mapproxy.core.grid

Module grid

Classes

[hide private]

NoTiles

TileGrid
This class represents a regular tile grid.

MetaGrid
This class contains methods to calculate bbox, etc.

Functions

[hide private]

float

get_resolution(bbox, size)
Calculate the highest resolution needed to draw the bbox into an image with given size.

source code

tile_grid_for_epsg(epsg, bbox=None, tile_size=(256, 256), res=None)
Create a tile grid that matches the given epsg code: source code

_create_tile_list(xs, ys, level, grid_size)
Returns an iterator tile_coords for the given tile ranges (xs and ys). source code

is_float(x)

source code

pyramid_res_level(initial_res, factor=2.0, levels=20)
Return resolutions of an image pyramid.

source code

bbox_intersects(one, two)

source code

bbox_contains(one, two)

source code

Variables

[hide private]

log = logging.getLogger(__name__)

geodetic_epsg_codes = [4326]

RES_TYPE_SQRT2 = 'sqrt2'

RES_TYPE_GLOBAL = 'global'

RES_TYPE_CUSTOM = 'custom'

Function Details

[hide private]

get_resolution(bbox, size)

source code

Calculate the highest resolution needed to draw the bbox into an image with given size.

>>> get_resolution((-180,-90,180,90), (256, 256))
0.703125

Returns: float: the resolution

tile_grid_for_epsg(epsg, bbox=None, tile_size=`(`256`,` 256`)`, res=None)

source code

Create a tile grid that matches the given epsg code:

Parameters:

epsg ('EPSG:0000', '0000' or 0000) - the epsg code
bbox - the bbox of the grid
tile_size - the size of each tile
res - a list with all resolutions

_create_tile_list(xs, ys, level, grid_size)

source code

Returns an iterator tile_coords for the given tile ranges (xs and ys). If the one tile_coord is negative or out of the grid_size bound, the coord is None.

pyramid_res_level(initial_res, factor=2.0, levels=20)

source code

Return resolutions of an image pyramid.

>>> pyramid_res_level(10000, levels=5)
[10000.0, 5000.0, 2500.0, 1250.0, 625.0]
>>> pyramid_res_level(10000, factor=1/0.75, levels=5)
[10000.0, 7500.0, 5625.0, 4218.7500000000009, 3164.0625000000005]

Parameters:

initial_res - the resolution of the top level (0)
factor - the factor between each level, for tms access 2
levels - number of resolutions to generate

Module grid

get_resolution(bbox, size)

tile_grid_for_epsg(epsg, bbox=None, tile_size=(256, 256), res=None)

_create_tile_list(xs, ys, level, grid_size)

pyramid_res_level(initial_res, factor=2.0, levels=20)

tile_grid_for_epsg(epsg, bbox=None, tile_size=`(`256`,` 256`)`, res=None)