Retrieval of agricultural crop height from space: A comparison of SAR techniques

Please use this identifier to cite or link to this item: http://hdl.handle.net/10045/60328
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dc.contributorSeñales, Sistemas y Telecomunicaciónes_ES
dc.contributor.authorErten, Esra-
dc.contributor.authorLopez-Sanchez, Juan M.-
dc.contributor.authorYuzugullu, Onur-
dc.contributor.authorHajnsek, Irena-
dc.contributor.otherUniversidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señales_ES
dc.contributor.otherUniversidad de Alicante. Instituto Universitario de Investigación Informáticaes_ES
dc.date.accessioned2016-11-29T07:39:40Z-
dc.date.available2016-11-29T07:39:40Z-
dc.date.issued2016-12-15-
dc.identifier.citationRemote Sensing of Environment. 2016, 187: 130-144. doi:10.1016/j.rse.2016.10.007es_ES
dc.identifier.issn0034-4257 (Print)-
dc.identifier.issn1879-0704 (Online)-
dc.identifier.urihttp://hdl.handle.net/10045/60328-
dc.description.abstractThis paper deals with the retrieval of agricultural crop height from space by using multipolarization Synthetic Aperture Radar (SAR) images. Coherent and incoherent crop height estimation methods are discussed for the first time with a unique TanDEM-X dataset acquired over rice cultivation areas. Indeed, with its polarimetric and interferometric capabilities, the TanDEM-X mission enables the tracking of crop height through interferometric SAR (InSAR), polarimetric interferometric SAR (PolInSAR) and the inversion of radiative transfer-based backscattering model. The paper evaluates the three aforementioned techniques simultaneously with a data set acquired in September 2014 and 2015 over rice fields in Turkey during their reproductive stage. The assessment of the absolute height accuracy and the limitations of the approaches are provided. In-situ measurements conducted in the same cultivation periods are used for validation purposes. The PolInSAR and morphological backscattering model results showed better performance with low RMSEs (12 and 13 cm) compared to the differential InSAR result having RMSE of 18 cm. The spatial baseline, i.e. the distance between satellites, is a key parameter for coherent methods such as InSAR and PolInSAR. Its effect on the absolute height accuracy is discussed using TanDEM-X pairs separated by a baseline of 101.7m and 932m. Although the InSAR based approach is demonstrated to provide sufficient crop height accuracy, the availability of a precise vegetation-free digital elevation model and a structurally dense crop are basic requirements for achieving high accuracy. The PolInSAR approach provides reliable crop height estimation if the spatial baseline is large enough for the inversion. The impact of increasing spatial baseline on the absolute accuracy of the crop height estimation is evident for both methods. However, PolInSAR is more cost-efficient, e.g. there is no need for phase unwrapping and any external vegetation free surface elevation data. Instead, the usage of radiative transfer based backscattering models provides not only crop height but also other biophysical properties of the crops with consistent accuracy. The efficient retrieval of crop height with backscattering model is achieved by metamodelling, which makes the computational cost of backscattering inversion comparable to the ones of the coherent methods. However, effectiveness depends on not only the backscattering model, but also the integration of agronomic crop growth rules. Motivated by these results, a combination of backscattering and PolInSAR inversion models would provide a successful method of future precision farming studies.es_ES
dc.description.sponsorshipThis work has been supported by the Scientific and Technological Research Council of Turkey (TUBITAK) under project 113Y446, by the Spanish Ministry of Economy and Competitiveness (MINECO) and EU FEDER under projects TEC2011-28201-C02-02 and TIN2014-55413-C2-2-P.es_ES
dc.languageenges_ES
dc.publisherElsevieres_ES
dc.rights© 2016 Elsevier Inc.es_ES
dc.subjectHeight estimationes_ES
dc.subjectTanDEM-Xes_ES
dc.subjectRicees_ES
dc.subjectSynthetic Aperture Radares_ES
dc.subjectPolSARes_ES
dc.subjectInterferometryes_ES
dc.subjectPolInSARes_ES
dc.subjectMetamodeles_ES
dc.subjectAgriculturees_ES
dc.subject.otherTeoría de la Señal y Comunicacioneses_ES
dc.titleRetrieval of agricultural crop height from space: A comparison of SAR techniqueses_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.peerreviewedsies_ES
dc.identifier.doi10.1016/j.rse.2016.10.007-
dc.relation.publisherversionhttp://dx.doi.org/10.1016/j.rse.2016.10.007es_ES
dc.identifier.cvIDA8722372-
dc.rights.accessRightsinfo:eu-repo/semantics/openAccesses_ES
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