dc.contributor.author | Mogaard, Olav | |
dc.contributor.author | Beard, Les P. | |
dc.coverage.spatial | 18151 Gran | |
dc.coverage.spatial | 19153 Nannestad | |
dc.coverage.spatial | 19154 Hurdal | |
dc.coverage.spatial | VIKEN | |
dc.coverage.spatial | INNLANDET | |
dc.coverage.spatial | GRAN | |
dc.coverage.spatial | HURDAL | |
dc.coverage.spatial | LUNNER | |
dc.coverage.spatial | NANNESTAD | |
dc.date.accessioned | 2020-07-15T08:02:19Z | |
dc.date.available | 2020-07-15T08:02:19Z | |
dc.date.issued | 2001 | |
dc.identifier.issn | 0800-3416 | |
dc.identifier.uri | https://hdl.handle.net/11250/2665331 | |
dc.description.abstract | In August, 1998 and July, 2000, helicopter geophysical surveys were carried out over an area of about 560 km2 immediately west of Hurdalssjøen and the Garder- moen airport. The purpose of the surveys was to provide geophysical informa- tion for improved geological mapping. The data were collected by The Geological Survey of Norway (NGU) personnel and processed at NGU. A combined total of 2780 line-km of VLF, radiometric, and magnetic data were acquired using a nominal 200-m line spacing. Poor performance of the EM system in 1998 yielded unusable EM data collected in 2000 are reported. These data amount to 1925 line-km. The nominal flying height was 60 m above ground level (AGL), and lines were flown in alternating directions, east-to-west or west-to-east. Noise levels were within survey specifications. All initial processing was carried out on a flight-by-flight basis. Final processing was carried out on all flight combined. Magnetic data, consisting of total field measurements collected by a cesium vapor magnetometer, were leveled by removing diurnal variations as recorded at a magnetic base station at Eggemoen airfield near Hønefoss. Radio- metric data were reduced using three-channel processing according to procedures recommended by the International Atomic Energy Agency. VLF data were reduced by removing a first-order base along each line. EM data were levelled using data from frequent high altitude excursions above 300-m AGL. Final processes data were gridded using square cells with 40-m sides. Geophysical maps were produced at a scale of 1:50 000. This report covers aspects of data acquisition and processing. | |
dc.language.iso | eng | |
dc.relation.ispartofseries | NGU-Rapport (2001.018) | |
dc.rights | Navngivelse 4.0 Internasjonal | |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/deed.no | |
dc.subject | DATABEHANDLING | |
dc.subject | RADIOMETRI | |
dc.subject | HELIKOPTERMÅLING | |
dc.subject | MAGNETOMETRI | |
dc.subject | ELEKTROMAGNETISK MÅLING | |
dc.title | Data Acquisition and processing - Helicopter Geophysical Surveys, Hurdal, 2000 | |
dc.type | Report | |
dc.description.localcode | 49634 | |
dc.source.pagenumber | 16 | |