diff options
Diffstat (limited to 'man/man3')
| -rw-r--r-- | man/man3/pj_init.3 | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/man/man3/pj_init.3 b/man/man3/pj_init.3 index 306339e1..a50b2860 100644 --- a/man/man3/pj_init.3 +++ b/man/man3/pj_init.3 @@ -21,6 +21,9 @@ projUV pj_fwd(projUV val, PJ *proj) projUV pj_inv(projUV val, PJ *proj) +int pj_transform(PJ *src_cs, PJ *dst_cs, long point_count, + double *x, double *y, double *z) + void pj_free(PJ *proj) .SH DESCRIPTION @@ -48,6 +51,16 @@ an inverse projection. If the projection does not have an inverse the PJ structure element \fIinv\fR will be NULL. +The \fBpj_transform\fR function may be used to transform points between +the two provided coordinate systems. In addition to converting between +cartographic projection coordinates and geographic coordinates, this function +also takes care of datum shifts if possible between the source and destination +coordinate system. Unlike \fBpj_fwd\fR and \fBpj_inv\fR it is also allowable +for the coordinate system definitions (\fBPJ *\fR) to be geographic coordinate +systems (defined as +proj=latlong). The \fBx\fR, \fBy\fR and \fBz\fR arrays +contain the input values of the points, and are replaced with the output +values. The function returns the number of points successfully transformed. + Memory associated with the projection may be freed with \fBpj_free\fR. .SH EXAMPLE The following program reads latitude and longitude values in decimal |