Dataset Name

Tonsina geophysical survey

Bibliographic Reference

Emond, A.M., CGG, Burns, L.E., Graham, G.R.C., and CGG Land (US) Inc., 2015, Tonsina electromagnetic and magnetic airborne geophysical survey data compilation: Alaska Division of Geological & Geophysical Surveys Geophysical Report 2015-1. http://doi.org/10.14509/29169

Table of Contents

Layer Name: metadata
Layer Description: metadata files, readme files and reports
/metadata/GPR2015-1.faq.html
/metadata/GPR2015-1.txt
/metadata/GPR2015-1.xml

Layer Name: grids_geosoft
Layer Description: Geosoft-format binary grids, these grids can be viewed in ESRI ArcMap using a free plugin from Geosoft.
/grids_geosoft/readme_tonsina_grids_geosoft.txt
/grids_geosoft/tonsina_altlasbird.grd
/grids_geosoft/tonsina_altlasbird.grd.gi
/grids_geosoft/tonsina_altlasbird.zon
/grids_geosoft/tonsina_analyticsignal.grd
/grids_geosoft/tonsina_analyticsignal.grd.gi
/grids_geosoft/tonsina_analyticsignal.zon
/grids_geosoft/tonsina_calculated1vd.grd
/grids_geosoft/tonsina_calculated1vd.grd.gi
/grids_geosoft/tonsina_calculated1vd.zon
/grids_geosoft/tonsina_dtm.grd
/grids_geosoft/tonsina_dtm.grd.gi
/grids_geosoft/tonsina_dtm.zon
/grids_geosoft/tonsina_res56khz.grd
/grids_geosoft/tonsina_res56khz.grd.gi
/grids_geosoft/tonsina_res56khz.zon
/grids_geosoft/tonsina_res7200hz.grd
/grids_geosoft/tonsina_res7200hz.grd.gi
/grids_geosoft/tonsina_res7200hz.zon
/grids_geosoft/tonsina_res900hz.grd
/grids_geosoft/tonsina_res900hz.grd.gi
/grids_geosoft/tonsina_res900hz.zon
/grids_geosoft/tonsina_residualmag.grd
/grids_geosoft/tonsina_residualmag.grd.gi
/grids_geosoft/tonsina_residualmag.zon
/grids_geosoft/tonsina_sim_magtf.grd
/grids_geosoft/tonsina_sim_magtf.grd.gi
/grids_geosoft/tonsina_sim_magtf.zon
/grids_geosoft/tonsina_tiltderivative.grd
/grids_geosoft/tonsina_tiltderivative.grd.gi
/grids_geosoft/tonsina_tiltderivative.zon

Supplemental Information


 > Project Name: Tonsina
 > Contracting Agency: State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS)
 > DGGS Section: Minerals Section
 > Program: Alaska Airborne Geophysical and Geological Mineral Inventory Program and the Alaska Strategic and Critical Minerals Assessment Capital Improvement Program
 > Funding Source: Alaska State Legislature
 > Contractor: CGG Land (U.S.) Inc.
 > Survey Flown By: CGG
 > CGG Project Number: 14030
 > DGGS Contract Manager: Abraham M. Emond
 > Data Acquisition: Digitally acquired
 > Line miles (km): 1240.76 miles (1996.76 km)
 > Data Acquisition:
 > Start Date (YYYY-MM-DD): 2014-07-25
 > End Date (YYYY-MM-DD): 2014-08-20
 > Platform: Helicopter
 > Platform: Model: AS-350-B3 Squirrel
 > Survey Altitude Model: Mean terrain clearance (height above ground)
 > Nominal Helicopter Height: 60 meters
 > Nominal Bird Height: 30 meters
 > Traverse: Line Azimuth: N15 degrees W (heading of 345 degrees)
 > Traverse: Line Spacing: 1/4 mile (402.3 m)
 > Tie: Line Azimuth: N75 degrees E (heading of 75 degrees)
 > Tie: Line Spacing: approximately 3 miles (approximately 4828 m)
 > Border lines: present around all non-parallel and non-perpendicular edges
 > Magnetics: Magnetometer: Scintrex CS3 cesium censor, mounted in bird
 > Electromagnetics: Sensor Model: Dighem(V)
 > Navigation System: Sensor: Global Positioning System
 > Navigation System: Sensor: Novatel OEM5-GL2
 > Navigation System: Method: Post-flight differential positioning
 > Additional equipment: Radar and laser altimeters, video camera, and 50/60 Hz monitors
 >
 > Operating frequencies used for the Dighem (V) system.
 >
 > 24-July through 17-August, 2014 (flts 3002:3039)
 >
 > Cx1000 1117.0 Hz coil separation = 7.96 meters
 > Cp900 927.9 Hz coil separation = 7.98 meters
 > Cx5500 5923 Hz coil separation = 7.92 meters
 > Cp7200 7281 Hz coil separation = 7.98 meters
 > Cp56k 55380 Hz coil separation = 6.31 meters
 >
 >
 > Frequencies adjusted 18-August, 2014 (flts 3042:3049)
 >
 > Cx1000 1115.2 Hz coil separation = 7.96 meters
 > Cp900 909.6 Hz coil separation = 7.98 meters
 > Cx5500 5928 Hz coil separation = 7.92 meters
 > Cp7200 7293 Hz coil separation = 7.98 meters
 > Cp56k 55410 Hz coil separation = 6.31 meters
 >

Metadata

Metadata is the data about the data and answers "Who, what, when, where, how and why?" about the dataset. Please see the DGGS Metadata README page for information about our metadata.

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.

Distribution Contact Information

Metadata Manager
Alaska Division of Geological & Geophysical Surveys
3354 College Road
Fairbanks, AK 99709-3707
Phone Number: (907)451-5020
Fax Number: (907)451-5050
E-mail: dggspubs@alaska.gov