72 lines
1.6 KiB
Python
72 lines
1.6 KiB
Python
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# -*- coding: utf-8 -*-
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# imageio is distributed under the terms of the (new) BSD License.
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""" Read GDAL files.
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Backend: `GDAL <https://gdal.org/>`_
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.. note::
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To use this plugin you have to install its backend::
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pip install imageio[gdal]
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Parameters
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----------
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none
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"""
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from ..core import Format, has_module
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_gdal = None # lazily loaded in load_lib()
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def load_lib():
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global _gdal
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try:
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import osgeo.gdal as _gdal
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except ImportError:
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raise ImportError(
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"The GDAL format relies on the GDAL package."
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"Please refer to http://www.gdal.org/"
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"for further instructions."
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)
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return _gdal
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GDAL_FORMATS = (".tiff", " .tif", ".img", ".ecw", ".jpg", ".jpeg")
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class GdalFormat(Format):
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"""See :mod:`imageio.plugins.gdal`"""
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def _can_read(self, request):
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if request.extension in (".ecw",):
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return True
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if has_module("osgeo.gdal"):
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return request.extension in self.extensions
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def _can_write(self, request):
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return False
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# --
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class Reader(Format.Reader):
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def _open(self):
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if not _gdal:
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load_lib()
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self._ds = _gdal.Open(self.request.get_local_filename())
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def _close(self):
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del self._ds
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def _get_length(self):
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return 1
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def _get_data(self, index):
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if index != 0:
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raise IndexError("Gdal file contains only one dataset")
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return self._ds.ReadAsArray(), self._get_meta_data(index)
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def _get_meta_data(self, index):
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return self._ds.GetMetadata()
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