TerraSAR-X Stripmap Coregistration

Microwave Toolbox
#1

I’ve been testing the coregistration feature under Radar -> Coregistration -> Coregistration with TerraSAR-X data. It seems to be working fine (with the default GUI parameters), though I frequently get this output in my terminal:

WARNING: org.jlinda.core.coregistration.CPM: COREGPM: Overall Model Test, Lines = {} is larger than 10. (Suggest model or a priori sigma not correct.)69.66013939896327
WARNING: org.jlinda.core.coregistration.CPM: COREGPM: Overall Model Test, Pixels = {} is larger than 10. (Suggest model or a priori sigma not correct.)15.28407149040717
WARNING: org.jlinda.core.coregistration.CPM: COREGPM: Overall Model Test, Lines = {} is larger than 10. (Suggest model or a priori sigma not correct.)99.46716130530281
WARNING: org.jlinda.core.coregistration.CPM: COREGPM: Overall Model Test, Pixels = {} is larger than 10. (Suggest model or a priori sigma not correct.)19.828028092737018
WARNING: org.jlinda.core.coregistration.CPM: COREGPM: Overall Model Test, Lines = {} is larger than 10. (Suggest model or a priori sigma not correct.)13.439390589982104
WARNING: org.jlinda.core.coregistration.CPM: COREGPM: Overall Model Test, Lines = {} is larger than 10. (Suggest model or a priori sigma not correct.)23.856478735376584
WARNING: org.jlinda.core.coregistration.CPM: COREGPM: Overall Model Test, Lines = {} is larger than 10. (Suggest model or a priori sigma not correct.)46.307242903527325
WARNING: org.jlinda.core.coregistration.CPM: COREGPM: Overall Model Test, Lines = {} is larger than 10. (Suggest model or a priori sigma not correct.)48.49634910246955
WARNING: org.jlinda.core.coregistration.CPM: COREGPM: Overall Model Test, Lines = {} is larger than 10. (Suggest model or a priori sigma not correct.)147.45079683711737
WARNING: org.jlinda.core.coregistration.CPM: COREGPM: Overall Model Test, Pixels = {} is larger than 10. (Suggest model or a priori sigma not correct.)15.502722033040115
WARNING: org.jlinda.core.coregistration.CPM: COREGPM: Overall Model Test, Lines = {} is larger than 10. (Suggest model or a priori sigma not correct.)15.0826826916271
WARNING: org.jlinda.core.coregistration.CPM: COREGPM: Overall Model Test, Lines = {} is larger than 10. (Suggest model or a priori sigma not correct.)46.610195460612225
-- org.jblas INFO Deleting /tmp/jblas8985879567503459599/libjblas.so
-- org.jblas INFO Deleting /tmp/jblas8985879567503459599/libjblas_arch_flavor.so
-- org.jblas INFO Deleting /tmp/jblas8985879567503459599

Would you know how to address this?

Many thanks.

#2

Try to use larger “Fine Window Width” and “Fine Window Height”, see if you still have those warnings.

Regards.

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#3

I’ll try, thanks Jun.

Do you know where I could find more details about those coregistration parameters? From their names, I already have a feel for what they mean, but just to make sure I know what the actual implementation does.

#4

Your suggestion solved the issue. Thanks Jun!

#5

Generally you can find those information in the on-line help of the operator. But the link recently has some problem. The following information are copied from the help file:

  1. Number of GCPs: The total number of GCPs used for the co-registration.
  2. Coarse Registration Window Width: The window width for cross-correlation in coarse GCP selection. It must be power of 2.
  3. Coarse Registration Window Height: The window height for cross-correlation in coarse GCP selection. It must be power of 2.
  4. Row Interpolation Factor: The row upsampling factor used in cross correlation operation. It must be power of 2.
  5. Column Interpolation Factor: The column upsampling factor used in cross correlation operation. It must be power of 2.
  6. Max Iterations: The maximum number of iterations for computing coarse slave GCP position.
  7. GCP Tolerance: The stopping criterion for slave GCP selection.
  8. Apply fine Registration: Checkbox indicating applying fine registration for complex image co-registration.
  9. Coherence Window Size: The dimension of the sliding window used in coherence computation.
  10. Coherence Threshold: Only GCPs with coherence above this threshold will be used in co-registration.
  11. Fine Registration Window Width: The window width for coherence calculation in fine GCP selection. It must be power of 2.
  12. Fine Registration Window Height: The window height for coherence calculation in fine GCP selection. It must be power of 2.
  13. Compute Coherence with Sliding Window: If selected, sliding window with dimension given in 9 will be used in coherence computation. Otherwise, coherence will be computed directly from all pixel in the Fine Registration Window without using sliding window.
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