To list all the CRS names I am using "getCRSInfoList". Great method.
In some cases I would like to include also all the aliases (more than
10000 for projected crs). So you can still find the CRS with the name
you used all your live. (I'm sure many people do not know that their
authority renamed a CRS).
However I am not able to get them. The method
"IdentifiedObject::aliases()" for a CRS is returning an empty vector,
and the method "DatabaseContext::getAliases(...)" has a
"PROJ_INTERNAL" flag that makes it unlinkable.
Am I doing something wrong with "IdentifiedObject::aliases()"? Is
there any other way to do it?
If I remember well, this part of the API was something I coded early in
the PROJ 6 work, taking inspiration (and strugling to understand) from
GeoAPI classes. Various classes GenericName, LocalName, NameFactory etc
to deal with basically a string. So the API is there, there's minimum
testing for it in test/unit/test_common.cpp, but it hasn't been really
used for useful stuff.
DatabaseContext::getAliases() is used internally in situations where
identification from the main name fails.
I guess the AuthorityFactory::createXXXX() methods, and more likely the
AuthorityFactory::Private::createPropertiesSearchUsage() low level
method they all use, could be used to query the database and set the
aliases through the ALIAS_KEY property name during construction. There
will obviously be some overhead. No idea if it will be significant or not.
An alternative would be to have a C function relying on
DatabaseContext::getAliases() (or perhaps a helper method at the
IdentifiedObject level) to load the aliases on demand and return them
Even
Thanks.
Javier.
PS: EPSG:32766, projected, has an alias
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