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Fixes #1867
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source/target CRS one
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entries in grid_alternatives.sql
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Relates to https://github.com/OSGeo/proj-datumgrid/pull/65 ,
https://github.com/OSGeo/proj-datumgrid/issues/22
As EPSG has no entry for it, we create a grid_transformation, as well as a
dedicated area of use based on the extent of the grid, under the PROJ authority.
With the hope to be able to remove it once EPSG has an entry...
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a proj_create_vertical_crs_ex()
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- Transform conversion as a view, and when inserting into it, actually
insert into 3 tables: conversion_table, conversion_method and conversion_param,
so that method and parameter names are not repeated each time.
- Similarly for helmert_tranformation, insert into helmert_transformation_tabl
and coordinate_operation_method.
This reduces the db size from 6 344 704 bytes to 5 853 184 bytes, without
significant slowdown for queries.
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This work mostly consists of:
- a C++ implementation of the ISO-19111:2018 / OGC Topic 2
"Referencing by coordinates" classes to represent Datums,
Coordinate systems, CRSs (Coordinate Reference Systems) and
Coordinate Operations.
- methods to convert between this C++ modeling and WKT1, WKT2
and PROJ string representations of those objects
- management and query of a SQLite3 database of CRS and Coordinate Operation definition
- a C API binding part of those capabilities
This is all-in-one squashed commit of the work of
https://github.com/OSGeo/proj.4/pull/1040
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