From 1583a566a208d2451fb1acc8bcf16fbd8151983e Mon Sep 17 00:00:00 2001 From: Even Rouault Date: Sat, 29 Sep 2018 10:01:48 +0200 Subject: Add geographic offset transformation method. The Geographic offsets transformation adds an offset to the geographic longitude, latitude coordinates, and an offset to the ellipsoidal height. This method is normally only used when low accuracy is tolerated. It is documented as coordinate operation method code 9619 (for geographic 2D) and 9660 (for geographic 3D) in the EPSG dataset. It can also be used to implement the method Geographic2D with Height Offsets (code 9618) by noting that the input vertical component is a gravity-related height and the output vertical component is the ellispoid height (dh being the geoid undulation). It can also be used to implement the method Vertical offset (code 9616) It is used for example to transform: - from the old Greek geographic 2D CRS to the newer GGRS87 CRS - from Tokyo + JSLD69 height to WGS 84 - from Baltic 1977 height to Black Sea height It is also useful to document the implicit zero-offset transformation we do in pipelines such as +proj=pipeline +step +inv +proj=longlat +ellps=A +step +proj=longlat +ellps=B that can be explicited as +proj=pipeline +step +inv +proj=longlat +ellps=A +step +proj=geogoffset [+dlon=0 +dlat=0 +dh=0] +step +proj=longlat +ellps=B --- src/makefile.vc | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'src/makefile.vc') diff --git a/src/makefile.vc b/src/makefile.vc index cf9d878c..21db1362 100644 --- a/src/makefile.vc +++ b/src/makefile.vc @@ -61,7 +61,7 @@ support = \ pipeline = \ proj_4D_api.obj PJ_cart.obj PJ_pipeline.obj PJ_horner.obj PJ_helmert.obj \ PJ_vgridshift.obj PJ_hgridshift.obj PJ_unitconvert.obj PJ_molodensky.obj \ - PJ_deformation.obj PJ_axisswap.obj + PJ_deformation.obj PJ_axisswap.obj PJ_geogoffset.obj geodesic = geodesic.obj -- cgit v1.2.3 From fe29f8acdce81607c11a597f4bffc7ff61fa9c19 Mon Sep 17 00:00:00 2001 From: Even Rouault Date: Mon, 1 Oct 2018 12:32:52 +0200 Subject: Add a affine transformation method, and make geogoffset as a particular case of it (fixes #535) --- src/makefile.vc | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'src/makefile.vc') diff --git a/src/makefile.vc b/src/makefile.vc index 21db1362..73c68c0f 100644 --- a/src/makefile.vc +++ b/src/makefile.vc @@ -61,7 +61,7 @@ support = \ pipeline = \ proj_4D_api.obj PJ_cart.obj PJ_pipeline.obj PJ_horner.obj PJ_helmert.obj \ PJ_vgridshift.obj PJ_hgridshift.obj PJ_unitconvert.obj PJ_molodensky.obj \ - PJ_deformation.obj PJ_axisswap.obj PJ_geogoffset.obj + PJ_deformation.obj PJ_axisswap.obj PJ_affine.obj geodesic = geodesic.obj -- cgit v1.2.3