|
1
|
|
|
# -*- coding: utf-8 -*- |
|
2
|
|
|
''' |
|
3
|
|
|
This module validates a polygon in Flanders. |
|
4
|
|
|
''' |
|
5
|
|
|
|
|
6
|
|
|
import colander |
|
7
|
|
|
import json |
|
8
|
|
|
from shapely.geometry import shape, box, mapping |
|
9
|
|
|
from oe_geoutils.utils import get_srid_from_geojson, remove_dupl_coords |
|
10
|
|
|
import logging |
|
11
|
|
|
|
|
12
|
|
|
log = logging.getLogger(__name__) |
|
13
|
|
|
|
|
14
|
|
|
|
|
15
|
|
|
class GeometryValidator: |
|
16
|
|
|
|
|
17
|
|
|
def __init__(self, node, gj): |
|
18
|
|
|
""" |
|
19
|
|
|
:param node: A colander SchemaNode. |
|
20
|
|
|
:param gj: geojson to be validated |
|
21
|
|
|
""" |
|
22
|
|
|
self.node = node |
|
23
|
|
|
self.gj = gj |
|
24
|
|
|
if self.gj is None or not self.gj: |
|
25
|
|
|
raise colander.Invalid(self.node, "geometrie is verplicht en mag niet leeg zijn") |
|
26
|
|
|
try: |
|
27
|
|
|
self.geom = shape(self.gj) |
|
28
|
|
|
except ValueError: |
|
29
|
|
|
raise colander.Invalid(self.node, 'geometrie is geen geldig GeoJson') |
|
30
|
|
|
self.srid = get_srid_from_geojson(self.gj) |
|
31
|
|
|
|
|
32
|
|
|
def _validate_geometry_type(self, geomtype): |
|
33
|
|
|
""" |
|
34
|
|
|
:param geomtype: geojson geometrie type: "MultiPolygon", "Point", ... |
|
35
|
|
|
:return: |
|
36
|
|
|
""" |
|
37
|
|
|
if self.geom.type != geomtype: |
|
38
|
|
|
raise colander.Invalid(self.node, 'geometrie is niet van het type {}'.format(geomtype)) |
|
39
|
|
|
|
|
40
|
|
|
def _validate_flanders_specifications(self): |
|
41
|
|
|
""" |
|
42
|
|
|
*coordinate system of Lambert72 is required |
|
43
|
|
|
*geometry must be inside bounding box of Flanders |
|
44
|
|
|
""" |
|
45
|
|
|
if self.srid is None or self.srid != 31370: |
|
46
|
|
|
raise colander.Invalid(self.node, |
|
47
|
|
|
'Geen geldige srid gevonden. ' |
|
48
|
|
|
'Enkel geometrien met srid 31370 (Lambert 72) worden ondersteund') |
|
49
|
|
|
b = box(19680.692555495727, 146642.51885241456, 274994.53266103653, |
|
50
|
|
|
245606.4642544454) # bounding box vlaanderen |
|
51
|
|
|
if not b.contains(self.geom): |
|
52
|
|
|
raise colander.Invalid(self.node, 'Geometrie ligt niet binnen de bounding box van Vlaanderen') |
|
53
|
|
|
|
|
54
|
|
|
def validate_multipolygon(self, max_area): |
|
55
|
|
|
""" |
|
56
|
|
|
Validate a geojson if it is a valid geometry. |
|
57
|
|
|
:param max_area: the maximum area of the geojson. |
|
58
|
|
|
Current checks are: |
|
59
|
|
|
*geojson geometrie type: "MultiPolygon" |
|
60
|
|
|
*coordinate system of Lambert72 is required |
|
61
|
|
|
*geometry must be inside bounding box of Flanders |
|
62
|
|
|
*point must be valid according to OGC-specifications |
|
63
|
|
|
*geometry must be smaller than the given max_area |
|
64
|
|
|
|
|
65
|
|
|
:raise colander.Invalid: when geojson does not satisfy the upper conditions |
|
66
|
|
|
""" |
|
67
|
|
|
self._validate_geometry_type("MultiPolygon") |
|
68
|
|
|
self._validate_flanders_specifications() |
|
69
|
|
|
if self.geom.is_empty or not self.geom.is_valid or not self.geom.is_simple: |
|
70
|
|
|
self.geom = self.geom.buffer(0) |
|
71
|
|
|
if self.geom.is_empty or not self.geom.is_valid or not self.geom.is_simple: |
|
72
|
|
|
raise colander.Invalid(self.node, |
|
73
|
|
|
'Geometrie is niet geldig ' |
|
74
|
|
|
'(bv: leeg, voldoet niet aan OGC, zelf-intersecterend,...)') |
|
75
|
|
|
self.gj.update(json.loads(json.dumps(mapping(self.geom)))) |
|
76
|
|
|
if self.gj['type'] == 'Polygon': |
|
77
|
|
|
self.gj.update({'type': 'MultiPolygon', 'coordinates': [self.gj['coordinates']]}) |
|
78
|
|
|
if self.geom.area > max_area: |
|
79
|
|
|
raise colander.Invalid(self.node, 'Geometrie is {} ha, groter dan {} ha, ' |
|
80
|
|
|
'gelieve de polygoon te verkleinen.'.format(self.geom.area / 10000, |
|
81
|
|
|
max_area / 10000)) |
|
82
|
|
|
# remove duplicate consecutive coordinates (OGC SFA en ISO 19107:2003 standard) |
|
83
|
|
|
remove_dupl_coords(self.gj["coordinates"]) |
|
84
|
|
|
return self.gj |
|
85
|
|
|
|
|
86
|
|
|
def validate_point(self): |
|
87
|
|
|
""" |
|
88
|
|
|
Validate a geojson if it is a valid point. |
|
89
|
|
|
Current checks are: |
|
90
|
|
|
*Type of geometry must be "Point" |
|
91
|
|
|
*coordinate system of Lambert72 is required |
|
92
|
|
|
*geometry must be inside bounding box of Flanders |
|
93
|
|
|
:param node: A colander SchemaNode. |
|
94
|
|
|
:param gj: geojson to be validated |
|
95
|
|
|
:raise colander.Invalid: when geojson does not satisfy the upper conditions |
|
96
|
|
|
""" |
|
97
|
|
|
self._validate_geometry_type("Point") |
|
98
|
|
|
self._validate_flanders_specifications() |
|
99
|
|
|
return self.gj |
|
100
|
|
|
|
|
101
|
|
|
|
|
102
|
|
|
class GeoJson(colander.SchemaType): |
|
103
|
|
|
""" GeoJson object Type """ |
|
104
|
|
|
|
|
105
|
|
|
def serialize(self, node, appstruct): |
|
106
|
|
|
raise NotImplementedError() |
|
107
|
|
|
|
|
108
|
|
|
def deserialize(self, node, cstruct): |
|
109
|
|
|
if cstruct != 0 and not cstruct: |
|
110
|
|
|
return colander.null |
|
111
|
|
|
try: |
|
112
|
|
|
return self.build_shape(cstruct) |
|
113
|
|
|
except Exception: |
|
114
|
|
|
raise colander.Invalid(node, "Geen geldige GeoJson: %s" % cstruct) |
|
115
|
|
|
|
|
116
|
|
|
@staticmethod |
|
117
|
|
|
def build_shape(cstruct): |
|
118
|
|
|
""" |
|
119
|
|
|
converts a value into GeoJson (if valid) |
|
120
|
|
|
raises a colander.Invalid if value cannot be transformed into GeoJson |
|
121
|
|
|
:param cstruct: The structure to be validated |
|
122
|
|
|
:return: geojson |
|
123
|
|
|
:raise colander.Invalid: when the value is no valid geojson |
|
124
|
|
|
""" |
|
125
|
|
|
if cstruct is None or not cstruct: |
|
126
|
|
|
return None |
|
127
|
|
|
s = json.dumps(cstruct) |
|
128
|
|
|
g1 = json.loads(s) |
|
129
|
|
|
shape(g1) |
|
130
|
|
|
return g1 |
|
131
|
|
|
|
|
132
|
|
|
|
|
133
|
|
|
class GeometrieSchemaNode(colander.SchemaNode): |
|
134
|
|
|
title = 'geometrie' |
|
135
|
|
|
schema_type = GeoJson |
|
136
|
|
|
max_area = 8000 |
|
137
|
|
|
|
|
138
|
|
|
def __init__(self, *args, **kwargs): |
|
139
|
|
|
if len(args) > 0 and isinstance(args[0], int): |
|
140
|
|
|
self.max_area = args[0] |
|
141
|
|
|
args = args[1:] |
|
142
|
|
|
super(GeometrieSchemaNode, self).__init__(*args, **kwargs) |
|
143
|
|
|
try: |
|
144
|
|
|
self.max_area = float(self.max_area) * 10000 |
|
145
|
|
|
except ValueError: |
|
146
|
|
|
log.error("oe_geoutils: invalid configuration for max area geometry: {}".format(self.max_area)) |
|
147
|
|
|
self.max_area = 80000000 |
|
148
|
|
|
|
|
149
|
|
|
def validator(self, node, cstruct): |
|
150
|
|
|
return GeometryValidator(node, cstruct).validate_multipolygon(self.max_area) |
|
151
|
|
|
|
|
152
|
|
|
|
|
153
|
|
|
class PointGeometrieSchemaNode(colander.SchemaNode): |
|
154
|
|
|
title = 'point geometrie' |
|
155
|
|
|
schema_type = GeoJson |
|
156
|
|
|
|
|
157
|
|
|
def validator(self, node, cstruct): |
|
158
|
|
|
return GeometryValidator(node, cstruct).validate_point() |
|
159
|
|
|
|
OnroerendErfgoed /
oe_geoutils
