def test_example_usage(self):
"""Check we can run example_usage without errors,
and that some extracted values behave as expected
"""
cmd = 'python example_usage.py'
import os
os.system(cmd)
stage_filled_file = './bathtub_outputs/stage_flood_filled.tif'
depth_filled_file = './bathtub_outputs/depth_flood_filled.tif'
elevation_file = './test_data/Res_500_elevation_less_100.tif'
stage_file = './test_data/Res_500_initial_stage.tif'
# Make points inside the ocean
inside_ocean_points = [[462900., 9325505.],
[491114., 9458604.],
[654703., 9349545.]]
inside_ocean_points = numpy.array(inside_ocean_points)
# Inside the ocean, stage_filled should = original stage
filled_stage_ocean = bathtub.raster_values_at_points(
inside_ocean_points, stage_filled_file)
raw_stage_ocean = bathtub.raster_values_at_points(
inside_ocean_points, stage_file)
assert numpy.allclose(filled_stage_ocean, raw_stage_ocean)
# Check that ocean has elevation+depth=stage
filled_depth_ocean = bathtub.raster_values_at_points(
inside_ocean_points, depth_filled_file)
elevation_ocean = bathtub.raster_values_at_points(
inside_ocean_points, elevation_file)
# Minor (rounding) error does appear, probably due to
# the residual being a small fraction of the depth/elevation
# from which it was derived
assert numpy.allclose(filled_depth_ocean + elevation_ocean,
raw_stage_ocean, atol=1.0e-03)
# Check that the bathtub stage values are 'fairly similar'
# to the nearby ocean values. I am not working from a rigorous
# understanding of gdal_fillnodata's algorithm [although the
# source is available]. Anyway we can check for general similarity
nearby_pairs_inside = numpy.array(
[[670742., 9344373.], [392230., 9381899.]])
nearby_pairs_outside = numpy.array(
[[687160., 9344373.], [389299., 9388348.]])
n_in = bathtub.raster_values_at_points(
nearby_pairs_inside, stage_file)
n_out = bathtub.raster_values_at_points(
nearby_pairs_inside, stage_filled_file)
assert numpy.allclose(n_in, n_out, atol=1.0e-02)
return
def test_raster_values_at_points(self):
""" Test raster_values_at_points works ok
"""
# These point values were manually extracted (to within the reported
# decimal places) in GIS
raster_file = './test_data/Res_500_initial_stage.tif'
point_values = [[445496, 9387281, 0.96923],
[352454, 9389770, -0.02730],
[344754, 9401707, numpy.nan]]
point_values = numpy.array(point_values)
extracted_values = bathtub.raster_values_at_points(
point_values[:, 0:2], raster_file)
assert abs(extracted_values[0] - point_values[0, 2]) < 1.0e-04
assert abs(extracted_values[1] - point_values[1, 2]) < 1.0e-04
# To check for nan, note that nan != nan
assert extracted_values[2] != extracted_values[2]
return
