Identification_Information: Citation: Citation_Information: Originator: Hubbard, T.D. Originator: Koehler, R.D. Originator: Combellick, R.A. Publication_Date: 2011 Title: High-resolution lidar data for Alaska infrastructure corridors Geospatial_Data_Presentation_Form: vector digital data, document Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2011-3 Publication_Information: Publication_Place: Fairbanks, AK, USA Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 291 p. Online_Linkage: http://dx.doi.org/10.14509/22722 Description: Abstract: In advance of design, permitting, and construction of a pipeline to deliver North Slope natural gas to out-of-state customers and Alaska communities, the Division of Geological & Geophysical Surveys (DGGS) has acquired lidar (Light Detection and Ranging) data along proposed pipeline routes, nearby areas of infrastructure, and regions where significant geologic hazards have been identified. Lidar data will serve multiple purposes, but have primarily been collected to (1) evaluate active faulting, slope instability, thaw settlement, erosion, and other engineering constraints along proposed pipeline routes, and (2) provide a base layer for the state-federal GIS database that will be used to evaluate permit applications and construction plans. This shapefile contains kinematicly-corrected trajectory data presented as a 1Hz sampling of the original 200 Hz Smooth-Best estimate Trajectory files (SBET). Purpose: Provide aircraft position and attitude during acquisition of lidar data. Supplemental_Information: This metadata file has been written to document and describe the SBET data generated for this project. Information about accuracy and quality of lidar data can be found in quality control reports provided by DOGAMI and delivery reports provided by Watershed Sciences, Inc. Individual reports were provided for each delivery set and have been combined by DGGS into comprehensive quality control and delivery reports. These documents are organized according to how data were delivered to DGGS. A description of information pertaining to the downloadable files can be found in the quality control and delivery reports. The DGGS metadata standard extends the FGDC standard to also include several elements that are required to facilitate our internal data management. These elements, referred to as "layers," group and describe files that have intrinsic logical or topological relationships. This dataset describes a single layer titled: >sbet: Smoothed Best Estimate Trajectory shapefile Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 2010 Ending_Date: 2011 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: As needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -150.82 East_Bounding_Coordinate: -141.00 North_Bounding_Coordinate: 70.38 South_Bounding_Coordinate: 61.04 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Theme_Keyword: Alaska Pipeline Theme_Keyword: Gasline Theme_Keyword: Geomorphology Theme_Keyword: Lidar Theme_Keyword: Proposed Natural Gas Pipeline Theme_Keyword: Smoothed Best Estimate Of Trajectory (SBET) Place: Place_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Place_Keyword: Alaska Highway Corridor Place_Keyword: Alaska, State of Place_Keyword: Trans-Alaska Pipeline Access_Constraints: This dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys Use_Constraints: Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's 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 or any failure thereof or otherwise. 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. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Alaska Division of Geological & Geophysical Surveys Contact_Person: James Weakland Contact_Position: GIS Analyst Contact_Address: Address_Type: mailing and physical Address: 3354 College Road City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Country: USA Contact_Voice_Telephone: (907)451-5029 Contact_Voice_Telephone: (907)451-5020 Contact_Electronic_Mail_Address: dggsgis@alaska.gov Data_Set_Credit: Data collection was supported by funding from the Department of Natural Resources (DNR), Division of Geological & Geophysical Surveys (DGGS), the Alaska Gas Pipeline Project Office, the Office of the Federal Coordinator, and the Alaska Gasline Development Corporation (AGDC). Lidar data were collected and processed by Watershed Sciences, Inc. of Corvallis, OR. Survey data were collected by McClintock Land Associates of Eagle River, AK. Lidar data and derivative products were checked for quality, completeness, and accuracy by State of Oregon Department of Geology & Mineral Industries based in Portland, OR. Native_Data_Set_Environment: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.3000 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Lidar survey datasets were referenced to the 1 Hz static ground GPS data collected over pre-surveyed monuments with known coordinates. While surveying, the aircraft collected 2 Hz kinematic GPS data, and the on-board inertial measurement unit (IMU) collected 200 Hz aircraft attitude data. Waypoint GPS v.8.10 was used to process the kinematic corrections for the aircraft. The static and kinematic GPS data were then post-processed after the survey to obtain an accurate GPS solution and aircraft positions. IPAS v.1.35 was used to develop a trajectory file that includes corrected aircraft position and attitude information. The trajectory data for the entire flight survey session were incorporated into a final smoothed best estimated trajectory (SBET) file that contains accurate and continuous aircraft positions and attitudes. Logical_Consistency_Report: Consistency refers to lidar elevation differences between overlapping flight lines. Consistency errors are created by poor lidar system calibration settings associated with sensor platform mounting. Errors in consistency manifest as vertical offsets between individual flight lines. Consistency offsets were measured using the "Find Match" tool within the TerraMatch© software toolset. This tool uses aircraft trajectory information linked to the lidar point cloud data to quantify flight line-to-flight line offsets. Completeness_Report: Lidar data have been checked for accuracy and completeness. Please refer to the lidar delivery report and lidar QC report for details about data accuracy completeness for individual delivery sets. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The positional coordinates and attitude of the aircraft were recorded continuously throughout the lidar collection mission. Aircraft position was measured twice per second (2 Hz) by an on-board differential GPS unit during periods with PDOP less than or equal to 3 and with at least 6 satellites in view. Aircraft position was measured twice per second (200 Hz) as pitch, roll and yaw (heading) from an on-board inertial measurement unit (IMU). To allow for post-processing correction and calibration, aircraft/sensor position and attitude are indexed by GPS time. During the lidar survey, static (1 Hz recording frequency) ground surveys were conducted over the survey control monuments. All control monuments were observed for a minimum of two survey sessions lasting no fewer than 4 hours. At the beginning of every session, the tripod and antenna were reset. Indexed by time, GPS data were used to correct the continuous on-board measurements of aircraft position recorded throughout the mission. Control monuments were located within 13 nautical miles of the survey area. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: The positional coordinates and attitude of the aircraft were recorded continuously throughout the lidar collection mission. Aircraft position was measured twice per second (2 Hz) by an on-board differential GPS unit during periods with PDOP less than or equal to 3 and with at least 6 satellites in view. Aircraft position was measured twice per second (200 Hz) as pitch, roll and yaw (heading) from an on-board inertial measurement unit (IMU). To allow for post-processing correction and calibration, aircraft/sensor position and attitude are indexed by GPS time. During the lidar survey, static (1 Hz recording frequency) ground surveys were conducted over the survey control monuments. All control monuments were observed for a minimum of two survey sessions lasting no fewer than 4 hours. At the beginning of every session, the tripod and antenna were reset. Indexed by time, GPS data were used to correct the continuous on-board measurements of aircraft position recorded throughout the mission. Control monuments were located within 13 nautical miles of the survey area. Lineage: Process_Step: Process_Description: Acquisition: The lidar data were collected between September and October 2010 and between May and July 2011.The survey used the Leica ALS60 system. Ground-level GPS and aircraft IMU were collected during the flight. The following settings were used: Survey altitude (AGL) = 900 meters, Mirror scan rate = 55 Hz, Pulse rate = 105 kHz, Single pulse mode, Field of view (FOV) = 28 degree (+/- 8 degrees from nadir), 60% side lap (>100% overlap), Laser swath width = 448 meters, Airspeed = 105 knots per hour, Footprint = 24 cm. On each collection date, there was no cloud cover below 5000 feet and no precipitation. Flight-line specifics are provided in the attribute tables of the SBET shapefiles. Ancillary equipment includes: Trimble R7 receivers, Trimble R8 receivers, Trimble HPB450 radios, and Trimble TSC2 controllers. Process_Date: 2010, 2011 Process_Step: Process_Description: All SBET shapefiles for each delivery were combined into a single shapefile containing all of the SBET data. Data were reprojected in Alaska Albers Equal Area Conic. Process_Date: 2012 Process_Step: Process_Description: A metadata file was created to generally describe data acquisition of lidar and also to describe the smooth best estimated trajectory (SBETS) files. Process_Date: 2012 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: point Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Map_Projection: Map_Projection_Name: Alaska Albers Equal Area Conic Albers_Conical_Equal_Area: Standard_Parallel: 55 Standard_Parallel: 65 Longitude_of_Central_Meridian: -154 Latitude_of_Projection_Origin: 50 False_Easting: 0 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.000001 Ordinate_Resolution: 0.000001 Planar_Distance_Units: meters Planar_Coordinate_Layer_Name: sbet Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 Ellipsoid_Name: Geodetic Reference System 80 Semi-major_Axis: 6378137 Denominator_of_Flattening_Ratio: 298.257222 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: sbet Entity_Type_Label: rdf2011-3-sbet Entity_Type_Definition: Kinematicly-corrected trajectory data presented as a 1Hz sampling of the original 200 Hz Smooth-Best estimate Trajectory files (SBET). Entity_Type_Definition_Source: this report Attribute: Attribute_Label: GPS_Time Attribute_Definition: GPS_Time (s) of data collection Attribute_Definition_Source: Watershed Sciences, Inc. Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 56.50408 Range_Domain_Maximum: 604792.57899 Attribute: Attribute_Label: Height Attribute_Definition: Height (m) of plane during data collection: NAVD88 Geoid 09 Attribute_Definition_Source: Watershed Sciences, Inc. Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 18.837 Range_Domain_Maximum: 5159.32 Attribute: Attribute_Label: Roll Attribute_Definition: Roll (deg) of the plane during data collection Attribute_Definition_Source: Watershed Sciences, Inc. Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -41.478219 Range_Domain_Maximum: 38.613914 Attribute: Attribute_Label: Pitch Attribute_Definition: Pitch (deg) of the plane during data collection Attribute_Definition_Source: Watershed Sciences, Inc. Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -33.227986 Range_Domain_Maximum: 22.134247 Attribute: Attribute_Label: Heading Attribute_Definition: Heading (deg) of the plane during data collection Attribute_Definition_Source: Watershed Sciences, Inc. Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -179.999985 Range_Domain_Maximum: 179.999816 Attribute: Attribute_Label: E_vel Attribute_Definition: Easting velocity (m/s) of the plane during data collection Attribute_Definition_Source: Watershed Sciences, Inc. Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -97.92675781 Range_Domain_Maximum: 94.57273102 Attribute: Attribute_Label: N_vel Attribute_Definition: Northing velocity (m/s) of the plane during data collection Attribute_Definition_Source: Watershed Sciences, Inc. Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -91.3674469 Range_Domain_Maximum: 111.9095993 Attribute: Attribute_Label: H_vel Attribute_Definition: Height velocity (m/s) of the plane during data collection Attribute_Definition_Source: Watershed Sciences, Inc. Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -20.27645302 Range_Domain_Maximum: 23.23749542 Attribute: Attribute_Label: Std_E Attribute_Definition: Standard deviation around Easting (m) of the plane during data collection Attribute_Definition_Source: Watershed Sciences, Inc. Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.003 Range_Domain_Maximum: 0.036 Attribute: Attribute_Label: Std_N Attribute_Definition: Standard deviation around Northing (m) of the plane during data collection Attribute_Definition_Source: Watershed Sciences, Inc. Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.003 Range_Domain_Maximum: 0.032 Attribute: Attribute_Label: Std_H Attribute_Definition: Standard deviation around Height (m) of the plane during data collection Attribute_Definition_Source: Watershed Sciences, Inc. Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.005 Range_Domain_Maximum: 0.047 Attribute: Attribute_Label: Std_Roll Attribute_Definition: Standard deviation around Roll (arcSec) of the plane during data collection Attribute_Definition_Source: Watershed Sciences, Inc. Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 2.2 Range_Domain_Maximum: 17.8 Attribute: Attribute_Label: Std_Pitch Attribute_Definition: Standard deviation around Pitch (arcSec) of the plane during data collection Attribute_Definition_Source: Watershed Sciences, Inc. Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 2.2 Range_Domain_Maximum: 20.1 Attribute: Attribute_Label: Std_Head Attribute_Definition: Standard deviation around Heading (arcSec) of the plane during data collection Attribute_Definition_Source: Watershed Sciences, Inc. Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 3.5 Range_Domain_Maximum: 158.8 Attribute: Attribute_Label: Std_E_vel Attribute_Definition: Standard deviation around Easting velocity (m/s) of the plane during data collection Attribute_Definition_Source: Watershed Sciences, Inc. Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.001 Range_Domain_Maximum: 0.006 Attribute: Attribute_Label: Std_N_vel Attribute_Definition: Standard deviation around Northing Velocity (m/s) of the plane during data collection Attribute_Definition_Source: Watershed Sciences, Inc. Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.001 Range_Domain_Maximum: 0.008 Attribute: Attribute_Label: Std_H_vel Attribute_Definition: Standard deviation around Height Velocity (m/s) of the plane during data collection Attribute_Definition_Source: Watershed Sciences, Inc. Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.001 Range_Domain_Maximum: 0.006 Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: Alaska Division of Geological & Geophysical Surveys Contact_Address: Address_Type: mailing and physical Address: 3354 College Road City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Country: USA Contact_Voice_Telephone: (907)451-5020 Contact_Facsimile_Telephone: (907)451-5050 Contact_Electronic_Mail_Address: dggspubs@alaska.gov Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays Contact_Instructions: Please view our website (http://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible. Resource_Description: RDF 2011-3 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 user's 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: Non-digital_Form: Current publication is not available on paper. To purchase other printed reports and maps, contact DGGS by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: Cash, check, money order, VISA, or MasterCard. Fees: Contact DGGS for current pricing Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: vector digital data Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://dx.doi.org/10.14509/22722 Fees: Free download Metadata_Reference_Information: Metadata_Date: 20120725 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Metadata manager Contact_Address: Address_Type: mailing and physical Address: 3354 College Road City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Country: USA Contact_Voice_Telephone: (907)451-5020 Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Use_Constraints: If the user has modified the data in any way they are obligated to describe the types of modifications they have performed in the supporting metadata file. User specifically agrees not to imply that changes they made were approved by the Alaska Department of Natural Resources or Division of Geological & Geophysical Surveys. Metadata_Extensions: Online_Linkage: http://www.dggs.alaska.gov/metadata/dggs.ext Profile_Name: dggs metadata extensions