From a167035343b1ac1d2905f17957cc974bfbfc800e Mon Sep 17 00:00:00 2001 From: Even Rouault Date: Wed, 2 Oct 2019 16:33:03 +0200 Subject: nsper: add a comment to relate it to EPSG Vertical Perspective --- src/projections/nsper.cpp | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'src/projections/nsper.cpp') 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 +/* 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, -- cgit v1.2.3