1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
|
# ------------------------------------------------------------------------------
#
# Project: pygml <https://github.com/geopython/pygml>
# Authors: Fabian Schindler <fabian.schindler@eox.at>
#
# ------------------------------------------------------------------------------
# Copyright (C) 2021 EOX IT Services GmbH
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies of this Software or works derived from this Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
# ------------------------------------------------------------------------------
from typing import Optional
from collections.abc import Sequence
from .types import GeomDict
def get_dimensionality(geometry: GeomDict) -> Optional[int]:
""" Returns the dimensionality of a given GeoJSON geometry.
This is obtained by descending into the first coordinate
and using its length.
When no coordinates can be retrieved (e.g: in case of
GeometryCollections) None is returned.
>>> get_dimensionality({
... 'type': 'Polygon',
... 'coordinates': [
... [
... (0.5, 1.0),
... (0.5, 2.0),
... (1.5, 2.0),
... (1.5, 1.0),
... (0.5, 1.0)
... ]
... ]
... })
2
>>> get_dimensionality({
... 'type': 'MultiPoint',
... 'coordinates': [
... (1.0, 1.0, 1.0),
... (2.0, 2.0, 1.0),
... ]
... })
3
>>> get_dimensionality({
... 'type': 'GeometryCollection',
... 'geometries': [
... {
... 'type': 'Point',
... 'coordinates': (1.0, 1.0)
... },
... {
... 'type': 'Polygon',
... 'coordinates': [
... [(1.0, 1.0)],
... [(1.0, 1.0)],
... ]
... },
... ]
... })
"""
coordinates = geometry.get('coordinates')
if coordinates:
# drill down into nested coordinates
while isinstance(coordinates[0], Sequence):
coordinates = coordinates[0]
return len(coordinates)
return None
|
