GEO_2013_LIDAR_LAS_PA07

Metadata:

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

Identification_Information:

Citation:

Citation_Information:

Originator: Tetra Tech

Publication_Date: 20140210

Title: GEO_2013_LIDAR_LAS_PA07

Geospatial_Data_Presentation_Form: Lidar point cloud

Description:

Abstract:

This point cloud dataset is part of the mapping and data analysis related to the proposed Susitna-Watana hydroelectric project. The Alaska Energy Authority (AEA) is preparing a License Application that will be submitted to the Federal Energy Regulatory Commission (FERC) for the Susitna-Watana Hydroelectric Project using the Integrated Licensing Process. The Project is located on the Susitna River, an approximately 300-mile-long river in the south-central region of Alaska. The Project’s dam site will be located at Project River Mile (PRM) 187.1. The results of this study will provide information that will inform the 2013–2014 formal study program, Exhibit E of a license application, and FERC’s National Environmental Policy Act analysis for the Project license. This delivery contains point cloud data in LAS 1.2 format for Priority Area 07, classified as follow: Class 1: Unclassified, Class 2: Ground, Class 3: Low vegetation, Class 4: Medium Vegetation, Class 5: High Vegetation, Class 7: Low points (noise), Class 8: Model key points, Class 9: Water . Derived products may be less accurate in areas of extreme terrain and dense vegetation due to a lesser number of points defining the ground in these areas. Classified data sets such as this one may have varying posting due to some pulses not reaching the ground.

Lidar_Information:

Lidar_Collection_Information:

Lidar_Specification: LAS 1.2

Lidar_Sensor: Optech Gemini

Lidar_Maximum_Returns: 4

Lidar_Pulse_Spacing: 0.23

Lidar_Density: 8 points per square meter

Lidar_Flight_Height: 800

Lidar_Flight_Speed: 130

Lidar_Scan_Angle: 17

Lidar_Scan_Frequency: 70

Lidar_Pulse_Rate: 70

Lidar_Pulse_Duration: unknown

Lidar_Pulse_Width: 0.2

Lidar_Central_Wavelength: 250

Lidar_Multiple_Pulses_In_Air: 1

Lidar_Beam_Divergence: 0.25

Lidar_Swath_Width: 118

Lidar_Swath_Overlap: 55

Lidar_Coordinate_Reference_System_Name: NAD_1983_StatePlane_Alaska_4_FIPS_5004_Feet

Lidar_Geoid: National Geodetic Survey (NGS) Geoid09

Lidar_Accuracy_Information:

Lidar_Calculated_Horizontal_Accuracy: No horizontal accuracy verifications have been completed

Lidar_Raw_Fundamental_Vertical_Accuracy: N/A

Lidar_Classified_Fundamental_Vertical_Accuracy: 16.13

Lidar_Classified_Consolidated_Vertical_Accuracy: N/A

Lidar_Supplemental_Vertical_Accuracy:

Lidar_Supplemental_Vertical_Accuracy_Type:

Results of the supplemental vertical accuracy tests to be supplied with final delivery.

Lidar_Supplemental_Vertical_Accuracy_Value:

Results of the supplemental vertical accuracy tests to be supplied with final delivery.

Lidar_LAS_Information:

Lidar_LAS_Version: 1.2

Lidar_LAS_Point_Record_Format: LAS

Lidar_LAS_Witheld_Point_Identifier: No points were withheld.

Lidar_LAS_Overage_Point_Identifier: No overage points were identified.

Lidar_LAS_Radiometric_Resolution: 12

Lidar_LAS_Classification:

Lidar_LAS_Class_Code: 1

Lidar_LAS_Class_Description: Unclassified

Lidar_LAS_Classification:

Lidar_LAS_Class_Code: 2

Lidar_LAS_Class_Description: Ground

Lidar_LAS_Classification:

Lidar_LAS_Class_Code: 3

Lidar_LAS_Class_Description: Low Vegetation

Lidar_LAS_Classification:

Lidar_LAS_Class_Code: 4

Lidar_LAS_Class_Description: Medium Vegetation

Lidar_LAS_Classification:

Lidar_LAS_Class_Code: 5

Lidar_LAS_Class_Description: High Vegetation

Lidar_LAS_Classification:

Lidar_LAS_Class_Code: 7

Lidar_LAS_Class_Description: Low Point

Lidar_LAS_Classification:

Lidar_LAS_Class_Code: 8

Lidar_LAS_Class_Description: Model Key-points

Lidar_LAS_Classification:

Lidar_LAS_Class_Code: 9

Lidar_LAS_Class_Description: Water

Purpose:

The purpose of this dataset was for creation of digital elevation models.

Supplemental_Information:

CONTRACTOR - Tetra Tech SUBCONTRACTOR - Keystone Aerial Surveys, Inc. Lidar data were acquired and calibrated by Keystone Aerial Surveys, Inc.

Time_Period_of_Content:

Currentness_Reference: ground condition

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20130913

Ending_Date: 20131107

Status:

Progress: Complete

Maintenance_and_Update_Frequency: No updated planned, but additional data to be collected.

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -150.260162

East_Bounding_Coordinate: -149.926071

North_Bounding_Coordinate: 62.482085

South_Bounding_Coordinate: 62.304931

Lidar_Bounding_Coordinates:

Left_Bounding_Coordinate: 1596404.578

Right_Bounding_Coordinate: 1652923.177

Top_Bounding_Coordinate: 3099234.619

Bottom_Bounding_Coordinate: 3034551.685

Keywords:

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: Susitna-Watana Hydroelectric Project

Theme_Keyword: Susitna River

Theme_Keyword: Elevation

Theme_Keyword: LiDAR

Theme_Keyword: Bare-Earth

Theme_Keyword: Topography

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: Susitna River

Place_Keyword: Alaska

Place_Keyword: Priority Area 07

Temporal:

Temporal_Keyword_Thesaurus: None

Temporal_Keyword: September

Temporal_Keyword: October

Temporal_Keyword: November

Temporal_Keyword: 2013

Access_Constraints: Unknown

Use_Constraints:

Data use to be limited to Susitna-Watana Hydroelectric Project use as determined by the Alaska Energy Authority.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Tetra Tech

Contact_Person: Bill Fullerton

Contact_Position: Point of Contact

Contact_Address:

Address_Type: mailing and physical

Address: 1420 5th Ave., Suite 550

City: Seattle

State_or_Province: WA

Postal_Code: 98101

Country: US

Contact_Voice_Telephone: 206.728.9655

Contact_Facsimile_Telephone: 206.728.9670

Contact_Electronic_Mail_Address: bill.fullerton@tetratech.com

Data_Set_Credit: Tetra Tech

Native_Data_Set_Environment:

MicroStation v8i, TerraScan v8i, 12-02-2012, Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.1.1.3143

Data_Quality_Information:

Logical_Consistency_Report:

These LAS files have been classified but contain all points collected. No points have been removed or excluded. Automatic qualitative assessments were performed to gauge data completeness. Automatic qualitative assessments were performed to gauge absolute vertical accuracy. Automatic and visual qualitative assessments were performed to gauge relative vertical accuracy. The software packages utilized to perform the assessments were Terrascan, LP360, and Lastools (the open-source and licensed as LGPL tools).

Completeness_Report:

LiDAR dataset contained flight-line offsets due to a combination of variable turbulence and high Positional Dilution of Precision (PDOP). During acquisition, there were 5 known times a day of approximately 30-45 minutes in which collection was not possible due to PDOP rising above 5.0 due to a lack of satellites. The acquisition subcontractor, Keystone Aerial Surveys, circled in air, or used these times to land for fuel. However there were times when the flight was on-line and would approaching waves of high PDOP during collection. Therefore, a variance in data quality with drifting quality of data is expected. Additional flight-line offsets were due to sudden winds. Mt. Denali is known for creating its own weather patterns, and Keystone Aerial Survey's pilots tried to adjust to sudden winds from the ridge in excess of 100 knots with very little warning. Flight lines offset between PRM 92 - 95, and PRM 97 - 98 were caused by pitching of the aircraft, quick movements of the nose, that in turn caused the LiDAR points to bunch up and look similar to artificial terraces. The flight-line offset issues do not affect the quality of the absolute vertical accuracy.

Positional_Accuracy:

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

Geovera, LCC completed a GPS survey of variously selected ground control points for LiDAR accuracy validation. A Final Control Report was computed in TerraScan as a quality assurance check. Vertical positional accuracy will be computed for the final deliverable. The Vertical_Positional_Accuracy_Value reported below (8.23 cm) is only for Priority Area 07 (PA-07).

Quantitative_Vertical_Positional_Accuracy_Assessment:

Vertical_Positional_Accuracy_Value: 8.23

Vertical_Positional_Accuracy_Explanation:

Ground check points were surveyed on the hardest and flatest surfaces available. Due to the remote location of the area of interest, hard, flat surfaces like roads were not always available. The relationship between surveyed and LiDAR points was analyzed in order to determine the elevation difference and root square mean error (RMSEz) for the data set. An automated tool in Terrascan was used to perform the analysis. Vertical positional accuracy will be computed for the final deliverable.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: Tetra Tech

Publication_Date: 20140210

Title: Lidar data for Priority Area 07, Susitna, Alaska

Geospatial_Data_Presentation_Form: Lidar point cloud

Publication_Information:

Publication_Place: Tetra Tech

Publisher: Tetra Tech

Other_Citation_Details: Not Applicable

Online_Linkage: None

Source_Scale_Denominator: 99999999

Type_of_Source_Media: 2.0 USB hard drive

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20140110

Ending_Date: 20140207

Source_Currentness_Reference: LAS files date modified

Source_Citation_Abbreviation: Not Applicable

Source_Contribution: Not Applicable

Process_Step:

Process_Description: Metadata created

Process_Date: 20140210

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Tetra Tech

Contact_Person: Bill Fullerton

Contact_Address:

Address_Type: mailing and physical

Address: 1420 5th Ave., Suite 550

City: Seattle

State_or_Province: WA

Postal_Code: 98101

Country: USA

Contact_Voice_Telephone: 206.728.9655

Contact_Facsimile_Telephone: 206.728.9670

Contact_Electronic_Mail_Address: bill.fullerton@tetratech.com

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Point

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: Point

Point_and_Vector_Object_Count: 3258969375

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: NAD 1983 StatePlane Alaska 4 FIPS 5004 Feet

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.9999

Longitude_of_Central_Meridian: -150.0

Latitude_of_Projection_Origin: 54.0

False_Easting: 1640416.666666667

False_Northing: 0.0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 0.000000007285705372339636

Ordinate_Resolution: 0.000000007285705372339636

Planar_Distance_Units: foot_us

Geodetic_Model:

Horizontal_Datum_Name: D North American 1983

Ellipsoid_Name: GRS 1980

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: foot_us

Altitude_Encoding_Method: Implicit coordinate

Distribution_Information:

Distributor:

Contact_Information:

Contact_Person_Primary:

Contact_Person: GIS Public Access Coordinator

Contact_Organization:

AK Department of Natural Resources - Information Resource Management Section

Contact_Position: GIS Public Access Coordinator

Contact_Address:

Address_Type: mailing and physical address

Address: 550 W. 7th Suite 706

City: Anchorage

State_or_Province: AK

Postal_Code: 99501

Country: USA

Contact_Voice_Telephone: 907 269 8833

Contact_Facsimile_Telephone: 907 269 8920

Contact_Electronic_Mail_Address: dnr.gispub@alaska.gov

Resource_Description: Downloadable Data

Distribution_Liability:

The State of Alaska makes no express or implied warranties (including warranties of merchantability and fitness) with respect to the character, function, or capabilities of the electronic services or products or their appropriateness for any users purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products, any failure thereof or otherwise, and in no event will the State of Alaska s liability to the requestor or anyone else exceed the fee paid for the electronic service or product.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: ArcGIS feature class

Format_Version_Number: ArcGIS v10.1 sp1

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

Server=dnratwsde1.dnr.state.ak.us; Service=5150; User=gis; Version=SDE.DEFAULT

Fees: None.

Metadata_Reference_Information:

Metadata_Date: 20140210

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Tetra Tech

Contact_Person: Bill Fullerton

Contact_Position: Point of Contact

Contact_Address:

Address_Type: mailing and physical

Address: 1420 5th Ave., Suite 550

City: Seattle

State_or_Province: WA

Postal_Code: 98101

Country: UNITED STATES

Contact_Voice_Telephone: 206.728.9655

Contact_Facsimile_Telephone: 206.728.9670

Contact_Electronic_Mail_Address: bill.fullerton@tetratech.com

Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time