ENH: allow to check for specific WKT flavor in the is_wkt() function

[jorisvandenbossche]

There is a is_wkt function that allows you to check if a given string is a WKT string:

pyproj/pyproj/_crs.pyx

Lines 32 to 48 in 2d3cc7e

	def is_wkt(str proj_string not None):
	"""
	.. versionadded:: 2.0.0
	Check if the input projection string is in the Well-Known Text format.
	Parameters
	----------
	proj_string: str
	The projection string.
	Returns
	-------
	bool: True if the string is in the Well-Known Text format
	"""
	cdef bytes b_proj_string = cstrencode(proj_string)
	return proj_context_guess_wkt_dialect(NULL, b_proj_string) != PJ_GUESSED_NOT_WKT

The proj method it is using for that (proj_context_guess_wkt_dialect) should also allow to check for an exact flavor. So there could be an optional version keyword, to allow something like is_wkt(..., version="WKT2_2019")?

[snowman2]

Yes, that is possible to check for a specific version: https://proj.org/development/reference/datatypes.html#c.PJ_GUESSED_WKT_DIALECT

Another alternative could be to add a new function that returns the WKT version.

[snowman2]

Thoughts on adding a new method called something like guess_wkt_version that returns the WktVersion or None if it is not a WKT?