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warp.py
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warp.py
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"""$ rio warp"""
from math import ceil
import click
from cligj import format_opt
import rasterio
from rasterio.crs import CRS
from rasterio.env import setenv
from rasterio.errors import CRSError
from rasterio.rio import options
from rasterio.rio.helpers import resolve_inout
from rasterio.transform import Affine
from rasterio.warp import (
reproject, Resampling, SUPPORTED_RESAMPLING, transform_bounds,
aligned_target, calculate_default_transform as calcdt)
# Improper usage of rio-warp can lead to accidental creation of
# extremely large datasets. We'll put a hard limit on the size of
# datasets and raise a usage error if the limits are exceeded.
MAX_OUTPUT_WIDTH = 100000
MAX_OUTPUT_HEIGHT = 100000
@click.command(short_help='Warp a raster dataset.')
@options.files_inout_arg
@options.output_opt
@format_opt
@click.option(
'--like',
type=click.Path(exists=True),
help='Raster dataset to use as a template for obtaining affine '
'transform (bounds and resolution), and crs.')
@click.option('--dst-crs', default=None,
help='Target coordinate reference system.')
@options.dimensions_opt
@click.option(
'--src-bounds',
nargs=4, type=float, default=None,
help="Determine output extent from source bounds: left bottom right top "
". Cannot be used with destination --bounds")
@click.option(
'--bounds', '--dst-bounds', 'dst_bounds', nargs=4, type=float, default=None,
help="Determine output extent from destination bounds: left bottom right top")
@options.resolution_opt
@click.option('--resampling',
type=click.Choice([r.name for r in SUPPORTED_RESAMPLING]),
default='nearest', help="Resampling method.",
show_default=True)
@click.option('--src-nodata', default=None, show_default=True,
type=float, help="Manually override source nodata")
@click.option('--dst-nodata', default=None, show_default=True,
type=float, help="Manually override destination nodata")
@click.option('--threads', type=int, default=1,
help='Number of processing threads.')
@click.option('--check-invert-proj/--no-check-invert-proj', default=True,
help='Constrain output to valid coordinate region in dst-crs')
@click.option('--target-aligned-pixels/--no-target-aligned-pixels', default=False,
help='align the output bounds based on the resolution')
@options.overwrite_opt
@options.creation_options
@click.pass_context
def warp(ctx, files, output, driver, like, dst_crs, dimensions, src_bounds,
dst_bounds, res, resampling, src_nodata, dst_nodata, threads,
check_invert_proj, overwrite, creation_options,
target_aligned_pixels):
"""
Warp a raster dataset.
If a template raster is provided using the --like option, the
coordinate reference system, affine transform, and dimensions of
that raster will be used for the output. In this case --dst-crs,
--bounds, --res, and --dimensions options are not applicable and
an exception will be raised.
\b
$ rio warp input.tif output.tif --like template.tif
The output coordinate reference system may be either a PROJ.4 or
EPSG:nnnn string,
\b
--dst-crs EPSG:4326
--dst-crs '+proj=longlat +ellps=WGS84 +datum=WGS84'
or a JSON text-encoded PROJ.4 object.
\b
--dst-crs '{"proj": "utm", "zone": 18, ...}'
If --dimensions are provided, --res and --bounds are not applicable and an
exception will be raised.
Resolution is calculated based on the relationship between the
raster bounds in the target coordinate system and the dimensions,
and may produce rectangular rather than square pixels.
\b
$ rio warp input.tif output.tif --dimensions 100 200 \\
> --dst-crs EPSG:4326
If --bounds are provided, --res is required if --dst-crs is provided
(defaults to source raster resolution otherwise).
\b
$ rio warp input.tif output.tif \\
> --bounds -78 22 -76 24 --res 0.1 --dst-crs EPSG:4326
"""
output, files = resolve_inout(
files=files, output=output, overwrite=overwrite)
resampling = Resampling[resampling] # get integer code for method
if not len(res):
# Click sets this as an empty tuple if not provided
res = None
else:
# Expand one value to two if needed
res = (res[0], res[0]) if len(res) == 1 else res
if target_aligned_pixels:
if not res:
raise click.BadParameter(
'--target-aligned-pixels requires a specified resolution')
if src_bounds or dst_bounds:
raise click.BadParameter(
'--target-aligned-pixels cannot be used with '
'--src-bounds or --dst-bounds')
# Check invalid parameter combinations
if like:
invalid_combos = (dimensions, dst_bounds, dst_crs, res)
if any(p for p in invalid_combos if p is not None):
raise click.BadParameter(
"--like cannot be used with any of --dimensions, --bounds, "
"--dst-crs, or --res")
elif dimensions:
invalid_combos = (dst_bounds, res)
if any(p for p in invalid_combos if p is not None):
raise click.BadParameter(
"--dimensions cannot be used with --bounds or --res")
with ctx.obj['env']:
setenv(CHECK_WITH_INVERT_PROJ=check_invert_proj)
with rasterio.open(files[0]) as src:
l, b, r, t = src.bounds
out_kwargs = src.profile
out_kwargs.update(driver=driver)
# Sort out the bounds options.
if src_bounds and dst_bounds:
raise click.BadParameter(
"--src-bounds and destination --bounds may not be "
"specified simultaneously.")
if like:
with rasterio.open(like) as template_ds:
dst_crs = template_ds.crs
dst_transform = template_ds.transform
dst_height = template_ds.height
dst_width = template_ds.width
elif dst_crs is not None:
try:
dst_crs = CRS.from_string(dst_crs)
except ValueError as err:
raise click.BadParameter(
str(err), param='dst_crs', param_hint='dst_crs')
if dimensions:
# Calculate resolution appropriate for dimensions
# in target.
dst_width, dst_height = dimensions
bounds = src_bounds or src.bounds
try:
xmin, ymin, xmax, ymax = transform_bounds(
src.crs, dst_crs, *bounds)
except CRSError as err:
raise click.BadParameter(
str(err), param='dst_crs', param_hint='dst_crs')
dst_transform = Affine(
(xmax - xmin) / float(dst_width),
0, xmin, 0,
(ymin - ymax) / float(dst_height),
ymax
)
elif src_bounds or dst_bounds:
if not res:
raise click.BadParameter(
"Required when using --bounds.",
param='res', param_hint='res')
if src_bounds:
try:
xmin, ymin, xmax, ymax = transform_bounds(
src.crs, dst_crs, *src_bounds)
except CRSError as err:
raise click.BadParameter(
str(err), param='dst_crs',
param_hint='dst_crs')
else:
xmin, ymin, xmax, ymax = dst_bounds
dst_transform = Affine(res[0], 0, xmin, 0, -res[1], ymax)
dst_width = max(int(ceil((xmax - xmin) / res[0])), 1)
dst_height = max(int(ceil((ymax - ymin) / res[1])), 1)
else:
try:
if src.transform.is_identity and src.gcps:
src_crs = src.gcps[1]
kwargs = {'gcps': src.gcps[0]}
else:
src_crs = src.crs
kwargs = src.bounds._asdict()
dst_transform, dst_width, dst_height = calcdt(
src_crs, dst_crs, src.width, src.height,
resolution=res, **kwargs)
except CRSError as err:
raise click.BadParameter(
str(err), param='dst_crs', param_hint='dst_crs')
elif dimensions:
# Same projection, different dimensions, calculate resolution.
dst_crs = src.crs
dst_width, dst_height = dimensions
l, b, r, t = src_bounds or (l, b, r, t)
dst_transform = Affine(
(r - l) / float(dst_width),
0, l, 0,
(b - t) / float(dst_height),
t
)
elif src_bounds or dst_bounds:
# Same projection, different dimensions and possibly
# different resolution.
if not res:
res = (src.transform.a, -src.transform.e)
dst_crs = src.crs
xmin, ymin, xmax, ymax = (src_bounds or dst_bounds)
dst_transform = Affine(res[0], 0, xmin, 0, -res[1], ymax)
dst_width = max(int(ceil((xmax - xmin) / res[0])), 1)
dst_height = max(int(ceil((ymax - ymin) / res[1])), 1)
elif res:
# Same projection, different resolution.
dst_crs = src.crs
dst_transform = Affine(res[0], 0, l, 0, -res[1], t)
dst_width = max(int(ceil((r - l) / res[0])), 1)
dst_height = max(int(ceil((t - b) / res[1])), 1)
else:
dst_crs = src.crs
dst_transform = src.transform
dst_width = src.width
dst_height = src.height
if target_aligned_pixels:
dst_transform, dst_width, dst_height = aligned_target(dst_transform, dst_width, dst_height, res)
# If src_nodata is not None, update the dst metadata NODATA
# value to src_nodata (will be overridden by dst_nodata if it is not None
if src_nodata is not None:
# Update the dst nodata value
out_kwargs.update(nodata=src_nodata)
# Validate a manually set destination NODATA value
# against the input datatype.
if dst_nodata is not None:
if src_nodata is None and src.meta['nodata'] is None:
raise click.BadParameter(
"--src-nodata must be provided because dst-nodata is not None")
else:
# Update the dst nodata value
out_kwargs.update(nodata=dst_nodata)
# When the bounds option is misused, extreme values of
# destination width and height may result.
if (dst_width < 0 or dst_height < 0 or
dst_width > MAX_OUTPUT_WIDTH or
dst_height > MAX_OUTPUT_HEIGHT):
raise click.BadParameter(
"Invalid output dimensions: {0}.".format(
(dst_width, dst_height)))
out_kwargs.update(
crs=dst_crs,
transform=dst_transform,
width=dst_width,
height=dst_height
)
# Adjust block size if necessary.
if ('blockxsize' in out_kwargs and
dst_width < out_kwargs['blockxsize']):
del out_kwargs['blockxsize']
if ('blockysize' in out_kwargs and
dst_height < out_kwargs['blockysize']):
del out_kwargs['blockysize']
out_kwargs.update(**creation_options)
with rasterio.open(output, 'w', **out_kwargs) as dst:
reproject(
source=rasterio.band(src, list(range(1, src.count + 1))),
destination=rasterio.band(
dst, list(range(1, src.count + 1))),
src_transform=src.transform,
src_crs=src.crs,
src_nodata=src_nodata,
dst_transform=out_kwargs['transform'],
dst_crs=out_kwargs['crs'],
dst_nodata=dst_nodata,
resampling=resampling,
num_threads=threads)