<< Click to Display Table of Contents >> Navigation:  Help Content > Interferometry Module > Displacement Modeling > Common Tools > Dataset Parameter Setting

Purpose

 

This panel is used to set InSAR and GPS parameters.

An example involving this panel can be found in the tutorial.

Technical Note

 

Through this panel it is possible to set parameters that are required for Non-Linear Inversion and Linear Inversion. The panel appearance is different according to the geodetic dataset being edited. For a GPS dataset only the coordinate system, the inversion dataset weight and the measurement unit must be set. In addiction to them, a number of parameters can be set for InSAR dataset, including the possibility of assessing offset, ramp or a quadratic surface in the inversion and setting the space correlation properties to run the uncertainty analysis.

 

About the weighting factor. The dataset weight is a measure of the importance of its contribution to the cost function, based on the difference between the observed and modeled data. After any inversion, the software automatically propose a suggested weight, that can be found in the OUTPUT Dataset(s) folder ('VIEW DATASETS - View Parameters...' menu). The meaning of this number is explained in Atzori et al. [2019] and input weights could be changed accordingly, before running again the inversion. In few iterations (new suggested weights - new inversion) the values gets stable.

Setting the dataset weight to zero excludes it from processing.

 

Input Parameter(s)

 

Coordinate system

If not set, check the 'Set...' button to define it (UTM or Lat/Lon)

 

Weigth

Weight of the dataset in the inversion (see the Technical Note).

 

Measurement unit

Measurement unit of the displacement data.

 

Invert for an orbital surface

 None: the dataset is modeled only with the input sources

 Constant offset: in addition to input sources, a constant offset is assessed

 Linear ramp: in addition to input sources, a linear ramp is assessed

 Quadratic surface: in addition to input sources, a quadratic surface in assessed.

 

Set a fixed orbital contribution

This flag allows to fix a known orbital contribution: 'Invert for an orbital surface' is disabled and the user can specify the orbital contribution parameters in two ways:

 Edit...: allow the user to input and edit the already known orbital contribution

 Get from XML...: allow the user to retrieve the orbital parameters from another processing stored in a different XML file or section.

 

Show inSAR uncertainty parameters

By checking this flag, the user can inspect and change parameters defining the spatial properties of InSAR data:

 

 Data variance: Data variance of the InSAR dataset, in square meters.

 Data covariance at zero distance: Data covariance calculated at zero distance, in square meters.

 Decreasing factor: Parameter describing the spatial decay of the InSAR data correlation.

 

General Functions

 

Commit        

End the dataset editing.

 

Cancel        

The window will be closed.

 

Help        

Specific help document section.

 

 

References

Atzori et al. (2019), InSAR full-resolution analysis of the 2017–2018 M>6 earthquakes in Mexico, Rem. Sens. Env., 234, 111461