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reader.py
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reader.py
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"""MultiBand reader."""
import abc
import re
import warnings
from functools import lru_cache
from typing import Any, Dict, List, Optional, Sequence, Tuple, Type, Union
import attr
import numpy
import rasterio
from rasterio import transform
from rasterio.vrt import WarpedVRT
from rasterio.warp import transform_bounds
from rio_tiler import constants
from rio_tiler.errors import ExpressionMixingWarning
from rio_tiler.expression import apply_expression
from rio_tiler.io import BaseReader, COGReader
from rio_tiler.tasks import multi_arrays, multi_values
from rio_tiler.utils import aws_get_object
from .errors import MissingBands
@lru_cache(maxsize=512)
def get_object(bucket: str, key: str, request_pays: bool = False) -> bytes:
"""Add LRU cache on top of AWS Get Object."""
return aws_get_object(bucket, key, request_pays=request_pays)
@attr.s
class MultiBandReader(BaseReader, metaclass=abc.ABCMeta):
"""Multi Band Reader.
Attributes:
bounds (tuple): Dataset's bounds.
minzoom (int): Dataset's Min Zoom level.
maxzoom (int): Dataset's Max Zoom level.
"""
reader: Type[BaseReader] = attr.ib()
reader_options: Dict = attr.ib(factory=dict)
bounds: Tuple[float, float, float, float] = attr.ib(init=False)
bands: Sequence[str] = attr.ib(init=False)
minzoom: int = attr.ib(init=False)
maxzoom: int = attr.ib(init=False)
@abc.abstractmethod
def _get_band_url(self, band: str) -> str:
"""Validate band name and construct url."""
...
def parse_expression(self, expression: str) -> Tuple:
"""Parse rio-tiler band math expression."""
bands = "|".join([fr"\b{band}\b" for band in self.bands])
_re = re.compile(bands.replace("\\\\", "\\"))
return tuple(set(re.findall(_re, expression)))
@property
def center(self) -> Tuple[float, float, int]:
"""Dataset center + minzoom."""
return (
(self.bounds[0] + self.bounds[2]) / 2,
(self.bounds[1] + self.bounds[3]) / 2,
self.minzoom,
)
@property
def spatial_info(self) -> Dict:
"""Dataset's spatial info (bounds, center and zooms)."""
return {
"bounds": self.bounds,
"center": self.center,
"minzoom": self.minzoom,
"maxzoom": self.maxzoom,
}
def info(
self, bands: Union[Sequence[str], str] = None, *args, **kwargs: Any
) -> Dict:
"""Return metadata from multiple bands"""
if not bands:
raise MissingBands("Missing 'bands' option")
if isinstance(bands, str):
bands = (bands,)
def _reader(band: str, **kwargs: Any) -> Dict:
url = self._get_band_url(band)
with self.reader(url, **self.reader_options) as cog:
return cog.info()
bands_metadata = multi_values(bands, _reader, *args, **kwargs)
meta = self.spatial_info
meta["band_metadata"] = [
(ix + 1, bands_metadata[band]["band_metadata"][0][1])
for ix, band in enumerate(bands)
]
meta["band_descriptions"] = [(ix + 1, band) for ix, band in enumerate(bands)]
meta["dtype"] = bands_metadata[bands[0]]["dtype"]
meta["colorinterp"] = [
bands_metadata[band]["colorinterp"][0] for _, band in enumerate(bands)
]
meta["nodata_type"] = bands_metadata[bands[0]]["nodata_type"]
return meta
def stats(
self,
pmin: float = 2.0,
pmax: float = 98.0,
hist_options: Optional[Dict] = None,
bands: Union[Sequence[str], str] = None,
**kwargs: Any,
) -> Dict:
"""Return array statistics from multiple bands"""
if not bands:
raise MissingBands("Missing 'bands' option")
if isinstance(bands, str):
bands = (bands,)
def _reader(band: str, *args, **kwargs) -> Dict:
url = self._get_band_url(band)
with self.reader(url, **self.reader_options) as cog:
return cog.stats(*args, **kwargs)[1]
return multi_values(
bands, _reader, pmin, pmax, hist_options=hist_options, *kwargs,
)
def metadata(
self,
pmin: float = 2.0,
pmax: float = 98.0,
bands: Union[Sequence[str], str] = None,
**kwargs: Any,
) -> Dict:
"""Return metadata from multiple bands"""
if not bands:
raise MissingBands("Missing 'bands' option")
if isinstance(bands, str):
bands = (bands,)
def _reader(band: str, *args, **kwargs) -> Dict:
url = self._get_band_url(band)
with self.reader(url, **self.reader_options) as cog:
meta = cog.metadata(*args, **kwargs)
meta["statistics"] = meta["statistics"][1]
return meta
bands_metadata = multi_values(bands, _reader, pmin, pmax, **kwargs)
meta = self.spatial_info
meta["band_metadata"] = [
(ix + 1, bands_metadata[band]["band_metadata"][0][1])
for ix, band in enumerate(bands)
]
meta["band_descriptions"] = [(ix + 1, band) for ix, band in enumerate(bands)]
meta["dtype"] = bands_metadata[bands[0]]["dtype"]
meta["colorinterp"] = [
bands_metadata[band]["colorinterp"][0] for _, band in enumerate(bands)
]
meta["nodata_type"] = bands_metadata[bands[0]]["nodata_type"]
meta["statistics"] = {
band: bands_metadata[band]["statistics"] for _, band in enumerate(bands)
}
return meta
def tile(
self,
tile_x: int,
tile_y: int,
tile_z: int,
bands: Union[Sequence[str], str] = None,
expression: Optional[str] = "",
band_expression: Optional[
str
] = "", # Expression for each band based on index names
**kwargs: Any,
) -> Tuple[numpy.ndarray, numpy.ndarray]:
"""Read a Mercator Map tile multiple bands."""
if isinstance(bands, str):
bands = (bands,)
if bands and expression:
warnings.warn(
"Both expression and bands passed; expression will overwrite bands parameter.",
ExpressionMixingWarning,
)
if expression:
bands = self.parse_expression(expression)
if not bands:
raise MissingBands(
"bands must be passed either via expression or bands options."
)
def _reader(
band: str, *args: Any, **kwargs: Any
) -> Tuple[numpy.ndarray, numpy.ndarray]:
url = self._get_band_url(band)
with self.reader(url, **self.reader_options) as cog:
return cog.tile(*args, **kwargs)
data, mask = multi_arrays(
bands,
_reader,
tile_x,
tile_y,
tile_z,
expression=band_expression,
**kwargs,
)
if expression:
blocks = expression.split(",")
data = apply_expression(blocks, bands, data)
return data, mask
def part(
self,
bbox: Tuple[float, float, float, float],
bands: Union[Sequence[str], str] = None,
expression: Optional[str] = "",
band_expression: Optional[
str
] = "", # Expression for each band based on index names
**kwargs: Any,
) -> Tuple[numpy.ndarray, numpy.ndarray]:
"""Read part of multiple bands."""
if isinstance(bands, str):
bands = (bands,)
if bands and expression:
warnings.warn(
"Both expression and bands passed; expression will overwrite bands parameter.",
ExpressionMixingWarning,
)
if expression:
bands = self.parse_expression(expression)
if not bands:
raise MissingBands(
"bands must be passed either via expression or bands options."
)
def _reader(
band: str, *args: Any, **kwargs: Any
) -> Tuple[numpy.ndarray, numpy.ndarray]:
url = self._get_band_url(band)
with self.reader(url, **self.reader_options) as cog: # type: ignore
return cog.part(*args, **kwargs)
data, mask = multi_arrays(
bands, _reader, bbox, expression=band_expression, **kwargs,
)
if expression:
blocks = expression.split(",")
data = apply_expression(blocks, bands, data)
return data, mask
def preview(
self,
bands: Union[Sequence[str], str] = None,
expression: Optional[str] = "",
band_expression: Optional[
str
] = "", # Expression for each band based on index names
**kwargs: Any,
) -> Tuple[numpy.ndarray, numpy.ndarray]:
"""Return a preview from multiple bands."""
if isinstance(bands, str):
bands = (bands,)
if bands and expression:
warnings.warn(
"Both expression and bands passed; expression will overwrite bands parameter.",
ExpressionMixingWarning,
)
if expression:
bands = self.parse_expression(expression)
if not bands:
raise MissingBands(
"bands must be passed either via expression or bands options."
)
def _reader(band: str, **kwargs: Any) -> Tuple[numpy.ndarray, numpy.ndarray]:
url = self._get_band_url(band)
with self.reader(url, **self.reader_options) as cog: # type: ignore
return cog.preview(**kwargs)
data, mask = multi_arrays(bands, _reader, expression=band_expression, **kwargs)
if expression:
blocks = expression.split(",")
data = apply_expression(blocks, bands, data)
return data, mask
def point(
self,
lon: float,
lat: float,
bands: Union[Sequence[str], str] = None,
expression: Optional[str] = "",
band_expression: Optional[
str
] = "", # Expression for each band based on index names (b1, b2, ...)
**kwargs: Any,
) -> List:
"""Read a pixel values from multiple bands,"""
if isinstance(bands, str):
bands = (bands,)
if bands and expression:
warnings.warn(
"Both expression and bands passed; expression will overwrite bands parameter.",
ExpressionMixingWarning,
)
if expression:
bands = self.parse_expression(expression)
if not bands:
raise MissingBands(
"bands must be passed either via expression or bands options."
)
def _reader(band: str, *args, **kwargs: Any) -> Dict:
url = self._get_band_url(band)
with self.reader(url, **self.reader_options) as cog: # type: ignore
return cog.point(*args, **kwargs)[0] # We only return the firt value
data = multi_values(
bands, _reader, lon, lat, expression=band_expression, **kwargs,
)
values = [d for _, d in data.items()]
if expression:
blocks = expression.split(",")
values = apply_expression(blocks, bands, values).tolist()
return values
@attr.s
class GCPCOGReader(COGReader):
"""Custom COG Reader with GCPS support.
Attributes:
src_dataset (DatasetReader): rasterio openned dataset.
dataset (WarpedVRT): rasterio WarpedVRT dataset.
"""
def __attrs_post_init__(self):
"""Define _kwargs, open dataset and get info."""
if self.nodata is not None:
self._kwargs["nodata"] = self.nodata
if self.unscale is not None:
self._kwargs["unscale"] = self.unscale
if self.resampling_method is not None:
self._kwargs["resampling_method"] = self.resampling_method
if self.vrt_options is not None:
self._kwargs["vrt_options"] = self.vrt_options
if self.post_process is not None:
self._kwargs["post_process"] = self.post_process
self.src_dataset = rasterio.open(self.filepath)
self.dataset = WarpedVRT(
self.src_dataset,
src_crs=self.src_dataset.gcps[1],
src_transform=transform.from_gcps(self.src_dataset.gcps[0]),
src_nodata=0,
)
self.bounds = transform_bounds(
self.dataset.crs, constants.WGS84_CRS, *self.dataset.bounds, densify_pts=21
)
if self.minzoom is None or self.maxzoom is None:
self._get_zooms()
if self.colormap is None:
self._get_colormap()
return self
def close(self):
"""Close rasterio dataset."""
self.dataset.close()
self.src_dataset.close()