diff options
| -rw-r--r-- | src/PJ_helmert.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/src/PJ_helmert.c b/src/PJ_helmert.c index 8ba955bb..490bc2c4 100644 --- a/src/PJ_helmert.c +++ b/src/PJ_helmert.c @@ -431,8 +431,9 @@ static PJ_COORD helmert_forward_4d (PJ_COORD point, PJ *P) { /* We only need to rebuild the rotation matrix if the * observation time is different from the last call */ - if (point.xyzt.t != Q->t_obs) { - Q->t_obs = point.xyzt.t; + double t_obs = (point.xyzt.t == HUGE_VAL) ? Q->t_epoch : point.xyzt.t; + if (t_obs != Q->t_obs) { + Q->t_obs = t_obs; update_parameters(P); build_rot_matrix(P); } @@ -448,8 +449,9 @@ static PJ_COORD helmert_reverse_4d (PJ_COORD point, PJ *P) { /* We only need to rebuild the rotation matrix if the * observation time is different from the last call */ - if (point.xyzt.t != Q->t_obs) { - Q->t_obs = point.xyzt.t; + double t_obs = (point.xyzt.t == HUGE_VAL) ? Q->t_epoch : point.xyzt.t; + if (t_obs != Q->t_obs) { + Q->t_obs = t_obs; update_parameters(P); build_rot_matrix(P); } |