def test_scale_axis(layer_crs_geom):
scaler = WCSScaler(layer_crs_geom, "EPSG:4326")
scaler.to_crs("EPSG:3577")
scaler.scale_axis("x", 2.0)
scaler.scale_axis("y", 0.5)
assert scaler.dim("x") == (419380, -2407984.8524648934, 2834259.110253384)
assert scaler.dim("y") == (85187, -5195512.771063174, -936185.3115191332)
def get_coverage_data(request):
#pylint: disable=too-many-locals, protected-access
cfg = get_config()
layer_name = request.coverage_id
layer = cfg.product_index.get(layer_name)
if not layer or not layer.wcs:
raise WCS2Exception("Invalid coverage: %s" % layer_name,
WCS2Exception.NO_SUCH_COVERAGE,
locator="COVERAGE parameter",
valid_keys=list(cfg.product_index))
with cube() as dc:
if not dc:
raise WCS2Exception("Database connectivity failure")
#
# CRS handling
#
native_crs = layer.native_CRS
subsetting_crs = uniform_crs(cfg, request.subsetting_crs or native_crs)
output_crs = uniform_crs(cfg, request.output_crs or subsetting_crs)
if subsetting_crs not in cfg.published_CRSs:
raise WCS2Exception("Invalid subsettingCrs: %s" % subsetting_crs,
WCS2Exception.SUBSETTING_CRS_NOT_SUPPORTED,
locator=subsetting_crs,
valid_keys=list(cfg.published_CRSs))
output_crs = uniform_crs(
cfg, request.output_crs or subsetting_crs or native_crs)
if output_crs not in cfg.published_CRSs:
raise WCS2Exception("Invalid outputCrs: %s" % output_crs,
WCS2Exception.OUTPUT_CRS_NOT_SUPPORTED,
locator=output_crs,
valid_keys=list(cfg.published_CRSs))
#
# Subsetting/Scaling
#
scaler = WCSScaler(layer, subsetting_crs)
times = layer.ranges["times"]
subsets = request.subsets
if len(subsets) != len(
set(subset.dimension.lower() for subset in subsets)):
dimensions = [subset.dimension.lower() for subset in subsets]
duplicate_dimensions = [
item
for item, count in collections.Counter(dimensions).items()
if count > 1
]
raise WCS2Exception("Duplicate dimension%s: %s" %
('s' if len(duplicate_dimensions) > 1 else '',
', '.join(duplicate_dimensions)),
WCS2Exception.INVALID_SUBSETTING,
locator=','.join(duplicate_dimensions))
for subset in subsets:
dimension = subset.dimension.lower()
if dimension == 'time':
if isinstance(subset, Trim):
low = parse(
subset.low).date() if subset.low is not None else None
high = parse(subset.high).date(
) if subset.high is not None else None
if low is not None:
times = [time for time in times if time >= low]
if high is not None:
times = [time for time in times if time <= high]
elif isinstance(subset, Slice):
point = parse(subset.point).date()
times = [point]
else:
try:
if isinstance(subset, Trim):
scaler.trim(dimension, subset.low, subset.high)
elif isinstance(subset, Slice):
scaler.slice(dimension, subset.point)
except WCSScalerUnknownDimension:
raise WCS2Exception('Invalid subsetting axis %s' %
subset.dimension,
WCS2Exception.INVALID_AXIS_LABEL,
locator=subset.dimension)
#
# Transform spatial extent to native CRS.
#
scaler.to_crs(output_crs)
#
# Scaling
#
scales = request.scales
if len(scales) != len(set(subset.axis.lower() for subset in scales)):
axes = [subset.axis.lower() for subset in scales]
duplicate_axes = [
item for item, count in collections.Counter(axes).items()
if count > 1
]
raise WCS2Exception('Duplicate scales for ax%ss: %s' %
('i' if len(duplicate_axes) == 1 else 'e',
', '.join(duplicate_axes)),
WCS2Exception.INVALID_SCALE_FACTOR,
locator=','.join(duplicate_axes))
for scale in scales:
axis = scale.axis.lower()
if axis in ('time', 'k'):
raise WCS2Exception('Cannot scale axis %s' % scale.axis,
WCS2Exception.INVALID_SCALE_FACTOR,
locator=scale.axis)
else:
if isinstance(scale, ScaleAxis):
scaler.scale_axis(axis, scale.factor)
elif isinstance(scale, ScaleSize):
scaler.scale_size(axis, scale.size)
elif isinstance(scale, ScaleExtent):
scaler.scale_extent(axis, scale.low, scale.high)
#
# Rangesubset
#
band_labels = layer.band_idx.band_labels()
if request.range_subset:
bands = []
for range_subset in request.range_subset:
if isinstance(range_subset, str):
if range_subset not in band_labels:
raise WCS2Exception('No such field %s' % range_subset,
WCS2Exception.NO_SUCH_FIELD,
locator=range_subset,
valid_keys=band_labels)
bands.append(range_subset)
else:
if range_subset.start not in band_labels:
raise WCS2Exception(
'No such field %s' % range_subset.start,
WCS2Exception.ILLEGAL_FIELD_SEQUENCE,
locator=range_subset.start,
valid_keys=band_labels)
if range_subset.end not in band_labels:
raise WCS2Exception(
'No such field %s' % range_subset.end,
WCS2Exception.ILLEGAL_FIELD_SEQUENCE,
locator=range_subset.end,
valid_keys=band_labels)
start = band_labels.index(range_subset.start)
end = band_labels.index(range_subset.end)
bands.extend(
band_labels[start:(end + 1) if end > start else (end -
1)])
else:
bands = layer.wcs_default_bands # TODO: standard says differently
#
# Format handling
#
if not request.format:
fmt = cfg.wcs_formats_by_name[layer.native_format]
else:
try:
fmt = cfg.wcs_formats_by_mime[request.format]
except KeyError:
raise WCS2Exception("Unsupported format: %s" % request.format,
WCS2Exception.INVALID_PARAMETER_VALUE,
locator="FORMAT",
valid_keys=list(cfg.wcs_formats_by_mime))
if len(times) > 1 and not fmt.multi_time:
raise WCS2Exception(
"Format does not support multi-time datasets - "
"either constrain the time dimension or choose a different format",
WCS2Exception.INVALID_SUBSETTING,
locator="FORMAT or SUBSET")
affine = scaler.affine()
geobox = geometry.GeoBox(scaler.size.x, scaler.size.y, affine,
cfg.crs(output_crs))
stacker = DataStacker(layer, geobox, times, bands=bands)
n_datasets = stacker.datasets(dc.index, mode=MVSelectOpts.COUNT)
if layer.max_datasets_wcs > 0 and n_datasets > layer.max_datasets_wcs:
raise WCS2Exception(
"This request processes too much data to be served in a reasonable amount of time."
"Please reduce the bounds of your request and try again."
"(max: %d, this request requires: %d)" %
(layer.max_datasets_wcs, n_datasets))
elif n_datasets == 0:
raise WCS2Exception(
"The requested spatio-temporal subsets return no data.",
WCS2Exception.INVALID_SUBSETTING,
http_response=404)
datasets = stacker.datasets(dc.index)
if fmt.multi_time and len(times) > 1:
# Group by solar day
group_by = datacube.api.query.query_group_by(time=times,
group_by='solar_day')
datasets = dc.group_datasets(datasets, group_by)
output = stacker.data(datasets, skip_corrections=True)
# Clean extent flag band from output
for k, v in output.data_vars.items():
if k not in bands:
output = output.drop_vars([k])
#
# TODO: configurable
#
if fmt.mime == 'image/geotiff':
output = fmt.renderer(request.version)(request, output, output_crs,
layer, scaler.size.x,
scaler.size.y, affine)
else:
output = fmt.renderer(request.version)(request, output, output_crs)
headers = {
"Content-Type":
fmt.mime,
'content-disposition':
f'attachment; filename={request.coverage_id}.{fmt.extension}',
}
headers.update(layer.wcs_cache_rules.cache_headers(n_datasets))
return output, headers