def _location_to_tile_name(cls,
xs,
ys,
tile_size=1,
ns_fixed_width=None,
ew_fixed_width=None):
"""Convert locations to SRTM tile name.
For example, (-120.5, 40.1) becomes N40W121. The lower left corner of
the tile is used. The numbers can be padded with leading zeroes to all
be the same width.
Args:
xs, ys: Lists of x and y coordinates.
tile_size: Which value to round the tiles to.
ns_fixed_width, ew_fixed_width: Integer to pad with zeroes. None means no padding.
Returns:
tile_names: List of strings.
"""
n_or_s = np.where(ys >= 0, "N", "S")
e_or_w = np.where(xs >= 0, "E", "W")
ns_value = np.abs(utils.base_floor(ys,
tile_size)).astype(int).astype(str)
ew_value = np.abs(utils.base_floor(xs,
tile_size)).astype(int).astype(str)
ns_fixed_width = ns_fixed_width or 0
ew_fixed_width = ew_fixed_width or 0
ns_value = [x.zfill(ns_fixed_width) for x in ns_value]
ew_value = [x.zfill(ew_fixed_width) for x in ew_value]
tile_names = np.char.add(n_or_s, ns_value)
tile_names = np.char.add(tile_names, e_or_w)
tile_names = np.char.add(tile_names, ew_value)
return tile_names
def test_negative_value(self):
assert utils.base_floor(-5.1, 5) == -10
def test_other_base(self):
assert utils.base_floor(290.9, 50) == 250
def test_base_1_default(self):
values = [-1, 0, 1, -0.6, -0.4, 0.4, 0.6, 99.91]
for x in values:
assert np.floor(x) == utils.base_floor(x)
assert np.floor(x) == utils.base_floor(x, 1)
