class TileStacheProvider(object):
"""An object suitable for use as a TileStache provider.
.. py:attribute:: renderer
Set this attribute to a renderer instance to use for rendering map tiles.
"""
def __init__(self, layer):
super(TileStacheProvider, self).__init__()
self.renderer = TileFetcher()
def renderArea(self, width, height, srs, xmin, ymin, xmax, ymax, zoom):
spatial_reference = SpatialReference()
# this is a special HACK to take account of the fact that the proj4 srs provided by TileStache has the +over
# parameter and OGR thinks it is different to EPSG:3857
if srs == TileStache.Geography.SphericalMercator.srs:
spatial_reference.ImportFromEPSG(3857)
else:
spatial_reference.ImportFromProj4(srs)
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, width, height)
cr = cairo.Context(surface)
set_geo_transform(cr, xmin, xmax, ymax, ymin, width, height)
self.renderer.render_callable(cr, spatial_reference=spatial_reference)()
im = Image.frombuffer('RGBA', (width, height), surface.get_data(), 'raw', 'BGRA', 0, 1)
return im
def run(args):
srs = SpatialReference()
if args.epsg is not None:
srs.ImportFromEPSG(args.epsg)
elif args.proj is not None:
srs.ImportFromProj4(args.proj)
else:
srs.ImportFromEPSG(4326) # default to WGS84 lat/lng
left, right, top, bottom = (
args.left*args.units,
args.right*args.units,
args.top*args.units,
args.bottom*args.units
)
if args.width is None and args.height is None:
print('error: at least one of height or width must be set')
sys.exit(1)
elif args.height is None:
ew, eh = (abs(right-left), abs(top-bottom))
args.height = max(1, int(args.width * eh / ew))
elif args.width is None:
ew, eh = (abs(right-left), abs(top-bottom))
args.width = max(1, int(args.height * ew / eh))
size = (args.width, args.height)
url_patterns = {
'osm': 'http://otile1.mqcdn.com/tiles/1.0.0/osm/{zoom}/{x}/{y}.jpg',
'aerial': 'http://oatile1.mqcdn.com/tiles/1.0.0/sat/{zoom}/{x}/{y}.jpg',
}
def url_fetcher(url):
http = httplib2.Http(args.cache_dir)
rep, content = http.request(url, 'GET')
if rep.status != 200:
raise foldbeam.renderer.URLFetchError(str(rep.status) + ' ' + rep.reason)
return content
renderer = TileFetcher(
url_pattern=url_patterns['aerial' if args.aerial else 'osm'],
url_fetcher=url_fetcher)
output_surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, size[0], size[1])
context = cairo.Context(output_surface)
set_geo_transform(context, left, right, top, bottom, size[0], size[1])
renderer.render_callable(context, spatial_reference=srs)()
output_surface.write_to_png(args.output)
def __init__(self, layer):
super(TileStacheProvider, self).__init__()
self.renderer = TileFetcher()
def run(args):
srs = SpatialReference()
srs.ImportFromEPSG(4326) # default to WGS84 lat/lng
if args.like_filename is not None:
like_ds = gdal.Open(args.like_filename)
ox, sx, _, oy, _, sy = like_ds.GetGeoTransform()
args.width = like_ds.RasterXSize
args.height = like_ds.RasterYSize
args.left = ox
args.right = ox + sx * args.width
args.top = oy
args.bottom = oy + sy * args.height
args.units = 1
# FIXME: projection
elif args.cx is not None and args.cy is not None and args.ex is not None and args.ey is not None:
args.left = args.cx - args.ex * 0.5
args.right = args.cx + args.ex * 0.5
args.top = args.cy + args.ey * 0.5
args.bottom = args.cy - args.ey * 0.5
elif args.left is None or args.right is None or args.top is None or args.bottom is None:
print('error: all of left, right, top and bottom extent must be specified')
if args.epsg is not None:
srs.ImportFromEPSG(args.epsg)
elif args.proj is not None:
srs.ImportFromProj4(args.proj)
left, right, top, bottom = (
args.left*args.units,
args.right*args.units,
args.top*args.units,
args.bottom*args.units
)
if args.width is None and args.height is None:
print('error: at least one of height or width must be set')
sys.exit(1)
elif args.height is None:
ew, eh = (abs(right-left), abs(top-bottom))
args.height = max(1, int(args.width * eh / ew))
elif args.width is None:
ew, eh = (abs(right-left), abs(top-bottom))
args.width = max(1, int(args.height * ew / eh))
size = (args.width, args.height)
url_patterns = {
'osm': 'http://otile1.mqcdn.com/tiles/1.0.0/osm/{zoom}/{x}/{y}.jpg',
'aerial': 'http://ecn.t1.tiles.virtualearth.net/tiles/a{quadkey}.jpeg?g=1647',
#'aerial': 'http://oatile1.mqcdn.com/tiles/1.0.0/sat/{zoom}/{x}/{y}.jpg',
}
def url_fetcher(url):
http = httplib2.Http(args.cache_dir)
rep, content = http.request(url, 'GET')
if rep.status != 200:
raise foldbeam.renderer.URLFetchError(str(rep.status) + ' ' + rep.reason)
return content
renderer = TileFetcher(
url_pattern=url_patterns['aerial' if args.aerial else 'osm'],
url_fetcher=url_fetcher)
if args.output.endswith('.tiff'):
import numpy as np
image_data = np.zeros((size[1], size[0], 4), dtype=np.uint8)
output_surface = cairo.ImageSurface.create_for_data(
image_data, cairo.FORMAT_ARGB32, size[0], size[1])
context = cairo.Context(output_surface)
set_geo_transform(context, left, right, top, bottom, size[0], size[1])
renderer.render_callable(context, spatial_reference=srs)()
ds = gdal_array.OpenArray(
np.transpose(image_data[:,:,[2,1,0,3]], (2,0,1)))
ds.SetGeoTransform((
left, (right - left) / size[0], 0,
top, 0, (bottom - top) / size[1]
))
drv = gdal.GetDriverByName('GTiff')
drv.Delete(args.output)
drv.CreateCopy(args.output, ds, options=('COMPRESS=LZW',))
else:
output_surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, size[0], size[1])
context = cairo.Context(output_surface)
set_geo_transform(context, left, right, top, bottom, size[0], size[1])
renderer.render_callable(context, spatial_reference=srs)()
output_surface.write_to_png(args.output)
