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# Copyright Cartopy Contributors
#
# This file is part of Cartopy and is released under the LGPL license.
# See COPYING and COPYING.LESSER in the root of the repository for full
# licensing details.
import numpy as np
from numpy.testing import assert_array_equal
import pytest
import cartopy.crs as ccrs
import cartopy.io.srtm
from .test_downloaders import download_to_temp # noqa: F401 (used as fixture)
pytestmark = [pytest.mark.network,
pytest.mark.filterwarnings('ignore:SRTM requires an account'),
pytest.mark.usefixtures('srtm_login_or_skip')]
@pytest.fixture
def srtm_login_or_skip(monkeypatch):
import os
try:
srtm_username = os.environ['SRTM_USERNAME']
except KeyError:
pytest.skip('SRTM_USERNAME environment variable is unset.')
try:
srtm_password = os.environ['SRTM_PASSWORD']
except KeyError:
pytest.skip('SRTM_PASSWORD environment variable is unset.')
from urllib.request import (HTTPBasicAuthHandler,
HTTPCookieProcessor,
HTTPPasswordMgrWithDefaultRealm,
build_opener)
from http.cookiejar import CookieJar
password_manager = HTTPPasswordMgrWithDefaultRealm()
password_manager.add_password(
None,
"https://urs.earthdata.nasa.gov",
srtm_username,
srtm_password)
cookie_jar = CookieJar()
opener = build_opener(HTTPBasicAuthHandler(password_manager),
HTTPCookieProcessor(cookie_jar))
monkeypatch.setattr(cartopy.io, 'urlopen', opener.open)
class TestRetrieve:
@pytest.mark.parametrize('Source, read_SRTM, max_, min_, pt', [
(cartopy.io.srtm.SRTM3Source, cartopy.io.srtm.read_SRTM3,
602, -34, 78),
(cartopy.io.srtm.SRTM1Source, cartopy.io.srtm.read_SRTM1,
602, -37, 50),
], ids=[
'srtm3',
'srtm1',
])
def test_srtm_retrieve(self, Source, read_SRTM, max_, min_, pt,
download_to_temp): # noqa: F811
# test that the download mechanism for SRTM works
with pytest.warns(cartopy.io.DownloadWarning):
r = Source().srtm_fname(-4, 50)
assert r.startswith(str(download_to_temp)), \
'File not downloaded to tmp dir'
img, _, _ = read_SRTM(r)
# check that the data is fairly sensible
assert img.max() == max_
assert img.min() == min_
assert img[-10, 12] == pt
@pytest.mark.parametrize('Source, shape', [
(cartopy.io.srtm.SRTM3Source, (1201, 1201)),
(cartopy.io.srtm.SRTM1Source, (3601, 3601)),
], ids=[
'srtm3',
'srtm1',
])
def test_srtm_out_of_range(self, Source, shape):
# Somewhere over the pacific the elevation should be 0.
img, _, _ = Source().combined(120, 2, 2, 2)
assert_array_equal(img, np.zeros(np.array(shape) * 2))
@pytest.mark.parametrize('Source', [
cartopy.io.srtm.SRTM3Source,
cartopy.io.srtm.SRTM1Source,
], ids=[
'srtm3',
'srtm1',
])
class TestSRTMSource__single_tile:
def test_out_of_range(self, Source):
source = Source()
match = r'No srtm tile found for those coordinates\.'
with pytest.raises(ValueError, match=match):
source.single_tile(-25, 50)
def test_in_range(self, Source):
if Source == cartopy.io.srtm.SRTM3Source:
shape = (1201, 1201)
elif Source == cartopy.io.srtm.SRTM1Source:
shape = (3601, 3601)
else:
raise ValueError('Source is of unexpected type.')
source = Source()
img, crs, extent = source.single_tile(-1, 50)
assert isinstance(img, np.ndarray)
assert img.shape == shape
assert img.dtype == np.dtype('>i2')
assert crs == ccrs.PlateCarree()
assert extent == (-1, 0, 50, 51)
def test_zeros(self, Source):
source = Source()
_, _, extent = source.single_tile(0, 50)
assert extent == (0, 1, 50, 51)
@pytest.mark.parametrize('Source', [
cartopy.io.srtm.SRTM3Source,
cartopy.io.srtm.SRTM1Source,
], ids=[
'srtm3',
'srtm1',
])
class TestSRTMSource__combined:
def test_trivial(self, Source):
source = Source()
e_img, e_crs, e_extent = source.single_tile(-3, 50)
r_img, r_crs, r_extent = source.combined(-3, 50, 1, 1)
assert_array_equal(e_img, r_img)
assert e_crs == r_crs
assert e_extent == r_extent
def test_2by2(self, Source):
source = Source()
e_img, _, e_extent = source.combined(-1, 50, 2, 1)
assert e_extent == (-1, 1, 50, 51)
imgs = [source.single_tile(-1, 50)[0],
source.single_tile(0, 50)[0]]
assert_array_equal(np.hstack(imgs), e_img)
@pytest.mark.parametrize('Source', [
cartopy.io.srtm.SRTM3Source,
cartopy.io.srtm.SRTM1Source,
], ids=[
'srtm3',
'srtm1',
])
def test_fetch_raster_ascombined(Source):
source = Source()
e_img, e_crs, e_extent = source.combined(-1, 50, 2, 1)
imgs = source.fetch_raster(ccrs.PlateCarree(),
(-0.9, 0.1, 50.1, 50.999),
None)
assert len(imgs) == 1
r_img, r_extent = imgs[0]
assert e_extent == r_extent
assert_array_equal(e_img[::-1, :], r_img)
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