Data · collection · 2021
Helicopter-borne ground penetrating radar measurements on the Sørsdal Glacier 2017-2018
Listed in NASA Earthdata CMR
Ground penetrating radar (GPR) is an active geophysical technique that uses high frequency radio waves to map the subsurface.
Description
The basic principle of GPR measurements is the transition of electromagnetic pulses of suitable frequency down into the ground through a transmitting antenna, and to detect the reflected energy as a function of time, amplitude and phase from any subsurface targets through a receiver antenna. If the electromagnetic travel velocity of the subsurface is known, time can be converted to depth.
Wave reflections are generated from the boundaries of materials of different electromagnetic properties. The large contrast between the electromagnetic properties of rock, ice, water, and some sediments makes GPR a particularly effective method for mapping in frozen environments. A Måla ProEx radar system with a shielded antenna, centre frequency 100 MHz, connected to a handheld Garmin GPS.
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The antenna was housed in wooden box, slung on a longline, 15 metres long, from the helicopter cargo hook. Two surveys were carried out on the Sørsdal Glacier with the aim of mapping englacial meltwater channels. Outer survey bounds -68.66, 78.302 -68.65, 78.532 -68.72, 78.544 -68.73, 78.313 Survey 1 - 21/12/2017 - 11 parallel survey lines 8 km long and 2 cross profiles 3.2 km long Survey 2 - 22/01/2018 - 12 survey lines 1.3 km long
Links
Get the data
- Download the dataset. data.aad.gov.au/eds/5100/download ↗
download · from NASA CMR
Where it is published
- DOI doi.org/10.26179/5e7adfa5a8859 ↗
DOI / persistent id · from NASA CMR
Documentation and papers
- data.aad.gov.au /aadc/metadata/citation.cfm?entry_id=AAS_4342_HeloGPR_2017-2018 ↗
Citation reference for this metadata record and dataset.
documentation · from NASA CMR
- Public information for AAS project AAS_4342 secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=AAS… ↗
project · from NASA CMR
Catalogue records · 2
- CMR UMM-JSON cmr.earthdata.nasa.gov/search/concepts/C1834759924-AU_AADC.umm_json ↗
metadata API · from NASA CMR
- CMR record cmr.earthdata.nasa.gov/search/concepts/C1834759924-AU_AADC.html ↗
catalogue entry · from NASA CMR
Topics
- Stated by source
- Glaciers · Ground Penetrating Radar · HELICOPTER · Ice Growth/Melt
- Inferred from text
- Physical geography and environmental geoscience 71%
Provenance · 1 source records, 13 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| NASA Earthdata CMR | C1834759924-AU_AADC | 8 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[field].anzsrc:group:3709 | enrichment · NASA CMR | taxonomy-embedding@1.1.0 | title+keywords+description (71%) |
| concepts[instrument].gcmd_instrument:gpr | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/cryosphere/glaciers-ice-sheets/glaciers | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/cryosphere/snow-ice/ice-growth-melt | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[platform].gcmd_platform:helicopter | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| description | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/Abstract |
| license_text | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| publication_date | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| spatial | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/SpatialExtent |
| temporal | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/TemporalExtents |
| title | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/EntryTitle |
| version_label | source · NASA CMR | connector:nasa_cmr@1.0.0 |