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Fixing a problem with lost resolution in imshow #1645

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Fixing a problem with lost resolution in imshow #1645

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16 changes: 15 additions & 1 deletion lib/cartopy/mpl/geoaxes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1314,7 +1314,21 @@ def imshow(self, img, *args, **kwargs):
raise ValueError('Expected a projection subclass. Cannot '
'handle a %s in imshow.' % type(transform))

target_extent = self.get_extent(self.projection)
# |target_extent| is the area the image will cover in
# target projection coordinates. This affects the
# resolution of the rescaled image.
if extent is None:
# This assumes it will cover the current visible area.
target_extent = self.get_extent(self.projection)
else:
box = sgeom.box(extent[0], extent[2], extent[1], extent[3])
target_geometry = transform.project_geometry(box,
self.projection)
target_extent = (target_geometry.bounds[0],
target_geometry.bounds[2],
target_geometry.bounds[1],
target_geometry.bounds[3])

regrid_shape = kwargs.pop('regrid_shape', 750)
regrid_shape = self._regrid_shape_aspect(regrid_shape,
target_extent)
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