GAMMA Questions

Hello,

You need to terrain geocode the LOS displacement for each pass to the same DEM
segment. For each DEM segment you need to calculate the look vector using
lk_vec_lt. then you can use the program dispmap_ENU
to calculate the displacement in East North and up coordinates.

It is possible to add constraints to the solution for the deformation, such as
that there is 0. motion in the direction perpendicular to the local surface.
this would mean that the ice flows along the local gradient. For that you would
have to calculate the surface perpendicular vector for every point in the DEM
(also in ENU coordinates) and then set the value to 0.

dispmap_ENU performs an SVD least-squares solution for the surface displacement.
See the documentation.

There is a Gamma demo for using dispmap_ENU:

https://1drv.ms/u/s!Ag_xahLucCVfiWtiIyzu6Q43AItT?e=XbO49J

Best regards,

Charles

Hello Charles,

Thank you very much for your responsea, and this great tutorial!

I am trying to perform this tutorial, and some questions have arose.

- In part 1, step 4 = When I tried to perform condition_offset_estimates script, the LAT program single_class_mappinga is not available. Does it have a repository that I can install?

- In part 1, step 1 = it says:

1. last 2 bursts of IW1 of this data set plus 4 bursts from the following data set
2. We edit the burst number table A174.burst_number_table to represent this
3. decision"

How this decision came?

and also, how the A174.burst_number_table file became:

zipfile:              S1A_IW_SLC__1SDV_20171106T145146_20171106T145213_019146_02065F_6276.zip
iw1_number_of_bursts: 6
iw1_first_burst:      202.314987
iw1_last_burst:       207.314987

Sorry about so many questions,

Regards,

Kaian Fernandes

the program name is single_class_mapping not single_class_mappinga.
It is part of the LAT package. Do you have this package?

Please check again.

Best regards,
Charles

Hello Charles,

The letter "a" at the end of "single_class_mapping" came due to a problem on my keyboard, I am sorry.

The package LAT is not installed on my computer. Could I download it?

Regards,

Kaian

Hello,
Check your license agreement, if you have the LAT or not as a package.
What OS and version are you running?

Best regards,
Charles Werner

The software delivered is the binary code for LINUX of the modules:
ISP
DIFF&GEO
DISP

My OS is Ubuntu 18.04.2

Regards,

Kaian

Hello,
What is the name of the script you are calling that requires single_class_mapping?

It is the "condition_offset_estimates" on the part 1, step 4 of the tutorial.

Hello Charles,

Would you have any advice about this issue?

Cheers,

Kaian

Hello,

I strongly recommend getting the LAT package with the software. There are many
very useful temporal and spatial filtering, classification, and polarimetric
programs in the package. Please ask for a quote. I think it is very well worth
the expense.

Best regards,
Charles Werner

I know I am quite late to show up but can i get this demo also ? Since i cant find it with the link mentioned above. Gamma demo for using dispmap_ENU:

https://1drv.ms/u/s!Ag_xahLucCVfiWtiIyzu6Q43AItT?e=XbO49J