LiDAR Raw Swath- Sussex and Warren Counties, New Jersey LiDAR Task Order G12PD00941

Metadata:

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

Identification_Information:

Citation:

Citation_Information:

Originator: AeroMetric, Inc.

Publication_Date: 20130121

Title:

LiDAR Raw Swath- Sussex and Warren Counties, New Jersey LiDAR Task Order G12PD00941

Geospatial_Data_Presentation_Form:

tabular digital data vector digital data
raster digital data

Publication_Information:

Publication_Place: Sheboygan, WI

Publisher: AeroMetric

Description:

Abstract:

This task order is for planning, acquisition, processing, and derivative products of LiDAR data collected in the vicinity of Sussex and Warren Counties in the state of New Jersey. LiDAR data, and derivative products produced in compliance with this task order are part of the data to be processed under Contract number G10PC00025, Order number G12PD00941. Specifications listed below are based on the U.S. Geological Survey National Geospatial Program Base LiDAR Specification, Version 13.

Purpose:

USGS has a requirement for derivative LiDAR products in Sussex and Warren counties and vicinity in New Jersey. The LiDAR data set was collected previously at a nominal pulse spacing (NPS) of 1.4 meters or less. The Sussex-Warren LiDAR processing project is to provide raw point cloud, classified points and bare-earth processed LiDAR data suitable for the project area. The project consisted of processing provided data, calibration, classification of LiDAR data, and creation of final deliverable products. Vertical accuracy was to achieve a RMSE Z of 12.5 cm (0.41 feet)or better in "open terrain" and Fundamental Vertical Accuracy (FVA) of 24.5 cm (0.80 ft) at 95% confidence level based on RSMEz x 1.960 in "open terrain" as defined by National Standards for Spatial Data Accuracy (NSSDA); assessed and reported using National Digital Elevation Program (NDEP)/ASPRS Guidelines. The accuracy of the LiDAR data as tested met or exceeded the vertical accuracy requirements, however, derived products may be less accurate in areas of dense vegetation due to a lesser number of points defining the bare-earth in such areas.

Supplemental_Information:

The LiDAR data set was collected by Kucera International then processed by Robinson Aerial Surveys, Inc under specification for The Federal Emergency Management Agency (FEMA). Metadata files pertinent to the origination of this dataset named, 34041C_Terrain_metadata.xml and 34027C_Terrain_metadata.xml, may accompany this metadata and derivative products and can provide information on the initial collection details.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 20090111

Currentness_Reference: ground condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -75.20

East_Bounding_Coordinate: -74.51

North_Bounding_Coordinate: 41.385

South_Bounding_Coordinate: 40.845

Keywords:

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: Light Detection and Ranging

Theme_Keyword: LiDAR

Theme_Keyword: Breaklines

Theme_Keyword: Survey Control

Theme_Keyword: DEM

Theme_Keyword: Lift

Theme_Keyword: LAS

Theme_Keyword: Swath

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: US

Place_Keyword: State

Place_Keyword: New Jersey

Place_Keyword: NJ

Place_Keyword: Sussex County

Place_Keyword: Warren County

Access_Constraints: None.

Use_Constraints:

None. However, users should be aware that changes may have occurred since this data set was collected in 2008 and that some parts of this data may no longer represent actual surface conditions. The LiDAR data also lacks discrete time stamps and the scan angle is equal to 0, this is because the original data was las v1.0 which did not store this information. Users of this data in critical applications should have a full awareness of its limitations.
Acknowledgment of the U.S. Geological Survey would be appreciated for products derived from these data.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Mike Duncan

Contact_Organization: United States Geological Survey

Contact_Position: National Geospatial Technical Operations Center

Contact_Address:

Address_Type: mailing

Address: 1400 Independence Road

City: Rolla

State_or_Province: MO

Postal_Code: 65401

Country: USA

Contact_Voice_Telephone: 573-308-3799

Contact_TDD/TTY_Telephone: unknown

Contact_Facsimile_Telephone: 573-308-3810

Contact_Electronic_Mail_Address: jduncan@usgs.gov

Hours_of_Service: unknown

Contact_Instructions: none

Data_Set_Credit: AeroMetric, Inc.

Native_Data_Set_Environment:

Processing Programs and versions - TerraSolid TerraScan (version 012.019), TerraModeler (version 012.008) and TerraMatch (version 012.010), Intergraph MicroStation (version 08.05.02.70), and GeoCue (version 2012.1.27.4).
Viewing Program - GlobalMapper V13.00

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

LiDAR data set for this area was collected by Kucera International in 2008 to meet FEMA LIDAR Specifications for Flood Hazard Mapping, Appendix 4B (The expected horizontal RMSE of the 1"=100' Class 1 standards is +/- 1.5'(per acquisition metadata). This data set was provided to Aerometric. Aerometric performed ground survey in the area to collect ground check points to be used in vertical accuracy assessment of the data set.

Logical_Consistency_Report: None

Completeness_Report: Complete

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Data was collected in 2008 to meet FEMA LIDAR Specifications for Flood Hazard Mapping, Appendix 4B. <http://www.fema.gov/plan/prevent/fhm/lidar_4b.shtm#4>. The measurements contained within the elevation of this feature class are compiled to meet the ASPRS Class 1 accuracy standards for 1"=100' maps.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

The vertical accuracy of the swath data has been tested to achieve a RSMEz of 12.5 cm (0.41 ft) or better in "open terrain". Also a Fundamental Vertical Accuracy (FVA) of 24.5 cm (0.80 ft) at 95% confidence level based on RSMEz x 1.960 in "open terrain" as defined by National Standards for Spatial Data Accuracy (NSSDA); assessed and reported using National Digital Elevation Program (NDEP)/ASPRS Guidelines.

The vertical accuracy assessment is conducted by comparing ground survey check point z values to raw swath LiDAR data z values by horizontal proximity. Differences in z values are calculated to express an RMSEz value.

Quantitative_Vertical_Positional_Accuracy_Assessment:

Vertical_Positional_Accuracy_Value: 15.6 cm (0.511 ft)

Vertical_Positional_Accuracy_Explanation:

Data tested 15.6 cm (0.511 ft) Fundamental Vertical Accuracy (FVA) at the 95% confidence level in open terrain as tested against a Triangulated Integrated Network (TIN) of swath data.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: Robinson Aerial Surveys, Inc

Publication_Date: 20090111

Title: DCS Terrain Submission for Warren_County, NJ

Edition: FEMA CASE 08-02-0998S

Geospatial_Data_Presentation_Form: tabular digital data

Type_of_Source_Media: disc

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 20090111

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation: Robinson Aerial

Source_Contribution:

Analyze LiDAR data set to provide terrain models and data representing the topography of the project area to specifications of FEMA Guidelines and Specifications, Appendix N.
Contracted to meet FEMA LIDAR Specifications for Flood Hazard Mapping, Appendix 4B. <http://www.fema.gov/plan/prevent/fhm/lidar_4b.shtm#4>. The measurements contained within the elevation of this feature class are compiled to meet the ASPRS Class 1 accuracy standards for 1"=100' maps.

Source_Information:

Source_Citation:

Citation_Information:

Originator: Kucera International

Publication_Date: 200804

Title: Airborne LiDAR Acquisition

Type_of_Source_Media: disc

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: Unknown

Ending_Date: Unknown

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: Kucera International

Source_Contribution:

Initial LiDAR collection was conducted by Kucera International in April 2008 with a Leica ALS50 airborne LiDAR system. Acquisition was made with a Nominal Point Spacing of 1.4 meters. Ground point classification was carried out using TerraScan software by Terrasolid Limited. In the filtering process raw data was classified as Ground or non-Ground, (Unclassified), and provided as LAS 1.0 data.

Process_Step:

Process_Description:

The LiDAR data set was provided to AeroMetric to process and produce the necessary derivatives.
Point Cloud Processing:
1. Horizontal Datum - North American Datum 1983 (NAD83)
2. Horizontal Coordinates - New Jersey State Plan - 2900 - feet.
3. Vertical Datum - North American Vertical Datum 1988 (NAVD88)
4. Geoid Model used to reduce satellite derived elevations to orthometric heights - NGS Geoid09.

LiDAR Processing:
1. Point Cloud data is imported to TerraScan in a Microstation V8 (V) CAD environment on a specified 5000 foot by 5000 foot tiling scheme.
2. Analyze the data for overall completeness and consistency. This is to ensure that there are no voids in the data.
3. Inspect for calibration errors in the dataset using the TerraMatch software. This is accomplished by sampling the data collected across all flight lines and classify the individual lines to ground class. The software will use the ground-classified lines to compute corrections (Heading, Pitch, Roll, and Scale).
4. Orientation corrections (i.e. Calibration corrections) are then applied (if needed) to the entire dataset.
5. Automatic ground classification is performed using algorithms with customized parameters to best fit the project area. Several areas of varying relief and planimetric features were inspected to verify the final ground surface.
6.AeroMetric, Inc. provided Quality Assurance and Quality Control (QA/QC) data for this project. AeroMetric captured QA/QC points in 'open terrain' land cover category that were used to test the accuracy of the LiDAR ground surface. TerraScan's Output Control Report (OCR) was used to compare the QA/QC data to the LiDAR data. This routine searches the LiDAR dataset by X and Y coordinate, finds the closest LiDAR point and compares the vertical (Z) values to the known data collected in the field. Based on the QA/QC data, a bias adjustment was determined, and the results were applied (if necessary) to the LiDAR data.
7. After the LiDAR data is finalized for vertical placement, a macro is run via TerraScan to output a dataset generated on a per swath basis as part of the final deliverables. All points of the swath are reclassified to class 0 during this step.

Process_Date: 201210

Cloud_Cover: Unknown

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Point

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: 2900

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.9999

Longitude_of_Central_Meridian: -74.5

Latitude_of_Projection_Origin: 38.83333

False_Easting: 492125.0

False_Northing: 0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 0.01

Ordinate_Resolution: 0.01

Planar_Distance_Units: Survey Feet

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983

Ellipsoid_Name: Geoid 09

Semi-major_Axis: 6378137

Denominator_of_Flattening_Ratio: 298.257222101

Vertical_Coordinate_System_Definition:

Altitude_System_Definition:

Altitude_Datum_Name: North American Vertical Datum of 1988

Altitude_Resolution: 0.01

Altitude_Distance_Units: Survey Feet

Altitude_Encoding_Method:

Explicit elevation coordinate included with horizontal coordinates

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: Point Cloud

Entity_Type_Definition: Points describing measured echo from ground surface

Entity_Type_Definition_Source: LAS 1.2

Detailed_Description:

Entity_Type:

Entity_Type_Label: Object ID

Entity_Type_Definition: Internal feature number

Entity_Type_Definition_Source: ERSI

Detailed_Description:

Entity_Type:

Entity_Type_Label: Shape

Entity_Type_Definition: Feature geometry

Entity_Type_Definition_Source: ESRI

Overview_Description:

Entity_and_Attribute_Overview:

LiDAR data provides spatial representation of terrain features in horizontal and vertical dimensions relative to surrounding features and may be geo-referenced.

Entity_and_Attribute_Detail_Citation: LiDAR data

Metadata_Reference_Information:

Metadata_Date: 20130118

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: AeroMetric, Inc.

Contact_Address:

Address_Type: Mailing and physical address

Address: 4020 Technology Parkway

City: Sheboygan

State_or_Province: WI

Postal_Code: 53083-6049

Country: US

Contact_Voice_Telephone: 1-920-457-3631

Contact_Facsimile_Telephone: 1-920-457-0410

Contact_Electronic_Mail_Address: cguy@aerometric.com

Hours_of_Service: Monday through Friday 8:00 AM to 5:00 PM (Central Time)

Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998