rasterio package

Module contents

Rasterio

class rasterio.Env(session=None, aws_unsigned=False, profile_name=None, session_class=<function Session.aws_or_dummy>, **options)

Bases: object

Abstraction for GDAL and AWS configuration

The GDAL library is stateful: it has a registry of format drivers, an error stack, and dozens of configuration options.

Rasterio’s approach to working with GDAL is to wrap all the state up using a Python context manager (see PEP 343, https://www.python.org/dev/peps/pep-0343/). When the context is entered GDAL drivers are registered, error handlers are configured, and configuration options are set. When the context is exited, drivers are removed from the registry and other configurations are removed.

Example

with rasterio.Env(GDAL_CACHEMAX=512) as env:

# All drivers are registered, GDAL’s raster block cache # size is set to 512MB. # Commence processing… … # End of processing.

# At this point, configuration options are set to their # previous (possible unset) values.

A boto3 session or boto3 session constructor arguments aws_access_key_id, aws_secret_access_key, aws_session_token may be passed to Env’s constructor. In the latter case, a session will be created as soon as needed. AWS credentials are configured for GDAL as needed.

credentialize()

Get credentials and configure GDAL

Note well: this method is a no-op if the GDAL environment already has credentials, unless session is not None.

Returns

Return type

None

classmethod default_options()

Default configuration options

Parameters

None –

Returns

Return type

dict

drivers()

Return a mapping of registered drivers.

classmethod from_defaults(*args, **kwargs)

Create an environment with default config options

Parameters

  • args (optional) – Positional arguments for Env()

  • kwargs (optional) – Keyword arguments for Env()

Returns

Return type

Env

Notes

The items in kwargs will be overlaid on the default values.

rasterio.band(ds, bidx)

A dataset and one or more of its bands

Parameters

  • ds (dataset object) – An opened rasterio dataset object.

  • bidx (int or sequence of ints) – Band number(s), index starting at 1.

Returns

Return type

rasterio.Band

rasterio.open(fp, mode='r', driver=None, width=None, height=None, count=None, crs=None, transform=None, dtype=None, nodata=None, sharing=False, **kwargs)

Open a dataset for reading or writing.

The dataset may be located in a local file, in a resource located by a URL, or contained within a stream of bytes.

In read (‘r’) or read/write (‘r+’) mode, no keyword arguments are required: these attributes are supplied by the opened dataset.

In write (‘w’ or ‘w+’) mode, the driver, width, height, count, and dtype keywords are strictly required.

Parameters

  • fp (str, file object or pathlib.Path object) – A filename or URL, a file object opened in binary (‘rb’) mode, or a Path object.

  • mode (str, optional) – ‘r’ (read, the default), ‘r+’ (read/write), ‘w’ (write), or ‘w+’ (write/read).

  • driver (str, optional) – A short format driver name (e.g. “GTiff” or “JPEG”) or a list of such names (see GDAL docs at http://www.gdal.org/formats_list.html). In ‘w’ or ‘w+’ modes a single name is required. In ‘r’ or ‘r+’ modes the driver can usually be omitted. Registered drivers will be tried sequentially until a match is found. When multiple drivers are available for a format such as JPEG2000, one of them can be selected by using this keyword argument.

  • width (int, optional) – The number of columns of the raster dataset. Required in ‘w’ or ‘w+’ modes, it is ignored in ‘r’ or ‘r+’ modes.

  • height (int, optional) – The number of rows of the raster dataset. Required in ‘w’ or ‘w+’ modes, it is ignored in ‘r’ or ‘r+’ modes.

  • count (int, optional) – The count of dataset bands. Required in ‘w’ or ‘w+’ modes, it is ignored in ‘r’ or ‘r+’ modes.

  • crs (str, dict, or CRS; optional) – The coordinate reference system. Required in ‘w’ or ‘w+’ modes, it is ignored in ‘r’ or ‘r+’ modes.

  • transform (Affine instance, optional) – Affine transformation mapping the pixel space to geographic space. Required in ‘w’ or ‘w+’ modes, it is ignored in ‘r’ or ‘r+’ modes.

  • dtype (str or numpy dtype) – The data type for bands. For example: ‘uint8’ or rasterio.uint16. Required in ‘w’ or ‘w+’ modes, it is ignored in ‘r’ or ‘r+’ modes.

  • nodata (int, float, or nan; optional) – Defines the pixel value to be interpreted as not valid data. Required in ‘w’ or ‘w+’ modes, it is ignored in ‘r’ or ‘r+’ modes.

  • sharing (bool; optional) – To reduce overhead and prevent programs from running out of file descriptors, rasterio maintains a pool of shared low level dataset handles. When True this function will use a shared handle if one is available. Multithreaded programs must avoid sharing and should set sharing to False.

  • kwargs (optional) – These are passed to format drivers as directives for creating or interpreting datasets. For example: in ‘w’ or ‘w+’ modes a tiled=True keyword argument will direct the GeoTIFF format driver to create a tiled, rather than striped, TIFF.

Returns

Return type

A DatasetReader or DatasetWriter object.

Examples

To open a GeoTIFF for reading using standard driver discovery and no directives:

>>> import rasterio
>>> with rasterio.open('example.tif') as dataset:
...     print(dataset.profile)

To open a JPEG2000 using only the JP2OpenJPEG driver:

>>> with rasterio.open(
...         'example.jp2', driver='JP2OpenJPEG') as dataset:
...     print(dataset.profile)

To create a new 8-band, 16-bit unsigned, tiled, and LZW-compressed GeoTIFF with a global extent and 0.5 degree resolution:

>>> from rasterio.transform import from_origin
>>> with rasterio.open(
...         'example.tif', 'w', driver='GTiff', dtype='uint16',
...         width=720, height=360, count=8, crs='EPSG:4326',
...         transform=from_origin(-180.0, 90.0, 0.5, 0.5),
...         nodata=0, tiled=True, compress='lzw') as dataset:
...     dataset.write(...)
rasterio.pad(array, transform, pad_width, mode=None, **kwargs)

pad array and adjust affine transform matrix.

Parameters

  • array (ndarray) – Numpy ndarray, for best results a 2D array

  • transform (Affine transform) – transform object mapping pixel space to coordinates

  • pad_width (int) – number of pixels to pad array on all four

  • mode (str or function) – define the method for determining padded values

Returns

(array, transform) – Tuple of new array and affine transform

Return type

tuple

Notes

See numpy docs for details on mode and other kwargs: http://docs.scipy.org/doc/numpy-1.10.0/reference/generated/numpy.pad.html