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sampling.py
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from __future__ import division
import numpy as num
import fiona
from shapely.geometry import Point, Polygon, MultiPolygon
from shapely.geometry import shape
import glob
from osgeo import ogr, gdal, osr
PP=glob.glob('*P.shp')
poly=glob.glob('*1.shp')
n=30
num.random.seed(n*n)
#population
for p in range(len(PP)):
points=[]
for pol1 in fiona.open(PP[p]):
points.append(shape(pol1['geometry']))
polys=[]
crimeC=[]
for pol in fiona.open(poly[p]):
polys.append(Polygon(shape(pol['geometry'])))
crimeC.append(pol['properties']['Count_'])
polysb=fiona.open(poly[p]).bounds #(minx, miny, maxx, maxy)
print 'Population'+str(num.mean(crimeC))+' '+str(poly[p].replace('counts1.shp',''))
print 'Population'+str(num.var(crimeC))+' '+str(poly[p].replace('counts1.shp',''))
#random sample: randomly sample n pairs of coordinates
rsx=num.random.uniform(polysb[0],polysb[2],n)
rsy=num.random.uniform(polysb[1],polysb[3],n)
rs=[]
for i in range(len(rsx)):
rs.append(Point(rsx[i],rsy[i]))
ccrs=[]
for i in rs:
for j in range(len(polys)):
if i.within(polys[j]):
ccrs.append(crimeC[j])
estmeanrs=num.mean(num.array(ccrs))
estvarrs=num.var(num.array(ccrs))
print 'Random Sample'+str(estmeanrs)+' '+str(poly[p].replace('counts1.shp',''))
print 'Random Sample'+str(estvarrs)+' '+str(poly[p].replace('counts1.shp',''))
"""
if p==0:
spatialReference = osr.SpatialReference()
spatialReference.ImportFromProj4('+proj=utm +zone=14 +ellps=GRS80 +datum=NAD83 +units=m +no_defs')
driver = ogr.GetDriverByName('Esri Shapefile')
ds = driver.CreateDataSource('rs30.shp')
layer = ds.CreateLayer('', spatialReference, geom_type=ogr.wkbPoint)
# Add one attribute
layer.CreateField(ogr.FieldDefn('crime', ogr.OFTInteger))
defn = layer.GetLayerDefn()
for j, k in zip(rs, ccrs):
feat = ogr.Feature(defn)
feat.SetField('crime', k)
geom = ogr.CreateGeometryFromWkb(j.wkb)
feat.SetGeometry(geom)
layer.CreateFeature(feat)
feat = geom = None # destroy these
"""
#systematic sample: along with grids, randomly sample a single pair of coordinates
xr=(polysb[2]-polysb[0])/6
yr=(polysb[3]-polysb[1])/7
sysx=num.random.uniform(polysb[0],polysb[2],1)
sysy=num.random.uniform(polysb[1],polysb[3],1)
sxrange=num.arange(int(polysb[0]), int(polysb[0])+int(xr)*6,int(xr))
sxrangen=num.arange(int(polysb[0])-int(xr)*6, int(polysb[0]),int(xr))
ssx=num.append(sxrange,sxrangen)
syrange=num.arange(int(polysb[1]), int(polysb[1])+int(yr)*7,int(yr))
syrangen=num.arange(int(polysb[1])-int(yr)*7, int(polysb[1]),int(yr))
ssy=num.append(syrange,syrangen)
syss=[]
for i in ssx:
if i > polysb[0] and i <polysb[2]:
for j in ssy:
if j>polysb[1] and j<polysb[3]:
syss.append(Point(i, j))
sypoly=[]
for i in syss:
for j in range(len(polys)):
if i.within(polys[j]):
sypoly.append(crimeC[j])
estmeansy=num.mean(num.array(sypoly))
estvarsy=num.var(num.array(sypoly))
print 'Systematic Sample'+str(estmeansy)+' '+str(poly[p].replace('counts1.shp',''))
print 'Systematic Sample'+str(estvarsy)+' '+str(poly[p].replace('counts1.shp',''))
"""
if p==0:
spatialReference = osr.SpatialReference()
spatialReference.ImportFromProj4('+proj=utm +zone=14 +ellps=GRS80 +datum=NAD83 +units=m +no_defs')
driver = ogr.GetDriverByName('Esri Shapefile')
ds = driver.CreateDataSource('sys30.shp')
layer = ds.CreateLayer('', spatialReference, geom_type=ogr.wkbPoint)
# Add one attribute
layer.CreateField(ogr.FieldDefn('crime', ogr.OFTInteger))
defn = layer.GetLayerDefn()
for j, k in zip(syss, sypoly):
feat = ogr.Feature(defn)
feat.SetField('crime', k)
geom = ogr.CreateGeometryFromWkb(j.wkb)
feat.SetGeometry(geom)
layer.CreateFeature(feat)
feat = geom = None # destroy these
"""
#cluster sample: within each polygon, randomly sample a single pair of coordinates
m=int(num.random.randint(1,len(polys), size=1))
clu=polys[m-1].bounds
estmeanC=crimeC[m-1]
estvarC=0
clux=num.random.uniform(clu[0],clu[2],30)
cluy=num.random.uniform(clu[1],clu[3],30)
clus=[]
while True:
#print '1'
clux=num.random.uniform(clu[0],clu[2],1)[0]
cluy=num.random.uniform(clu[1],clu[3],1)[0]
if Point(clux, cluy).within(polys[m-1]) == True:
clus.append(Point(clux, cluy))
if len(clus) == 30:
break
print 'Cluster Sample'+str(estmeanC)+' '+str(poly[p].replace('counts1.shp',''))
print 'Cluster Sample'+str(estvarC)+' '+str(poly[p].replace('counts1.shp',''))
"""
if p ==0:
spatialReference = osr.SpatialReference()
spatialReference.ImportFromProj4('+proj=utm +zone=14 +ellps=GRS80 +datum=NAD83 +units=m +no_defs')
driver = ogr.GetDriverByName('Esri Shapefile')
ds = driver.CreateDataSource('clus30.shp')
layer = ds.CreateLayer('', spatialReference, geom_type=ogr.wkbPoint)
# Add one attribute
layer.CreateField(ogr.FieldDefn('crime', ogr.OFTInteger))
defn = layer.GetLayerDefn()
for j, k in zip(clus, [int(crimeC[m-1])]*len(clus)):
feat = ogr.Feature(defn)
feat.SetField('crime', k)
geom = ogr.CreateGeometryFromWkb(j.wkb)
feat.SetGeometry(geom)
layer.CreateFeature(feat)
feat = geom = None # destroy these
"""
#stratified sample: randomly sample on a single polygon
s=num.random.randint(1,len(polys), size=30)
strc=[]
strp=[]
for i in s:
ss=polys[i-1].bounds #boundary of each polygon
strp1=[]
while True:
#print '1'
ssx=num.random.uniform(ss[0],ss[2],1)[0]
ssy=num.random.uniform(ss[1],ss[3],1)[0]
if Point(ssx, ssy).within(polys[i-1]) == True:
strp1.append(Point(ssx, ssy))
if len(strp1) == 1:
break
strp.append(strp1[0])
#print strp
strc.append(crimeC[i-1])
estmeanstr=num.mean(num.array(strc))
estvarstr=num.var(num.array(strc))
print 'Stratified Sample'+str(estmeanstr)+' '+str(poly[p].replace('counts1.shp',''))
print 'Stratified Sample'+str(estvarstr)+' '+str(poly[p].replace('counts1.shp',''))
"""
if p == 0:
spatialReference = osr.SpatialReference()
spatialReference.ImportFromProj4('+proj=utm +zone=14 +ellps=GRS80 +datum=NAD83 +units=m +no_defs')
driver = ogr.GetDriverByName('Esri Shapefile')
ds = driver.CreateDataSource('str30.shp')
layer = ds.CreateLayer('', spatialReference, geom_type=ogr.wkbPoint)
# Add one attribute
layer.CreateField(ogr.FieldDefn('crime', ogr.OFTInteger))
defn = layer.GetLayerDefn()
for j, k in zip(strp, strc):
feat = ogr.Feature(defn)
feat.SetField('crime', k)
geom = ogr.CreateGeometryFromWkb(j.wkb)
feat.SetGeometry(geom)
layer.CreateFeature(feat)
feat = geom = None # destroy these
"""