GPS dataset

The GPS dataset must be stored in a shapefile of the type Point (or PointZ) and the associated .dbf file must contain the following fields

•East - A numeric field with the east coordinates (UTM or Lat/Lon)

•North - A numeric field with the north coordinates (UTM or Lat/Lon);

•Elev - A numeric field with the elevation above the sea level, in meters; if a DEM is not supplied, values must be set to 0;

•East_obs - East component of the observed displacement, or velocity, in meters, centimeters or millimeters (/year, in the case of velocity);

•Sigma_e - Standard deviation of the measurement in East direction;

•North_obs - North component of the observed displacement, or velocity, in meters, centimeters or millimeters (/year, in the case of velocity);

•Sigma_n - Standard deviation of the measurement in North direction;

•Up_obs - Vertical component of the observed displacement, or velocity, in meters, centimeters or millimeters (/year, in the case of velocity);

•Sigma_u - Standard deviation of the measurement in Up direction;

The measurement unit for displacements (or velocity) and their standard deviations must be coherent among them, i.e. all in meters, or millimiters, etc.

Further fields are added to the GPS dataset, according to the performed processing:

After Non-Linear Inversion and Linear Inversion:

•Modeled_ea - Displacement, or velocity, in the east direction.

•Modeled_no - Displacement, or velocity, in the north direction.

•Modeled_up - Displacement, or velocity, in the up direction.

The measurement unit of these fields is coherent with the input data, i.e. is the same of East_obs, North_obs, etc...

The original input shapefile is never changed: during the processing a copy with the suffix "_nonlinear", and "_linear", for the Non-Linear and Linear inversions respectively, is created with all the original shapefile fields and the new ones added.

After Forward Modeling:

•Modeled_ea - Displacement, or velocity, in the east direction.

•Modeled_no - Displacement, or velocity, in the north direction.

•Modeled_up - Displacement, or velocity, in the up direction.

The measurement unit of the displacement is coherent with the source model, i.e. is in meters (meters/year in the case of velocity).

The original input shapefile is never changed: during the processing a copy with the suffix "_forward" is created with all the original shapefile fields and the new ones added.