| |
| |
|
|
| """ 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() |
|
|
