def get_subset(src_ds, range_type, subset_rect, dst_rect, rangesubset=None):
""" Get subset of the image (as GDAL dataset) matching the requsted
pixel rectangle.
"""
vrt = VRTBuilder(*subset_rect.size)
input_bands = list(range_type)
# list of band indices/names. defaults to all bands
if rangesubset:
subset_bands = rangesubset.get_band_indices(range_type, 1)
else:
subset_bands = xrange(1, len(range_type) + 1)
for dst_index, src_index in enumerate(subset_bands, start=1):
input_band = input_bands[src_index-1]
vrt.add_band(input_band.data_type)
vrt.add_simple_source(
dst_index, src_ds, src_index, subset_rect, dst_rect
)
vrt.copy_metadata(src_ds)
vrt.copy_gcps(src_ds, subset_rect)
return vrt.dataset
def get_source_and_dest_rect(self, dataset, subsets):
size_x, size_y = dataset.RasterXSize, dataset.RasterYSize
image_rect = Rect(0, 0, size_x, size_y)
if not subsets:
subset_rect = image_rect
# pixel subset
elif subsets.srid is None: # means "imageCRS"
minx, miny, maxx, maxy = subsets.xy_bbox
minx = int(minx) if minx is not None else image_rect.offset_x
miny = int(miny) if miny is not None else image_rect.offset_y
maxx = int(maxx) if maxx is not None else image_rect.upper_x
maxy = int(maxy) if maxy is not None else image_rect.upper_y
subset_rect = Rect(minx, miny, maxx - minx + 1, maxy - miny + 1)
# subset in geographical coordinates
else:
vrt = VRTBuilder(*image_rect.size)
vrt.copy_gcps(dataset)
options = reftools.suggest_transformer(dataset)
subset_rect = reftools.rect_from_subset(vrt.dataset, subsets.srid, *subsets.xy_bbox, **options)
# check whether or not the subsets intersect with the image
if not image_rect.intersects(subset_rect):
raise RenderException("Subset outside coverage extent.", "subset")
src_rect = subset_rect # & image_rect # TODO: why no intersection??
dst_rect = src_rect - subset_rect.offset
return src_rect, dst_rect
def perform_range_subset(self, src_ds, range_type, subset_bands,
subset_rect):
vrt = VRTBuilder(src_ds.RasterXSize, src_ds.RasterYSize)
dst_rect = Rect(0, 0, src_ds.RasterXSize, src_ds.RasterYSize)
input_bands = list(range_type)
for index, subset_band in enumerate(subset_bands, start=1):
if isinstance(subset_band, int):
if subset_band > 0:
subset_band = len(range_type) + subset_band
else:
subset_band = index_of(input_bands,
lambda band: (
band.name == subset_band
or band.identifier == subset_band
)
)
if subset_band is None:
raise ValueError("Invalid range subset.")
# prepare and add a simple source for the band
input_band = input_bands[subset_band]
vrt.add_band(input_band.data_type)
vrt.add_simple_source(
index, src_ds, subset_band, subset_rect, dst_rect
)
vrt.copy_metadata(src_ds)
vrt.copy_gcps(src_ds, subset_rect)
return vrt.dataset
def perform_subset(self,
src_ds,
range_type,
subset_rect,
dst_rect,
rangesubset=None):
vrt = VRTBuilder(*subset_rect.size)
input_bands = list(range_type)
# list of band indices/names. defaults to all bands
if rangesubset:
subset_bands = rangesubset.get_band_indices(range_type, 1)
else:
subset_bands = xrange(1, len(range_type) + 1)
for dst_index, src_index in enumerate(subset_bands, start=1):
input_band = input_bands[src_index - 1]
vrt.add_band(input_band.data_type)
vrt.add_simple_source(dst_index, src_ds, src_index, subset_rect,
dst_rect)
vrt.copy_metadata(src_ds)
vrt.copy_gcps(src_ds, subset_rect)
return vrt.dataset
def perform_subset(self, src_ds, subset_rect):
vrt = VRTBuilder(src_ds.RasterXSize, src_ds.RasterYSize)
dst_rect = Rect(0, 0, src_ds.RasterXSize, src_ds.RasterYSize)
for index in xrange(1, src_ds.RasterCount + 1):
src_band = src_ds.GetRasterBand(index)
vrt.add_band(src_band.DataType)
vrt.add_simple_source(index, src_ds, index, subset_rect, dst_rect)
vrt.copy_metadata(src_ds)
vrt.copy_gcps(src_ds, subset_rect)
return vrt.dataset
def perform_subset(self, src_ds, range_type, subset_rect, dst_rect, rangesubset=None):
vrt = VRTBuilder(*subset_rect.size)
input_bands = list(range_type)
# list of band indices/names. defaults to all bands
if rangesubset:
subset_bands = rangesubset.get_band_indices(range_type, 1)
else:
subset_bands = xrange(1, len(range_type) + 1)
for dst_index, src_index in enumerate(subset_bands, start=1):
input_band = input_bands[src_index - 1]
vrt.add_band(input_band.data_type)
vrt.add_simple_source(dst_index, src_ds, src_index, subset_rect, dst_rect)
vrt.copy_metadata(src_ds)
vrt.copy_gcps(src_ds, subset_rect)
return vrt.dataset
def get_source_image_rect(self, dataset, subsets):
size_x, size_y = dataset.RasterXSize, dataset.RasterYSize
image_rect = Rect(0, 0, size_x, size_y)
if not subsets:
subset_rect = image_rect
# pixel subset
elif subsets.xy_srid is None: # means "imageCRS"
minx, miny, maxx, maxy = subsets.xy_bbox
minx = minx if minx is not None else image_rect.offset_x
miny = miny if miny is not None else image_rect.offset_y
maxx = maxx if maxx is not None else image_rect.upper_x
maxy = maxy if maxy is not None else image_rect.upper_y
subset_rect = Rect(minx, miny, maxx-minx, maxy-miny)
else:
vrt = VRTBuilder(size_x, size_y)
vrt.copy_gcps(dataset)
minx, miny, maxx, maxy = subsets.xy_bbox
# subset in geographical coordinates
subset_rect = reftools.rect_from_subset(
vrt.dataset, subsets.xy_srid, minx, miny, maxx, maxy
)
# check whether or not the subsets intersect with the image
if not image_rect.intersects(subset_rect):
raise Exception("Subset outside coverage extent.") # TODO: correct exception
# in case the input and output rects are the same, return None to
# indicate this
#if image_rect == subset_rect:
# return None
return image_rect & subset_rect
def get_source_and_dest_rect(self, dataset, subsets):
size_x, size_y = dataset.RasterXSize, dataset.RasterYSize
image_rect = Rect(0, 0, size_x, size_y)
if not subsets:
subset_rect = image_rect
# pixel subset
elif subsets.srid is None: # means "imageCRS"
minx, miny, maxx, maxy = subsets.xy_bbox
minx = int(minx) if minx is not None else image_rect.offset_x
miny = int(miny) if miny is not None else image_rect.offset_y
maxx = int(maxx) if maxx is not None else image_rect.upper_x
maxy = int(maxy) if maxy is not None else image_rect.upper_y
subset_rect = Rect(minx, miny, maxx - minx + 1, maxy - miny + 1)
# subset in geographical coordinates
else:
vrt = VRTBuilder(*image_rect.size)
vrt.copy_gcps(dataset)
options = reftools.suggest_transformer(dataset)
subset_rect = reftools.rect_from_subset(vrt.dataset, subsets.srid,
*subsets.xy_bbox,
**options)
# check whether or not the subsets intersect with the image
if not image_rect.intersects(subset_rect):
raise RenderException("Subset outside coverage extent.", "subset")
src_rect = subset_rect #& image_rect # TODO: why no intersection??
dst_rect = src_rect - subset_rect.offset
return src_rect, dst_rect
