Project Documentation GFZ Department 1

09/04/2024

08:45 PM GAMMA Questions IPTA / SBAS: `mcf_pt` mask some output pixels

Hello Kang,
Thank you very much for your question. The origin of the missing unwrapped
points has been interesting.... Charles Werner

04/19/2024

04:35 PM GAMMA Questions GAMMA Processing: RE: Co-registration of large-baseline imterferometric pair

Hello Liu,
When the coherence is low, and the terrain is flat, use larger windows
(256x256). Is the coherence low d... Charles Werner

04/18/2024

04:40 PM GAMMA Questions GAMMA Processing: RE: Co-registration of large-baseline imterferometric pair

Dear Liu,
You have to look also at the thresholds you set for accepting offset
measurements and how the interferome... Charles Werner

04/17/2024

04:15 PM GAMMA Questions GAMMA Processing: Co-registration of large-baseline imterferometric pair

Hello,
I would look very carefully at the distribution of errors and the quality of the
geocoding.
For example, doe... Charles Werner

11/23/2023

01:05 PM GAMMA Questions IPTA / SBAS: RE: Multi_def_pt <rpatch> parameter?

Hello,
Typically the size of the patch is between 500m and 2km in ground-range and
azimuth, mostly as a function of... Charles Werner

11/22/2023

02:13 PM GAMMA Questions IPTA / SBAS: Multi_def_pt <rpatch> parameter?

Hello,
multi_def_pt divides the interferogram into patches on a rectangular grid. The
reason for this is that the r... Charles Werner

11/23/2022

01:45 PM GAMMA Questions SAR Data Preprocessing: Multilooking - a general question

Hello,
Independent observations of a scene with speckle can be performed either in the
frequency or spatial domain.
... Charles Werner

04/13/2022

04:55 PM GAMMA Questions DEM generation: pix_sigma0 or pix_gamma0, which should be used for geocoding lookup table refinement?

Hello,
Either pix_gamma0 and pix_sigma0 can be used, but the pix_gamma0 is generally
closer to the radar image and ... Charles Werner

04:55 PM GAMMA Questions DEM generation: pix_sigma0 or pix_gamma0, which should be used for geocoding lookup table refinement?

Hello,
Either pix_gamma0 and pix_sigma0 can be used, but the pix_gamma0 is generally
closer to the radar image and ... Charles Werner

01/17/2022

01:00 PM GAMMA Questions Data Import/Export: dem_import and working with DEM data with the GAMMA software

Hello,
Attached is a short readme Alaska_DEM.txt on processing the data for an DEM
download from the same USGS serv... Charles Werner