Mississippi River Delta Project Contract: W912EE-07-D-0005

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Photo Science, Inc.

Publication_Date: Unpublished Material

Title:

Mississippi River Delta Project Contract: W912EE-07-D-0005

Geospatial_Data_Presentation_Form: LAS Files

Description:

Abstract:

LiDAR collected at 1.0 points per square meter (1.0m GSD) for the entire portion of the Mississippi River Delta in the Vicksburg District. This area was flown during snow free and leaf-off conditions.

Purpose:

Lifts were planned to meet project specifications and were flown under cloud-free conditions in order to collect LiDAR points at an average of 1.0 meter point spacing. This allows the user to create Intensity Images, Break Lines, and fully Classified LiDAR LAS files.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20090219

Ending_Date: 20100802

Currentness_Reference: Ground Condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: Unknown

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -91.263987

East_Bounding_Coordinate: -89.716395

North_Bounding_Coordinate: 35.080227

South_Bounding_Coordinate: 32.299483

Keywords:

Theme:

Theme_Keyword_Thesaurus: none

Theme_Keyword: Model

Theme_Keyword: LiDAR

Theme_Keyword: DEM

Theme_Keyword: Raster

Theme_Keyword: Breaklines

Theme_Keyword: Contours

Theme_Keyword: ASCII

Theme_Keyword: TIN

Theme_Keyword: Remote Sensing

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: Mississippi

Place_Keyword: Warren

Place_Keyword: Issaquena

Place_Keyword: Yazoo

Place_Keyword: Sharkey

Place_Keyword: Holmes

Place_Keyword: Humphreys

Place_Keyword: Washington

Place_Keyword: Sunflower

Place_Keyword: Leflore

Place_Keyword: Carroll

Place_Keyword: Bolivar

Place_Keyword: Grenada

Place_Keyword: Tallahatchie

Place_Keyword: Yalobusha

Place_Keyword: Coahoma

Place_Keyword: Quitman

Place_Keyword: Panola

Place_Keyword: Tunica

Place_Keyword: Tate

Place_Keyword: DeSoto

Place_Keyword: US

Access_Constraints: None

Use_Constraints:

None. However, users should be aware that temporal changes may have occurred since this data set was collected and that some parts of the data may no longer represent actual surface conditions. Users should not use the data for critical applications without a full awareness of it's limitations.

Data_Set_Credit: Photo Science, Inc. flew and processed the LiDAR data.

Native_Data_Set_Environment:

MicroStation Version 8; TerraScan Version 10; Optech DASHMap 4.1801; TerraModeler Version 10; GeoCue Version 6.1.21.4; ESRI ArcGIS 9.3.1; ALS Post Processor 2.70 Build #15; Windows XP Operating System

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

The project area requires LiDAR to be collected on average of 1.0 meter point spacing or better and vertical accuracy of 15.0 centimeters RMSE or better to support 2' contour generation when combined with breaklines.

Logical_Consistency_Report:

Deliverables were tested by both Photo Science for both vertical and horizontal accuracy. All data are seamless from one tile to the next, no gaps or no-data areas exists.

Completeness_Report: Datasets contain complete coverage of tiles.

Positional_Accuracy:

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

Deliverables were tested by both Photo Science for both vertical and horizontal accuracy. All data are seamless from one tile to the next, no gaps or no-data areas exists. The vertical unit of the data file is in survey feet with 2-decimal point precision.

Quantitative_Vertical_Positional_Accuracy_Assessment:

Vertical_Positional_Accuracy_Value: 0.09

Vertical_Positional_Accuracy_Explanation: RMSE in Meters

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: Photo Science, Inc.

Publication_Date: 2010

Title: LiDAR

Geospatial_Data_Presentation_Form: digital data

Type_of_Source_Media: hard drive

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20090219

Ending_Date: 20100802

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: LiDAR

Source_Contribution: LiDAR points were used to produce the deliverables.

Process_Step:

Process_Description:

Applanix software was used in the post processing of the airborne GPS and inertial data that is critical to the positioning and orientation of the sensor during all flights. POSPac MMS provides the smoothed best estimate of trajectory (SBET) that is necessary for Optech's post processor to develop the point cloud from the LiDAR missions. The point cloud is the mathematical three dimensional collection of all returns from all laser pulses as determined from the aerial mission. At this point this data is ready for analysis, classification, and filtering to generate a bare earth surface model in which the above ground features are removed from the data set. The point cloud was manipulated within the Optech or Leica software; GeoCue, TerraScan, and TerraModeler software was used for the automated data classification, manual cleanup, and bare earth generation from this data. Project specific macros were used to classify the ground and to remove the side overlap between parallel flight lines. All data was manually reviewed and any remaining artifacts removed using functionality provided by TerraScan and TerraModeler. Class 2 LIDAR was used to create a bare earth surface model. The surface model was then used to heads-up digitize 2D breaklines of inland streams and rivers with a 30 foot nominal width and Inland Ponds and Lakes of 0.25 acres or greater. Elevation values were assigned to all Inland Ponds and Lakes using TerraModeler functionality. Elevation values were assigned to all Inland streams and rivers using Photo Science proprietary software. All Class 2 LIDAR data inside of the collected breaklines were then classified to Class 9 using TerraScan macro functionality. The breakline files were then translated to ESRI Shapefile and ARC Generate format using ESRI conversion tools.
Breaklines were used to reclassify lakes, ponds, and inland drains. Data was then run through additional macros to ensure deliverable classification levels matching LAS ASPRS Classification structure. GeoCue functionality was then used to ensure correct LAS Version. In house software was used as a final QA/QC check to provide LAS Analysis of the delivered tiles. Buffered LAS files were created in GeoCue to provide overedge to the DEM creation. These tiles were then run through automated scripting within ArcMap and were combined with the Hydro Flattened Breaklines to create the 5' DEM. Final DEM tiles were clipped to the tile boundary in order to provide a seamless dataset.
A manual QA review of the tiles was completed in ArcMap to ensure full coverage with no gaps or slivers within the project area.

Source_Used_Citation_Abbreviation: LiDAR

Process_Date: 2010

Source_Produced_Citation_Abbreviation: LiDAR post-processed data

Source_Produced_Citation_Abbreviation: DEM

Source_Produced_Citation_Abbreviation: Hydro Flattening Break Lines

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Grid_Coordinate_System:

Grid_Coordinate_System_Name: State Plane Coordinate System 1983

State_Plane_Coordinate_System:

SPCS_Zone_Identifier: 2302

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.999950

Longitude_of_Central_Meridian: -90.333333

Latitude_of_Projection_Origin: 29.5

False_Easting: 2296583.333333

False_Northing: 0.0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 0.000328

Ordinate_Resolution: 0.000328

Planar_Distance_Units: survey feet

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983

Ellipsoid_Name: Geodetic Reference System 1980

Semi-major_Axis: 6378137.000000

Denominator_of_Flattening_Ratio: 298.257222

Entity_and_Attribute_Information:

Overview_Description:

Entity_and_Attribute_Overview:

LAS 1.2 files (ASPRS Classes (1,2,4,5,7,9,12); Breakline File Shapefiles; Breakline File ARC Generate; 1 Foot Contours; 10 Foot Contours; ASCII Last Pulse All Shots Ellipsoidal; ASCII Last Pulse All Shots Orthometric; ASCII Last Pulse BareEarth Orthometric; 5' BareEarth Raster DEM ; 5' First Pulse All Shots Raster DEM; 5' First Pulse All Shots ASCII; ESRI ARC/GIS TIN

Entity_and_Attribute_Detail_Citation:

All deliverables meet specifications in contract. LAS Files meet ASPRS Classification Standards.

Metadata_Reference_Information:

Metadata_Date: 20100802

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Photo Science, Inc.

Contact_Person: Mark Meade

Contact_Address:

Address_Type: mailing and physical address

Address: 2670 Wilhite Drive

City: Lexington

State_or_Province: KY

Postal_Code: 40503

Country: USA

Contact_Voice_Telephone: 859-277-8700

Contact_Electronic_Mail_Address: mmeade@photoscience.com

Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998