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 format of an IPTA point mask corresponds to a point data stack (with a single record only) of unsigned char. For each point the record contains the unsigned char value 0 (not valid, not considered in processing) or 1 ( valid, considered in processing).
For a point list more than one point data stack of mask values can be in use to distinguish different groups or qualities of points while still maintaining only one full point list.
The size of a pmask is (number of points in the list)*1 bytes.
© Copyrights for Documentation, Users Guide and Reference Manual by Gamma Remote Sensing, 2003.
UW, CW, TS, last change 20-Feb-2003.