Ketchikan electromagnetic and magnetic airborne geophysical survey data compilation

The Ketchikan geophysical survey is located in southeast Alaska in the Ketchikan area, about 350 kilometers south of Juneau, Alaska. Frequency domain electromagnetic and magnetic data were collected with the DIGHEMV system from February to April 1999. A total of 4750.8 line kilometers were collected covering 1648.6 square kilometers. Line spacing was 400 meters (m). Data were collected approximately 30 m above the ground cover or tree canopy from a helicopter-towed sensor platform ('bird') on a 30-m-long line. The large trees and steep terrain resulted in an average ground clearance of 150 m. In the original 1999 release the Ketchikan survey was merged with data from several adjacent surveys (Kasaan, Hetta, and Dolomi). Map sheets and some of the other files in this data release contain data from adjacent or nearby surveys. The data, as well as additional metadata, are available from the DGGS website: http://doi.org/10.14509/30430.

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Field	Value
access_constraints	["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.", "Access Constraints: This report, map, and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below)."]
bbox-east-long	-131.578121
bbox-north-lat	55.676731
bbox-south-lat	54.906660
bbox-west-long	-133.084964
contact-email	dggspubs@alaska.gov
coupled-resource	[]
dataset-reference-date	[{"type": "publication", "value": "2020-01-01"}]
frequency-of-update	notPlanned
guid	31ff7c7d-ad9b-483a-8892-5f3c7aae667d_source
licence	["The State of Alaska makes no expressed 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."]
lineage	This lineage was generated by the FGDC CSDGM to 19139 transformation
metadata-date	2020-04-22
metadata-language	eng; USA
metadata_type	geospatial
old-spatial	{"type": "Polygon", "coordinates": [[[-133.084964, 54.90666], [-131.578121, 54.90666], [-131.578121, 55.676731], [-133.084964, 55.676731], [-133.084964, 54.90666]]]}
progress	completed
resource-type	dataset
responsible-party	[{"name": "Alaska Division of Geological & Geophysical Surveys", "roles": ["pointOfContact"]}]
spatial	{"type": "Polygon", "coordinates": [[[-133.084964, 54.90666], [-131.578121, 54.90666], [-131.578121, 55.676731], [-133.084964, 55.676731], [-133.084964, 54.90666]]]}
spatial_harvester	true
Groups	AmeriGEOSS National Provider North America
Tags	AmeriGEO AmeriGEOSS CKAN GEO GEOSS National North America United States aeromagnetic aeromagnetic data aeromagnetic map aeromagnetic survey aiken cove aiken creek aiken lake airborne geophysical survey alarm mine analytic signal apparent resistivity data apparent resistivity map apparent resistivity survey babe islands barren mountain beaver creek beaver mountain big creek black sand cove blank inlet bostwick creek bostwick inlet brennan bay bucareli bay cabin creek cannery cove cave creek chapin peak cholmondeley sound city of thorne bay clam cove clare island clarence strait clarno cove clump island conductivity survey cordova bay dall bay deichman island dog salmon creek dolomi bay dora bay dora lake downdraft lake electromagnetic data electromagnetic survey eudora mountain exploration first vertical derivative foot lake frequency domain electromagnetic data geologic geology geophysical map geophysical survey geophysics geophysics search tag george inlet goose bay goose creek government creek grant cove green monster mountain gridded data haida mine hassiah inlet helen island hetta inlet hetta lake it mine john creek kasaan bay kassa inlet kassa island keete inlet keete island ketchikan mining district khayyam mine kina creek kina lake kitkun bay lake ellen lake gertrude lake isabel lake josephine lake marge lake mary lindeman lake line data loon lake mabel bay mabel island magnetic data magnetic survey magnetics mckenzie inlet miller lake mills bay moira sound myrtle creek myrtle lake natzuhini bay nehenta bay nelson cove niblack lake nowiskay cove omar creek paul lake paul young creek peacock island phocena bay polk creek polk inlet poor man creek port johnson portage creek power lake remote sensing resistivity resistivity survey rock creek rock lake salt chuck mine saltery cove setter lake skowl arm smooth mountain summit lake sunny cove sunny creek tolstoi bay tongass narrow trocadero bay twelvemile arm twelvemile creek unlucky island vallenar creek
isopen	False
metadata_created	2025-09-24T05:53:49.730366
metadata_modified	2025-09-24T05:53:49.730376
notes	The Ketchikan geophysical survey is located in southeast Alaska in the Ketchikan area, about 350 kilometers south of Juneau, Alaska. Frequency domain electromagnetic and magnetic data were collected with the DIGHEMV system from February to April 1999. A total of 4750.8 line kilometers were collected covering 1648.6 square kilometers. Line spacing was 400 meters (m). Data were collected approximately 30 m above the ground cover or tree canopy from a helicopter-towed sensor platform ('bird') on a 30-m-long line. The large trees and steep terrain resulted in an average ground clearance of 150 m. In the original 1999 release the Ketchikan survey was merged with data from several adjacent surveys (Kasaan, Hetta, and Dolomi). Map sheets and some of the other files in this data release contain data from adjacent or nearby surveys. The data, as well as additional metadata, are available from the DGGS website: http://doi.org/10.14509/30430.
num_resources	4
num_tags	145
title	Ketchikan electromagnetic and magnetic airborne geophysical survey data compilation