SYSTEM: -V2.12.2a
NUMBER: 539 MODULE: ccmap, ccsetwcs, msctpeak SYSTEM: -V2.12.2a DATE: Tue Aug 31 09:24:53 MST 2004 FROM: valdes BUG: The code which updates image headers with a TNX/ZPX WCS solution produced by CCMAP could fail so that evaluation of coordinates from the image would not be correct or agree with CCTRAN. The failure is more likely to occur with small pixel scales and higher order distortion functions. The problem is due to an incorrect check for a singular matrix when determining the TNX coefficients for the header. When the code decides the matrix is singular, coefficients are set to zero and the evaluation is wrong. Since this either happens or doesn't happen it means that there is no problem with accuracy until the bug is triggered. The problem is in the GSURFIT math library which could also affect other tasks built on it, though no problems related to it are known currently. STATUS: The bug was identified and fixed in the math library.