mapchete.formats.default.png module

PNG process output.

output configuration parameters

mandatory

bands: integer

number of output bands to be written

path: string

output directory

optional

nodata: integer or float

nodata value used for writing

class mapchete.formats.default.png.OutputDataReader(output_params, **kwargs)

Bases: TileDirectoryOutputReader

PNG output class.

Parameters

output_paramsdictionary

output parameters from Mapchete file

Attributes

pathstring

path to output directory

file_extensionstring

file extension for output files (.png)

output_paramsdictionary

output parameters from Mapchete file

nodatainteger or float

nodata value used when writing PNGs

pixelbufferinteger

buffer around output tiles

pyramidtilematrix.TilePyramid

output TilePyramid

crsrasterio.crs.CRS

object describing the process coordinate reference system

sridstring

spatial reference ID of CRS (e.g. “{‘init’: ‘epsg:4326’}”)

METADATA = {'data_type': 'raster', 'driver_name': 'PNG', 'mode': 'w'}

empty(process_tile)

Return empty data.

Parameters

process_tileBufferedTile

must be member of process TilePyramid

Returns

empty dataarray

empty array with data type given in output parameters

for_web(data)

Convert data to web output.

Parameters

dataarray

Returns

web dataarray

is_valid_with_config(config)

Check if output format is valid with other process parameters.

Parameters

configdictionary

output configuration parameters

Returns

is_validbool

profile(tile=None)

Create a metadata dictionary for rasterio.

Parameters

tileBufferedTile

Returns

metadatadictionary

output profile dictionary used for rasterio.

read(output_tile, **kwargs)

Read existing process output.

Parameters

output_tileBufferedTile

must be member of output TilePyramid

Returns

process outputBufferedTile with appended data

class mapchete.formats.default.png.OutputDataWriter(output_params, **kwargs)

Bases: OutputDataWriter, OutputDataReader

METADATA = {'data_type': 'raster', 'driver_name': 'PNG', 'mode': 'w'}

write(process_tile, data)

Write data from one or more process tiles.

Parameters

process_tileBufferedTile

must be member of process TilePyramid