# This file is part of the Open Data Cube, see https://opendatacube.org for more information
#
# Copyright (c) 2015-2020 ODC Contributors
# SPDX-License-Identifier: Apache-2.0
import importlib
import itertools
import math
from collections import OrderedDict, namedtuple
from enum import Enum
from typing import (
Dict,
Iterable,
List,
Literal,
Mapping,
Optional,
Sequence,
Tuple,
Union,
)
import numpy
from affine import Affine
from . import geom
from .crs import CRS, MaybeCRS, SomeCRS, norm_crs
from .geom import BoundingBox, Geometry, bbox_intersection, bbox_union, intersects
from .math import (
clamp,
is_affine_st,
is_almost_int,
maybe_zero,
resolution_from_affine,
snap_grid,
split_translation,
)
from .roi import (
RoiTiles,
align_up,
clip_tiles,
roi_boundary,
roi_normalise,
roi_shape,
roi_tiles,
)
from .types import (
ROI,
XY,
Chunks2d,
MaybeInt,
NormalizedROI,
OutlineMode,
Resolution,
Shape2d,
SomeIndex2d,
SomeResolution,
SomeShape,
Unset,
func2map,
res_,
shape_,
xy_,
)
[docs]class AnchorEnum(Enum):
"""
Defines which way to snap geobox pixel grid.
"""
EDGE = 0
"""Snap pixel edges to multiples of pixel size."""
CENTER = 1
"""Snap pixel centers to multiples of pixel size."""
FLOATING = 2
"""Turn off pixel snapping."""
GeoboxAnchor = Union[AnchorEnum, XY[float]]
# pylint: disable=invalid-name,too-many-public-methods,too-many-lines
Coordinate = namedtuple("Coordinate", ("values", "units", "resolution"))
class GeoBoxBase:
"""
Defines the location and resolution of a rectangular grid of data,
including it's :py:class:`~odc.geo.crs.CRS`.
:param shape: Shape in pixels ``(ny, nx)``
:param crs: Coordinate Reference System
:param affine: Affine transformation defining the location of the geobox
"""
__slots__ = ("_shape", "_affine", "_crs", "_extent", "_lazy_ui")
def __init__(self, shape: SomeShape, affine: Affine, crs: MaybeCRS):
shape = shape_(shape)
self._shape = shape
self._affine = affine
self._crs = norm_crs(crs)
self._extent: Optional[Geometry] = None
self._lazy_ui = None
@property
def width(self) -> int:
"""Width in pixels (nx)."""
return self._shape.x
@property
def height(self) -> int:
"""Height in pixels (ny)."""
return self._shape.y
@property
def shape(self) -> Shape2d:
"""Shape in pixels ``(height, width)``."""
return self._shape
@property
def aspect(self) -> float:
"""Aspect ratio (X/Y in pixel space)."""
return self._shape.aspect
@property
def crs(self) -> Optional[CRS]:
"""Coordinate Reference System of the GeoBox."""
return self._crs
@property
def dimensions(self) -> Tuple[str, str]:
"""List of dimension names of the GeoBox."""
crs = self._crs
if crs is None:
return ("y", "x")
return crs.dimensions
dims = dimensions
def is_empty(self) -> bool:
"""Check if geobox is "empty"."""
return 0 in self._shape
def __bool__(self) -> bool:
return not self.is_empty()
@property
def resolution(self) -> Resolution:
"""Resolution, pixel size in CRS units."""
return resolution_from_affine(self._affine)
def boundary(self, pts_per_side: int = 16) -> numpy.ndarray:
"""
Boundary of a :py:class:`~odc.geo.geobox.GeoBox`.
Construct a ring of points in pixel space along the edge of the geobox.
:param pts_per_side: Number of points per side, default is 16.
:return:
Points in pixel space along the perimeter of a GeoBox as a ``Nx2`` array
in pixel coordinates.
"""
ny, nx = self._shape.yx
return roi_boundary(numpy.s_[0:ny, 0:nx], pts_per_side)
@property
def alignment(self) -> XY[float]:
"""
Alignment of pixel boundaries in CRS units.
This is usally ``(0,0)``.
"""
rx, _, tx, _, ry, ty, *_ = self._affine
return xy_(tx % abs(rx), ty % abs(ry))
@property
def linear(self) -> bool:
return True
def wld2pix(self, x, y):
return (~self._affine) * (x, y)
def pix2wld(self, x, y):
return self._affine * (x, y)
@property
def extent(self) -> Geometry:
"""GeoBox footprint in native CRS."""
if self._extent is not None:
return self._extent
if self.linear:
_extent = geom.polygon_from_transform(self._shape, self._affine, self._crs)
else:
_extent = geom.polygon(self.boundary(16).tolist(), self._crs).transform(
self.pix2wld
)
self._extent = _extent
return _extent
@property
def boundingbox(self) -> BoundingBox:
"""GeoBox bounding box in the native CRS."""
return BoundingBox.from_transform(self._shape, self._affine, crs=self._crs)
def _reproject_resolution(self, npoints: int = 100):
bbox = self.extent.boundingbox
span = max(bbox.span_x, bbox.span_y)
return span / npoints
def footprint(
self, crs: SomeCRS, buffer: float = 0, npoints: int = 100
) -> Geometry:
"""
Compute footprint in foreign CRS.
:param crs: CRS of the destination
:param buffer: amount to buffer in source pixels before transforming
:param npoints: number of points per-side to use, higher number
is slower but more accurate
"""
assert self.crs is not None
ext = self.extent
if buffer > 0:
buffer = buffer * max(*self.resolution.xy)
ext = ext.buffer(buffer)
return ext.to_crs(crs, resolution=self._reproject_resolution(npoints)).dropna()
@property
def geographic_extent(self) -> Geometry:
"""GeoBox extent in EPSG:4326."""
if self._crs is None or self._crs.geographic:
return self.extent
return self.footprint("epsg:4326")
@property
def _ui(self):
# pylint: disable=import-outside-toplevel
from .ui import PixelGridDisplay
if self._lazy_ui is not None:
return self._lazy_ui
gsd = max(*self.resolution.map(abs).xy)
self._lazy_ui = PixelGridDisplay(self, self.pix2wld, gsd)
return self._lazy_ui
def svg(
self,
scale_factor: float = 1.0,
mode: OutlineMode = "auto",
notch: float = 0.0,
grid_stroke: str = "pink",
) -> str:
"""
Produce SVG paths.
:param mode: One of pixel, native, geo (default is geo)
:return: SVG path
"""
return self._ui.svg(
scale_factor=scale_factor, mode=mode, notch=notch, grid_stroke=grid_stroke
)
def grid_lines(self, step: int = 0, mode: OutlineMode = "native") -> Geometry:
"""
Construct pixel edge aligned grid lines.
"""
return self._ui.grid_lines(step=step, mode=mode)
def outline(self, mode: OutlineMode = "native", notch: float = 0.1) -> Geometry:
return self._ui.outline(mode, notch=notch)
def _repr_svg_(self):
# pylint: disable=protected-access
return self._ui._render_svg()
def _repr_html_(self):
# pylint: disable=protected-access
return self._ui._repr_html_()
def compute_crop(self, roi) -> Tuple[Shape2d, Affine]:
if isinstance(roi, BoundingBox):
roi = roi.polygon
if isinstance(roi, GeoBoxBase):
roi = roi.extent
if isinstance(roi, Geometry):
if roi.crs is not None:
roi = self.project(roi)
pix_bbox = roi.boundingbox.round() & BoundingBox(
0, 0, self.width, self.height
)
nx, ny = (max(1, int(span)) for span in (pix_bbox.span_x, pix_bbox.span_y))
tx, ty = map(int, pix_bbox.bbox[:2])
roi = numpy.s_[ty : ty + ny, tx : tx + nx]
if isinstance(roi, int):
roi = (slice(roi, roi + 1), slice(None, None))
if isinstance(roi, slice):
roi = (roi, slice(None, None))
if len(roi) > 2:
raise ValueError("Expect 2d slice")
roi = roi_normalise(roi, self._shape.shape)
if not all(s.step is None or s.step == 1 for s in roi):
raise NotImplementedError("scaling not implemented, yet")
ty, tx = (s.start for s in roi)
ny, nx = roi_shape(roi)
affine = self._affine * Affine.translation(tx, ty)
return shape_((ny, nx)), affine
def compute_zoom_out(self, factor: float) -> Tuple[Shape2d, Affine]:
ny, nx = (max(1, math.ceil(s / factor)) for s in self.shape)
A = self._affine * Affine.scale(factor, factor)
return (shape_((ny, nx)), A)
def compute_zoom_to(
self,
shape: Union[SomeShape, int, float, None] = None,
*,
resolution: Optional[SomeResolution] = None,
) -> Tuple[Shape2d, Affine]:
"""
Change GeoBox shape.
When supplied a single integer scale longest dimension to match that.
:returns:
GeoBox covering the same region but with different number of pixels and therefore resolution.
"""
if shape is None:
if resolution is None:
raise ValueError("Have to supply shape or resolution")
new_geobox = GeoBox.from_bbox(
self.boundingbox, resolution=resolution, tight=True
)
return new_geobox.shape, new_geobox.affine
if isinstance(shape, (int, float)):
nmax = max(*self._shape)
return self.compute_zoom_out(nmax / shape)
shape = shape_(shape)
sy, sx = (N / float(n) for N, n in zip(self._shape, shape.shape))
A = self._affine * Affine.scale(sx, sy)
return (shape, A)
def project(self, g: Geometry) -> Geometry:
"""
Map Geometry between world and pixel coords.
When input geometry has no CRS, map from pixels to the world.
When input geometry has CRS (can be different from GeoBox), project
geometry into pixel coordinates, note that result is not clipped to the
image bounds.
"""
if g.crs is None: # assume pixel plane
g = g.transform(self.pix2wld)
return Geometry(g.geom, self._crs)
assert self._crs is not None
if g.crs != self._crs:
g = g.to_crs(self._crs)
g = g.transform(self.wld2pix)
return Geometry(g.geom, crs=None)
def qr2sample(
self,
n: int,
padding: Optional[float] = None,
with_edges: bool = False,
offset: int = 0,
) -> Geometry:
"""
Generate quasi-random sample of image locations.
:param n:
Number of points
:param padding:
In pixels, minimal distance from the edge
:param offset:
Offset into quasi-random sequence from where to start
:param edges:
Also include samples along the edge and corners
References: http://extremelearning.com.au/unreasonable-effectiveness-of-quasirandom-sequences/
"""
nx, ny = self._shape.xy
return BoundingBox(0, 0, nx, ny, None).qr2sample(
n, padding=padding, with_edges=with_edges, offset=offset
)
def __getitem__(self, roi) -> "GeoBoxBase":
raise NotImplementedError()
[docs]class GeoBox(GeoBoxBase):
"""
Defines the location and resolution of a rectangular grid of data,
including it's :py:class:`~odc.geo.crs.CRS`.
:param shape: Shape in pixels ``(ny, nx)``
:param crs: Coordinate Reference System
:param affine: Affine transformation defining the location of the geobox
"""
__slots__ = ()
[docs] def __init__(self, shape: SomeShape, affine: Affine, crs: MaybeCRS):
GeoBoxBase.__init__(self, shape, affine, crs)
[docs] @staticmethod
def from_bbox(
bbox: Union[BoundingBox, Tuple[float, float, float, float]],
crs: MaybeCRS = None,
*,
tight: bool = False,
shape: Union[SomeShape, int, None] = None,
resolution: Optional[SomeResolution] = None,
anchor: GeoboxAnchor = AnchorEnum.EDGE,
tol: float = 0.01,
) -> "GeoBox":
"""
Construct :py:class:`~odc.geo.geobox.GeoBox` from a bounding box.
:param bbox: Bounding box in CRS units, lonlat is assumed when ``crs`` is not supplied
:param crs: CRS of the bounding box (defaults to EPSG:4326)
:param shape:
Span that many pixels, if it's a single number then span that many pixels along the
longest dimension, other dimension will be computed to maintain roughly square pixels.
:param resolution: Use specified resolution
:param tight: Supplying ``tight=True`` turns off pixel snapping.
:param anchor:
By default snaps grid such that pixel edges fall on X/Y axis. Ignored when tight mode is
used.
:param tol:
Fraction of a pixel that can be ignored, defaults to 1/100. Bounding box of the output
geobox is allowed to be smaller than supplied bounding box by that amount.
:return:
:py:class:`~odc.geo.geobox.GeoBox` that covers supplied bounding box.
"""
# pylint: disable=too-many-locals, too-many-branches
_snap: Optional[XY[float]] = None
if tight:
anchor = AnchorEnum.FLOATING
if isinstance(anchor, XY):
_snap = anchor
if anchor == AnchorEnum.EDGE:
_snap = xy_(0, 0)
elif anchor == AnchorEnum.CENTER:
_snap = xy_(0.5, 0.5)
def _norm_bbox(
bbox: Tuple[float, float, float, float], crs: MaybeCRS
) -> BoundingBox:
if isinstance(crs, str):
if crs.lower().startswith("utm"):
return BoundingBox(*bbox, crs="epsg:4326").to_crs(crs)
return BoundingBox(*bbox, crs=(crs or "epsg:4326"))
if not isinstance(bbox, BoundingBox):
bbox = _norm_bbox(bbox, crs)
elif bbox.crs is None:
bbox = _norm_bbox(bbox.bbox, crs)
if isinstance(shape, (int, float)):
if bbox.aspect > 1:
resolution = bbox.span_x / shape
else:
resolution = bbox.span_y / shape
shape = None
if resolution is not None:
rx, ry = res_(resolution).xy
if _snap is None:
offx, nx = snap_grid(bbox.left, bbox.right, rx, None, tol=tol)
offy, ny = snap_grid(bbox.bottom, bbox.top, ry, None, tol=tol)
else:
offx, nx = snap_grid(bbox.left, bbox.right, rx, _snap.x, tol=tol)
offy, ny = snap_grid(bbox.bottom, bbox.top, ry, _snap.y, tol=tol)
affine = Affine.translation(offx, offy) * Affine.scale(rx, ry)
return GeoBox((ny, nx), crs=bbox.crs, affine=affine)
if shape is None:
raise ValueError("Must supply shape or resolution")
shape = shape_(shape)
nx, ny = shape.wh
rx = bbox.span_x / nx
ry = -bbox.span_y / ny
if _snap is None:
offx, offy = bbox.left, bbox.top
else:
offx, _ = snap_grid(bbox.left, bbox.right, rx, _snap.x, tol=tol)
offy, _ = snap_grid(bbox.bottom, bbox.top, ry, _snap.y, tol=tol)
affine = Affine.translation(offx, offy) * Affine.scale(rx, ry)
return GeoBox((ny, nx), crs=bbox.crs, affine=affine)
[docs] @staticmethod
def from_geopolygon(
geopolygon: Geometry,
resolution: Optional[SomeResolution] = None,
crs: MaybeCRS = None,
align: Optional[XY[float]] = None,
*,
shape: Union[SomeShape, int, None] = None,
tight: bool = False,
anchor: GeoboxAnchor = AnchorEnum.EDGE,
tol: float = 0.01,
) -> "GeoBox":
"""
Construct :py:class:`~odc.geo.geobox.GeoBox` from a polygon.
:param resolution:
Either a single number or a :py:class:`~odc.geo.types.Resolution` object.
:param shape:
Span that many pixels, if it's a single number then span that many pixels along the
longest dimension, other dimension will be computed to maintain roughly square pixels.
:param crs:
CRS to use, if different from the geopolygon
:param align:
Deprecated: please switch to ``anchor=``
:param anchor:
By default snaps grid such that pixel edges fall on X/Y axis.
:param tol:
Fraction of a pixel that can be ignored, defaults to 1/100. Bounding box of the output
geobox is allowed to be smaller than supplied bounding box by that amount.
:param tight: Supplying ``tight=True`` turns off pixel snapping.
"""
if align is not None:
# support old-style "align", which is basically anchor but in CRS units
ax, ay = align.xy
if ax == 0 and ay == 0:
anchor = AnchorEnum.EDGE
else:
assert resolution is not None
resolution = res_(resolution)
anchor = xy_(ax / abs(resolution.x), ay / abs(resolution.y))
if crs is None or isinstance(crs, Unset):
crs = geopolygon.crs
else:
geopolygon = geopolygon.to_crs(crs)
return GeoBox.from_bbox(
geopolygon.boundingbox,
crs,
shape=shape,
resolution=resolution,
anchor=anchor,
tol=tol,
tight=tight,
)
@staticmethod
def from_rio(rdr) -> "GeoBox":
"""
Construct GeoBox from rasterio.
:param rdr: Openned :py:class:`rasterio.DatasetReader`
:returns:
:py:class:`~odc.geo.geobox.GeoBox`
"""
return GeoBox(rdr.shape, rdr.transform, rdr.crs)
[docs] def buffered(self, xbuff: float, ybuff: Optional[float] = None) -> "GeoBox":
"""
Produce a tile buffered by ``xbuff, ybuff`` (in CRS units).
"""
if ybuff is None:
ybuff = xbuff
by, bx = (
_round_to_res(buf, res)
for buf, res in zip((ybuff, xbuff), self.resolution.yx)
)
affine = self._affine * Affine.translation(-bx, -by)
ny, nx = (sz + 2 * b for sz, b in zip(self._shape, (by, bx)))
return GeoBox(
(ny, nx),
affine=affine,
crs=self._crs,
)
[docs] def enclosing(self, region: Union[Geometry, BoundingBox]) -> "GeoBox":
"""
Construct compatible geobox covering given ``region``.
Output GeoBox shares exactly the same pixel grid as source, but has
different shape and location in the world.
:param region: Region to be covered by the new GeoBox.
"""
if isinstance(region, BoundingBox):
region = region.polygon
if region.crs is None:
raise ValueError("Must supply geo-resgistered region")
pix_bbox = self.project(region).boundingbox.round()
nx, ny = (max(1, int(span)) for span in (pix_bbox.span_x, pix_bbox.span_y))
tx, ty, *_ = pix_bbox.bbox
A = self.translate_pix(tx, ty).affine
return GeoBox(shape_((ny, nx)), A, self._crs)
def __getitem__(self, roi) -> "GeoBox":
_shape, _affine = self.compute_crop(roi)
return GeoBox(shape=_shape, affine=_affine, crs=self._crs)
def __or__(self, other) -> "GeoBox":
"""A geobox that encompasses both self and other."""
return geobox_union_conservative([self, other])
def __and__(self, other) -> "GeoBox":
"""A geobox that is contained in both self and other."""
return geobox_intersection_conservative([self, other])
def __hash__(self):
return hash((*self._shape, self._crs, self._affine))
[docs] def overlap_roi(self, other: "GeoBox", tol: float = 1e-8) -> NormalizedROI:
"""
Compute overlap as ROI.
Figure out slice into this geobox that shares pixels with the ``other`` geobox with
consistent pixel grid.
:raises:
:py:class:`ValueError` when two geoboxes are not pixel-aligned.
"""
nx, ny = self._shape.xy
x0, y0, x1, y1 = map(int, bounding_box_in_pixel_domain(other, self, tol))
x0, y0 = max(0, x0), max(0, y0)
x1, y1 = min(x1, nx), min(y1, ny)
return numpy.s_[y0:y1, x0:x1]
@property
def transform(self) -> Affine:
"""Linear mapping from pixel space to CRS."""
return self._affine
@property
def affine(self) -> Affine:
"""
Linear mapping from pixel space to CRS.
alias for :py:attr:`~odc.geo.geobox.GeoBox.transform`
"""
return self._affine
@property
def coordinates(self) -> Dict[str, Coordinate]:
"""
Query coordinates.
This method only works with axis-aligned boxes. It will raise :py:class:`ValueError` if called
on non-axis aligned :py:class:`~odc.geo.geobox.GeoBox`.
:raises: :py:class:`ValueError` if not axis aligned.
:return:
Mapping from coordinate name to :py:class:`~odc.geo.geobox.Coordinate`.
"""
self._confirm_axis_aligned("Only axis aligned GeoBox can do this.")
rx, _, tx, _, ry, ty, *_ = self._affine
ny, nx = self._shape
xs = numpy.arange(nx) * rx + (tx + rx / 2)
ys = numpy.arange(ny) * ry + (ty + ry / 2)
crs_units = self._crs.units if self._crs is not None else ("1", "1")
return OrderedDict(
(dim, Coordinate(labels, units, res))
for dim, labels, units, res in zip(
self.dimensions, (ys, xs), crs_units, (ry, rx)
)
)
coords = coordinates
[docs] def map_bounds(self) -> Tuple[Tuple[float, float], Tuple[float, float]]:
"""
Query bounds in folium/ipyleaflet style.
Returns SW, and NE corners in lat/lon order.
``((lat_w, lon_s), (lat_e, lon_n))``.
"""
if self._crs is not None:
(x0, y0), _, (x1, y1) = self.extent.exterior.to_crs("epsg:4326").points[:3]
else:
(x0, y0), _, (x1, y1) = self.extent.exterior.points[:3]
return (y0, x0), (y1, x1)
[docs] def to_crs(
self,
crs: SomeCRS,
*,
resolution: Literal["auto", "fit", "same"] = "auto",
tight: bool = False,
) -> "GeoBox":
"""
Compute GeoBox covering the same region in a different projection.
:param crs:
Desired CRS of the output
:param resolution:
* "same" use exactly the same resolution as src
* "fit" use center pixel to determine scale change between the two
* | "auto" is to use the same resolution on the output if CRS units are the same
| between the source and destination and otherwise use "fit"
:param tight:
By default output pixel grid is adjusted to align pixel edges to X/Y axis, suppling
``tight=True`` produces unaligned geobox on the output.
:return:
Similar resolution, axis aligned geobox that fully encloses this one but in a different
projection.
"""
# pylint: disable=import-outside-toplevel
# can't be up-top due to circular imports issues
from .overlap import compute_output_geobox
return compute_output_geobox(self, crs, resolution=resolution, tight=tight)
def __str__(self):
return self.__repr__()
def __repr__(self):
return f"GeoBox({self._shape.yx!r}, {self._affine!r}, {self._crs!r})"
def __eq__(self, other):
if not isinstance(other, GeoBox):
return False
return (
self._shape == other._shape
and self._affine == other._affine
and self._crs == other._crs
)
[docs] def __rmul__(self, transform: Affine) -> "GeoBox":
"""
Apply affine transform on CRS side.
This has effect of transforming footprint of the source via ``transform``.
:param transform:
Affine matrix that shifts footprint of the source geobox.
:return:
:py:class:`~odc.geo.gebox.GeoBox` of the same pixel shape but
covering different region.
"""
return GeoBox(self._shape, transform * self._affine, self._crs)
[docs] def __mul__(self, transform: Affine) -> "GeoBox":
"""
Apply affine transform on pixel side.
``X_old_pix = transform * X_new_pix``
:param transform:
Affine matrix mapping from new pixel coordinate space to pixel coordinate
space of input geobox.
:returns:
:py:class:`~odc.geo.gebox.GeoBox` of the same pixel shape but covering different
region. Pixel coordinates in the output relate to input coordinates via ``transform``.
"""
return GeoBox(self._shape, self._affine * transform, self._crs)
[docs] def snap_to(self, other: "GeoBox") -> "GeoBox":
"""
Snap pixel grid to ``other``.
Find smallest sub-pixel translation to apply to this geobox such that
pixel edges align with ``other``.
:param other: GeoBox to snap to, must be related by translation only, no
change in scale or rotation.
:raises: ``ValueError`` when ``other`` is in a different projection or
has different resolution or orientation.
"""
_, subpix = split_translation(pixel_translation(other, self))
tx, ty = subpix.map(lambda x: maybe_zero(x, 1e-8)).xy
return self.translate_pix(tx, ty)
[docs] def pad(self, padx: int, pady: MaybeInt = None) -> "GeoBox":
"""
Pad geobox.
Expand GeoBox by fixed number of pixels on each side
"""
# false positive for -pady, it's never None by the time it runs
# pylint: disable=invalid-unary-operand-type
pady = padx if pady is None else pady
ny, nx = self._shape.yx
A = self._affine * Affine.translation(-padx, -pady)
shape = (ny + pady * 2, nx + padx * 2)
return GeoBox(shape, A, self._crs)
[docs] def pad_wh(self, alignx: int = 16, aligny: MaybeInt = None) -> "GeoBox":
"""
Possibly expand :py:class:`~odc.geo.geobox.GeoBox` by a few pixels.
Find nearest ``width``/``height`` that are multiples of the desired factor. And return a new
geobox that is slighly taller and/or wider covering roughly the same region. The new geobox
will have the same CRS and transform but possibly larger shape.
"""
aligny = alignx if aligny is None else aligny
ny, nx = (align_up(sz, n) for sz, n in zip(self._shape.yx, (aligny, alignx)))
return GeoBox((ny, nx), self._affine, self._crs)
[docs] def zoom_out(self, factor: float) -> "GeoBox":
"""
Compute :py:class:`~odc.geo.geobox.GeoBox` with changed resolution.
- ``factor > 1`` implies smaller width/height, fewer but bigger pixels
- ``factor < 1`` implies bigger width/height, more but smaller pixels
:returns:
GeoBox covering the same region but with different pixels (i.e. lower or higher resolution)
"""
_shape, _affine = self.compute_zoom_out(factor)
return GeoBox(_shape, _affine, self._crs)
[docs] def zoom_to(
self,
shape: Union[SomeShape, int, float, None] = None,
*,
resolution: Optional[SomeResolution] = None,
) -> "GeoBox":
"""
Change GeoBox shape.
When supplied a single integer scale longest dimension to match that.
:returns:
GeoBox covering the same region but with different number of pixels and therefore resolution.
"""
_shape, _affine = self.compute_zoom_to(shape, resolution=resolution)
return GeoBox(_shape, _affine, self._crs)
[docs] def flipy(self) -> "GeoBox":
"""
Flip along Y axis.
:returns: GeoBox covering the same region but with Y-axis flipped
"""
ny, _ = self._shape
A = Affine.translation(0, ny) * Affine.scale(1, -1)
return self * A
[docs] def flipx(self) -> "GeoBox":
"""
Flip along X axis.
:returns: GeoBox covering the same region but with X-axis flipped
"""
_, nx = self._shape
A = Affine.translation(nx, 0) * Affine.scale(-1, 1)
return self * A
[docs] def translate_pix(self, tx: float, ty: float) -> "GeoBox":
"""
Shift GeoBox in pixel plane.
``(0,0)`` of the new GeoBox will be at the same location as pixel ``(tx, ty)`` in the original
GeoBox.
"""
return self * Affine.translation(tx, ty)
@property
def left(self) -> "GeoBox":
"""Same size geobox to the left of this one."""
return self.translate_pix(-self.shape.x, 0)
@property
def right(self) -> "GeoBox":
"""Same size geobox to the right of this one."""
return self.translate_pix(self.shape.x, 0)
@property
def top(self) -> "GeoBox":
"""Same size geobox directly above this one."""
return self.translate_pix(0, -self.shape.y)
@property
def bottom(self) -> "GeoBox":
"""Same size geobox directly below this one."""
return self.translate_pix(0, self.shape.y)
[docs] def rotate(self, deg: float) -> "GeoBox":
"""
Rotate GeoBox around the center.
It's as if you stick a needle through the center of the GeoBox footprint
and rotate it counter clock wise by supplied number of degrees.
Note that from the pixel point of view image rotates the other way. If you have
source image with an arrow pointing right, and you rotate GeoBox 90 degrees,
in that view arrow should point down (this is assuming usual case of inverted
y-axis)
"""
ny, nx = self._shape
c0 = self._affine * (nx * 0.5, ny * 0.5)
return Affine.rotation(deg, c0) * self
def _confirm_axis_aligned(self, raise_error: Optional[str] = None) -> bool:
if is_affine_st(self._affine):
return True
if raise_error is not None:
raise ValueError(raise_error)
return False
@property
def axis_aligned(self):
"""
Check if Geobox is axis-aligned (not rotated).
"""
return self._confirm_axis_aligned()
@property
def center_pixel(self) -> "GeoBox":
"""
GeoBox of a center pixel.
"""
return self[self.shape.map(lambda x: x // 2).yx]
@property
def compat(self):
"""
Convert to :py:class:`datacube.utils.geometry.GeoBox`
"""
try:
dc_geom = importlib.import_module("datacube.utils.geometry")
except ModuleNotFoundError:
return None
w, h = self.shape.wh
return dc_geom.GeoBox(w, h, self._affine, str(self._crs))
def __dask_tokenize__(self):
return (
"odc.geo.geobox.GeoBox",
str(self.crs),
*self._shape.yx,
*self._affine[:6],
)
[docs]def gbox_boundary(gbox: GeoBoxBase, pts_per_side: int = 16) -> numpy.ndarray:
"""Alias for :py:meth:`odc.geo.geobox.GeoBox.boundary`."""
return gbox.boundary(pts_per_side)
def pixel_translation(a: GeoBox, b: GeoBox) -> XY[float]:
"""
Compute pixel translation ``a -> b``.
Both geoboxes should have the same CRS and resolution.
"""
if a.crs != b.crs:
raise ValueError("Geobox CRSs must match")
# compute pixel-to-pixel transform
# expect it to be a pure, pixel aligned translation
# 1 0 tx
# 0 1 ty
# 0 0 1
# Such that tx,ty are almost integer.
sx, z1, tx, z2, sy, ty, *_ = ~b.affine * a.affine
if not (
numpy.isclose(sx, 1)
and numpy.isclose(z1, 0)
and numpy.isclose(z2, 0)
and numpy.isclose(sy, 1)
):
raise ValueError("Incompatible grids")
return xy_(tx, ty)
[docs]def bounding_box_in_pixel_domain(
geobox: GeoBox, reference: GeoBox, tol: float = 1e-8
) -> BoundingBox:
"""
Bounding box of ``geobox`` in pixel space of ``reference``.
:return:
The bounding box of ``geobox`` with respect to the pixel grid defined by ``reference`` when
their coordinate grids are compatible. Two geoboxes are compatible when they have the same
CRS, same pixel size and orientation, and are related by whole pixel translation.
:raises:
:py:class:`ValueError` when two geoboxes are not pixel-aligned.
"""
# offset of ``geobox`` in ``reference`` pixels
tx, ty = pixel_translation(geobox, reference).xy
if not (is_almost_int(tx, tol) and is_almost_int(ty, tol)):
raise ValueError("Incompatible grids")
tx, ty = round(tx), round(ty)
ny, nx = geobox.shape
return BoundingBox(tx, ty, tx + nx, ty + ny, None)
[docs]def geobox_union_conservative(geoboxes: List[GeoBox]) -> GeoBox:
"""
Union of geoboxes as a geobox.
Fails whenever incompatible grids are encountered.
"""
if len(geoboxes) == 0:
raise ValueError("No geoboxes supplied")
reference, *_ = geoboxes
bbox = bbox_union(
bounding_box_in_pixel_domain(geobox, reference=reference) for geobox in geoboxes
)
affine = reference.affine * Affine.translation(*bbox[:2])
return GeoBox(shape=bbox.shape, affine=affine, crs=reference.crs)
[docs]def geobox_intersection_conservative(geoboxes: List[GeoBox]) -> GeoBox:
"""
Intersection of geoboxes.
Fails whenever incompatible grids are encountered.
"""
if len(geoboxes) == 0:
raise ValueError("No geoboxes supplied")
reference, *_ = geoboxes
bbox = bbox_intersection(
bounding_box_in_pixel_domain(geobox, reference=reference) for geobox in geoboxes
)
# standardise empty geobox representation
if bbox.left > bbox.right:
bbox = BoundingBox(
left=bbox.left,
bottom=bbox.bottom,
right=bbox.left,
top=bbox.top,
crs=bbox.crs,
)
if bbox.bottom > bbox.top:
bbox = BoundingBox(
left=bbox.left,
bottom=bbox.bottom,
right=bbox.right,
top=bbox.bottom,
crs=bbox.crs,
)
affine = reference.affine * Affine.translation(*bbox[:2])
return GeoBox(shape=bbox.shape, affine=affine, crs=reference.crs)
[docs]def scaled_down_geobox(src_geobox: GeoBox, scaler: int) -> GeoBox:
"""
Compute :py:class:`~odc.geo.geobox.GeoBox` of a zoomed image.
Given a source geobox and an integer scaler compute geobox of a scaled down image.
Output geobox will be padded when shape is not a multiple of scaler.
Example: ``5x4, scaler=2 -> 3x2``
.. note::
We assume that pixel coordinates are ``0,0`` at the top-left corner of a top-left pixel.
"""
assert scaler > 1
ny, nx = (X // scaler + (1 if X % scaler else 0) for X in src_geobox.shape)
# Since 0,0 is at the corner of a pixel, not center, there is no
# translation between pixel plane coords due to scaling
A = src_geobox.transform * Affine.scale(scaler, scaler)
return GeoBox((ny, nx), A, src_geobox.crs)
def _round_to_res(value: float, res: float) -> int:
res = abs(res)
return int(math.ceil((value - 0.1 * res) / res))
[docs]def flipy(gbox: GeoBox) -> GeoBox:
"""Alias for :py:meth:`odc.geo.geobox.flipy`."""
return gbox.flipy()
[docs]def flipx(gbox: GeoBox) -> GeoBox:
"""Alias for :py:meth:`odc.geo.geobox.flipx`."""
return gbox.flipx()
[docs]def translate_pix(gbox: GeoBox, tx: float, ty: float) -> GeoBox:
"""Alias for :py:meth:`odc.geo.geobox.GeoBox.translate_pix`."""
return gbox.translate_pix(tx, ty)
[docs]def pad(gbox: GeoBox, padx: int, pady: MaybeInt = None) -> GeoBox:
"""Alias for :py:meth:`odc.geo.geobox.GeoBox.pad`."""
return gbox.pad(padx, pady)
[docs]def pad_wh(gbox: GeoBox, alignx: int = 16, aligny: MaybeInt = None) -> GeoBox:
"""Alias for :py:meth:`odc.geo.geobox.GeoBox.pad_wh`."""
return gbox.pad_wh(alignx, aligny)
[docs]def zoom_out(gbox: GeoBox, factor: float) -> GeoBox:
"""Alias for :py:meth:`odc.geo.geobox.GeoBox.zoom_out`."""
return gbox.zoom_out(factor)
[docs]def zoom_to(
gbox: GeoBox,
shape: Union[SomeShape, int, float, None] = None,
*,
resolution: Optional[SomeResolution] = None,
) -> GeoBox:
"""Alias for :py:meth:`odc.geo.geobox.GeoBox.zoom_to`."""
return gbox.zoom_to(shape, resolution=resolution)
[docs]def rotate(gbox: GeoBox, deg: float) -> GeoBox:
"""Alias for :py:meth:`odc.geo.geobox.GeoBox.`."""
return gbox.rotate(deg)
[docs]class GeoboxTiles:
"""Partition GeoBox into sub geoboxes."""
__slots__ = ("_gbox", "_tiles")
[docs] def __init__(
self,
box: GeoBoxBase,
tile_shape: Union[SomeShape, Chunks2d, None],
*,
_tiles: Optional[RoiTiles] = None,
):
"""
Construct from a :py:class:`~odc.geo.GeoBox`.
:param box: source :py:class:`~odc.geo.GeoBox`
:param tile_shape: Shape of sub-tiles in pixels ``(rows, cols)``
"""
self._gbox = box
if _tiles is not None:
self._tiles = _tiles
else:
assert tile_shape is not None
self._tiles = roi_tiles(box.shape, tile_shape)
@property
def base(self) -> GeoBoxBase:
"""Access base Geobox"""
return self._gbox
@property
def shape(self) -> Shape2d:
"""Number of tiles along each dimension."""
return self._tiles.shape
@property
def roi(self) -> RoiTiles:
"""
Access ROI covered by tile.
.. code-block:: python
gbt = GeoboxTiles(..)
roi = gbt.roi[0, 3]
"""
return self._tiles
[docs] def chunk_shape(self, idx: SomeIndex2d) -> Shape2d:
"""
Query chunk shape for a given chunk.
:param idx: ``(row, col)`` chunk index
:returns: ``(nrows, ncols)`` shape of a tile (edge tiles might be smaller)
:raises: :py:class:`IndexError` when index is outside of ``[(0,0) -> .shape)``.
"""
return self._tiles.tile_shape(idx)
@property
def chunks(self) -> Chunks2d:
return self._tiles.chunks
def _crop(self, roi: ROI) -> "GeoboxTiles":
gbox_new = self.base[self._tiles[roi]]
return GeoboxTiles(gbox_new, (0, 0), _tiles=self._tiles.crop(roi))
def clip(
self, selection: Sequence[Tuple[int, int]]
) -> Tuple["GeoboxTiles", List[Tuple[int, int]]]:
"""
Crop to a set of tiles.
Returns cropped version of :py:class:`GeoboxTiles` and a list of
tile coordinates in the new, cropped space.
"""
tiles, roi, new_idx = clip_tiles(self._tiles, selection)
return GeoboxTiles(self[roi], None, _tiles=tiles), new_idx
@property
def crop(self) -> Mapping[ROI, "GeoboxTiles"]:
return func2map(self._crop)
def __getitem__(self, idx: Union[SomeIndex2d, ROI]) -> GeoBoxBase:
"""
Lookup tile by index, index is in matrix access order: ``(row, col)``.
:param idx: ``(row, col)`` index
:returns: GeoBox of a tile
:raises: IndexError when index is outside of ``[(0,0) -> .shape)``
"""
return self._gbox[self._tiles[idx]]
[docs] def range_from_bbox(self, bbox: BoundingBox) -> Tuple[range, range]:
"""
Intersect with a bounding box.
Compute rows and columns overlapping with a given :py:class:`~odc.geo.geom.BoundingBox`.
"""
if bbox.crs is not None:
bbox = self._gbox.project(bbox.polygon).boundingbox
def _clamp(span: Tuple[float, float], N: int):
a1, a2 = span
a1 = int(clamp(math.floor(a1), 0, N - 1))
a2 = int(clamp(math.ceil(a2), 1, N)) - 1
return a1, a2
NY, NX = self._gbox.shape.yx
x1, x2 = _clamp(bbox.range_x, NX)
y1, y2 = _clamp(bbox.range_y, NY)
y1, x1 = self._tiles.locate((y1, x1))
y2, x2 = self._tiles.locate((y2, x2))
return range(y1, y2 + 1), range(x1, x2 + 1)
[docs] def tiles(self, polygon: Geometry) -> Iterable[Tuple[int, int]]:
"""Return tile indexes overlapping with a given geometry."""
target_crs = self._gbox.crs
poly = polygon
if target_crs is not None and poly.crs != target_crs:
poly = poly.to_crs(target_crs)
yy, xx = self.range_from_bbox(poly.boundingbox)
for idx in itertools.product(yy, xx):
gbox = self[idx]
if intersects(gbox.extent, poly):
yield idx
[docs] def grid_intersect(
self, src: "GeoboxTiles"
) -> Dict[Tuple[int, int], List[Tuple[int, int]]]:
"""
Figure out tile to tile overlap graph between two grids.
For every tile in this :py:class:`GeoboxTiles` find every tile in ``other`` that
intersects with this ``tile``.
"""
if src.base.crs == self.base.crs:
src_footprint = src.base.extent
else:
# compute "robust" source footprint in CRS of self via espg:4326
src_footprint = (
src.base.footprint(4326, 2) & self.base.footprint(4326, 2)
).to_crs(self.base.crs)
xy_chunks_with_data = list(self.tiles(src_footprint))
deps: Dict[Tuple[int, int], List[Tuple[int, int]]] = {}
for idx in xy_chunks_with_data:
geobox = self[idx]
deps[idx] = list(src.tiles(geobox.extent))
return deps
def __dask_tokenize__(self):
return (
"odc.geo.geobox.GeoboxTiles",
*self._gbox.__dask_tokenize__()[1:],
*self._tiles.__dask_tokenize__()[1:],
)
def __str__(self):
return str(self.roi)
def __eq__(self, __value: object) -> bool:
if not isinstance(__value, GeoboxTiles):
return False
if self is __value:
return True
return self._tiles == __value._tiles and self._gbox == __value._gbox
__repr__ = __str__