Hubbard, T.D. Koehler, R.D. Combellick, R.A. 2011 vector digital data, document Raw Data File RDF 2011-3 Fairbanks, AK USA State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys http://www.dggs.alaska.gov/pubs/id/22722 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 dataset is the real-time kinematic (RTK) data collected during lidar data acquisition. Data were used to check the accuracy of collected lidar data. Provide real time kinematic (RTK) check points for data accuracy. This metadata file has been written to document and describe, as a whole, all of the RTK data collected as a part of this project. Specific information about accuracy and quality of RTK data can be found in delivery reports provided by Watershed Sciences, Inc. Individual reports were provided for each delivery set and have been combined by DGGS into a comprehensive delivery report. The delivery report document is organized according to how data were delivered to DGGS. A description of information pertaining to downloadable files can be found in the 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 relate individual data items to a common dataset. This dataset describes a single layer titled: >rtk: Real time kinematic (RTK) check points for data accuracy 2010 2011 ground condition Complete As needed -150.82 -141.00 70.38 61.04 ISO 19115 Topic Category geoscientificInformation Alaska Division of Geological & Geophysical Surveys Alaska Pipeline Gasline Geomorphology Lidar Proposed Natural Gas Pipeline Real Time Kinematic (RTK) Alaska Division of Geological & Geophysical Surveys Alaska Highway Corridor Alaska, State of Trans-Alaska Pipeline This dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below). 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. Alaska Division of Geological & Geophysical Surveys James Weakland GIS Analyst mailing and physical

3354 College Rd

Fairbanks AK 99709-3707 USA 907-451-5029 907-451-5020 dggsgis@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays 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. Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.3000 RTK data were collected during periods when Point Dilution of Precision (PDOP) was less than or equal to 3, and with at least 6 satellites in view of both a stationary reference receiver and the roving receiver. The surveyor begins collecting data after remaining stationary for 5 seconds, then calculating the pseudo range position from at least 3 epochs with the relative error under 1.5 cm horizontal and 2 cm vertical. RTK measurements were not taken on highly reflective surfaces and were taken no closer than one meter to any nearby terrain breaks. Static GPS data from the reference receiver were processed using triangulation with Continuously Operating Reference Stations (CORS). Please refer to the lidar delivery report for details about the survey accuracy for individual datasets. RTK GPS surveying involves using a GPS base station deployed over a known monument with a radio connection to a GPS rover. Both the base station and rover receive differential GPS data and a baseline correction is resolved between the two. RTK data have been checked for accuracy and completeness. Please refer to the lidar delivery report and lidar QC report for details about data completeness for individual delivery sets. The RTK data is accurate to 1.5 cm or less. The RTK data is accurate to 2 cm or less. A Trimble GPS receiver model R7 with Zephyr Geodetic antenna and ground plan was deployed for all static control. Simultaneously, RTK data were collected using a Trimble model R8 GNSS unit. The surveyor begins collecting data after remaining stationary for 5 seconds, then calculating the pseudo range position from at least three epochs with the relative error under 1.5 cm horizontal and 2 cm vertical. All GPS measurements were made with dual frequency L1-L2 receivers with carrier-phase correction. RTK positions were collected on bare earth locations such as paved, gravel or stable dirt roads, and other locations where the ground was clearly visible (and likely to remain visible) from the sky during the data acquisition and RTK measurement period(s). In order to facilitate comparisons with lidar measurements, RTK measurements were not taken on highly reflective surfaces such as center line stripes or lane markings on roads. RTK points were taken no closer than one meter to any nearby terrain breaks such as road edges or drop offs. 2010, 2011 Collected RTK data was post processed along with reference data and CORS data. Refer to the delivery report for more information about the RTK survey collection and data processing techniques. Final survey RTK data for each delivery were output to a point shapefile. 2010, 2011, 2012 All RTK shapefiles for each delivery were combined into a single shapefile containing all of the RTK data. Data were reprojected in Alaska Albers Equal Area Conic. 2012 A metadata file was created to generally describe the acquisition of RTK files for the entire project. 2012 point Alaska Albers Equal Area Conic 55 65 -154 50 0 0 coordinate pair 0.000001 0.000001 meters rtk North American Datum of 1983 Geodetic Reference System 80 6378137 298.257222 North American Vertical Datum of 1988 0.0000001 meters Attribute values rtk rdf2011-3-rtk Points showing location of RTK data acquisition sites. Alaska Division of Geological & Geophysical Surveys, this report Elevation Indicates elevation in meters. Department of Natural Resources, Division of Geological & Geophysical Surveys 0 1447.585 State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys mailing and physical

3354 College Road

Fairbanks AK 99709-3707 USA 907-451-5020 907-451-5050 dggspubs@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays 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. RDF 2011-3 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. 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. contact DGGS for current pricing SHP http://www.dggs.alaska.gov/pubs/id/22722 Free download DGGS publications are available as free online downloads or you may purchase paper hard-copies or digital files on CD/DVD or other digital storage media over the counter, by mail, phone, fax, or email from the DGGS Fairbanks office. Turnaround time is 1-2 weeks unless special arrangements are made and an express fee is paid. Shipping charge will be the actual cost of postage and will be added to the total amount due. Contact us for exact shipping amount. 20120529 Metadata manager mailing and physical

State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys

Fairbanks AK 99709-3707 USA 907-451-5020 FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998 If the user has modified this metadata file in any way, the user is obligated to describe the types of modifications the user has made. User specifically agrees not to misrepresent this metadata file, 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. http://www.dggs.alaska.gov/metadata/dggs.ext dggs metadata extensions