[Talk-ca] Any way to "dirty" large areas of Mapnik?

[G. Michael Carter]

Play with this:

#!/usr/bin/python
from math import pi,cos,sin,log,exp,atan,ceil,floor,radians,tan
from subprocess import call
import sys, os
from Queue import Queue
import mapnik
import threading

def deg2num(lat_deg, lon_deg, zoom):
    lat_rad = radians(lat_deg)
    n = 2.0 ** zoom
    xtile = int((lon_deg + 180.0) / 360.0 * n)
    ytile = int((1.0 - log(tan(lat_rad) + (1 / cos(lat_rad))) / pi) / 
2.0 * n)
    return(xtile, ytile)


def minmax (a,b,c):
     a = max(a,b)
     a = min(a,c)
     return a

def dirty_tiles(bbox):
     for z in range(5,18):
         str_z = "%s" % z
         px0 = deg2num(bbox[1], bbox[0], z)
         px1 = deg2num(bbox[3], bbox[2], z)
         #print px0, px1

         for x in range(int(px0[0]),int(px1[0])+1):
             str_x = "%s" % x
             for y in range(int(px0[1]),int(px1[1])+1):
                 str_y = "%s" % y
                 dirty_uri = 'curl http://b.tile.openstreetmap.org/' + 
str_z + '/' + str_x + '/' + str_y + '.png/dirty; sleep 2;'
                 print dirty_uri


if __name__ == "__main__":
     home = "."
     
#-------------------------------------------------------------------------
     #
     # Change the following for different bounding boxes and zoom levels
     #
     # Start with an overview

#    if  sys.argv[0] is None:
#        print "usage dirty.py: tilename max_lat max_lon min_lat min_lon"
#        exit


     bbox = 
(float(sys.argv[2]),float(sys.argv[3]),float(sys.argv[4]),float(sys.argv[5]))
#    bbox = (-87.0,49.0,-82.0,45.0)
#    bbox = (-81.0,52.0,-70.0,38.0)
     print "#",sys.argv[1],":",bbox

     dirty_tiles(bbox)



On 08/08/10 08:26 PM, Tyler Gunn wrote:
> Is there any easy way to "dirty" large areas of the Mapnik map at all zoom
> levels?  I'm working on the 062N* tiles in Canvec and there's a fair number
> of tiles at different zoom levels that are not properly refreshed:
>
> For example:
> http://www.openstreetmap.org/?lat=51.529&lon=-100.42&zoom=9&layers=M
> http://www.openstreetmap.org/?lat=51.547&lon=-101.033&zoom=10&layers=M
> http://www.openstreetmap.org/?lat=51.564&lon=-101.206&zoom=11&layers=M
>
> Notice that some areas are fine at some zoom levels where the same areas
> are not at other levels.
>
> I am not about to go and do the whole "/dirty" thing on all the tiles that
> are not rendering correctly. :)
>
>
>
>    


-- 
*G. Michael Carter*
Contact: H: 1-519-940-8935 | W: 1-905-267-8494 | M: 1-519-215-1869 | F: 
1-519-941-0009
Google Talk: xmpp:mikeycarter1974 at gmail.com

<http://www.openstreetmap.org/?lat=43.9216&lon=-80.105&zoom=14&layers=B000FTF> 
<http://livedvd.carterfamily.ca/>
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