Envisat ASA WSS Interferometry with SNAP?

Microwave Toolbox
#21

I am now testing this pair over Mexico City

grafik
grafik.jpg685Ɨ844 213 KB

193 meters baseline and 94% burst overlap

#22

At least some fringes in the interferogram:

stack /multi-looked and filtered interferogram / coherence / topographic phase removed, multi-looked, filtered interferogram

grafik
grafik.jpg1668Ɨ913 1.93 MB

1 Like
#23

ApplyOrbit done? Those fringes ā€¦you know what I mean

How had you coregistered them?

#24

:see_no_evil:
let me process it again - I forgot to applythe orbit files this timeā€¦

Edit: Doesnā€™t get much better

grafik
grafik.jpg1660Ɨ913 1.68 MB

#25

Which workflow had you follow?

Curiousā€¦

As vertical-aligned fringes could be ellipsoid, but not horizontalā€¦

#26

import > deburst > orbit > subset > coregister > ifg (tried different variables of orbit and earth interpolation)

#27

How had you done the coregistration?
Thanks for your help

#28

the simple coregistration module, left all parameters as standard.

#29

Interestingā€¦ because I cannot apply the stack step based on Orbit initial offsetā€¦
Could you?

#30

yes, the one under Menu > Radar > Coregistration > Coregistration

#31

Have you checked visually that thereā€™s not a larger than usual shift between the images?

#32

I did use that oneā€¦ :frowning:

#33

This is in fact complicated as the ASA WSS was not synchronised, but I got one pair with 82% overlap

#34

Hi everyone
I tried to make an interferogram map for an earthquake by Envisat ASAR WSS images
but when I tried to import the file the images shown like attached image in World View
I download this image in several times and all of them were the same.

what should I do? does it correct or no?

Screenshot (167)
Screenshot (167)835Ɨ602 256 KB

#35

I noticed something similar, the World View window doesnā€™t really display the correct outlines, but the data should still be alright.

1 Like
#36

thanks for your reply
I continued by workflow chart to create interferogram:

deburst ā€”> apply orbit (delft precise)----> coregistration (output map is become like below, Iā€™m not sure if itā€™s correct or not)-----> interferogram formation (an error occured)

Screenshot (169)
Screenshot (169)1920Ɨ1080 317 KB

coregistration map

Screenshot (171)
Screenshot (171)1920Ɨ1080 127 KB

Interferogram error

#37

the coregistration completed, but not correct. More areas should be white.
Please try DEM based coregistration.

#38

for that map I used this operator tools: Radarā€“> coregistrationā€“> coregistration

then I test another way: Radarā€“> Coregistrationā€“> Dem Assisted coregistration (didnā€™t complete by "GC overhead limit"error)

how can I use DEM based coregistration?

#39

please see the FAQs on this error message.