Mean TerraSAR-X backscatter and in-situ measurements of near surface soil moisture and temperature including vegetation survey in August 2015 on central Yamal (Vaskiny Dachi CALM site)
The active layer above the permafrost, which seasonally thaws during summer, is an important parameter for monitoring the state of permafrost. Its thickness is typically measured locally, but a range of methods which utilize information from satellite data exist. Mostly, the normalized difference ve...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.874619 2023-05-15T13:03:32+02:00 Mean TerraSAR-X backscatter and in-situ measurements of near surface soil moisture and temperature including vegetation survey in August 2015 on central Yamal (Vaskiny Dachi CALM site) Widhalm, Barbara Bartsch, Annett Leibman, Marina O Khomutov, Artem V MEDIAN LATITUDE: 70.284208 * MEDIAN LONGITUDE: 68.906784 * SOUTH-BOUND LATITUDE: 70.283628 * WEST-BOUND LONGITUDE: 68.905067 * NORTH-BOUND LATITUDE: 70.284788 * EAST-BOUND LONGITUDE: 68.908506 * DATE/TIME START: 2015-08-19T00:00:00 * DATE/TIME END: 2015-08-27T00:00:00 2017-04-13 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.874619 https://doi.org/10.1594/PANGAEA.874619 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.874619 https://doi.org/10.1594/PANGAEA.874619 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Widhalm, Barbara; Bartsch, Annett; Leibman, Marina O; Khomutov, Artem V (2017): Active-layer thickness estimation from X-band SAR backscatter intensity. The Cryosphere, 11(1), 483-496, https://doi.org/10.5194/tc-11-483-2017 Dataset 2017 ftpangaea https://doi.org/10.1594/PANGAEA.874619 https://doi.org/10.5194/tc-11-483-2017 2023-01-20T07:33:56Z The active layer above the permafrost, which seasonally thaws during summer, is an important parameter for monitoring the state of permafrost. Its thickness is typically measured locally, but a range of methods which utilize information from satellite data exist. Mostly, the normalized difference vegetation index (NDVI) obtained from optical satellite data is used as a proxy. The applicability has been demonstrated mostly for shallow depths of active-layer thickness (ALT) below approximately 70 cm. Some permafrost areas including central Yamal are, however, characterized by larger ALT. Surface properties including vegetation structure are also represented by microwave backscatter intensity. So far, the potential of such data for estimating ALT has not been explored. We therefore investigated the relationship between ALT and X-band synthetic aperture radar (SAR) backscatter of TerraSAR-X (averages for 10 × 10 m window) in order to examine the possibility of delineating ALT with continuous and larger spatial coverage in this area and compare it to the already-established method of using NDVI from Landsat (30 m). Our results show that the mutual dependency of ALT and TerraSAR-X backscatter on land cover types suggests a connection of both parameters. A range of 5 dB can be observed for an ALT range of 100 cm (40-140 cm), and an R² of 0.66 has been determined over the calibration sites. An increase of ALT with increasing backscatter can be determined. The root mean square error (RMSE) over a comparably heterogeneous validation site with maximum ALT of > 150 cm is 20 cm. Deviations are larger for measurement locations with mixed vegetation types (especially partial coverage by cryptogam crust) with respect to the spatial resolution of the satellite data. Dataset Active layer thickness permafrost The Cryosphere PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(68.905067,68.908506,70.284788,70.283628) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
description |
The active layer above the permafrost, which seasonally thaws during summer, is an important parameter for monitoring the state of permafrost. Its thickness is typically measured locally, but a range of methods which utilize information from satellite data exist. Mostly, the normalized difference vegetation index (NDVI) obtained from optical satellite data is used as a proxy. The applicability has been demonstrated mostly for shallow depths of active-layer thickness (ALT) below approximately 70 cm. Some permafrost areas including central Yamal are, however, characterized by larger ALT. Surface properties including vegetation structure are also represented by microwave backscatter intensity. So far, the potential of such data for estimating ALT has not been explored. We therefore investigated the relationship between ALT and X-band synthetic aperture radar (SAR) backscatter of TerraSAR-X (averages for 10 × 10 m window) in order to examine the possibility of delineating ALT with continuous and larger spatial coverage in this area and compare it to the already-established method of using NDVI from Landsat (30 m). Our results show that the mutual dependency of ALT and TerraSAR-X backscatter on land cover types suggests a connection of both parameters. A range of 5 dB can be observed for an ALT range of 100 cm (40-140 cm), and an R² of 0.66 has been determined over the calibration sites. An increase of ALT with increasing backscatter can be determined. The root mean square error (RMSE) over a comparably heterogeneous validation site with maximum ALT of > 150 cm is 20 cm. Deviations are larger for measurement locations with mixed vegetation types (especially partial coverage by cryptogam crust) with respect to the spatial resolution of the satellite data. |
format |
Dataset |
author |
Widhalm, Barbara Bartsch, Annett Leibman, Marina O Khomutov, Artem V |
spellingShingle |
Widhalm, Barbara Bartsch, Annett Leibman, Marina O Khomutov, Artem V Mean TerraSAR-X backscatter and in-situ measurements of near surface soil moisture and temperature including vegetation survey in August 2015 on central Yamal (Vaskiny Dachi CALM site) |
author_facet |
Widhalm, Barbara Bartsch, Annett Leibman, Marina O Khomutov, Artem V |
author_sort |
Widhalm, Barbara |
title |
Mean TerraSAR-X backscatter and in-situ measurements of near surface soil moisture and temperature including vegetation survey in August 2015 on central Yamal (Vaskiny Dachi CALM site) |
title_short |
Mean TerraSAR-X backscatter and in-situ measurements of near surface soil moisture and temperature including vegetation survey in August 2015 on central Yamal (Vaskiny Dachi CALM site) |
title_full |
Mean TerraSAR-X backscatter and in-situ measurements of near surface soil moisture and temperature including vegetation survey in August 2015 on central Yamal (Vaskiny Dachi CALM site) |
title_fullStr |
Mean TerraSAR-X backscatter and in-situ measurements of near surface soil moisture and temperature including vegetation survey in August 2015 on central Yamal (Vaskiny Dachi CALM site) |
title_full_unstemmed |
Mean TerraSAR-X backscatter and in-situ measurements of near surface soil moisture and temperature including vegetation survey in August 2015 on central Yamal (Vaskiny Dachi CALM site) |
title_sort |
mean terrasar-x backscatter and in-situ measurements of near surface soil moisture and temperature including vegetation survey in august 2015 on central yamal (vaskiny dachi calm site) |
publisher |
PANGAEA |
publishDate |
2017 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.874619 https://doi.org/10.1594/PANGAEA.874619 |
op_coverage |
MEDIAN LATITUDE: 70.284208 * MEDIAN LONGITUDE: 68.906784 * SOUTH-BOUND LATITUDE: 70.283628 * WEST-BOUND LONGITUDE: 68.905067 * NORTH-BOUND LATITUDE: 70.284788 * EAST-BOUND LONGITUDE: 68.908506 * DATE/TIME START: 2015-08-19T00:00:00 * DATE/TIME END: 2015-08-27T00:00:00 |
long_lat |
ENVELOPE(68.905067,68.908506,70.284788,70.283628) |
genre |
Active layer thickness permafrost The Cryosphere |
genre_facet |
Active layer thickness permafrost The Cryosphere |
op_source |
Supplement to: Widhalm, Barbara; Bartsch, Annett; Leibman, Marina O; Khomutov, Artem V (2017): Active-layer thickness estimation from X-band SAR backscatter intensity. The Cryosphere, 11(1), 483-496, https://doi.org/10.5194/tc-11-483-2017 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.874619 https://doi.org/10.1594/PANGAEA.874619 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.874619 https://doi.org/10.5194/tc-11-483-2017 |
_version_ |
1766338862067482624 |