Correction on “Towards Detecting Swath Events in TerraSAR-X Time Series to Establish NATURA 2000 Grassland Habitat Swath Management as Monitoring Parameter”

Christian Schuster; Iftikhar Ali; Peter Lohmann; Annett Frick; Michael Förster; Birgit Kleinschmit

doi:10.3390/rs4082455

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:

\begin{array}{l} D_{1} = (σ^{0} (k) - σ^{0} (k - 1)) / (- σ^{0} (k)) \times 100 \\ D_{2} = (σ^{0} (k + 1) - σ^{0} (k)) / (- (σ^{0} (k)) \times 100 \end{array}

The second axiom focuses on the absolute magnitude of signal change:

\begin{array}{l} | D_{1} | ≻ \frac{\sum_{i = 1}^{N} | σ^{0} (i - 1) - σ^{0} (i) |}{N} / (σ^{0} (i)) \times 100, where \forall i, D_{1} ≻ \approx 10 % \\ AND \\ | D_{2} | ≻ \frac{\sum_{i = 1}^{N} | σ^{0} (i - 1) - σ^{0} (i) |}{N} / (σ^{0} (i)) \times 100, where \forall i, D_{2} ≻ \approx 5 % \end{array}

(A2)

If (A₁) and (A₂) are satisfied then:

σ^{0} (k) \Rightarrow swath

References

Schuster, C.; Ali, I.; Lohmann, P.; Frick, A.; Förster, M.; Kleinschmit, B. Towards detecting swath events in TerraSAR-X time series to establish NATURA 2000 grassland habitat swath management as monitoring parameter. Remote Sens 2011, 3, 1308–1322. [Google Scholar]

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