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auto_snap.py
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auto_snap.py
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# -*- coding: utf-8 -*-
'''
auto snap les entités entre elles
'''
import geopandas as gpd
import time
import os
import sys
import pdb
import shapely.geometry as geom
from shapely.ops import nearest_points
# from fiona.crs import from_epsg
class AutoSnapper:
"""docstring foSnapperme"""
def __init__(self, shapes_dir):
os.chdir(shapes_dir)
self.t0 = time.time()
self.snapped_vertices = None
self.tf = None
def snap(self, layer, tolerance, points_path = None):
self.snapped_vertices = {}
gdf = gpd.read_file(layer)
# gdf.crs = from_epsg(2154)
if points_path is None:
if isinstance(list(gdf['geometry'])[0], geom.Polygon):
self.snap_gdf(gdf, layer, tolerance)
elif isinstance(list(gdf['geometry'])[0], geom.LineString):
self.snap_in_centroids(gdf, layer, tolerance)
else:
self.snap_lines_to_points(gdf, layer, points_path, tolerance)
self.tf = time.time()
print "execution time : ", self.tf-self.t0, " seconds"
#------------------- SAME GDF / GEOMETRY TYPE = POLYGON ----------------------------------
def insert_vertex_at(self, geometry, vertex1, vertex2, inplace = False):
point = geom.Point(vertex2)
if isinstance(geometry, geom.Polygon):
linear_ring = geom.LinearRing(geometry.exterior.coords)
coords = linear_ring.coords[:]
for i in range(0, len(coords) - 1):
line = geom.LineString([coords[i], coords[i+1]])
if point.distance(line) <= 1:
if inplace:
coords[i] = vertex1
vertex_at = i
else:
coords.insert(i+1, vertex1)
vertex_at = i + 1
return geom.Polygon(coords), vertex_at
# pdb.set_trace()
# break
# pdb.set_trace()
try:
return geom.Polygon(coords), None
except UnboundLocalError:
pdb.set_trace()
def snap_geom(self, gdf, geom1, geom2, index1, index2, tolerance):
if isinstance(geom1, geom.Polygon) and isinstance(geom2, geom.Polygon):
vertices1 = geom1.exterior.coords[:]
vertices2 = geom2.exterior.coords[:]
for i in range(0, len(vertices1)):
vertex1 = vertices1[i]
closest_vertex, vertex_index = self.get_closest_vertex(vertex1, vertices2, tolerance)
if i not in self.snapped_vertices[str(index1)] and closest_vertex != None:
self.snapped_vertices[str(index1)].append(i)
# if code_entite in ['NRO_08_003_044', 'NRO_08_003_157']:
# print "vertex ", vertex1, " at index ", i, " with closest vertex ", closest_vertex
vertices1[i] = closest_vertex
elif geom.Point(vertex1).distance(geom2) <= tolerance:
self.snapped_vertices[str(index1)].append(i)
linear_ring = geom.LinearRing(geom2.exterior.coords)
geom2, vertex_added_at = self.insert_vertex_at(geom2, vertex1, nearest_points(geom.Point(vertex1), linear_ring)[1].coords[0])
# if vertex_added_at > vertex_index +1:
# print "different indices : get_closest_vertex index = ", vertex_index, " / insert_at index = ", vertex_added_at
# elif vertex_added_at == vertex_index + 1:
# print "same indices = ", vertex_added_at
# else:
# print "WTF case !"
gdf.loc[index2, 'geometry'] = geom2
self.snapped_vertices[str(index1)].append(vertex_added_at)
return geom.Polygon(vertices1)
def get_closest_vertex(self, vertex1, vertices2, tolerance):
p1 = geom.Point(vertex1)
p2 = geom.Point(vertices2[0])
min_distance = p1.distance(p2)
closest_vertex = vertices2[0]
vertex_index = 0
for i in range(1, len(vertices2)):
# for vertex2 in vertices2[1:]:
vertex2 = vertices2[i]
p2 = geom.Point(vertex2)
distance = p1.distance(p2)
if distance < min_distance:
min_distance = distance
closest_vertex = vertex2
vertex_index = i
if min_distance <= tolerance:
return closest_vertex, vertex_index
else:
return None, vertex_index
def snap_gdf(self, gdf, layer, tolerance):
for index, row in gdf.iterrows():
self.snapped_vertices[str(index)] = []
for index, row in gdf.iterrows():
tmp_gdf = gdf.copy()
tmp_gdf['distance'] = tmp_gdf.distance(row['geometry'])
indices = tmp_gdf.index[tmp_gdf['distance'] <= tolerance]
snapped_geom = list(gdf.loc[[index]]['geometry'])[0]
print "snapping elements at row ", index
# for index_, row_ in tmp_gdf.iterrows():
for index_ in indices:
if index != index_:
snapped_geom = self.snap_geom(gdf, snapped_geom, list(gdf.loc[[index_]]['geometry'])[0], index, index_, tolerance)
gdf.loc[index, 'geometry'] = snapped_geom
gdf.to_file(layer.strip('.shp') +'_snapped.shp')
#------------------------------------------------------------------------------------------
#------------------ SAME GDF / GEOMETRY TYPE = LINESTRING -------------------------
def snap_in_centroids(self, gdf, layer, tolerance):
'''
valid only for LineString Geometries
'''
for index, row in gdf.iterrows():
print "snapping elements at head ", index
head = geom.Point(list(gdf.loc[[index]]['geometry'])[0].coords[0])
self.snap_geom_to_centroid(head, gdf, tolerance)
print "snapping elements at tail ", index
tail = geom.Point(list(gdf.loc[[index]]['geometry'])[0].coords[-1])
self.snap_geom_to_centroid(tail, gdf, tolerance)
gdf.drop('distance', axis=1, inplace=True)
gdf.to_file(layer.strip('.shp') + '_snapped.shp')
def snap_geom_to_centroid(self, point, gdf, tolerance):
'''
valid only for LineString Geometries
'''
gdf['distance'] = gdf.distance(point)
indices = gdf.index[gdf['distance'] <= tolerance].tolist()
multi_points = {}
for index in indices:
this_head = geom.Point(list(gdf.loc[[index]]['geometry'])[0].coords[0])
this_tail = geom.Point(list(gdf.loc[[index]]['geometry'])[0].coords[-1])
if point.distance(this_head) <= tolerance:
multi_points[index] = {'point': this_head, 'place': 0}
elif point.distance(this_tail) <= tolerance:
multi_points[index] = {'point': this_tail, 'place': -1}
# if len(indices) > 2:
# pdb.set_trace()
mp = geom.MultiPoint([multi_points[i]['point'] for i in multi_points.keys()])
centroid = mp.centroid
for i in multi_points.keys():
geometry = list(gdf.loc[[i]]['geometry'])[0]
coords = geometry.coords[:]
coords[multi_points[i]['place']] = centroid.coords[0]
gdf.loc[i, 'geometry'] = geom.LineString(coords)
#---------------------------------------------------------------------------------------------
#------------------- DIFFERENT GDF / GEOMETRY TYPE = LINESTRING --------------------
def snap_lines_to_points(self, lines, layer_path, points_path, tolerance):
# lines = gpd.read_file(layer_path)
points = gpd.read_file(points_path)
lines['geometry'] = lines['geometry'].apply(lambda x: self.snap_line_to_points(x, points, tolerance))
lines.to_file(layer_path.strip('.shp') + '_snapped.shp')
def snap_line_to_points(self, geometry, points, tolerance):
coords = list(geometry.coords)
# pdb.set_trace()
head = geom.Point(coords[0])
tail = geom.Point(coords[-1])
points['dist_LS'] = points.distance(geometry)
points_ = points[points['dist_LS'] <= tolerance]
# snap head
points_['dist_LS'] = points_.distance(head)
try:
point_head = list(points_[points_['dist_LS'] <= tolerance]['geometry'])[0]
coords[0] = point_head.coords[0]
except IndexError:
pass
# snap tail
points_['dist_LS'] = points_.distance(tail)
try:
point_tail = list(points_[points_['dist_LS'] <= tolerance]['geometry'])[0]
coords[-1] = point_tail.coords[0]
except IndexError:
pass
# pdb.set_trace()
return geom.LineString(coords)
if __name__ == '__main__':
layer = sys.argv[1]
tolerance = float(sys.argv[2])
try:
points_path = sys.argv[3]
except IndexError:
points_path = None
process = AutoSnapper(os.getcwd())
process.snap(layer, tolerance, points_path)