2004 Maine Coastline LiDAR

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_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), Coastal Services Center (CSC)

Publication_Date: 20061019

Title: 2004 Maine Coastline LiDAR

Edition: 1st Edition

Publication_Information:

Publication_Place: Charleston, SC

Publisher: NOAA's Ocean Service, Coastal Services Center (CSC)

Online_Linkage:

<http://www.csc.noaa.gov/dataviewer/index.html?action=advsearch&qType=in&qFld=ID&qVal=17>

Online_Linkage: <http://www.csc.noaa.gov/lidar>

Online_Linkage: <http://www.csc.noaa.gov>

Online_Linkage: <http://www.csc.noaa.gov/htdata/lidar1_z/geoid12a/data/17>

Description:

Abstract:

This metadata document describes the collection and processing of Light Detection and Ranging (LIDAR) data over an area along the coast of Maine. Data was collected at a nominal two (2) meter post spacing between points. Two elevation data sets were compiled in this project, first surface returns, in which features that are above the ground, such as buildings, bridges, tree tops, etc. have not been eliminated and a Bare Earth Data set.

Purpose:

This LIDAR has been supplied to the NOAA, Coastal Services Center (CSC) to support local Coastal Zone Managers in their decision-making processes.

Supplemental_Information:

The 2004 Southern Maine Lidar Data Validation Report may be viewed at: <ftp://ftp.csc.noaa.gov/pub/crs/beachmap/qa_docs/me>

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20040505

Ending_Date: 20040506

Currentness_Reference: Ground Condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -70.692195

East_Bounding_Coordinate: -69.716843

North_Bounding_Coordinate: 43.800050

South_Bounding_Coordinate: 43.065356

Keywords:

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category

Theme_Keyword: elevation

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: Bathymetry/Topography

Theme_Keyword: Elevation

Theme_Keyword: Lidar

Theme_Keyword: Laser

Theme_Keyword: Beach

Theme_Keyword: Digital elevation model

Theme_Keyword: DEM

Theme_Keyword: Erosion

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: United States

Place_Keyword: Maine

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.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: NOAA Coastal Services Center

Contact_Address:

Address_Type: mailing and physical

Address: 2234 South Hobson Ave.

City: Charleston

State_or_Province: SC

Postal_Code: 29405-2413

Country: US

Contact_Voice_Telephone: 843-740-1200

Contact_Electronic_Mail_Address: csc.info@noaa.gov

Data_Set_Credit:

EarthData International of Maryland, LLC 7320 Executive Way Frederick, MD 21704 1-301-948-8550 1-301-963-2064

Data_Quality_Information:

Logical_Consistency_Report:

The data were evaluated to ensure no voids exist and the data covers the entire project area.

Completeness_Report: None available.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

The horizontal accuracy of this lidar data was not assessed. The high vertical accuracy is indicative of good horizontal accuracy, though slight horizontal inaccuracies are difficult to detect using these check points because they were located in relatively flat terrain.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

Thirty check points collected on generally flat open terrain were compared to the lidar points. The Guidelines for Digital Elevation Data by NDEP recommends interpolation from a surface generated from a triangulated irregular network (TIN) derived from the lidar point data surrounding the check point for assessing the accuracy of mass points. This method was employed in this evaluation. Elevation values at the location of each of the 30 check points were interpolated from the triangulated bare earth point data. The vertical error at each check point location was calculated by subtracting the interpolated lidar elevation value from the check point elevation value.

Quantitative_Vertical_Positional_Accuracy_Assessment:

Vertical_Positional_Accuracy_Value: 0.20

Vertical_Positional_Accuracy_Explanation:

Tested 0.20 meter fundamental vertical accuracy at 95 percentile confidence level in open terrain using RMSE x 1.96.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: Terrasurv, Inc

Publication_Date: 20040912

Publication_Time: Unknown

Title: Ground Control Survey of Coastal Maine

Edition: 1st

Geospatial_Data_Presentation_Form: Model

Publication_Information:

Publication_Place: Frederick, MD

Publisher: EarthData International of Maryland

Type_of_Source_Media: Electronic mail system

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20040616

Ending_Date: 20040618

Source_Currentness_Reference: Ground Condition

Source_Citation_Abbreviation: GPS Ground Control

Source_Contribution:

Ten (10) ground control points were established by Terrasurv, Inc. using GPS for vertical and horizontal coordinate values. Ground control references NAD83, NAVD88, Geoid99, in meters. An additional thirty (30) independent check ground control points were acquired by Terrasurv, Inc. and provided directly to NOAA, CSC to support an independent analysis of the accuracy of the Lidar data.

Source_Information:

Source_Citation:

Citation_Information:

Originator: EarthData Aviation

Publication_Date: 20040912

Publication_Time: Unknown

Title: Coastal Maine LIDAR Scanning Project

Geospatial_Data_Presentation_Form: Model

Publication_Information:

Publication_Place: Hagerstown, MD

Publisher: EarthData Aviation

Type_of_Source_Media: CD-ROM

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20040505

Ending_Date: 20040506

Source_Currentness_Reference: Ground Condition

Source_Citation_Abbreviation: EarthData Aviation

Source_Contribution:

The project area was flown using EarthData Aviation's Piper Navajo aircraft with tail number 62912. LIDAR data was captured using an ALS40 LIDAR system, including an inertial measuring unit (IMU) and a dual frequency GPS receiver. The acquisition was flown during the period of May 5, 2004 through May 6 2004. One ground based GPS receiver was in constant operation during each flight. During the data acquisition, all receivers collected phase data at an epoch rate of 1 Hz. All GPS phase data was post processed with continuous kinematic survey techniques using "On the Fly" (OTF) integer ambiguity resolution. The GPS data was processed with forward and reverse processing algorithms. The results from each process, using the data collected at the airport, were combined to yield a single fixed integer phase differential solution of the aircraft trajectory.

Process_Step:

Process_Description:

EarthData has developed a unique method for processing LIDAR data. The algorithms for filtering data were utilized within EarthData's proprietary software and commercial software written by TerraSolid. This software suite of tools provides efficient processing for small to large-scale projects and has been incorporated into ISO 9001 compliant production work flows. POINT CLOUD The following is a step-by-step breakdown of the process utilized to produce the variably-spaced point cloud surface data set. 1. Processing of the LIDAR data begins with refinement of the initial boresight alignment parameters provided by EarthData Aviation in the LITES configuration file delivered with the raw data. The technician also verifies that there are no voids, and that the data covers the entire project area. Calibration is accomplished using the tri-directional flight lines over the project airport, which is generally flat and free of major obstructions, trees or brush. Two overlapping bi-directional lines are flown along the length of the runway, and the cross flight line is perpendicular to both. All three lines are examined to ensure that they agree, within expected system tolerances, in the overlapping areas. The technician will review flight lines and locate the areas that contained systematic errors or distortions that were introduced by the LIDAR sensor. 2. Systematic distortions highlighted in step 1 were removed and the data was re-inspected. Corrections and adjustments can involve the application of angular deflection or compensation for curvature of the ground surface that can be introduced by crossing from on type of land cover to another. 3. All flight lines are processed with the refined calibration parameters obtained thru steps 1 and 2. All flight line are examined to ensure that they agree, within expected system tolerances, in the overlapping areas (side lap). 4. The LIDAR data for each flight line was trimmed in batch for the removal of the overlap areas between flight lines. The data was checked against a control network to ensure that vertical requirements were maintained. Conversion to the client-specified datum and projections were then completed. The LIDAR flight line data sets were then segmented into adjoining tiles for batch processing and data management. 5. The data was then edited for Blunder removal. 6. The data was processed interactively by the operator using LIDAR editing tools. During this final phase the operator generated a TIN based on a desired thematic layer to evaluate the automated classification performed in step 5. This allowed the operator to quickly re-classify points from one layer to another and recreate the TIN surface to see the effects of edits. The use of geo-referenced images was toggled on or off to aid the operator in identifying problem areas. The data was also examined with an automated profiling tool to aid the operator in the reclassification. 7. Orthometric heights were converted using the Geoid 03 undulation model. 8. The data was separated into (1) variably-spaced point cloud in LAS files. The files were written to PC readable CD-ROM.

Source_Used_Citation_Abbreviation: EarthData International

Process_Date: 20040912

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: EarthData International of Maryland

Contact_Address:

Address_Type: mailing and physical

Address: 7320 Executive Way

City: Frederick

State_or_Province: Maryland

Postal_Code: 21704

Country: USA

Contact_Voice_Telephone: 1-301-948-8550

Contact_Facsimile_Telephone: 1-301-963-2064

Contact_Electronic_Mail_Address: metadata@earthdata.com

Hours_of_Service: 9 AM - 5 PM Mon. - Fri.

Process_Step:

Process_Description:

The NOAA Coastal Services Center (CSC) received files in LAS format. The files contained lidar intensity and elevation measurements. CSC performed the following processing on the data to make it available within the Lidar Data Retrieval Tool (LDART): 1. The data were projected from UTM to geographic decimal degrees using the General Cartographic Transformation Package. 2. The las files were sorted by latitude and the las header fields were completed.

Process_Date: 20050105

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: NOAA Coastal Services Center

Contact_Address:

Address_Type: mailing and physical

Address: 2234 South Hobson Ave.

City: Charleston

State_or_Province: SC

Postal_Code: 29405-2413

Country: US

Contact_Voice_Telephone: 843-740-1200

Contact_Electronic_Mail_Address: csc.info@noaa.gov

Process_Step:

Process_Description:

For data management purposes, the Coastal Services Center converted the data from NAVD88 elevations to ellipsoid elevations using Geoid 03.

Process_Date: 200801

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: NOAA Coastal Services Center

Contact_Address:

Address_Type: mailing and physical

Address: 2234 South Hobson Ave.

City: Charleston

State_or_Province: SC

Postal_Code: 29405-2413

Country: US

Contact_Voice_Telephone: 843-740-1200

Contact_Electronic_Mail_Address: csc.info@noaa.gov

Cloud_Cover: 0

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Point

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: Point

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 9.5886398249877e-10

Longitude_Resolution: 6.99404049545068e-10

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

Denominator_of_Flattening_Ratio: 298.257

Vertical_Coordinate_System_Definition:

Altitude_System_Definition:

Altitude_Datum_Name: Ellipsoid

Altitude_Resolution: 0.01

Altitude_Distance_Units: Meters

Altitude_Encoding_Method:

Explicit elevation coordinate included with horizontal coordinates

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: NOAA Coastal Services Center

Contact_Address:

Address_Type: mailing and physical

Address: 2234 South Hobson Ave.

City: Charleston

State_or_Province: SC

Postal_Code: 29405-2413

Country: US

Contact_Voice_Telephone: 843-740-1200

Contact_Electronic_Mail_Address: csc.info@noaa.gov

Resource_Description: Downloadable Data

Distribution_Liability:

Any conclusions drawn from analysis of this information are not the responsibility of NOAA, the Coastal Services Center or its partners.

Custom_Order_Process:

This data can be obtained on-line at the following URL: <http://www.csc.noaa.gov/ldart>

Metadata_Reference_Information:

Metadata_Date: 20050124

Metadata_Review_Date: 20080221

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: NOAA Coastal Services Center

Contact_Address:

Address_Type: mailing and physical

Address: 2234 South Hobson Ave.

City: Charleston

State_or_Province: SC

Postal_Code: 29405-2413

Country: US

Contact_Voice_Telephone: 843-740-1200

Contact_Electronic_Mail_Address: csc.info@noaa.gov

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998