By American Petroleum Institute
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Extra resources for API 2H Specification for Carbon Manganese Steel Plate for Offshore Platform Tubular Joints
In order to minimise interpolation artefacts, data are reported in SAR coordinates (range, azimuth) rather than in geographical coordinates. The sampling step is about 4 metres both in slant range and azimuth (ERS images have been interpolated by a factor of two in range direction). The radiometric quality of the image has been strongly improved by computing the incoherent average of the data. C-62 _____________________________ Multiple image combination for DEM generation and ground motion estimation Figure 4-19: (a) Estimated LOS velocity field across the Hayward fault.
Right: lines corresponding to zero crossings of the real and imaginary parts. These lines never cross (modulus ≠ 0). However, when the slope increases, the distance between the lines decreases. C-31 TM-19 _________________________________________________________________________ InSAR Principles The problem is more easily understood in the continuous case. Suppose that we start from a discrete set of random complex numbers p ij disposed on a square grid; then, we interpolate the real and imaginary parts of the p ij’s, by convolving them, say, with a 2-D sinc function.
3 where z i, n i are the samples of the data and of the noise. 4 For p = 0, aˆ is the value of the mode of the z i’s; for p = 1, their median; and for p = 2, their mean. In the case of phase unwrapping, we can consider the policy of minimising the differences, raised to the power p, between the unwrapped phase differences along azimuth and range Δ(a)ψ i,j, Δ(r)ψ i,j corresponding to the chosen topography, and the WPD Δ(wa )φi , j , Δ(wr )φi , j along the azimuth and range coordinates i, j. We minimise then [Ghiglia98]: C p = ∑∑ |ψ i +1, j −ψ i , j − Δ(wa )φi , j | p + ∑∑ |ψ i , j +1 −ψ i , j − Δ(wr )φi,j | p i j i j Eq.