fundamental vertical accuracy at the ninety-five percent confidence level in open terrain using RMSEz x 1.9600. Tested 0.431 U.S. survey feet (0.131 meters) consolidated vertical accuracy at the ninety-five percent confidence level in open terrain, high grass and trees using RMSEz x 1.9600.

Lineage:

Process_Step:

Process_Description:

During acquisition, two base stations were used to support the precise positioning and orientation of the LiDAR sensor head. At times an additional base station set at the Oxford Airport was used as a back-up. The base stations were positioned so that the aircraft would be no further than 20-miles from a single base station at any time during the flight and were placed on the control points established by Maptech during the ground control phase of the project. The LiDAR acquisition commenced on December 17, 2009 and was completed on March 5, 2010. Initial processing of the LiDAR data determined that reflights were necessary; in part because of sensor or base station malfunctions. The reflights occurred between June 27, 2010 and July 9, 2010. To achieve better penetration of the vegetation during the reflights, two passes were conducted over the reflight area; one in each direction. Detailed flight information and flight logs can be found in the separate Flight Report submitted with the project.

Process_Date: 20100305

Process_Step:

Process_Description:

For redundancy and accuracy purposes, the airborne GPS data were processed from two base stations using POSGPS from Applanix, Inc. The agreement between a minimum of two solutions checked or combined between a minimum of two stations was better than 10 cm in each of X, Y, and Z. These trajectories were used in the processing of the inertial data. The inertial data were processed using POSProc from Applanix, Inc. This software produces an SBET ("smooth best estimate of trajectory") using the GPS trajectory from POSGPS and the roll, pitch and heading information recorded by the POS (Position Orientation System). DASHMap uses the SBET to generate a set of data points for each laser return in the LAS file format. Each data point is assigned an echo value so it can be segregated based on the first and last pulse information. This project's data were processed in strip form, meaning each flight line was processed independently. Processing the lines individually provides the data analyst with the ability to QC the overlap between lines. Each strip was then imported into a project using TerraScan (Terrasolid, Ltd.) and the project management tool GeoCue (GeoCue Corp.). By creating a project the various flightlines are combined while breaking the dataset as a whole into manageable pieces. This process also converts the dataset from the geographic coordinate system (NAD83) to the State Plane Coordinate System (NAD83), Mississippi West, Feet, and utilizing standard ESRI transformations. The ellipsoid height values were converted to NAVD88, Feet, orthometric values using Geoid03, provided by NGS. Individual lines were then checked against adjacent lines and intersecting control lines to ensure a cohesive dataset. The data from each line were then combined and LiDAR intensity images were produced to visually check the horizontal positioning of the LiDAR data. Stereo pairs were generated from the LiDAR intensity data using Geocue and LiDAR1CuePac (Geocue Corp.). LiDARgrammetry was then utilized to collect breaklines where necessary along hydro features to support the contour generation. These breaklines were collected as a 3D element in the MicroStation (Bentley Systems, Inc.) environment utilizing ISSD (Z/I Imaging). A Triangular Irregular Network (TIN) was generated using the final surface data. Contours were then created from the TIN utilizing TerraModeler (Terrasolid, Ltd.).

Process_Date: Unknown

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Chris Jaeger

Contact_Organization: Aeroquest Optimal, Inc.

Contact_Position: Project Manager

Contact_Address:

Address_Type: mailing and physical address

Address: 4975 Bradford Dr. NW, Ste 100

City: Huntsville

State_or_Province: AL

Postal_Code: 35805

Country: USA

Contact_Voice_Telephone: (256) 882-7788

Contact_Electronic_Mail_Address: chris.jaeger@optimalgeo.com

Process_Step:

Process_Description:

The NOAA Office for Coastal Management (OCM) received topographic files in text format from the Mississippi Department of Environmental Quality (MDEQ). The files contained lidar easting, northing and elevation. The data were received in Mississippi State Plane West 2302, NAD83 coordinates and were vertically referenced to NAVD88 using the Geoid03 model. The vertical and horizontal units of the data were feet. OCM performed the following processing for data storage and Digital Coast provisioning purposes: 1. The ASCII files were converted from txt format to las format using LASTools' txt2las 2. The LAS tiles were retiled to remove the buffer, then duplicate points were removed 3. The LAS tiles were then run through LASGround in order to extract surface classifications. 4. The las files were converted from orthometric (NAVD88) heights to ellipsoidal heights using Geoid03. 5. The las files' vertical units were converted from feet to meters, removing bad elevations. 6. The las files were converted from a Projected Coordinate System (MS SP West) to a Geographic Coordinate system (NAD83) 7. The las files' horizontal units were converted from feet to decimal degrees and converted to laz format.

Process_Date: 20131220

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: NOAA Office for Coastal Management

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: 843-740-1202

Contact_Electronic_Mail_Address: coastal.info@noaa.gov

Process_Step:

Process_Description:

The vertical values in this data set have been converted to reference North American Vertical Datum of 1988 (NAVD88), using the GEOID12A grids provided by the National Geodetic Survey. Any datum and projection transformations were then done with the Office for Coastal Management 'datum_shift' program. Compression to an LAZ file was done with the LAStools 'laszip' program and can be unzipped with the same free program (laszip.org)

Process_Date: 20160523

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Point

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 1e-07

Longitude_Resolution: 1e-07

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: 298.257222

Vertical_Coordinate_System_Definition:

Altitude_System_Definition:

Altitude_Datum_Name: North American Vertical Datum of 1988 (NAVD88)

Altitude_Resolution: 0.01

Altitude_Distance_Units: meters

Altitude_Encoding_Method:

Explicit elevation coordinate included with horizontal coordinates

Entity_and_Attribute_Information:

Overview_Description:

Entity_and_Attribute_Overview: LiDAR points in LAZ format (ASPRS Classes 1,2)

Entity_and_Attribute_Detail_Citation: none

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: NOAA Office for Coastal Management

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: 843-740-1202

Contact_Electronic_Mail_Address: coastal.info@noaa.gov

Resource_Description: Downloadable Data

Distribution_Liability:

Any conclusions drawn from the analysis of this information are not the responsibility of Aeroquest Optimal, Inc., MDEQ, USACE, NOAA, the Office for Coastal Management or its partners.

Custom_Order_Process:

This data can be obtained on-line at the following URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=2600

Metadata_Reference_Information:

Metadata_Date: 20160523

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: NOAA Office for Coastal Management

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: 843-740-1202

Contact_Electronic_Mail_Address: coastal.info@noaa.gov

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998