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| author | Even Rouault <even.rouault@spatialys.com> | 2019-10-02 16:33:03 +0200 |
|---|---|---|
| committer | Even Rouault <even.rouault@spatialys.com> | 2019-10-02 18:36:14 +0200 |
| commit | a167035343b1ac1d2905f17957cc974bfbfc800e (patch) | |
| tree | 94f14ea7ce04841815cbff1195a0a42db6b35dd1 /src/projections/nsper.cpp | |
| parent | 8040ef90f122f06254a36c36e20b97a5a7744a04 (diff) | |
| download | PROJ-a167035343b1ac1d2905f17957cc974bfbfc800e.tar.gz PROJ-a167035343b1ac1d2905f17957cc974bfbfc800e.zip | |
nsper: add a comment to relate it to EPSG Vertical Perspective
Diffstat (limited to 'src/projections/nsper.cpp')
| -rw-r--r-- | src/projections/nsper.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/src/projections/nsper.cpp b/src/projections/nsper.cpp index 059b9f71..852d0c98 100644 --- a/src/projections/nsper.cpp +++ b/src/projections/nsper.cpp @@ -4,6 +4,11 @@ #include "proj_internal.h" #include <math.h> +/* Note: EPSG Guidance 7-2 describes a Vertical Perspective method (EPSG::9838), + * that extends 'nsper' with ellipsoidal development, and a ellipsoidal height + * of topocentric origin for the projection plan. + */ + namespace { // anonymous namespace enum Mode { N_POLE = 0, |