def test_regular_grid():
dg = SpatialDataGenerator()
dg.source = 'data/small.tif'
df = dg.regular_grid(100, 100)
assert len(df) > 0
assert (df.bounds.maxx - df.bounds.minx).mean() == 100
assert (df.bounds.maxy - df.bounds.miny).mean() == 100
def generate(path, count=5, size=(64, 64), indexes=1):
sdg = SpatialDataGenerator('data/small.tif', indexes=indexes)
sdg.source = 'data/small.tif'
df = sdg.random_grid(*size, count=count, units='pixels')
return fc.flow_to_numpy(sdg, df, *size, path=path)
def test_regular_grid_pixels():
dg = SpatialDataGenerator()
dg.source = 'data/small.tif'
df = dg.regular_grid(64, 64, units='pixels')
assert len(df) > 0
assert (df.bounds.maxx - df.bounds.minx).mean() == 64 * dg.src.res[0]
assert (df.bounds.maxy - df.bounds.miny).mean() == 64 * dg.src.res[1]
def test_get_batch_match_frame_len():
size = (64,64)
sdg = SpatialDataGenerator()
sdg.source = 'data/small.tif'
df = sdg.regular_grid(*size)
gen = sdg.flow_from_dataframe(df, *size, batch_size=3)
count = sum([batch.shape[0] for batch in gen])
assert count == len(df)
def test_get_size_upscale():
size = (64,64)
sdg = SpatialDataGenerator()
sdg.source = 'data/small.tif'
df = sdg.regular_grid(size[0]//4, size[1]//4)
gen = sdg.flow_from_dataframe(df, *size)
arr = next(gen)
assert len(arr.shape) == 4
assert arr.shape[0] == min(sdg.batch_size, len(df))
def test_sample_size():
sdg = SpatialDataGenerator()
sdg.source = 'data/small.tif'
df = sdg.regular_grid(64,64)
gen = sdg.flow_from_dataframe(df, 64, 64)
arr = next(gen)
assert len(arr.shape) == 4
assert arr.shape[0] == min(sdg.batch_size, len(df))
assert arr.shape[1] == 64 and arr.shape[2] == 64
def test_get_size_downscale():
size = (16, 16)
sdg = SpatialDataGenerator()
sdg.source = 'data/small.tif'
df = sdg.regular_grid(size[0] * 4, size[1] * 4)
gen = sdg.flow_from_dataframe(df, *size)
arr = next(gen)
assert len(arr.shape) == 4
assert arr.shape[0] == min(sdg.batch_size, len(df))
assert arr.shape[2] == size[1] and arr.shape[3] == size[0]
def test_sample_size():
size = (64, 64)
sdg = SpatialDataGenerator()
sdg.source = 'data/small.tif'
sdg.width, sdg.height = size
df = sdg.regular_grid(*size)
gen = sdg.flow_from_dataframe(df)
arr = next(gen)
assert len(arr.shape) == 4
assert arr.shape[0] == min(sdg.batch_size, len(df))
assert arr.shape[-2] == size[0] and arr.shape[-1] == size[1]
def test_get_batch_size_override():
size = (64,64)
batch_size = 2
sdg = SpatialDataGenerator()
sdg.source = 'data/small.tif'
df = sdg.regular_grid(*size)
gen = sdg.flow_from_dataframe(df, *size, batch_size=batch_size)
arr = next(gen)
assert len(arr.shape) == 4
assert arr.shape[0] == min(batch_size, len(df))
assert arr.shape[1] == size[1] and arr.shape[2] == size[0]
def test_preprocess_add_array():
def pre(arr):
return np.stack((arr, arr / 10))
size = (64, 64)
sdg = SpatialDataGenerator()
sdg.source = 'data/small.tif'
sdg.indexes = 1
sdg.width, sdg.height = size
df = sdg.regular_grid(*size)
sdg.add_preprocess_callback('pre', pre)
arr = next(sdg.flow_from_dataframe(df))
assert len(arr.shape) == 4
assert arr.shape[0] == min(sdg.batch_size, len(df))
assert arr.shape[1] == 2
assert arr.shape[-2] == size[0] and arr.shape[-1] == size[1]
def test_preprocess_modify_array():
def pre(arr, maxval):
return arr / maxval
size = (64, 64)
sdg = SpatialDataGenerator()
sdg.source = 'data/small.tif'
sdg.indexes = 1
sdg.width, sdg.height = size
df = sdg.regular_grid(*size)
df['max'] = [a.max() for a in sdg.flow_from_dataframe(df, batch_size=1)]
sdg.add_preprocess_callback('normalize', pre, df['max'].max())
arr = next(sdg.flow_from_dataframe(df))
assert len(arr.shape) == 3
assert arr.shape[0] == min(sdg.batch_size, len(df))
assert arr.shape[-2] == size[0] and arr.shape[-1] == size[1]
assert arr.max() <= 1.0
def test_flow_to_numpy():
size = (64, 64)
sdg = SpatialDataGenerator('data/small.tif', indexes=1)
sdg.source = 'data/small.tif'
df = sdg.random_grid(*size, count=5, units='pixels')
with TemporaryDirectory() as td:
tmpdir = Path(td)
filenames = fc.flow_to_numpy(sdg, df, *size, path=tmpdir)
assert isinstance(filenames, pd.Series)
for fname in filenames:
filepath = tmpdir / fname
assert filepath.exists()
arr = np.load(filepath)
assert len(arr.shape) == 4
assert arr.shape[0] == 1
assert arr.shape[1] == 1
assert arr.shape[2] == size[1] and arr.shape[3] == size[0]
def test_random_grid():
dg = SpatialDataGenerator()
dg.source = 'data/small.tif'
df = dg.random_grid(64, 64, 100)
assert len(df) == 100
def test_extent():
dg = SpatialDataGenerator()
dg.source = 'data/small.tif'
minx, miny, maxx, maxy = dg.extent
assert maxx > minx and maxy > miny
def test_missing_url():
dg = SpatialDataGenerator()
with pytest.raises(OSError):
dg.source = 'http://lidar.ncsa.illinois.edu:9000/test/xx'
def test_missing_local_file():
dg = SpatialDataGenerator()
with pytest.raises(OSError):
dg.source = 'xx'
def test_indexes_parameter_post_source():
dg = SpatialDataGenerator(indexes=1)
dg.source = 'data/small.tif'
assert dg.indexes == 1
def test_source_property():
dg = SpatialDataGenerator()
dg.source = 'data/small.tif'
assert dg.src
def test_random_grid():
dg = SpatialDataGenerator()
dg.source = 'data/small.tif'
dg.width, dg.height = 64, 64
df = dg.random_grid(100)
assert len(df) == 100
def test_regular_grid():
dg = SpatialDataGenerator()
dg.width, dg.height = 64, 64
dg.source = 'data/small.tif'
df = dg.regular_grid()
assert len(df) > 0
