A novel approach to estimate soil moisture under vegetation using partial polarimetric ALOS PALSAR data
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| Title: | Main Title: A novel approach to estimate soil moisture under vegetation using partial polarimetric ALOS PALSAR data |
| Description: | Abstract: A major impediment to accurate quantitative retrievals of soil moisture from SAR is the disturbing effect caused by vegetation and surface roughness. With most operational space borne systems it is not possible to separate the different scattering contributions of the soil and vegetation components. In this paper we use the coherent-on-receive dual-polarized standard acquisitions (FBD343) of PALSAR aboard the Advanced Land Observing Satellite (ALOS “Daichi”) acquired over an arable land test site in Western Germany. By applying a PolSAR decomposition technique, namely the H/A/Alpha decomposition, we exploit the phase information to increase the amount of observables. The potential to derive information on biomass and surface roughness from the dual-pol data is investigated based on correlation analyses between PALSAR observables and in situ measurements. High sensitivities towards surface roughness and crop biomass could be ascertained. Using these findings, we estimate surface roughness ks and sugar beet total wet weight with RMS errors of 0.11 and 2.66 kg/m², respectively. The good quality of the estimates allows correcting the backscattering coefficients for the surface roughness effects. In a first test the accuracy of soil moisture retrievals on bare soil could be increased from 4.5 to 3.6 Vol.-% using the roughness correction. Our findings give a promising outlook in terms of the possibility to develop an operational soil moisture retrieval model for PALSAR data collected in the FBD mode. |
Responsible Party
| Creators: | Christian N. Koyama (Author), Karl Schneider (Author) |
| Publisher: | - |
| Publication Year: | 2013 |
Topic
| TR32 Topic: | Remote Sensing |
| Related Subproject: | C3 |
| Subjects: | Keywords: PALSAR, ALOS, Soil Moisture |
File Details
| Filename: | 2010_Koyama_ISPRS2010.pdf |
| Data Type: | Text - Event Paper |
| Size: | 6 Pages |
| File Size: | 484 KB |
| Date: | Issued: 09.08.2010 |
| Mime Type: | application/pdf |
| Data Format: | |
| Language: | English |
| Status: | Completed |
Constraints
| Download Permission: | Only Project Members |
| General Access and Use Conditions: | For internal use only |
| Access Limitations: | For internal use only |
| Licence: | [TR32DB] Data policy agreement |
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Specific Information - Publication
| Publication Status: | Published |
| Review Status: | Peer reviewed |
| Publication Type: | Event Paper |
| Proceedings Title: | Networking the World with Remote Sensing |
| Number of Pages: | 6 (421 - 426) |
| Event: | ISPRS Technical Commission VIII Symposium |
| Event Type: | Conference |
| Event Location: | Kyoto, Japan |
| Event Duration: | 9th of August, 2010 - 12th of August, 2010 |
Metadata Details
| Metadata Creator: | Christian N. Koyama |
| Metadata Created: | 03.12.2013 |
| Metadata Last Updated: | 03.12.2013 |
| Subproject: | C3 |
| Funding Phase: | 1 |
| Metadata Language: | English |
| Metadata Version: | V50 |
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| Page Visits: | 928 |
| Metadata Downloads: | 0 |
| Dataset Downloads: | 3 |
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