InWF : Filtered Wrapped Interferogram

Product Description

This product corresponds to the filtered wrapped interferogram.

The geotiff file has 2 bands:

• band 1 is the filtered wrapped phase (phase difference between the two acquisitions) of the interferogram, corrected from stratified atmospheric delay (if asked) and from spectral diversity. It is by default filtered by a moving average, triangular window, filter. Multilooking is that defined with Rlooks_unw and given in nsbas.proc file.

• band 2 is either the product of the two image’s amplitudes (if ROIPAC Goldstein filter is used) or a coherence (if a Sliding window filter is used (SW)). The coherence is obtained when the sliding window average is applied on the wrapped interferogram phase: it thus quantifies the quality of the filtered phase (1: good quality, 0: no coherence).

The png file has 1 band:

• band 1 is the filtered wrapped phase of the interferogram, normalized by a color palette.

Available products

The InWF produts are available in one resolution:

• runw= 8 (resolution of interferogram wrapped)

The InWF produts are computed in two geometries (in radar : InWF_radar and in ground geometry : InWF_geo):

• InWF_radar
  • Product Description
  • Example
• InWF_geo
  • Product Description
  • Example

Processing Details

The filtering of the wrapped interferogram is done in a sliding window, and it use the coherence as a weigthing.

In the metadata file, the following parameters are the filtering options:

• FilterStrength : Strengh of the filter for the Goldstein filter, if used

• filterstyle : the selected filter (Goldstein, Sliding Window, or others)

• SWwindowsize : width of triangular subwindows for the filtering, if Sliding Window

• SWamplim : amplitude threshold