1.4.7.3. Sub-Pixel Analysis


Help for Sub-Pixel Positions Analysis

This function processes the sub-pixel position analysis of PSs by fitting a parabola on the amplitude
of 3 pixels around the selected point. See the reference for details.

The analysis is carried out on points selected through the function Load Mask.

The tool processes the amplitude of all images and saves a statistic of the positions. Outliers are discarded.
Separetely, the positions retrieved from the Reflectivity Map (Mean) and from the Master image are saved.
The analysis is carried out in range and azimuth.

This step is not absolutely required.
If it is not carried out, everytime the tool tries to load the results, the option to process the sub-pixel positions
is given. However, if a positive answer is not given within 5 seconds, the tool ignores sub-pixel positions.

See the Small Area Processing for a detailed analysis on a sub-region (Sub-cell positioning).

Sparse files saved in RESULTS
PosMaster.mat
PosMean.mat
MuPos.mat
SigmaPos.mat
PosAzMaster.mat
PosAzMean.mat
MuPosAz.mat
SigmaPosAz.mat

References
D. Perissin, F. Rocca, "High accuracy urban DEM using Permanent Scatterers",
IEEE Transactions on Geoscience and Remote Sensing, Volume 44, Issue 11, Nov. 2006 Pages: 3338 - 3347.