From 94578ea8ff38f4bc6b1f6f52b80ecf7359f5dfc2 Mon Sep 17 00:00:00 2001 From: Even Rouault Date: Wed, 20 Feb 2019 18:04:35 +0100 Subject: CoordinateOperation: add a hasBallparkTransformation() method that can be used to know if it includes a very approximative transformation term --- src/iso19111/c_api.cpp | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) (limited to 'src/iso19111/c_api.cpp') diff --git a/src/iso19111/c_api.cpp b/src/iso19111/c_api.cpp index b3f200fe..e731615c 100644 --- a/src/iso19111/c_api.cpp +++ b/src/iso19111/c_api.cpp @@ -5754,6 +5754,36 @@ int proj_coordoperation_is_instanciable(PJ_CONTEXT *ctx, // --------------------------------------------------------------------------- +/** \brief Return whether a coordinate operation has a "ballpark" + * transformation, + * that is a very approximate one, due to lack of more accurate transformations. + * + * Typically a null geographic offset between two horizontal datum, or a + * null vertical offset (or limited to unit changes) between two vertical + * datum. Errors of several tens to one hundred meters might be expected, + * compared to more accurate transformations. + * + * @param ctx PROJ context, or NULL for default context + * @param coordoperation Objet of type CoordinateOperation or derived classes + * (must not be NULL) + * @return TRUE or FALSE. + */ + +int proj_coordoperation_has_ballpark_transformation(PJ_CONTEXT *ctx, + const PJ *coordoperation) { + assert(coordoperation); + auto op = dynamic_cast( + coordoperation->iso_obj.get()); + if (!op) { + proj_log_error(ctx, __FUNCTION__, + "Object is not a CoordinateOperation"); + return 0; + } + return op->hasBallparkTransformation(); +} + +// --------------------------------------------------------------------------- + /** \brief Return the number of parameters of a SingleOperation * * @param ctx PROJ context, or NULL for default context -- cgit v1.2.3