Comments (8)
yumorishita
commented on June 6, 2024
What do you mean by topo. error? DEM error or topography-correlated tropospheric noise? Why do you think they are the error, not true deformation signals? These errors should be quite small and I wonder if they could be true deformation signals.
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sizzer13
commented on June 6, 2024
The reasons why I don't consider that is a DEM error but not a deformation
signal is that, they are quite similar with the topographic relief in the
regions. For example, the basin, the river valley and etc. are quite
consistent with the velocity results. Therefore, I'm a little curious about
how to display or just remove the topo or DEM errors in the LiCSBAS?
…On Tue, Jun 9, 2020 at 4:42 PM Yu Morishita ***@***.***> wrote:
What do you mean by topo. error? DEM error or topography-correlated
tropospheric noise? Why do you think they are the error, not true
deformation signals? These errors should be quite small and I wonder if
they could be true deformation signals.
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yumorishita
commented on June 6, 2024
I haven't implemented the function to estimate/remove the DEM error (though I have a plan to implement it).
Just for a quick check, I would suggest checking the SB network plot (network/network13.png) and time series at a point with the suspected DEM error. The impact of DEM error is proportional to the perpendicular baseline. If the time series is correlated with the baseline, the point has the DEM error. If not, the topography-correlated time series and velocity are not attributed to the DEM error.
Could you show me the SB network plot and the time series?
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sizzer13
commented on June 6, 2024
This is one of the time series and the other one is 13.png
[image: network13.png]
[image: Time-series.png]
…On Tue, Jun 9, 2020 at 5:33 PM Yu Morishita ***@***.***> wrote:
I haven't implemented the function to estimate/remove the DEM error
(though I have a plan to implement it).
Just for a quick check, I would suggest checking the SB network plot
(network/network13.png) and time series at a point with the suspected DEM
error. The impact of DEM error is proportional to the perpendicular
baseline. If the time series is correlated with the baseline, the point has
the DEM error. If not, the topography-correlated time series and velocity
are not attributed to the DEM error.
Could you show me the SB network plot and the time series?
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sizzer13
commented on June 6, 2024
Maybe I made a mistake. It is not a DEM or topographic error, but an
effect resulting from the topographic relief. So, how could we consider
this part of contribution to our final results when there appears a strong
correlation with the topography?
…On Tue, Jun 9, 2020 at 5:47 PM Zhe Su ***@***.***> wrote:
This is one of the time series and the other one is 13.png
[image: network13.png]
[image: Time-series.png]
On Tue, Jun 9, 2020 at 5:33 PM Yu Morishita ***@***.***>
wrote:
> I haven't implemented the function to estimate/remove the DEM error
> (though I have a plan to implement it).
>
> Just for a quick check, I would suggest checking the SB network plot
> (network/network13.png) and time series at a point with the suspected DEM
> error. The impact of DEM error is proportional to the perpendicular
> baseline. If the time series is correlated with the baseline, the point has
> the DEM error. If not, the topography-correlated time series and velocity
> are not attributed to the DEM error.
>
> Could you show me the SB network plot and the time series?
>
> —
> You are receiving this because you authored the thread.
> Reply to this email directly, view it on GitHub
> <#19 (comment)>,
> or unsubscribe
> <https://github.com/notifications/unsubscribe-auth/APCAZ2OJSZVY3QWPGXPEQWDRV3IE3ANCNFSM4NZX36KQ>
> .
>
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yumorishita
commented on June 6, 2024
I cannot see the network13.png and Time-series.png.
If the error could be caused by topography-correlated tropospheric noises, you can remove it using --hgt_linear option at step16.
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sizzer13
commented on June 6, 2024
The point is I have used --hgt_linear and it seems also appear the same situation there.
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yumorishita
commented on June 6, 2024
It might be caused by a velocity bias (see https://www.techrxiv.org/articles/Study_of_Systematic_Bias_in_Measuring_Surface_Deformation_with_SAR_Interferometry/11672532/1). Currently there is no approach for correcting this bias. Or the signal could be true deformation. I have no idea about the other error sources.
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