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QGIS/python/ext-libs/owslib/crs.py
Tom Kralidis d6df3a93f3 update MetaSearch to 0.3.1
2014-09-03 08:43:11 -04:00

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21 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. """
# 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,
2082,
2083,
2085,
2086,
2091,
2092,
2093,
2096,
2097,
2098,
2105,
2106,
2107,
2108,
2109,
2110,
2111,
2112,
2113,
2114,
2115,
2116,
2117,
2118,
2119,
2120,
2121,
2122,
2123,
2124,
2125,
2126,
2127,
2128,
2129,
2130,
2131,
2132,
2169,
2170,
2171,
2172,
2173,
2174,
2175,
2176,
2177,
2178,
2179,
2180,
2193,
2199,
2200,
2206,
2207,
2208,
2209,
2210,
2211,
2212,
2319,
2320,
2321,
2322,
2323,
2324,
2325,
2326,
2327,
2328,
2329,
2330,
2331,
2332,
2333,
2334,
2335,
2336,
2337,
2338,
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2368,
2369,
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2935,
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2963,
3006,
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3050,
3051,
3058,
3059,
3068,
3114,
3115,
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3117,
3118,
3120,
3126,
3127,
3128,
3129,
3130,
3131,
3132,
3133,
3134,
3135,
3136,
3137,
3138,
3139,
3140,
3146,
3147,
3150,
3151,
3152,
3300,
3301,
3328,
3329,
3330,
3331,
3332,
3333,
3334,
3335,
3346,
3350,
3351,
3352,
3366,
3386,
3387,
3388,
3389,
3390,
3396,
3397,
3398,
3399,
3407,
3414,
3416,
3764,
3788,
3789,
3790,
3791,
3793,
3795,
3796,
3819,
3821,
3823,
3824,
3833,
3834,
3835,
3836,
3837,
3838,
3839,
3840,
3841,
3842,
3843,
3844,
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3854,
3873,
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3876,
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3878,
3879,
3880,
3881,
3882,
3883,
3884,
3885,
3888,
3889,
3906,
3907,
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3909,
3910,
3911,
4001,
4002,
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4055,
4074,
4075,
4080,
4081,
4120,
4121,
4122,
4123,
4124,
4125,
4126,
4127,
4128,
4129,
4130,
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4132,
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4134,
4135,
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4162,
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4165,
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4167,
4168,
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4170,
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4172,
4173,
4174,
4175,
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4178,
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4198,
4199,
4200,
4201,
4202,
4203,
4204,
4205,
4206,
4207,
4208,
4209,
4210,
4211,
4212,
4213,
4214,
4215,
4216,
4218,
4219,
4220,
4221,
4222,
4223,
4224,
4225,
4226,
4227,
4228,
4229,
4230,
4231,
4232,
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4259,
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4270,
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4280,
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4286,
4287,
4288,
4289,
4291,
4292,
4293,
4294,
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4296,
4297,
4298,
4299,
4300,
4301,
4302,
4303,
4304,
4306,
4307,
4308,
4309,
4310,
4311,
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4322,
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4327,
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25884,
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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 __eq__(self, other):
if isinstance(other, self.__class__):
return self.getcodeurn() == other.getcodeurn()
else:
return False
def __repr__(self):
return self.getcodeurn()
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