|
|
|
|
|
|
|
|
|
|
|
""" Read GDAL files. |
|
|
|
|
|
Backend: `GDAL <https://gdal.org/>`_ |
|
|
|
|
|
.. note:: |
|
|
To use this plugin you have to install its backend:: |
|
|
|
|
|
pip install imageio[gdal] |
|
|
|
|
|
Parameters |
|
|
---------- |
|
|
none |
|
|
""" |
|
|
|
|
|
from ..core import Format, has_module |
|
|
|
|
|
_gdal = None |
|
|
|
|
|
|
|
|
def load_lib(): |
|
|
global _gdal |
|
|
try: |
|
|
import osgeo.gdal as _gdal |
|
|
except ImportError: |
|
|
raise ImportError( |
|
|
"The GDAL format relies on the GDAL package." |
|
|
"Please refer to http://www.gdal.org/" |
|
|
"for further instructions." |
|
|
) |
|
|
return _gdal |
|
|
|
|
|
|
|
|
GDAL_FORMATS = (".tiff", " .tif", ".img", ".ecw", ".jpg", ".jpeg") |
|
|
|
|
|
|
|
|
class GdalFormat(Format): |
|
|
"""See :mod:`imageio.plugins.gdal`""" |
|
|
|
|
|
def _can_read(self, request): |
|
|
if request.extension in (".ecw",): |
|
|
return True |
|
|
if has_module("osgeo.gdal"): |
|
|
return request.extension in self.extensions |
|
|
|
|
|
def _can_write(self, request): |
|
|
return False |
|
|
|
|
|
|
|
|
|
|
|
class Reader(Format.Reader): |
|
|
def _open(self): |
|
|
if not _gdal: |
|
|
load_lib() |
|
|
self._ds = _gdal.Open(self.request.get_local_filename()) |
|
|
|
|
|
def _close(self): |
|
|
del self._ds |
|
|
|
|
|
def _get_length(self): |
|
|
return 1 |
|
|
|
|
|
def _get_data(self, index): |
|
|
if index != 0: |
|
|
raise IndexError("Gdal file contains only one dataset") |
|
|
return self._ds.ReadAsArray(), self._get_meta_data(index) |
|
|
|
|
|
def _get_meta_data(self, index): |
|
|
return self._ds.GetMetadata() |
|
|
|
