@prefix dcat: . @prefix dct: . @prefix foaf: . @prefix gsp: . @prefix locn: . @prefix xsd: . a dcat:Dataset ; dct:description "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." ; dct:identifier "31ff7c7d-ad9b-483a-8892-5f3c7aae667d_source" ; dct:issued "2025-09-24T05:53:49.730366"^^xsd:dateTime ; dct:modified "2025-09-24T05:53:49.730376"^^xsd:dateTime ; dct:publisher ; dct:spatial [ a dct:Location ; locn:geometry "POLYGON ((-133.0850 54.9067, -131.5781 54.9067, -131.5781 55.6767, -133.0850 55.6767, -133.0850 54.9067))"^^gsp:wktLiteral ] ; dct:title "Ketchikan electromagnetic and magnetic airborne geophysical survey data compilation" ; dcat:distribution , , , ; dcat:keyword "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" . a dcat:Distribution ; dct:issued "2023-07-05T20:43:23.548431"^^xsd:dateTime ; dct:modified "2025-09-24T05:53:49.598474"^^xsd:dateTime ; dct:title "Web Resource" ; dcat:accessURL . a dcat:Distribution ; dct:description "CSDGM IMPORT ERROR: No digtinfo/formcont" ; dct:issued "2023-07-05T20:43:23.548421"^^xsd:dateTime ; dct:modified "2025-09-24T05:53:49.595994"^^xsd:dateTime ; dct:title "DGGS geophysics datasets are typically compilations of multiple digital data file formats. These formats may include: GeoTiff, ESRI shapefile, Geosoft binary grid (GRD), Microsoft Office documents, PDF, ER Mapper ERS, ASCII text files (including CSV), Geosoft ASCII grid (GXF), Geosoft database, AutoCAD DXF, Geosoft plot file (PLT), Printer files (HPP, PRN, or other), digital images (multiple formats), digital video (multiple formats), Geosoft ASCII XYZ, Geosoft ASCII files (PLY, i0, EXP), and KMZ" ; dcat:accessURL . a dcat:Distribution ; dct:issued "2023-07-05T20:43:23.548434"^^xsd:dateTime ; dct:modified "2025-09-24T05:53:49.599712"^^xsd:dateTime ; dct:title "Web Resource" ; dcat:accessURL . a dcat:Distribution ; dct:issued "2023-07-05T20:43:23.548428"^^xsd:dateTime ; dct:modified "2025-09-24T05:53:49.597242"^^xsd:dateTime ; dct:title "Web Resource" ; dcat:accessURL . a foaf:Agent ; foaf:name "US Migrating" .