In the IPTA point lists contain the coordinates (range and azimuth pixel number relative to the reference SLC geometry) of the selected points. Data at these points (SLC values, interferogram values, ...) are stored in point data stacks with each record corresponding to a different SLC or interferogram. The point data stack of mask values contains for each point a flag (0 or 1) which indicates if the data of a point are considered (1) or not considered (0).
The ppos is a point data stack of interpolated point target positions. The coordinates contained in the plist are integer coordiantes. In the case of point targets the position can be determined to fractional pixels. The interpolated positions, i.e. the real valued point list coordinates are stored in the ppos.
The format of an IPTA point list corresponds to a point data stack (with a single record only) of fcomplex (pairs of float). For each point the record contains the real valued range and azimuth coordinates relative to the reference SLC geometry of the point list.
The size of a ppos is (number of points in the list)*8 bytes.
© Copyrights for Documentation, Users Guide and Reference Manual by Gamma Remote Sensing, 2003.
UW, CW, TS, last change 20-Feb-2003.