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Estimation of instantaneous air temperature above vegetation and soil surfaces from Landsat 7 ETM+ data in northern Germany

Wloczyk, Carolin and Borg, Erik and Richter, Rudolf and Miegel, Konrad (2011) Estimation of instantaneous air temperature above vegetation and soil surfaces from Landsat 7 ETM+ data in northern Germany. International Journal of Remote Sensing, 32 (24), pp. 9119-9136. Taylor & Francis. DOI: 10.1080/01431161.2010.550332. ISSN 0143-1161.

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Official URL: http://dx.doi.org/10.1080/01431161.2010.550332

Abstract

The temperature–vegetation index method (TVX method, also called contextual method) for the area-wide mapping of instantaneous air temperature is adopted for use with Landsat 7 Enhanced Thematic Mapper Plus (ETM+) data. The method requires multispectral data consisting of bands in the red, near-infrared and thermal spectral regions, and no additional data. The approach is complemented with an iterative filtering routine for eliminating outliers and an interpolation algorithm for filling data gaps. The adopted method is applied to a multi-temporal dataset of nine ETM+ scenes, covering large parts of north-eastern Germany including the Durable Environmental Multidisciplinary Monitoring Information Network (DEMMIN) test site. Thus, for the first time the TVX method is applied to fine spatial resolution data and a central European region. The satellite-derived air temperatures (60 m spatial resolution) are compared with in situ measurements, showing an average error of about 3 K (root mean square, RMS), whereas the mean error in land surface temperature (LST) estimation is about 2 K. The results compare well with the in situ values throughout all seasons. The accuracy of about 3 K is in line with previously reported results for the TVX method (employing medium spatial resolution data) as well as for physically based approaches (ecosystem- or energy-balance models). Only remote sensing models incorporating in situ air temperature (as training data for neural networks or in multiple regression analysis) are reported to perform better in terms of RMS deviations. In the past, overestimation of air temperature by the TVX method was repeatedly observed. It is shown that the remote sensing approach tends to under- or overestimate the in situ air temperatures, depending on the in situ measurement heights. In conjunction with the attempt to assign the satellite-derived air temperature to a certain height above ground, the possibility of a simple correction for reference height is investigated. Over- and underestimations larger than 2 K seem to reflect existing differences in temperature rather than calculation errors. Furthermore, the dependence of the derived air temperature spatial pattern on different moving window sizes is shown. Possible sources of errors and limitations of the approach are discussed in detail.

Document Type:Article
Title:Estimation of instantaneous air temperature above vegetation and soil surfaces from Landsat 7 ETM+ data in northern Germany
Authors:
AuthorsInstitution or Email of Authors
Wloczyk, Carolincarolin.wloczyk@dlr.de
Borg, Erikerik.borg@dlr.de
Richter, Rudolfrudolf.richter@dlr.de
Miegel, KonradUNSPECIFIED
Date:2011
Journal or Publication Title:International Journal of Remote Sensing
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:32
DOI:10.1080/01431161.2010.550332
Page Range:pp. 9119-9136
Publisher:Taylor & Francis
ISSN:0143-1161
Status:Published
Keywords:Lufttemperatur, Landsat
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Prozesse der Landoberfläche (old)
Location: Neustrelitz , Oberpfaffenhofen
Institutes and Institutions:German Remote Sensing Data Center
Deposited By: Dr.-Ing. Carolin Wloczyk
Deposited On:14 Nov 2011 09:30
Last Modified:24 Apr 2013 16:53

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