plandez 2.5.1.dev0

Description:

plandez 2.5.1.dev0

Landez manipulates tiles, builds MBTiles, does tiles compositing and arrange tiles together into single images.
Tiles can either be obtained from a remote tile service URL, from a local Mapnik stylesheet,
a WMS server or from MBTiles files.
For building MBTiles, Landez embeds mbutil from Mapbox https://github.com/mapbox/mbutil at the final stage.
The land covered is specified using a list of bounding boxes and zoom levels.





INSTALL
Landez is pure python and has no external dependency.
sudo easy_install landez
However, it requires mapnik if the tiles are rendered locally.
sudo aptitude install python-mapnik
And PIL to blend tiles together or export arranged tiles into images.
sudo aptitude install python-imaging


USAGE

Building MBTiles files

Remote tiles
Using a remote tile service (OpenStreetMap.org by default):
import logging
from landez import MBTilesBuilder

logging.basicConfig(level=logging.DEBUG)

mb = MBTilesBuilder(cache=False)
mb.add_coverage(bbox=(-180.0, -90.0, 180.0, 90.0),
zoomlevels=[0, 1])
mb.run()
Please respect Tile usage policies <http://wiki.openstreetmap.org/wiki/Tile_usage_policy>


Local rendering
Using mapnik to render tiles:
import logging
from landez import MBTilesBuilder

logging.basicConfig(level=logging.DEBUG)

mb = MBTilesBuilder(stylefile="yourstyle.xml", filepath="dest.mbtiles")
mb.add_coverage(bbox=(-180.0, -90.0, 180.0, 90.0),
zoomlevels=[0, 1])
mb.run()
And with UTFGrids:
import logging
from landez import MBTilesBuilder

logging.basicConfig(level=logging.DEBUG)

mb = MBTilesBuilder(stylefile="yourstyle.xml",
grid_fields=["field1", "field2", "field3", ...] ,
filepath="dest.mbtiles")
mb.add_coverage(bbox=(-180, -90, 180, 90),
zoomlevels=[0, 1, 2, 3])
mb.run()


From an other MBTiles file
import logging
from landez import MBTilesBuilder

logging.basicConfig(level=logging.DEBUG)

mb = MBTilesBuilder(mbtiles_file="yourfile.mbtiles", filepath="dest.mbtiles")
mb.add_coverage(bbox=(-180.0, -90.0, 180.0, 90.0),
zoomlevels=[0, 1])
mb.run()


From a WMS server
mb = MBTilesBuilder(wms_server="http://yourserver.com/geoserver/wms",
wms_layers=["ign:departements"],
wms_options=dict(format="image/png",
transparent=True),
filepath="dest.mbtiles")
mb.add_coverage(bbox=([-0.9853,43.6435.1126,44.0639]))
mb.run()



Blend tiles together
Merge multiple sources of tiles (URL, WMS, MBTiles, Mapnik stylesheet) together. (requires python PIL)
For example, build a new MBTiles by blending tiles of a MBTiles on top of OpenStreetMap tiles :
mb = MBTilesBuilder(filepath="merged.mbtiles")
overlay = TilesManager(mbtiles_file="carto.mbtiles")
mb.add_layer(overlay)
mb.run()
Or composite a WMS layer with OpenStreetMap using transparency (40%):
mb = MBTilesBuilder(wms_server="http://yourserver.com/geoserver/wms",
wms_layers=["img:orthophoto"])
overlay = TilesManager(remote=True)
mb.add_layer(overlay, 0.4)
mb.run()


Export Images
Assemble and arrange tiles together into a single image. (requires python PIL)
Specify tiles sources in the exact same way as for building MBTiles files.
import logging
from landez import ImageExporter

logging.basicConfig(level=logging.DEBUG)

ie = ImageExporter(mbtiles_file="yourfile.mbtiles")
ie.export_image(bbox=(-180.0, -90.0, 180.0, 90.0), zoomlevel=3, imagepath="image.png")


Add post-processing filters
Convert map tiles to gray scale, more suitable for information overlay :
from landez.filters import GrayScale

ie = ImageExporter()
ie.add_filter(GrayScale())
Replace a specific color by transparent pixels (i.e. color to alpha, a-la-Gimp) :
from landez.filters import ColorToAlpha

overlay = TileManager()
overlay.add_filter(ColorToAlpha('#ffffff')) # white will be transparent

ie = ImageExporter()
ie.add_layer(overlay)
...


Extract MBTiles content
from landez.sources import MBTilesReader

mbreader = MBTilesReader("yourfile.mbtiles")

# Metadata
print mbreader.metadata()

# Zoom levels
print mbreader.zoomlevels()

# Image tile
with open('tile.png', 'wb') as out:
out.write(mbreader.tile(z, x, y))

# UTF-Grid tile
print mbreader.grid(z, x, y, 'callback')


Manipulate tiles
from landez import MBTilesBuilder

# From a TMS tile server
# tm = TilesManager(tiles_url="http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png")

# From a MBTiles file
tm = TilesManager(mbtiles_file="yourfile.mbtiles")

tiles = tm.tileslist(bbox=(-180.0, -90.0, 180.0, 90.0),
zoomlevels=[0, 1])
for tile in tiles:
tilecontent = tm.tile(tile) # download, extract or take from cache
...
Cache tiles are stored using TMS scheme by default (with y value flipped). It can be changed to WMTS (a.k.a xyz) :
tm = TilesManager(your_sources_options, cache=True, cache_scheme="wmts")


Run tests
Run tests with nosetests (if you are working in a virtualenv, don’t forget to install nose in it!):
cd landez
nosetests
The Mapnik stylesheet for the test about grid content comes from <https://github.com/springmeyer/gridsforkids>



AUTHORS


Mathieu Leplatre <[email protected]>
Sergej Tatarincev
Éric Bréhault
Waldemar Osuch
Isabelle Vallet
Thanks to mbutil authors <https://github.com/mapbox/mbutil>





LICENSE


Lesser GNU Public License




CHANGELOG

2.5.1.dev0





2.5.0 (2019-04-16)

Add support of Python 3.



2.4.1 (2019-03-13)

Do not try to get tiles again when tiles doesn’t exist.



2.4.0 (2017-03-02)

Do not crash when overlay tile data is not a valid image
Correctly generate metadata for zoom levels
Add support for tms mbtiles
Correct tile box calculation for case when floating point value is an integer
Correctly generate metadata for zoom levels
Use the full path to construct the cache directory, as otherwise different
tiles sets on the same server are considered to be the same one
Added a name metadata to prevent Maptiler crash



2.3.0 (2014-11-18)

Add headers to WMS sources if specified (thanks @sempixel!)



2.2.0 (2014-09-22)

Add delay between tiles downloads retries (by @kiorky)
Add option to ignore errors during MBTiles creation (e.g. download errors)



2.1.1 (2013-08-27)

Do not hard-code grid(); JSONP callback.



2.1.0 (2013-08-27)

Add TMS support (ebrehault)
Add default subdomains argument for TileSource
Add ability to set HTTP headers for tiles
Fix file corruption on Windows (by @osuchw)



2.0.3 (2013-05-03)

Fix Mapnik signature on render()



2.0.2 (2012-06-21)

Prevent the whole image to be converted to grayscale
Explicitly check http status code at tiles download



2.0.1 (2012-05-29)

Fix infinite loop on blending layers



2.0.0 (2012-05-25)

Rework cache mechanism
Jpeg tiles support (#14)
Remove use of temporary files
Image post-processing (#11)



2.0.0-alpha (2012-05-23)

Refactoring of whole stack



1.8.2 (2012-03-27)

Fix Mapnik rendering



1.8.1 (2012-02-24)

Fix MBTiles cache cleaning



1.8 (2012-02-24)

WMS support
Tiles compositing



1.7 (2012-02-17)

Catch Sqlite exceptions



1.6 (2012-02-08)

UTF-Grid support for MBTiles files



1.5 (2011-12-07)

Subdomain support for tiles servers
Low level tiles manipulation
Use i18n



1.4 (2011-10-17)

Remove extra logging message of mbutil



1.3 (2011-09-23)

Export set of tiles into single image



1.2 (2011-06-21)

Raise exception if no tiles in coverages



1.1 (2012-04-18)

Move internals to landez module
Split projection into separate module



1.0 (2011-04-18)

Initial working version