def get_bounding_boxes(haz_metadata, exp_metadata, req_bbox):
"""Check and get appropriate bounding boxes for input layers
Input
haz_metadata: Metadata for hazard layer
exp_metadata: Metadata for exposure layer
req_bbox: Bounding box (string) as requested by HTML POST.
Output
haz_bbox: Bounding box to be used for hazard layer.
exp_bbox: Bounding box to be used for exposure layer
imp_bbox: Bounding box to be used for resulting impact layer
Note exp_bbox and imp_bbox are the same and calculated as the
intersection among hazard, exposure and viewport bounds.
haz_bbox may be grown by one pixel size in case exposure data
is vector data to make sure points always can be interpolated
"""
# Input checks
msg = ('Invalid bounding box %s (%s). '
'It must be a string' % (str(req_bbox), type(req_bbox)))
assert isinstance(req_bbox, basestring), msg
check_bbox_string(req_bbox)
# Get bounding boxes for layers and viewport
haz_bbox = haz_metadata['bounding_box']
exp_bbox = exp_metadata['bounding_box']
vpt_bbox = bboxstring2list(req_bbox)
# New bounding box for data common to hazard, exposure and viewport
# Download only data within this intersection
intersection_bbox = bbox_intersection(vpt_bbox, haz_bbox, exp_bbox)
if intersection_bbox is None:
# Bounding boxes did not overlap
msg = ('Bounding boxes of hazard data [%s], exposure data [%s] '
'and viewport [%s] did not overlap, so no computation was '
'done. Please make sure you pan to where the data is and '
'that hazard and exposure data overlaps.'
% (bboxlist2string(haz_bbox, decimals=3),
bboxlist2string(exp_bbox, decimals=3),
bboxlist2string(vpt_bbox, decimals=3)))
logger.info(msg)
raise Exception(msg)
# Grow hazard bbox to buffer this common bbox in case where
# hazard is raster and exposure is vector
if (haz_metadata['layer_type'] == 'raster' and
exp_metadata['layer_type'] == 'vector'):
haz_res = haz_metadata['resolution']
haz_bbox = buffered_bounding_box(intersection_bbox, haz_res)
else:
haz_bbox = intersection_bbox
# Usually the intersection bbox is used for both exposure layer and result
exp_bbox = imp_bbox = intersection_bbox
return haz_bbox, exp_bbox, imp_bbox
def get_bounding_boxes(haz_metadata, exp_metadata, req_bbox):
"""Check and get appropriate bounding boxes for input layers
Input
haz_metadata: Metadata for hazard layer
exp_metadata: Metadata for exposure layer
req_bbox: Bounding box (string) as requested by HTML POST.
Output
haz_bbox: Bounding box to be used for hazard layer.
exp_bbox: Bounding box to be used for exposure layer
imp_bbox: Bounding box to be used for resulting impact layer
Note exp_bbox and imp_bbox are the same and calculated as the
intersection among hazard, exposure and viewport bounds.
haz_bbox may be grown by one pixel size in case exposure data
is vector data to make sure points always can be interpolated
"""
# Input checks
msg = ('Invalid bounding box %s (%s). '
'It must be a string' % (str(req_bbox), type(req_bbox)))
assert isinstance(req_bbox, basestring), msg
check_bbox_string(req_bbox)
# Get bounding boxes for layers and viewport
haz_bbox = haz_metadata['bounding_box']
exp_bbox = exp_metadata['bounding_box']
vpt_bbox = bboxstring2list(req_bbox)
# New bounding box for data common to hazard, exposure and viewport
# Download only data within this intersection
intersection_bbox = bbox_intersection(vpt_bbox, haz_bbox, exp_bbox)
if intersection_bbox is None:
# Bounding boxes did not overlap
msg = ('Bounding boxes of hazard data [%s], exposure data [%s] '
'and viewport [%s] did not overlap, so no computation was '
'done. Please make sure you pan to where the data is and '
'that hazard and exposure data overlaps.' %
(bboxlist2string(haz_bbox, decimals=3),
bboxlist2string(exp_bbox, decimals=3),
bboxlist2string(vpt_bbox, decimals=3)))
logger.info(msg)
raise Exception(msg)
# Grow hazard bbox to buffer this common bbox in case where
# hazard is raster and exposure is vector
if (haz_metadata['layer_type'] == 'raster'
and exp_metadata['layer_type'] == 'vector'):
haz_res = haz_metadata['resolution']
haz_bbox = buffered_bounding_box(intersection_bbox, haz_res)
else:
haz_bbox = intersection_bbox
# Usually the intersection bbox is used for both exposure layer and result
exp_bbox = imp_bbox = intersection_bbox
return haz_bbox, exp_bbox, imp_bbox
