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ilokhat / wms_grid_gen

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This is a small python script to generate grids of images from a WMS server. You must modify cfg.py with your own parameters, they are self-explicit :

  • url for the server
  • your selection of layers

Then launch the script with the correct parameters (as seen below).

Coordinates are specified in Lambert93.

Please note that it's very crude, with no error checks..

(Optionaly you could specify a wmts server and some levels of zoom if you want wmts tiles.)

Requirements

  • Python 3
  • OWSLib
  • pyproj

Usage

$ python gen_tiles_wms.py --help
usage: gen_tiles_wms.py [-h] [-s SIZE] [-x XL93] [-y YL93] [-n NBTILES] [-f FORMAT] [-d DELTA] [-o OUTPUT_DIR] [--centered] [--wmts]

Generate images in a grid fashion from a wms server (or tiles from wmts)

optional arguments:
  -h, --help            show this help message and exit
  -s SIZE, --size SIZE  image size in pixels (default=512)
  -x XL93, --xl93 XL93  lower left x L93 (default=498465.5 )
  -y YL93, --yl93 YL93  lower left y L93 (default=6601459.5)
  -n NBTILES, --nbtiles NBTILES
                        nb of tiles per line and column (square grid, default=1)
  -f FORMAT, --format FORMAT
                        format of images, 'jpeg', 'png' or 'geotiff' (default='jpeg')
  -d DELTA, --delta DELTA
                        length of one square tile side (meters, default=3000)
  -o OUTPUT_DIR, --output_dir OUTPUT_DIR
                        output directory for images (default=.)
  --centered            generate wms tiles centered around x, y for zoom level(s) and layer in config file. discard all other options except -o and -s
  --wmts                generate wmts tiles for zoom level(s) and layer in config file. discard all other options except -x -y and -o
  --wld                 creates .wld file to georeference each tile (for wms only)

Grid

Examples

Getting images from a WMS server, defined by a 3x3 grid, its lower left coordinate, and a (default) 3000 m length for each tile's side for a list of layers defined in cfg.py.

$ python gen_tiles_wms.py -x 649257.2 -y 6858461.9 -n 3 -o out 
1/9
out/scan50_1.jpg written
out/etatmajor_1.jpg written
out/cassini_1.jpg written
out/ortho_1.jpg written
2/9
out/scan50_2.jpg written
out/etatmajor_2.jpg written
out/cassini_2.jpg written
out/ortho_2.jpg written
3/9
out/scan50_3.jpg written
out/etatmajor_3.jpg written
out/cassini_3.jpg written
out/ortho_3.jpg written
4/9
out/scan50_4.jpg written
out/etatmajor_4.jpg written
out/cassini_4.jpg written
out/ortho_4.jpg written
5/9
out/scan50_5.jpg written
out/etatmajor_5.jpg written
out/cassini_5.jpg written
out/ortho_5.jpg written
6/9
out/scan50_6.jpg written
out/etatmajor_6.jpg written
out/cassini_6.jpg written
out/ortho_6.jpg written
7/9
out/scan50_7.jpg written
out/etatmajor_7.jpg written
out/cassini_7.jpg written
out/ortho_7.jpg written
8/9
out/scan50_8.jpg written
out/etatmajor_8.jpg written
out/cassini_8.jpg written
out/ortho_8.jpg written
9/9
out/scan50_9.jpg written
out/etatmajor_9.jpg written
out/cassini_9.jpg written
out/ortho_9.jpg written

The WMS server and the layers to get is set in the relevant section of cfg.py and should look like :

# layers auxquels on peut acceder
LAYERS = ['HR.ORTHOIMAGERY.ORTHOPHOTOS', 'GEOGRAPHICALGRIDSYSTEMS.ETATMAJOR40', 'GEOGRAPHICALGRIDSYSTEMS.CASSINI',
 'GEOGRAPHICALGRIDSYSTEMS.PLANIGNV2', 'GEOGRAPHICALGRIDSYSTEMS.MAPS.SCAN50.1950', 'ORTHOIMAGERY.ORTHOPHOTOS.1950-1965',
 'GEOGRAPHICALGRIDSYSTEMS.MAPS.SCAN-EXPRESS.STANDARD', 'GEOGRAPHICALGRIDSYSTEMS.MAPS', ]

#################################################################################################################
# WMS config
#################################################################################################################
WMS_SERVER = 'https://wxs.ign.fr/xxx_key_xxx/geoportail/r/wms'

# selection des layers parmi ceux definis au dessus par indice, et préfixe utilisé dans le nom des images générées
WMS_SELECTION = {4: 'scan50', 1:'etatmajor', 2:'cassini', 0:'ortho'}

Getting 256x256 images from a WMS server, containing each coordinate and the levels of zoom for each layer set in cfg.py.

$ python gen_tiles_wms.py -o out_wms_centered --centered -s 256
out_wms_centered/c0_classic_zl_8.jpg written
out_wms_centered/c0_scan50_zl_8.jpg written
out_wms_centered/c0_classic_zl_9.jpg written
out_wms_centered/c0_scan50_zl_9.jpg written
out_wms_centered/c0_classic_zl_10.jpg written
out_wms_centered/c0_scan50_zl_10.jpg written
out_wms_centered/c1_classic_zl_8.jpg written
out_wms_centered/c1_scan50_zl_8.jpg written
out_wms_centered/c1_classic_zl_9.jpg written
out_wms_centered/c1_scan50_zl_9.jpg written
out_wms_centered/c1_classic_zl_10.jpg written
out_wms_centered/c1_scan50_zl_10.jpg written
out_wms_centered/c2_classic_zl_8.jpg written
out_wms_centered/c2_scan50_zl_8.jpg written
out_wms_centered/c2_classic_zl_9.jpg written
out_wms_centered/c2_scan50_zl_9.jpg written
out_wms_centered/c2_classic_zl_10.jpg written
out_wms_centered/c2_scan50_zl_10.jpg written

The WMS server, layers to get, zoom levels, and the coordinates are set in the relevant section of cfg.py and should look like :

# layers auxquels on peut acceder
LAYERS = ['HR.ORTHOIMAGERY.ORTHOPHOTOS', 'GEOGRAPHICALGRIDSYSTEMS.ETATMAJOR40', 'GEOGRAPHICALGRIDSYSTEMS.CASSINI',
 'GEOGRAPHICALGRIDSYSTEMS.PLANIGNV2', 'GEOGRAPHICALGRIDSYSTEMS.MAPS.SCAN50.1950', 'ORTHOIMAGERY.ORTHOPHOTOS.1950-1965',
 'GEOGRAPHICALGRIDSYSTEMS.MAPS.SCAN-EXPRESS.STANDARD', 'GEOGRAPHICALGRIDSYSTEMS.MAPS', ]

#################################################################################################################
# WMS config
#################################################################################################################
WMS_SERVER = 'https://wxs.ign.fr/xxx_key_xxx/geoportail/r/wms'

# selection des layers parmi ceux definis au dessus par indice, et préfixe utilisé dans le nom des images générées
WMS_SELECTION = {7: 'classic', 4: 'scan50'}
# ...
# ...
# ...

COORDS = [(923115.73, 6321563.12), (659972.58, 7087925.63), (357197.12, 6684541.92)]
# MAX = 18
WMTS_LEVELS = [8, 9, 10]

Getting tiles from a WMTS server, containing each coordinate and for the levels of zoom set in cfg.py for the layer specified.

$ python gen_tiles_wms.py -o out_wmts --wmts
out_wmts/c0_classic_zl_10.jpg written
out_wmts/c0_classic_zl_11.jpg written
out_wmts/c0_classic_zl_12.jpg written
out_wmts/c1_classic_zl_10.jpg written
out_wmts/c1_classic_zl_11.jpg written
out_wmts/c1_classic_zl_12.jpg written
out_wmts/c2_classic_zl_10.jpg written
out_wmts/c2_classic_zl_11.jpg written
out_wmts/c2_classic_zl_12.jpg written

The relevant section of cfg.py should look like this :

# layers auxquels on peut acceder
LAYERS = ['HR.ORTHOIMAGERY.ORTHOPHOTOS', 'GEOGRAPHICALGRIDSYSTEMS.ETATMAJOR40', 'GEOGRAPHICALGRIDSYSTEMS.CASSINI',
 'GEOGRAPHICALGRIDSYSTEMS.PLANIGNV2', 'GEOGRAPHICALGRIDSYSTEMS.MAPS.SCAN50.1950', 'ORTHOIMAGERY.ORTHOPHOTOS.1950-1965',
 'GEOGRAPHICALGRIDSYSTEMS.MAPS.SCAN-EXPRESS.STANDARD', 'GEOGRAPHICALGRIDSYSTEMS.MAPS', ]
 # ...
 # ...
 # ...
 
#################################################################################################################
# WMTS config
#################################################################################################################
WMTS_SERVER = "http://wxs.ign.fr/xxx_key_xxx/geoportail/wmts?SERVICE=WMTS&REQUEST=GetCapabilities"
# index dans LAYERS et prefixe à utiliser 
WMTS_LAYER = {'idx': 7, 'prefix': 'classic'}


#################################################################################################################
# if --wmts or --centered option is set, it will get all tiles containing (resp. centered around)
# each coordinate in COORDS for all zoom levels in WMTS_LEVELS
#################################################################################################################
COORDS = [(923115.73, 6321563.12), (659972.58, 7087925.63), (357197.12, 6684541.92)]
# MAX = 18
WMTS_LEVELS = [10, 11, 12]

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