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Non-trivial updates:
- some vertical CRS are now encoded as DerivedVerticalCRS. e.g EPSG:8228
"NAVD88 height (ft)", with base EPSG:5703 "NAVD88 height". As we don't
have support in our PROJ db model for DerivedVerticalCRS, modify the
import script to 'resolve' the derivation up to the original datum.
- Method EPSG:1069 'Change of Vertical Unit' is no longer used. It is
replaced by a generic-purpose EPSG:1104 method that doesn't take any
conversion factor. And generic conversions EPSG:7812 and EPSG:7813 are
now used in concatenated operations, which require code changes as
well.
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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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