Differences in radar return from ice-covered North Slope Lakes
Comparisons are made between L and X band synthetic aperture radar images of frozen lakes on the North Slope of Alaska and ground truth observations of the nature of their ice covers. It is shown that the differences in radar backscatter observed on different areas of a lake can be correlated with w...
Main Authors: | , , , |
---|---|
Format: | Other/Unknown Material |
Language: | unknown |
Published: |
1978
|
Subjects: | |
Online Access: | http://ntrs.nasa.gov/search.jsp?R=19780064158 |
id |
ftnasantrs:oai:casi.ntrs.nasa.gov:19780064158 |
---|---|
record_format |
openpolar |
spelling |
ftnasantrs:oai:casi.ntrs.nasa.gov:19780064158 2023-05-15T17:40:13+02:00 Differences in radar return from ice-covered North Slope Lakes Weeks, W. F. Fountain, A. G. Bryan, M. L. Elachi, C. Unclassified, Unlimited, Publicly available Aug 20, 1978 http://ntrs.nasa.gov/search.jsp?R=19780064158 unknown http://ntrs.nasa.gov/search.jsp?R=19780064158 Accession ID: 78A48067 Copyright Other Sources 43 Journal of Geophysical Research; 83; Aug. 20 1978 ftnasantrs 2012-02-15T13:32:56Z Comparisons are made between L and X band synthetic aperture radar images of frozen lakes on the North Slope of Alaska and ground truth observations of the nature of their ice covers. It is shown that the differences in radar backscatter observed on different areas of a lake can be correlated with whether or not the lake is frozen completely to the bottom at the site in question. This explanation is reasonable inasmuch as the reflection coefficient associated with the high-dielectric contrast ice/water interface is significantly higher than that associated with a low-contrast ice/soil interface. However, the presence of the ice/water interface cannot be the only condition required for the higher backscatter because the ice/water interface per se would be specular at X and L band frequencies, causing the energy returned from the interface to be reflected away from the radar receiver. The other principal factor contributing to the return of energy from the ice/water interface to the receiver is believed to be the presence in the ice of numerous vertically elongated air bubbles which would act as scatters. Other/Unknown Material north slope Alaska NASA Technical Reports Server (NTRS) |
institution |
Open Polar |
collection |
NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
43 |
spellingShingle |
43 Weeks, W. F. Fountain, A. G. Bryan, M. L. Elachi, C. Differences in radar return from ice-covered North Slope Lakes |
topic_facet |
43 |
description |
Comparisons are made between L and X band synthetic aperture radar images of frozen lakes on the North Slope of Alaska and ground truth observations of the nature of their ice covers. It is shown that the differences in radar backscatter observed on different areas of a lake can be correlated with whether or not the lake is frozen completely to the bottom at the site in question. This explanation is reasonable inasmuch as the reflection coefficient associated with the high-dielectric contrast ice/water interface is significantly higher than that associated with a low-contrast ice/soil interface. However, the presence of the ice/water interface cannot be the only condition required for the higher backscatter because the ice/water interface per se would be specular at X and L band frequencies, causing the energy returned from the interface to be reflected away from the radar receiver. The other principal factor contributing to the return of energy from the ice/water interface to the receiver is believed to be the presence in the ice of numerous vertically elongated air bubbles which would act as scatters. |
format |
Other/Unknown Material |
author |
Weeks, W. F. Fountain, A. G. Bryan, M. L. Elachi, C. |
author_facet |
Weeks, W. F. Fountain, A. G. Bryan, M. L. Elachi, C. |
author_sort |
Weeks, W. F. |
title |
Differences in radar return from ice-covered North Slope Lakes |
title_short |
Differences in radar return from ice-covered North Slope Lakes |
title_full |
Differences in radar return from ice-covered North Slope Lakes |
title_fullStr |
Differences in radar return from ice-covered North Slope Lakes |
title_full_unstemmed |
Differences in radar return from ice-covered North Slope Lakes |
title_sort |
differences in radar return from ice-covered north slope lakes |
publishDate |
1978 |
url |
http://ntrs.nasa.gov/search.jsp?R=19780064158 |
op_coverage |
Unclassified, Unlimited, Publicly available |
genre |
north slope Alaska |
genre_facet |
north slope Alaska |
op_source |
Other Sources |
op_relation |
http://ntrs.nasa.gov/search.jsp?R=19780064158 Accession ID: 78A48067 |
op_rights |
Copyright |
_version_ |
1766141092054433792 |