def test_read_raster(self):
"""Test that raster can be read from file and accessed.
"""
# FIXME (Ole): Some datasets show very large differences between extrema in the array and
# those computed by GDAL. This may warrant another bug report to GEOS
for coverage_name in [
"test_grid",
"shakemap_padang_20090930",
"population_padang_1",
"population_padang_2",
#'fatality_padang_1',
#'fatality_padang_2'
]:
filename = "data/%s.asc" % coverage_name
for R in [Raster(filename), read_coverage(filename)]:
min, max = R.get_extrema()
A = R.get_data(nan=True)
B = R.get_data(nan=True)
assert numpy.nanmax(A - B) == 0
# FIXME (Ole): These tolerances are not really acceptable. Report to GEOS.
assert numpy.allclose(min, numpy.nanmin(A[:]), rtol=1e-2)
if coverage_name != "population_padang_2":
assert numpy.allclose(max, numpy.nanmax(A[:]), rtol=1e-2)
def test_bins(self):
"""Test that linear and quantile bins are correct
"""
for filename in ["data/population_padang_1.asc", "data/test_grid.asc"]:
R = read_coverage(filename)
min, max = R.get_extrema() # use_numeric=True)
for N in [2, 3, 5, 7, 10, 16]:
linear_intervals = R.get_bins(N=N, quantiles=False)
assert linear_intervals[0] == min
assert linear_intervals[-1] == max
d = (max - min) / N
for i in range(N):
assert numpy.allclose(linear_intervals[i], min + i * d)
quantiles = R.get_bins(N=N, quantiles=True)
A = R.get_data(nan=True).flat[:]
mask = numpy.logical_not(numpy.isnan(A)) # Omit NaN's
l1 = len(A)
A = A.compress(mask)
l2 = len(A)
if filename == "data/test_grid.asc":
# Check that NaN's were removed
assert l1 == 35
assert l2 == 30
# Assert that there are no NaN's
assert not numpy.alltrue(numpy.isnan(A))
number_of_elements = len(A)
average_elements_per_bin = number_of_elements / N
# Count elements in each bin and check
i0 = quantiles[0]
for i1 in quantiles[1:]:
count = numpy.sum((i0 < A) & (A < i1))
if i0 == quantiles[0]:
refcount = count
if i1 < quantiles[-1]:
# Number of elements in each bin must vary by no more than 1
assert abs(count - refcount) <= 1
assert abs(count - average_elements_per_bin) <= 3
else:
# The last bin is allowed vary by more
pass
i0 = i1
def test_read_and_write_of_rasters(self):
"""Test that rasters can be read and written correctly
"""
for coveragename in ['Earthquake_Ground_Shaking_clip.tif',
'Population_2010_clip.tif',
'shakemap_padang_20090930.asc',
'population_padang_1.asc']:
filename = 'data/%s' % coveragename
for R1 in [Raster(filename), read_coverage(filename)]:
# Check consistency of raster
A1 = R1.get_data()
M, N = A1.shape
msg = 'Dimensions of raster array do not match those of raster file %s' % R1.filename
assert M == R1.rows, msg
assert N == R1.columns, msg
# Write back to new file
outfilename = '/tmp/%s' % coveragename
try:
os.remove(outfilename)
except:
pass
write_coverage_to_geotiff(A1, outfilename, R1.get_projection(), R1.get_geotransform())
# Read again and check consistency
R2 = Raster(outfilename)
msg = 'Dimensions of written raster array do not match those of input raster file\n'
msg += ' Dimensions of input file %s: (%s, %s)\n' % (R1.filename, R1.rows, R1.columns)
msg += ' Dimensions of output file %s: (%s, %s)' % (R2.filename, R2.rows, R2.columns)
assert R1.rows == R2.rows, msg
assert R1.columns == R2.columns, msg
A2 = R2.get_data()
assert numpy.allclose(numpy.min(A1), numpy.min(A2))
assert numpy.allclose(numpy.max(A1), numpy.max(A2))
msg = 'Array values of written raster array were not as expected'
assert numpy.allclose(A1, A2), msg
# NOTE: This does not always hold as projection text might differ slightly. E.g.
#assert R1.get_projection() == R2.get_projection(), msg
#E.g. These two refer to the same projection
#GEOGCS["GCS_WGS_1984",DATUM["WGS_1984",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]]
#GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,298.2572235630016,AUTHORITY["EPSG","7030"]],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0],UNIT["degree",0.0174532925199433],AUTHORITY["EPSG","4326"]]
msg = 'Geotransforms were different'
assert R1.get_geotransform() == R2.get_geotransform(), msg
def test_nodata(self):
"""Test that NODATA is treated correctly
"""
filename = "data/test_grid.asc"
R = read_coverage(filename)
nan = R.get_nodata_value()
assert nan == -9999
A = R.get_data(nan=False)
assert numpy.min(A[:]) == -9999
assert numpy.allclose(numpy.max(A[:]), 50.9879837036)
A = R.get_data(nan=True)
assert numpy.allclose(numpy.nanmin(A[:]), -50.60135540866)
assert numpy.allclose(numpy.nanmax(A[:]), 50.9879837036)
def test_raster_extrema(self):
"""Test that raster extrema are correct.
"""
# FIXME (Ole): Some datasets show very large differences between extrema in the array and
# those computed by GDAL. This may warrant another bug report to GEOS
for coveragename in ['Earthquake_Ground_Shaking_clip.tif',
'Population_2010_clip.tif',
'shakemap_padang_20090930.asc',
'population_padang_1.asc',
'population_padang_2.asc']:
filename = 'data/%s' % coveragename
for R in [Raster(filename), read_coverage(filename)]:
# Check consistency of raster
minimum, maximum = R.get_extrema()
# Check that arrays with NODATA value replaced by NaN's agree
A = R.get_data(nan=False)
B = R.get_data(nan=True)
assert A.dtype == B.dtype
assert numpy.nanmax(A-B) == 0
assert numpy.nanmax(B-A) == 0
assert numpy.nanmax(numpy.abs(A-B)) == 0
# Check that GDAL's reported extrema match real extrema
# FIXME (Ole): The discrepancies are not acceptable. Report to GEOS.
assert numpy.allclose(maximum, numpy.max(A[:]), rtol=1.0e-1) # FIXME: Very very high rtol
assert numpy.allclose(maximum, numpy.nanmax(B[:]), rtol=1.0e-1) # FIXME: Very very high rtol
assert numpy.allclose(minimum, numpy.min(A[:]), rtol=1e-2) # FIXME: Not good either
def test_get_raster_data(self):
"""Test that raster data can be retrieved from server and read into Python Raster object.
"""
for coverage_name, reference_range in [('shakemap_padang_20090930', [3.025794, 8.00983]),
('population_padang_1', [50., 1835.]),
('population_padang_2', [50., 1835.]),
('fatality_padang_1', [4.08928e-07, 0.5672711486]),
('fatality_padang_2', [4.08928e-07, 1.07241])]:
# Upload first to make sure data is there
self.api.create_workspace(geoserver_username, geoserver_userpass, geoserver_url, test_workspace_name)
lh = self.api.create_geoserver_layer_handle(geoserver_username,
geoserver_userpass,
geoserver_url,
coverage_name,
test_workspace_name)
upload_filename = 'data/%s.asc' % coverage_name
res = self.api.upload_geoserver_layer(upload_filename, lh)
assert res.startswith('SUCCESS'), res
# Get bounding box for the uploaded TIF file
bounding_box = get_bounding_box('%s.tif' % coverage_name)
# Download using the API and test that the data is the same.
raster = self.api.get_raster_data(lh,
bounding_box)
#ref_shape = (254, 250) # FIXME (Ole): This is what it should be
ref_shape = (253, 249) # but Geoserver shrinks it by one row and one column?????????
data = raster.get_data(nan=True)
shape = data.shape
msg = 'Got shape %s, should have been %s' % (shape, ref_shape)
assert numpy.allclose(shape, ref_shape), msg
# Now compare the numerical data
reference_raster = read_coverage(upload_filename)
ref_data = reference_raster.get_data(nan=True)
# Range
assert numpy.allclose([numpy.nanmin(ref_data[:]), numpy.nanmax(ref_data[:])],
reference_range)
assert numpy.allclose([numpy.nanmin(data[:]), numpy.nanmax(data[:])],
reference_range)
# Sum up (ignoring NaN) and compare
refsum = numpy.nansum(numpy.abs(ref_data))
actualsum = numpy.nansum(numpy.abs(data))
#print
#print 'Ref vs act and diff', refsum, actualsum, abs(refsum - actualsum), abs(refsum - actualsum)/refsum
assert abs(refsum - actualsum)/refsum < 1.0e-2
# Check that raster data can be written back (USING COMPLETE HACK)
try:
i += 1
except:
i = 0
layername = 'stored_raster_%i' % i
output_file = 'data/%s.asc' % layername
write_coverage_to_ascii(raster.data, output_file,
xllcorner = bounding_box[0],
yllcorner = bounding_box[1],
cellsize=0.030741064,
nodata_value=-9999,
projection=open('data/%s.prj' % coverage_name).read())
# And upload it again
lh = self.api.create_geoserver_layer_handle(geoserver_username,
geoserver_userpass,
geoserver_url,
'',
test_workspace_name)
self.api.upload_geoserver_layer(output_file, lh)
# Check that layer is there
found = False
page = get_web_page(os.path.join(geoserver_url, 'rest/layers'),
username=geoserver_username,
password=geoserver_userpass)
for line in page:
if line.find('rest/layers/%s.html' % layername) > 0:
found = True
assert found
