REMSE Remote Sensing 2072-4292 Molecular Diversity Preservation International (MDPI) 10.3390/rs4082455 remotesensing-04-02455 Correction Correction on “Towards Detecting Swath Events in TerraSAR-X Time Series to Establish NATURA 2000 Grassland Habitat Swath Management as Monitoring Parameter” SchusterChristian1* AliIftikhar1 LohmannPeter2 FrickAnnett3 FörsterMichael1 KleinschmitBirgit1 Department of Geoinformation for Environmental Planning, Technische Universität Berlin, Straße des 17. Juni 145, D-10623 Berlin, Germany; E-Mails: iffi.math@gmail.com (I.A.); michael.foerster@tu-berlin.de (M.F.); birgit.kleinschmit@tu-berlin.de (B.K.) Institute of Photogrammetry and GeoInformation, Leibniz Universität Hannover, Nienburger Str. 1, D-30167 Hannover, Germany; E-Mail: lohmann@ipi.uni-hannover.de Luftbild Umwelt Planung GmbH Potsdam, Große Weinmeisterstraße 3a, D-14469 Potsdam, Germany; E-Mail: annett.frick@lup-umwelt.de Author to whom correspondence should be addressed; E-Mail: christian.schuster@tu-berlin.de; Tel.: +49-30-314-79096. 2012 15 08 2012 4 8 2455 2456 28 06 2012 28 06 2012 © 2012 by the authors; licensee MDPI, Basel, Switzerland. 2012

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We found a mistake in the swath detection rule in Section 2.4 [1]. Specifically, the percent deviation calculation in the definition of the signal changes D1 and D2 and axiom A2 are altered. The correct version shall be:

Consequently, the proposed rule for the detection of swath events consists of two axioms (A1 and A2) that need to be satisfied. For the signal backscatter (σ°) at a specific acquisition order number (k) of the acquired scene in the time series (N), the positive or negative signal changes in percent deviation for the first (D1) and second (D2) acquisition after a potential swath event are considered as: D 1 = ( σ 0 ( k ) − σ 0 ( k − 1 ) )     /     ( −   σ 0 ( k ) )     ×     100 D 2 = ( σ 0 ( k + 1 ) − σ 0 ( k ) )     /     ( − ( σ 0 ( k ) ) × 100

The second axiom focuses on the absolute magnitude of signal change: | D 1 | ≻ ∑ i = 1 N | σ 0 ( i − 1 ) − σ 0 ( i ) | N /     ( σ 0 ( i ) ) × 100     , where     ∀ i ,     D 1 ≻     ≈ 10 % AND | D 2 | ≻ ∑ i = 1 N | σ 0 ( i − 1 ) − σ 0 ( i ) | N /     ( σ 0 ( i ) ) × 100     , where     ∀ i ,     D 2 ≻     ≈ 5 %

If (A1) and (A2) are satisfied then: σ 0 ( k ) ⇒ swath

References SchusterC.AliI.LohmannP.FrickA.FörsterM.KleinschmitB.Towards detecting swath events in TerraSAR-X time series to establish NATURA 2000 grassland habitat swath management as monitoring parameterRemote Sens201131308132210.3390/rs3071308