/
generate_tiles_summer.py
executable file
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/
generate_tiles_summer.py
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#!/usr/bin/env python
from math import pi,cos,sin,log,exp,atan
from subprocess import call
import sys, os
from Queue import Queue
import threading
try:
import mapnik2 as mapnik
except:
import mapnik
DEG_TO_RAD = pi/180
RAD_TO_DEG = 180/pi
# Default number of rendering threads to spawn, should be roughly equal to number of CPU cores available
NUM_THREADS = 4
def minmax (a,b,c):
a = max(a,b)
a = min(a,c)
return a
class GoogleProjection:
def __init__(self,levels=18):
self.Bc = []
self.Cc = []
self.zc = []
self.Ac = []
c = 256
for d in range(0,levels):
e = c/2;
self.Bc.append(c/360.0)
self.Cc.append(c/(2 * pi))
self.zc.append((e,e))
self.Ac.append(c)
c *= 2
def fromLLtoPixel(self,ll,zoom):
d = self.zc[zoom]
e = round(d[0] + ll[0] * self.Bc[zoom])
f = minmax(sin(DEG_TO_RAD * ll[1]),-0.9999,0.9999)
g = round(d[1] + 0.5*log((1+f)/(1-f))*-self.Cc[zoom])
return (e,g)
def fromPixelToLL(self,px,zoom):
e = self.zc[zoom]
f = (px[0] - e[0])/self.Bc[zoom]
g = (px[1] - e[1])/-self.Cc[zoom]
h = RAD_TO_DEG * ( 2 * atan(exp(g)) - 0.5 * pi)
return (f,h)
class RenderThread:
def __init__(self, tile_dir, mapfile, q, printLock, maxZoom):
self.tile_dir = tile_dir
self.q = q
self.m = mapnik.Map(256, 256)
self.printLock = printLock
# Load style XML
mapnik.load_map(self.m, mapfile, True)
# Obtain <Map> projection
self.prj = mapnik.Projection(self.m.srs)
# Projects between tile pixel co-ordinates and LatLong (EPSG:4326)
self.tileproj = GoogleProjection(maxZoom+1)
def render_tile(self, tile_uri, x, y, z):
# Calculate pixel positions of bottom-left & top-right
p0 = (x * 256, (y + 1) * 256)
p1 = ((x + 1) * 256, y * 256)
# Convert to LatLong (EPSG:4326)
l0 = self.tileproj.fromPixelToLL(p0, z);
l1 = self.tileproj.fromPixelToLL(p1, z);
# Convert to map projection (e.g. mercator co-ords EPSG:900913)
c0 = self.prj.forward(mapnik.Coord(l0[0],l0[1]))
c1 = self.prj.forward(mapnik.Coord(l1[0],l1[1]))
# Bounding box for the tile
if hasattr(mapnik,'mapnik_version') and mapnik.mapnik_version() >= 800:
bbox = mapnik.Box2d(c0.x,c0.y, c1.x,c1.y)
else:
bbox = mapnik.Envelope(c0.x,c0.y, c1.x,c1.y)
render_size = 256
self.m.resize(render_size, render_size)
self.m.zoom_to_box(bbox)
if(self.m.buffer_size < 128):
self.m.buffer_size = 128
# Render image with default Agg renderer
im = mapnik.Image(render_size, render_size)
mapnik.render(self.m, im)
im.save(tile_uri, 'png256')
def loop(self):
while True:
#Fetch a tile from the queue and render it
r = self.q.get()
if (r == None):
self.q.task_done()
break
else:
(name, tile_uri, x, y, z) = r
exists= ""
if os.path.isfile(tile_uri):
exists= "exists"
else:
self.render_tile(tile_uri, x, y, z)
bytes=os.stat(tile_uri)[6]
empty= ''
if bytes == 103:
empty = " Empty Tile "
self.printLock.acquire()
print name, ":", z, x, y, exists, empty
self.printLock.release()
self.q.task_done()
def render_tiles(bbox, mapfile, tile_dir, minZoom=1,maxZoom=18, name="unknown", num_threads=NUM_THREADS, tms_scheme=False):
print "render_tiles(",bbox, mapfile, tile_dir, minZoom,maxZoom, name,")"
# Launch rendering threads
queue = Queue(32)
printLock = threading.Lock()
renderers = {}
for i in range(num_threads):
renderer = RenderThread(tile_dir, mapfile, queue, printLock, maxZoom)
render_thread = threading.Thread(target=renderer.loop)
render_thread.start()
#print "Started render thread %s" % render_thread.getName()
renderers[i] = render_thread
if not os.path.isdir(tile_dir):
os.mkdir(tile_dir)
gprj = GoogleProjection(maxZoom+1)
ll0 = (bbox[0],bbox[3])
ll1 = (bbox[2],bbox[1])
for z in range(minZoom,maxZoom + 1):
px0 = gprj.fromLLtoPixel(ll0,z)
px1 = gprj.fromLLtoPixel(ll1,z)
# check if we have directories in place
zoom = "%s" % z
if not os.path.isdir(tile_dir + zoom):
os.mkdir(tile_dir + zoom)
for x in range(int(px0[0]/256.0),int(px1[0]/256.0)+1):
# Validate x co-ordinate
if (x < 0) or (x >= 2**z):
continue
# check if we have directories in place
str_x = "%s" % x
if not os.path.isdir(tile_dir + zoom + '/' + str_x):
os.mkdir(tile_dir + zoom + '/' + str_x)
for y in range(int(px0[1]/256.0),int(px1[1]/256.0)+1):
# Validate x co-ordinate
if (y < 0) or (y >= 2**z):
continue
# flip y to match OSGEO TMS spec
if tms_scheme:
str_y = "%s" % ((2**z-1) - y)
else:
str_y = "%s" % y
tile_uri = tile_dir + zoom + '/' + str_x + '/' + str_y + '.png'
# Submit tile to be rendered into the queue
t = (name, tile_uri, x, y, z)
try:
queue.put(t)
except KeyboardInterrupt:
raise SystemExit("Ctrl-c detected, exiting...")
# Signal render threads to exit by sending empty request to queue
for i in range(num_threads):
queue.put(None)
# wait for pending rendering jobs to complete
queue.join()
for i in range(num_threads):
renderers[i].join()
if __name__ == "__main__":
home = os.environ['HOME']
#try:
# mapfile = os.environ['MAPNIK_MAP_FILE']
#except KeyError:
# mapfile = home + "/svn.openstreetmap.org/applications/rendering/mapnik/osm-local.xml"
# TALVIKUUKAUSINA
# mapfile="/home/nissiant/mapnik-style/pkk_osm_style_summer_map_with_winter_paths.xml"
# KESAKUUKAUSINA
#mapfile="/home/nissiant/mapnik-style/pkk_osm_style_summer_map.xml"
mapfile="/home/nissiant/Documents/Mapbox/project/openstreetmap-carto/openstreetmap-carto.xml"
#try:
# tile_dir = os.environ['MAPNIK_TILE_DIR']
#except KeyError:
# tile_dir = home + "/osm/tiles/"
#tile_dir = "/home/nissiant/tiles_tmp/"
tile_dir = "/var/tmp/osm/tiles"
if not tile_dir.endswith('/'):
tile_dir = tile_dir + '/'
#-------------------------------------------------------------------------
#
# Change the following for different bounding boxes and zoom levels
#
# Start with an overview
# World
bbox = (-180.0,-90.0, 180.0,90.0)
#render_tiles(bbox, mapfile, tile_dir, minZoom, maxZoom)
render_tiles(bbox, mapfile, tile_dir, 0, 5, "World")
# etela-suomi zoomi tasoille 6-9
# vasen alakulma 59.7054/20.7305
# oikea ylakulma 62.7816/31.4811
# bbox = (20.7305 , 59.7054 , 31.4811 , 62.7816)
bbox = (20.7305 , 59.7054 , 31.4811 , 68.000)
render_tiles(bbox, mapfile, tile_dir, 6, 9, "etela-Suomi")
# Lantinen suomi tasoilla 10-13
bbox = (21.6462 , 60.5 , 26.1390 , 62.2436)
render_tiles(bbox, mapfile, tile_dir, 10, 13, "Lantinen-Suomi")
# Tampere zoomitasoilla 14-16
bbox = (23.0 , 61 , 24.44 , 61.59293)
render_tiles(bbox, mapfile, tile_dir, 14, 16, "Tampere")
# Ellivuori ja Sastamala 14-16
bbox = (22.8 , 61.2 , 23 , 61.5)
render_tiles(bbox, mapfile, tile_dir, 14, 16, "Ellivuori")
# Nasijarven itapuolelle suorakaide
bbox = (23.7630 , 61.59293 , 24.44 , 61.97)
render_tiles(bbox, mapfile, tile_dir, 10, 16, "Nassy itapuoli")
# Oulun testialue 10-16
bbox = (25.1024 , 64.8437 , 26.1111 , 65.2924)
render_tiles(bbox, mapfile, tile_dir, 10, 16, "Oulu")
# Porvoon testialue 10-16
bbox = (25.3000 , 60.2500 , 26.0000 , 60.5300)
render_tiles(bbox, mapfile, tile_dir, 10, 16, "Porvoo")
# Lahden testialue 10-16
bbox = (25.2987,60.9295,26.1767,61.2389)
render_tiles(bbox, mapfile, tile_dir, 10, 16, "Lahti")
# Evonn testialue 10-16
bbox = (25.00368 , 61.17876 , 25.30402 , 61.37412)
render_tiles(bbox, mapfile, tile_dir, 10, 16, "Lahti")
# Helvetinjarven kansallispuiston alue
bbox = (23.68,61.95,24.79,62.29)
render_tiles(bbox, mapfile, tile_dir, 10, 16, "Helvetinjarvi")
# EI NORMAALISTI LASKETETA
# Rovaniemenn testialue 10-16
bbox = (25.4005 , 66.4042 , 26.1474 , 66.6554)
#render_tiles(bbox, mapfile, tile_dir, 10, 16, "Rovaniemi")
# Pelkka Kaupin alue
bbox = (23.77293 , 61.50659 , 23.93110 , 61.52932)
# render_tiles(bbox, mapfile, tile_dir, 10, 16, "Kauppi")
# Jyvaskyla laajavuoren ymparisto
bbox = (25.57041 , 62.20433 , 25.86229 , 62.31886)
#render_tiles(bbox, mapfile, tile_dir, 10, 17, "Jyvaskyla")