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QGIS/python/ext-libs/owslib/crs.py
Tom Kralidis 6c6f279044 upgrade OWSLib to 0.11.2
2016-07-25 11:01:19 -04:00

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22 KiB
Python
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# -*- coding: ISO-8859-15 -*-
# =============================================================================
# Copyright (c) 2011 Tom Kralidis
#
# Authors : Tom Kralidis <tomkralidis@gmail.com>
#
# Contact email: tomkralidis@gmail.com
# =============================================================================
""" API for OGC CRS constructs. """
from __future__ import (absolute_import, division, print_function)
# list of URN codes for EPSG in which axis order
# of coordinates are y,x (e.g. lat, long)
axisorder_yx = frozenset([
4326,
4258,
31466,
31467,
31468,
31469,
2166,
2167,
2168,
2036,
2044,
2045,
2065,
2081,
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2110,
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2174,
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2178,
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2193,
2199,
2200,
2206,
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2209,
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27226,
27227,
27228,
27229,
27230,
27231,
27232,
27391,
27392,
27393,
27394,
27395,
27396,
27397,
27398,
27492,
28402,
28403,
28404,
28405,
28406,
28407,
28408,
28409,
28410,
28411,
28412,
28413,
28414,
28415,
28416,
28417,
28418,
28419,
28420,
28421,
28422,
28423,
28424,
28425,
28426,
28427,
28428,
28429,
28430,
28431,
28432,
28462,
28463,
28464,
28465,
28466,
28467,
28468,
28469,
28470,
28471,
28472,
28473,
28474,
28475,
28476,
28477,
28478,
28479,
28480,
28481,
28482,
28483,
28484,
28485,
28486,
28487,
28488,
28489,
28490,
28491,
28492,
29701,
29702,
30161,
30162,
30163,
30164,
30165,
30166,
30167,
30168,
30169,
30170,
30171,
30172,
30173,
30174,
30175,
30176,
30177,
30178,
30179,
30800,
31251,
31252,
31253,
31254,
31255,
31256,
31257,
31258,
31259,
31275,
31276,
31277,
31278,
31279,
31281,
31282,
31283,
31284,
31285,
31286,
31287,
31288,
31289,
31290,
31700
])
class Crs(object):
"""Initialize a CRS construct
:param string crs: the Coordinate reference system. Examples:
* EPSG:<EPSG code>
* http://www.opengis.net/def/crs/EPSG/0/<EPSG code> (URI Style 1)
* http://www.opengis.net/gml/srs/epsg.xml#<EPSG code> (URI Style 2)
* urn:EPSG:geographicCRS:<epsg code>
* urn:ogc:def:crs:EPSG::4326
* urn:ogc:def:crs:EPSG:4326
:param string axisorder: Force / override axisorder ('xy' or 'yx')
"""
def __init__(self, crs, axisorder=None):
self.id = crs
self.naming_authority = None
self.category = None
self.type = None
self.authority = None
self.version = None
self.code = -1
self.axisorder = 'xy'
self.encoding = "code"
if axisorder is not None: # forced axisorder
self.axisorder = axisorder
values = self.id.split(':')
if self.id.find('/def/crs/') != -1: # URI Style 1
self.encoding = "uri"
vals = self.id.split('/')
self.authority = vals[5].upper()
self.code = int(vals[-1])
elif self.id.find('#') != -1: # URI Style 2
self.encoding = "uri"
vals = self.id.split('#')
self.authority = vals[0].split('/')[-1].split('.')[0].upper()
self.code = int(vals[-1])
elif len(values) > 2: # it's a URN style
self.naming_authority = values[1]
self.encoding = "urn"
if len(values) == 3: # bogus
pass
elif len(values) == 4:
self.type = values[2]
else:
self.category = values[2]
self.type = values[3]
self.authority = values[4].upper()
if len(values) == 7: # version, even if empty, is included
if values[5]:
self.version = values[5]
# code is always the last value
try:
self.code = int(values[-1])
except:
self.code = values[-1]
elif len(values) == 2: # it's an authority:code code
self.encoding = "code"
self.authority = values[0].upper()
self.code = int(values[1])
# if the user has not forced the axisorder,
# scan the list of codes that have an axis ordering of
# yx and set axis order accordingly
if axisorder is None:
if self.code in axisorder_yx:
self.axisorder = 'yx'
def getcode(self):
"""Create for example "EPSG:4326" string and return back
:returns: String code formated in "authority:code"
"""
if self.authority is not None and self.code is not None:
return '%s:%s' % (self.authority, self.code)
return None
def getcodeurn(self):
"""Create for example "urn:ogc:def:crs:EPSG::4326" string and return back
:returns: String code formated in "urn:ogc:def:authority:code"
"""
return 'urn:%s:def:crs:%s:%s:%s' % (
(self.naming_authority and self.naming_authority or "ogc"),
(self.authority or ""),
(self.version or ""),
(self.code or ""))
def getcodeuri1(self):
"""Create for example "http://www.opengis.net/def/crs/EPSG/0/4326"
string and return back
:returns: String code formated in "http://www.opengis.net/def/crs/EPSG/0/code"
"""
return 'http://www.opengis.net/def/crs/EPSG/0/%s' % self.code
def getcodeuri2(self):
"""Create for example "http://www.opengis.net/gml/srs/epsg.xml#4326"
string and return back
:returns: String code formated in "http://www.opengis.net/gml/srs/epsg.xml#code"
"""
return 'http://www.opengis.net/gml/srs/epsg.xml#%s' % self.code
def __eq__(self, other):
if isinstance(other, self.__class__):
return self.getcodeurn() == other.getcodeurn()
else:
return False
def __hash__(self):
return hash(repr(self))
def __repr__(self):
return self.getcodeurn()
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