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).
Various types of point data stacks are supported in the IPTA, including fcomplex, scomplex, float, int, short, byte. For each point the record contains one value of the specific type.
There are point data stacks with only a single record, such as used for the terrain height or the average deformation rate, and point data stacks with multiple records such as the stack containing the interferogram values (fcomplex) or the unwrapped phases (float).
The size of a pdata is (number of records)*(number of points in the list)*size_of(type).
© Copyrights for Documentation, Users Guide and Reference Manual by Gamma Remote Sensing, 2003.
UW, CW, TS, last change 20-Feb-2003.