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newslippy.py
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"""
Create Slippymaps from numpy arrays
Reference:
http://wiki.openstreetmap.org/wiki/Slippy_map_tilenames
"""
import os
import fnmatch
import urllib
import zipfile
import numpy as np
import pylab as pl
from scipy.spatial import cKDTree
from paramiko import SSHClient, SSHConfig
from scp import SCPClient
class TileArray(object):
"""Class to generate off-line slippy tiles from zoomable maps"""
def __init__(self, llon, llat, **kwargs):
"""Setup the class instance"""
for key in ['maxzoom','lon1','lon2', 'lat1', 'lat2',
'cmin', 'cmax', 'cmap']:
if not key in kwargs.keys():
self.__dict__[key] = None
else:
self.__dict__[key] = kwargs[key]
if self.lat1 is None:
self.lat1 = max([llat.min(), -85.0511])
else:
self.lat1 = max([self.lat1, -85.0511])
if self.lat2 is None:
self.lat2 = min([llat.max(), 85.0511])
else:
self.lat2 = min([self.lat2, 85.0511])
if self.lon1 is None:
self.lon1 = llon.min()
else:
self.lon1 = self.lon1
if self.lon2 is None:
self.lon2 = llat.max()
else:
self.lon2 = self.lon2
self.llmask = ((llon>=self.lon1) & (llon<=self.lon2) &
(llat>=self.lat1) & (llat<=self.lat2))
self.lonvec = llon[self.llmask].astype(np.float32)
self.latvec = llat[self.llmask].astype(np.float32)
self.zoom = 0
def __setattr__(self, name, value):
"""Overload __setitem__ to change zoom level."""
self.__dict__[name] = value
if name == "zoom":
self.set_zoom(value)
def set_zoom(self, zoom):
self.__dict__['zoom'] = zoom
self.numtiles = 2**zoom
self.create_ijmats()
#self.create_llmats()
def create_ijmats(self):
"""Create arrays defining tiles at a given zoom level"""
self.xtile1,self.ytile2 = np.floor(self.deg2num(self.lon1, self.lat1))
self.xtile2,self.ytile1 = np.floor(self.deg2num(self.lon2, self.lat2))
self.xnumtiles = self.xtile2 - self.xtile1 + 1
self.ynumtiles = self.ytile2 - self.ytile1 + 1
self.xtilevec = np.linspace(self.xtile1, self.xtile2+1,
256*self.xnumtiles,
endpoint=False).astype(np.float32)
self.ytilevec = np.linspace(self.ytile1, self.ytile2+1,
256*self.ynumtiles,
endpoint=False).astype(np.float32)
self.xtilemat,self.ytilemat = np.meshgrid(self.xtilevec,
self.ytilevec,
copy=False)
self.ivec = np.arange(256*self.xnumtiles, dtype=np.int32)
self.jvec = np.arange(256*self.ynumtiles, dtype=np.int32)
self.imat,self.jmat = np.meshgrid(self.ivec,self.jvec,
copy=False)
self.itilemat = self.xtilemat.astype(np.uint16)
self.jtilemat = self.ytilemat.astype(np.uint16)
def create_llmats(self):
"""Create arrays with lon-lats for tile cells"""
dx = self.xtilevec[1] - self.xtilevec[0]
dy = self.ytilevec[1] - self.ytilevec[0]
self.nwlon,self.nwlat = self.num2deg(self.xtilemat, self.ytilemat)
self.selon,self.selat = self.num2deg(self.xtilemat+dx,
self.ytilemat+dy)
self.clon = (self.nwlon + self.selon)/2
self.clat = (self.nwlat + self.selat)/2
def add_kd(self, coord="tile",mask=None):
"""Generate a KD-tree object for current njord instance"""
if coord == "grid":
if mask is None: mask = self.lonvec == self.lonvec
xvec = self.kdivec = self.lonvec[np.ravel(mask)]
yvec = self.kdjvec = self.latvec[np.ravel(mask)]
else:
xvec = self.kdlonvec = np.ravel(self.clon)
yvec = self.kdlatvec = np.ravel(self.clat)
self.kd = cKDTree(list(np.vstack((xvec, yvec)).T))
#self.kdijvec = np.vstack((np.ravel(self.imat),
# np.ravel(self.jmat))).T
def reproject(self, fld, zoom=None):
"""Reproject a lat-lon vector to i-j grid coordinates"""
if zoom is not None: self.zoom = zoom
fldvec = fld[self.llmask].astype(np.float32)
tilefld = self.xtilemat * np.nan
llivec,lljvec = self.deg2num(self.lonvec, self.latvec)
mask = ((self.xtilemat >= llivec.min()) &
(self.xtilemat <= llivec.max()) &
(self.ytilemat >= lljvec.min()) &
(self.ytilemat <= lljvec.max()))
kd = cKDTree(np.vstack((llivec, lljvec)).T)
dist,ij = kd.query(np.vstack((self.xtilemat[mask],
self.ytilemat[mask])).T,3)
weights = 1- dist / np.nansum(dist,axis=1)[:,np.newaxis]
tilefld[mask] = np.nansum(fldvec[ij] * weights, axis=1)
return tilefld
self.add_kd('tile')
dist,ij = self.kd.query(self.zip(self.lonvec[mask],
self.latvec[mask]), 1)
tilesums = np.bincount(ij, np.ravel(fld)[mask])
tilecnts = np.bincount(ij)
mask = tilecnts > 0
tiles.flat[mask] = (tilesums.astype(np.float)/tilecnts)[mask]
tiles[self.selat<self.lat1] = np.nan
tiles[self.nwlat>self.lat2] = np.nan
tiles[self.selon<self.lon1] = np.nan
tiles[self.nwlon>self.lon2] = np.nan
return tiles
def save(self, fld, name, webdir="./tiles", maxzoom=8, zip=False, scp=False):
pardir = "%s/%s" % (webdir, name)
self.safemakedirs(pardir)
cmin = self.cmin if self.cmin is not None else np.nanmin(fld)
cmax = self.cmax if self.cmax is not None else np.nanmax(fld)
if self.maxzoom is not None: maxzoom = self.maxzoom
for zm in np.arange(maxzoom+1):
print "Generating zoom level %i" % zm
tiles = self.reproject(fld, zm)
jsh,ish = tiles.shape
for i in np.arange(0,ish-1,256):
for j in np.arange(0,jsh-1,256):
tiledir= ("%s/%i/%i" % (pardir, self.zoom,
self.itilemat[j,i]))
self.safemakedirs(tiledir)
filename = "%s/%i.png" % (tiledir,
self.jtilemat[j,i])
pl.imsave(filename, tiles[j:j+255, i:i+255],
vmin=cmin, vmax=cmax)
print filename
if zip:
self.zipdir(pardir+".zip", pardir, basedir=webdir)
if scp:
self.scp(pardir+".zip", "dimzip")
def zipdir(self,zipfilename, dir, basedir=""):
dir = os.path.abspath(dir)
basedir = os.path.abspath(basedir)
print zipfilename
def find_files(directory, pattern):
for root, dirs, files in os.walk(directory):
for basename in files:
if fnmatch.fnmatch(basename, pattern):
filename = os.path.join(root, basename)
yield filename
with zipfile.ZipFile(zipfilename,'w', zipfile.ZIP_DEFLATED) as zip:
for fn in find_files(dir, "*"):
zip.write(fn, fn.replace(basedir, ''))
def scp(self, filename, remote_path):
config = SSHConfig()
config.parse(open(os.path.expanduser('~/.ssh/config')))
o = config.lookup('geodata')
ssh_client = SSHClient()
ssh_client.load_system_host_keys()
ssh_client.connect(o['hostname'], username=o['user'])
scp = SCPClient(ssh_client.get_transport())
scp.put(filename, remote_path=remote_path)
def ijinterp(self,ivec,jvec, field, mask=None, nei=3, dpos=None):
dist,ij = self.kd.query(list(np.vstack((ivec,jvec)).T), nei)
sumvec = np.nansum(field[self.kdijvec[ij][:,:,1],
self.kdijvec[ij][:,:,0]]*0+1,axis=1)
weights = (1-dist/sumvec[:,np.newaxis])
weights = weights/weights.sum(axis=1)[:,np.newaxis]
fldvec = weights[:,0] * 0
for n in np.arange(nei):
fldvec = fldvec + field[self.kdijvec[ij[:,n]][:,1],
self.kdijvec[ij[:,n]][:,0]] * weights[:,n]
if dpos is not None:
ipos = self.kdijvec[ij[dpos,:], 0]
jpos = self.kdijvec[ij[dpos,:], 1]
return fldvec
def num2deg(self, xtile, ytile):
"""Convert from tile ID to lat-lon """
n = self.numtiles
lon = xtile / n * 360.0 - 180.0
lat_rad = np.arctan(np.sinh(np.pi * (1 - 2 * ytile / n)))
lat = np.degrees(lat_rad)
return (lon, lat)
def deg2num(self, lon, lat):
"""Convert from lat-lon to tile ID"""
lon = np.array(lon)
lat = np.array(lat)
lat_rad = np.radians(lat)
n = self.numtiles
xtile = ((lon + 180.0) / 360.0 * n)
ytile = ((1.0 - np.log(np.tan(lat_rad) +
(1/np.cos(lat_rad))) /
np.pi) / 2.0 * n)
return (xtile, ytile)
def safemakedirs(self,path):
try:
os.makedirs(path)
except OSError:
pass
def create_static_files(self):
py = """
var map = L.map('map').setView([37, -46], 4);
L.tileLayer('http://{s}.tile.cloudmade.com/BC9A493B41014CAABB98F0471D759707/997/256/{z}/{x}/{y}.png', {
maxZoom: %i,
attribution: 'Map data © <a href="http://openstreetmap.org">
OpenStreetMap</a>
contributors, <a href="http://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>,
Imagery (c) <a href="http://cloudmade.com">CloudMade</a>'
}).addTo(map);
L.tileLayer('http://{url}/tiles/{name}/{z}/{x}/{y}.png', {
name: 'test',
url: 'brorfred.org',
}).addTo(map);
"""
def bgtileurl(self, id="BC9A493B41014CAABB98F0471D759707"):
url = "http://tile.cloudmade.com/%s/997/256/" % id
return url
def download_bgtiles(self, webdir="./", maxzoom=8):
"""Download necessary background tiles for local use"""
pardir = "%s/tiles/%s" % (webdir, "background")
self.safemakedirs(pardir)
for zm in np.arange(maxzoom+1):
print "Generating zoom level %i" % zm
for i in np.arange(0,2**zm):
tiledir= ("%s/%i/%i" % (pardir, zm, i))
self.safemakedirs(tiledir)
for j in np.arange(0,2**zm):
url = "%s/%i/%i/%i.png" % (self.bgtileurl(), zm,i,j)
filename = "%s/%i.png" % (tiledir, j)
urllib.urlretrieve(url, filename)
print url
def zip(self, xarr, yarr):
"""
Transform data in a ziplike fashion. NDarrays will be flattened.
Example:
>>> xarr = np.array([1,2,3])
>>> yarr = np.array([5,6,7])
>>> self.zip(xarr, yarr)
array([[1, 5],
[2, 6],
[3, 7]])
"""
return np.vstack((np.ravel(xarr), np.ravel(yarr))).T
def maketiles(name, llon, llat, field, maxzoom=8, **kwargs):
"""Create neccesary files for a slippy map
Creates a hiarchy or folders that contanis 256x256 size png's according
to the slippy standard used by google maps.
Parameters
----------
name : Name of project/basename for folders
llon : Matrix of t-pos longitudes. Same shape as field.
llat : Matrix of t-pos latitudes. Same shape as field.
field : Field to be shown on map
Optional Parameters
-------------------
maxzoom : Max zoom-level of map. 0 is the entire glob. increases by 2**x
lon1 : Cutoff for smallest longitude
lon2 : Cutoff for largest longitude
lat1 : Cutoff for smallest latitude
lat2 : Cutoff for largest latitude
cmin : Lower level for colorbar
cmax : Upper level for colorbar
cmap : Alternative colormap
"""
for key in ['lon1', 'lon2', 'lat1', 'lat2', 'cmin', 'cmax', 'cmap']:
if not key in kwargs.keys():
kwargs[key] = None
tl = TileArray(llon, llat, **kwargs)
tl.save(field, name, maxzoom=maxzoom)