VoronoiGrid.py
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# coding=utf-8
#author: 4N
#createtime: 2021/6/9
#email: nheweijun@sina.com
from osgeo.ogr import *
from osgeo.gdal import *
#
from osgeo import ogr
import random
import time
from scipy.spatial import Voronoi,voronoi_plot_2d
import numpy as np
import random
import os
import time
print(os.path.abspath(__file__))
begin_time = time.time()
work_dir = r"E:/Data/bigdata"
driver:Driver = ogr.GetDriverByName("OpenFileGDB")
ds: DataSource = driver.Open("", 1)
if not ds:
raise Exception("打开数据失败！")
layer: Layer = ds.GetLayer(0)
feat=layer.GetFeature(0)
gdsample:Geometry=feat.GetGeometryRef()
extent = gdsample.GetEnvelope()
#裁切网格
grid_list=[]
each_x=(extent[1]-extent[0])/grid_num
each_y=(extent[3]-extent[2])/grid_num
for xn in range(grid_num+1):
for yn in range(grid_num + 1):
ring = ogr.Geometry(ogr.wkbLinearRing)
ring.AddPoint(extent[0] + xn * each_x, extent[2] + yn * each_y)
ring.AddPoint(extent[0] + xn * each_x, extent[2] + yn * each_y + each_y)
ring.AddPoint(extent[0] + xn * each_x + each_x, extent[2] + yn * each_y + each_y)
ring.AddPoint(extent[0] + xn * each_x + each_x, extent[2] + yn * each_y)
ring.AddPoint(extent[0] + xn * each_x, extent[2] + yn * each_y)
# Create polygon
grid = ogr.Geometry(ogr.wkbPolygon)
grid.AddGeometry(ring)
inter_grid:Geometry = gdsample.Intersection(grid)
if inter_grid:
if not inter_grid.IsEmpty():
if inter_grid.Area()/grid.Area()>0.5:
grid_list.append(inter_grid)
each_piece_features = create_feature*1.0/len(grid_list)
data_source: DataSource = driver.CreateDataSource(os.path.join(work_dir, "{}.shp".format(layer_name)))
outLayer = data_source.CreateLayer(layer_name, geom_type=ogr.wkbPolygon)
passnum=1
for geo in grid_list:
passnum+=1
if passnum%10==0:
continue
extent = geo.GetEnvelope()
points = []
i=0
while i<each_piece_features:
point = ogr.Geometry(ogr.wkbPoint)
x = (extent[1]-extent[0])*random.random()+extent[0]
y = (extent[3]-extent[2])*random.random()+extent[2]
point.AddPoint_2D(x,y)
if geo.Intersect(point):
points.append([x,y])
i+=1
array = np.array(points)
# 沃罗诺伊图
vor = Voronoi(array,furthest_site=False, incremental=True, qhull_options=None)
# 泰森多边形的顶点
vertices = vor.vertices
regions = vor.regions
print(time.time()-begin_time)
print("here")
vonoi_time = time.time()
add = True
for index,r in enumerate(regions):
if len(r) == 0:
continue
if -1 in r:
continue
angulars = []
for id in r:
angulars.append(vertices[id])
angulars.append(vertices[r[0]])
ring = ogr.Geometry(ogr.wkbLinearRing)
for point in angulars:
ring.AddPoint(point[0],point[1])
# Create polygon
poly = ogr.Geometry(ogr.wkbPolygon)
poly.AddGeometry(ring)
poly:Geometry= geo.Intersection(poly)
if add:
# add =False
if poly:
if poly.IsEmpty():
continue
featureDefn = outLayer.GetLayerDefn()
outFeature = ogr.Feature(featureDefn)
outFeature.SetGeometry(poly)
outLayer.CreateFeature(outFeature)
outFeature = None
else:
add=True
print(time.time()-vonoi_time)
data_source.Destroy()
ds.Destroy()