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- decode(file)
- Stub function to decode a TopoJSON file into a list of features.
Not currently implemented, modeled on geojson.decode().
- diff_encode(line, transform)
- Differentially encode a shapely linestring or ring.
- encode(file, features, bounds, is_clipped)
- Encode a list of (WKB, property dict) features into a TopoJSON stream.
Also accept three-element tuples as features: (WKB, property dict, id).
Geometries in the features list are assumed to be unprojected lon, lats.
Bounds are given in geographic coordinates as (xmin, ymin, xmax, ymax).
- get_tiles(names, config, coord)
- Retrieve a list of named TopoJSON layer tiles from a TileStache config.
Check integrity and compatibility of each, looking at known layers,
correct JSON mime-types, "Topology" in the type attributes, and
matching affine transformations.
- get_transform(bounds, size=1024)
- Return a TopoJSON transform dictionary and a point-transforming function.
Size is the tile size in pixels and sets the implicit output resolution.
- merge(file, names, config, coord)
- Retrieve a list of TopoJSON tile responses and merge them into one.
get_tiles() retrieves data and performs basic integrity checks.
- update_arc_indexes(geometry, merged_arcs, old_arcs)
- Updated geometry arc indexes, and add arcs to merged_arcs along the way.
Arguments are modified in-place, and nothing is returned.
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