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_2_2_antarctica.py
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_2_2_antarctica.py
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#Copyright (C) 2016, 2017 Drazen Tutic, Tomislav Jogun, Ana Kuvezdic Divjak
#This file is part of OSMPoliticalMap software.
#
#OSMPoliticalMap is free software: you can redistribute it and/or modify
#it under the terms of the GNU General Public License as published by
#the Free Software Foundation, either version 3 of the License, or
#(at your option) any later version.
#
#OSMPoliticalMap is distributed in the hope that it will be useful,
#but WITHOUT ANY WARRANTY; without even the implied warranty of
#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
#GNU General Public License for more details.
#
#You should have received a copy of the GNU General Public License
#along with OSMPoliticalMap. If not, see <http://www.gnu.org/licenses/>.
import ogr,sys,math,random,os
import numpy as np
# Usage: python _2_2_antarctica.py shapefile.shp
def Antarctica_Ring(g):
p_len = g.GetPointCount()
points = np.zeros((p_len,2))
for i in range(0, p_len):
p = g.GetPoint(i)
points[i,0] = p[0]
points[i,1] = p[1]
#move southest points in WebMercator to South Pole
a = 0
for i in range(0, p_len):
if points[i,1]<-85:
points[i,1]=-90
a = 1
ring = ogr.Geometry(ogr.wkbLinearRing)
for i in range (0,p_len):
ring.AddPoint(points[i,0], points[i,1])
if a == 1:
ring.Segmentize(0.1)
if ring is None:
print "Fail to create valid geometry!"
return ring
def Antarctica_Line(g):
p_len = g.GetPointCount()
points = np.zeros((p_len,2))
for i in range(0, p_len):
p = g.GetPoint(i)
points[i,0] = p[0]
points[i,1] = p[1]
#move southest points in WebMercator to South Pole
a = 0
for i in range(0, p_len):
if points[i,1]<-85:
points[i,1]=-90
a = 1
ring = ogr.Geometry(ogr.wkbLineString)
for i in range (0,p_len):
ring.AddPoint(points[i,0], points[i,1])
if a == 1:
ring.Segmentize(0.1)
if ring is None:
print "Fail to create valid geometry!"
return ring
#start of main program
driver = ogr.GetDriverByName('ESRI Shapefile')
inDataSet = driver.Open(sys.argv[1], 1)
inLayer = inDataSet.GetLayer()
for inFeature in inLayer:
geom = inFeature.GetGeometryRef()
if geom is not None:
if geom.GetGeometryName() == 'MULTIPOLYGON':
out_geom = ogr.Geometry(ogr.wkbMultiPolygon)
for i in range(0, geom.GetGeometryCount()): #iterate over polygons
poly = ogr.Geometry(ogr.wkbPolygon)
g = geom.GetGeometryRef(i) #polygon can have multiple rings
for j in range(0, g.GetGeometryCount()): #iterate over rings
ring = g.GetGeometryRef(j) #access to a ring (closed polyline)
(minX, maxX, minY, maxY) = ring.GetEnvelope()
if minY < -85:
ring = Antarctica_Ring(ring)
poly.AddGeometry(ring)
out_geom.AddGeometry(poly)
elif geom.GetGeometryName() == 'POLYGON':
out_geom = ogr.Geometry(ogr.wkbPolygon)
for i in range(0, geom.GetGeometryCount()): #iterate over rings
g = geom.GetGeometryRef(i) #access to a ring (closed polyline)
(minX, maxX, minY, maxY) = g.GetEnvelope()
if minY < -85:
g = Antarctica_Ring(g)
out_geom.AddGeometry(g)
elif geom.GetGeometryName() == 'MULTILINESTRING':
out_geom = ogr.Geometry(ogr.wkbMultiLineString)
for i in range(0, geom.GetGeometryCount()): #iterate over lines
g = geom.GetGeometryRef(i)
(minX, maxX, minY, maxY) = g.GetEnvelope()
if minY < -85:
g = Antarctica_Line(g)
out_geom.AddGeometry(g)
elif geom.GetGeometryName() == 'LINESTRING':
out_geom = ogr.Geometry(ogr.wkbLineString)
(minX, maxX, minY, maxY) = geom.GetEnvelope()
if minY < -85:
geom = Antarctica_Line(geom)
out_geom = geom
# set the geometry
inFeature.SetGeometry(out_geom)
inLayer.SetFeature(inFeature)
inFeature.Destroy()
inDataSet.Destroy()