def test_thumbnail_from_numpy_lookuptable(input_uint8_tif_2: Path):
writer = FileWrite()
outfile = Path(tempfile.gettempdir()) / "test-lookuptable.jpg"
wofs_lookup = {
0: [150, 150, 110], # dry
1: [255, 255, 255], # nodata,
16: [119, 104, 87], # terrain
32: [89, 88, 86], # cloud_shadow
64: [216, 215, 214], # cloud
80: [242, 220, 180], # cloudy terrain
128: [79, 129, 189], # water
160: [51, 82, 119], # shady water
192: [186, 211, 242], # cloudy water
}
with rasterio.open(input_uint8_tif_2) as ds:
input_geobox = GridSpec.from_rio(ds)
data = ds.read(1)
image_bytes = writer.create_thumbnail_singleband_from_numpy(
input_data=data,
input_geobox=input_geobox,
lookup_table=wofs_lookup)
with open(outfile, "wb") as jpeg_file:
jpeg_file.write(image_bytes)
assert_image(outfile, bands=3)
def test_thumbnail_bitflag(input_uint8_tif: Path):
writer = FileWrite()
outfile = Path(tempfile.gettempdir()) / "test-bitflag.jpg"
water = 128
writer.create_thumbnail_singleband(input_uint8_tif, Path(outfile), bit=water)
assert_image(outfile, bands=3)
def test_thumbnail_from_numpy_bitflag(input_uint8_tif: Path):
writer = FileWrite()
outfile = Path(tempfile.gettempdir()) / "test-bitflag.jpg"
water = 128
with rasterio.open(input_uint8_tif) as ds:
input_geobox = GridSpec.from_rio(ds)
data = ds.read(1)
image_bytes = writer.create_thumbnail_singleband_from_numpy(
input_data=data, input_geobox=input_geobox, bit=water)
with open(outfile, "wb") as jpeg_file:
jpeg_file.write(image_bytes)
assert_image(outfile, bands=3)
def write_thumbnail_singleband(
self,
measurement: str,
bit: int = None,
lookup_table: Dict[int, Tuple[int, int, int]] = None,
kind: str = None,
):
"""
Write a singleband thumbnail out, taking in an input measurement and
outputting a JPG with appropriate settings.
Options are to
EITHER
Use a bit (int) as the value to scale from black to white to
i.e., 0 will be BLACK and bit will be WHITE, with a linear scale between.
OR
Provide a lookuptable (dict) of int (key) [R, G, B] (value) fields
to make the image with.
"""
thumb_path = self.names.thumbnail_name(self._work_path, kind=kind)
_, image_path = self.measurements.get(measurement, (None, None))
if image_path is None:
raise IncompleteDatasetError(
ValidationMessage(
Level.error,
"missing_thumb_measurement",
f"Thumbnail measurement is missing: no measurements called {measurement!r}. ",
hint=
f"Available measurements: {', '.join(self.measurements)}",
))
FileWrite().create_thumbnail_singleband(
image_path,
thumb_path,
bit,
lookup_table,
)
self._document_thumbnail(thumb_path, kind)
def test_thumbnail_lookuptable(input_uint8_tif_2: Path):
writer = FileWrite()
outfile = Path(tempfile.gettempdir()) / "test-lookuptable.jpg"
wofs_lookup = {
0: [150, 150, 110], # dry
1: [255, 255, 255], # nodata,
16: [119, 104, 87], # terrain
32: [89, 88, 86], # cloud_shadow
64: [216, 215, 214], # cloud
80: [242, 220, 180], # cloudy terrain
128: [79, 129, 189], # water
160: [51, 82, 119], # shady water
192: [186, 211, 242], # cloudy water
}
writer.create_thumbnail_singleband(input_uint8_tif_2,
Path(outfile),
lookup_table=wofs_lookup)
assert_image(outfile, bands=3)
def write_thumbnail(
self,
red: str,
green: str,
blue: str,
resampling: Resampling = Resampling.average,
static_stretch: Tuple[int, int] = None,
percentile_stretch: Tuple[int, int] = (2, 98),
scale_factor: int = 10,
kind: str = None,
):
"""
Write a thumbnail for the dataset using the given measurements (specified by name) as r/g/b.
(the measurements must already have been written.)
A linear stretch is performed on the colour. By default this is a dynamic 2% stretch
(the 2% and 98% percentile values of the input). The static_stretch parameter will
override this with a static range of values.
:param red: Name of measurement to put in red band
:param green: Name of measurement to put in green band
:param blue: Name of measurement to put in blue band
:param kind: If you have multiple thumbnails, you can specify the 'kind' name to distinguish
them (it will be put in the filename).
Eg. GA's ARD has two thumbnails, one of kind ``nbar`` and one of ``nbart``.
:param scale_factor: How many multiples smaller to make the thumbnail.
:param percentile_stretch: Upper/lower percentiles to stretch by
:param resampling: rasterio :class:`rasterio.enums.Resampling` method to use.
:param static_stretch: Use a static upper/lower value to stretch by instead of dynamic stretch.
"""
thumb_path = self.names.thumbnail_name(self._work_path, kind=kind)
measurements = dict(
(name, (grid, path)) for grid, name, path in self._measurements.iter_paths()
)
missing_measurements = {red, green, blue} - set(measurements)
if missing_measurements:
raise IncompleteDatasetError(
ValidationMessage(
Level.error,
"missing_thumb_measurements",
f"Thumbnail measurements are missing: no measurements called {missing_measurements!r}. ",
hint=f"Available measurements: {', '.join(measurements)}",
)
)
rgbs = [measurements[b] for b in (red, green, blue)]
unique_grids: List[GridSpec] = list(set(grid for grid, path in rgbs))
if len(unique_grids) != 1:
raise NotImplementedError(
"Thumbnails can only currently be created from measurements of the same grid spec."
)
grid = unique_grids[0]
FileWrite().create_thumbnail(
tuple(path for grid, path in rgbs),
thumb_path,
out_scale=scale_factor,
resampling=resampling,
static_stretch=static_stretch,
percentile_stretch=percentile_stretch,
input_geobox=grid,
)
self._checksum.add_file(thumb_path)
accessory_name = "thumbnail"
if kind:
accessory_name += f":{kind}"
self.add_accessory_file(accessory_name, thumb_path)