Subsidence Map

[tewabe]

It is also my problem why???

[ABraun]

please describe your problem a bit clearer. What data are you using and why are you not happy with the results? You can include screenshots to illustrate it.

[tewabe]

Displacement mapping challenge

my study area is the same 1.While I use one month interval. It seems like convening It has some correlation with the DInSAR fringe/,however the number i saw on the displacement map is highly exaggerate? why this? [image] [image] 2. While i use one year interval. it seems like convencing on the interfrogram, but the displacement map i produce is completely wrong/it is out of logic/ ! i use band maths to modify it , but nothing changed? please give me your help? [image] [image] 3. While…

[jpestrada]

Is it possible for an interferogram to have high coherence, but no fringes? should he also consider if there are fringes in the interferogram?

[ABraun]

yes, both is possible. Coherence can be high but still yield in noisy inteferograms. For InSAR, the quality of the interferogram is more important.

[suribabu]

Dear ABraun:
Please tell me how to add the interferogram(*_split_orb_stack_ifg_Deb) of the (1-2 image and 2-3 image and 3-4 image).?

[ABraun]

as written in the other topic, currently SNAP only supports the creation of S1 image pairs with the same master. 1-2 1-3 1-4… To automate this, you can use the Snap2stamps package: a free tool to automate the SNAP-StaMPS Workflow

[hchuabe]

hey @virk_rana,
Can you please tell me how you are saying that the given values (-0.076 and +0.028) are in km? Can we change them to cm or mm in the map only?

Thanks.

[ABraun]

you can find such information in the help section

You can use the band maths to convert between the units

[despina98]

Hi dear all,
How can I have colour scale for my kml in Google earth?
thanks

[ABraun]

If you applied a color scale in SNAP it is exported as “Legend” inside the kmz file actually.

[despina98]

But I exported the kml file in MATLAB.

[ABraun]

sorry, this was not clear from your question.

[despina98]

@despina98

But I exported the kml file in MATLAB.

I also apologize that my questions were not clear.

[despina98]

Hi @ABraun ,
When I processed the Sentinel images using the PSI method in MATLAB, is the amount of displacement( ps_plot (v_do ) obtained different from the amount of displacement shown using the CSV export in QGIS? Which is the actual displacement value. I’m really confused.

[ABraun]

QGIS has its own way of color stretching. These values do not represent the total min/max values.
Also explained here: Export of products from SNAP (chapter “Notes on contrast”)

[despina98]

Thanks for your very helpful answer@ABraun,
This means I have to open the csv file in Qgis and check the minimum and maximum, it will be the actual amount of velocity? Right?

[ABraun]

No, you can set the real min/max in the QGIS symbology settings.
Please see here: Wierd values around my colored image from SNAP to QGIS - #10 by ABraun

[despina98]

thanks a lot @ABraun , I have to set like this, right?

[mdelgado]

StaMPS plots do not cover -min/max range.
Please check the function ps_plot

I cannot remember if it was 2-98% or so…