Source code for torchgeo.datasets.pastis
# Copyright (c) Microsoft Corporation. All rights reserved.
# Licensed under the MIT License.
"""PASTIS dataset."""
import os
from collections.abc import Sequence
from typing import Callable, Optional
import fiona
import matplotlib.pyplot as plt
import numpy as np
import torch
from matplotlib.colors import ListedColormap
from matplotlib.figure import Figure
from torch import Tensor
from .geo import NonGeoDataset
from .utils import check_integrity, download_url, extract_archive
[docs]class PASTIS(NonGeoDataset):
"""PASTIS dataset.
The `PASTIS <https://github.com/VSainteuf/pastis-benchmark>`__
dataset is a dataset for time-series panoptic segmentation of agricultural parcels.
Dataset features:
* support for the original PASTIS and PASTIS-R versions of the dataset
* 2,433 time-series with 10 m per pixel resolution (128x128 px)
* 18 crop categories, 1 background category, 1 void category
* semantic and instance annotations
* 3 Sentinel-1 Ascending bands
* 3 Sentinel-1 Descending bands
* 10 Sentinel-2 L2A multispectral bands
Dataset format:
* time-series and annotations are in numpy format (.npy)
Dataset classes:
0. Background
1. Meadow
2. Soft Winter Wheat
3. Corn
4. Winter Barley
5. Winter Rapeseed
6. Spring Barley
7. Sunflower
8. Grapevine
9. Beet
10. Winter Triticale
11. Winter Durum Wheat
12. Fruits Vegetables Flowers
13. Potatoes
14. Leguminous Fodder
15. Soybeans
16. Orchard
17. Mixed Cereal
18. Sorghum
19. Void Label
If you use this dataset in your research, please cite the following papers:
* https://doi.org/10.1109/ICCV48922.2021.00483
* https://doi.org/10.1016/j.isprsjprs.2022.03.012
.. versionadded:: 0.5
"""
classes = [
"background", # all non-agricultural land
"meadow",
"soft_winter_wheat",
"corn",
"winter_barley",
"winter_rapeseed",
"spring_barley",
"sunflower",
"grapevine",
"beet",
"winter_triticale",
"winter_durum_wheat",
"fruits_vegetables_flowers",
"potatoes",
"leguminous_fodder",
"soybeans",
"orchard",
"mixed_cereal",
"sorghum",
"void_label", # for parcels mostly outside their patch
]
cmap = {
0: (0, 0, 0, 255),
1: (174, 199, 232, 255),
2: (255, 127, 14, 255),
3: (255, 187, 120, 255),
4: (44, 160, 44, 255),
5: (152, 223, 138, 255),
6: (214, 39, 40, 255),
7: (255, 152, 150, 255),
8: (148, 103, 189, 255),
9: (197, 176, 213, 255),
10: (140, 86, 75, 255),
11: (196, 156, 148, 255),
12: (227, 119, 194, 255),
13: (247, 182, 210, 255),
14: (127, 127, 127, 255),
15: (199, 199, 199, 255),
16: (188, 189, 34, 255),
17: (219, 219, 141, 255),
18: (23, 190, 207, 255),
19: (255, 255, 255, 255),
}
directory = "PASTIS-R"
filename = "PASTIS-R.zip"
url = "https://zenodo.org/record/5735646/files/PASTIS-R.zip?download=1"
md5 = "4887513d6c2d2b07fa935d325bd53e09"
prefix = {
"s2": os.path.join("DATA_S2", "S2_"),
"s1a": os.path.join("DATA_S1A", "S1A_"),
"s1d": os.path.join("DATA_S1D", "S1D_"),
"semantic": os.path.join("ANNOTATIONS", "TARGET_"),
"instance": os.path.join("INSTANCE_ANNOTATIONS", "INSTANCES_"),
}
[docs] def __init__(
self,
root: str = "data",
folds: Sequence[int] = (1, 2, 3, 4, 5),
bands: str = "s2",
mode: str = "semantic",
transforms: Optional[Callable[[dict[str, Tensor]], dict[str, Tensor]]] = None,
download: bool = False,
checksum: bool = False,
) -> None:
"""Initialize a new PASTIS dataset instance.
Args:
root: root directory where dataset can be found
folds: a sequence of integers from 0 to 4 specifying which of the five
dataset folds to include
bands: load Sentinel-1 ascending path data (s1a), Sentinel-1 descending path
data (s1d), or Sentinel-2 data (s2)
mode: load semantic (semantic) or instance (instance) annotations
transforms: a function/transform that takes input sample and its target as
entry and returns a transformed version
download: if True, download dataset and store it in the root directory
checksum: if True, check the MD5 of the downloaded files (may be slow)
"""
for fold in folds:
assert 1 <= fold <= 5
assert bands in ["s1a", "s1d", "s2"]
assert mode in ["semantic", "instance"]
self.root = root
self.folds = folds
self.bands = bands
self.mode = mode
self.transforms = transforms
self.download = download
self.checksum = checksum
self._verify()
self.files = self._load_files()
colors = []
for i in range(len(self.cmap)):
colors.append(
(
self.cmap[i][0] / 255.0,
self.cmap[i][1] / 255.0,
self.cmap[i][2] / 255.0,
)
)
self._cmap = ListedColormap(colors)
[docs] def __getitem__(self, index: int) -> dict[str, Tensor]:
"""Return an index within the dataset.
Args:
index: index to return
Returns:
data and label at that index
"""
image = self._load_image(index)
if self.mode == "semantic":
mask = self._load_semantic_targets(index)
sample = {"image": image, "mask": mask}
elif self.mode == "instance":
mask, boxes, labels = self._load_instance_targets(index)
sample = {"image": image, "mask": mask, "boxes": boxes, "label": labels}
if self.transforms is not None:
sample = self.transforms(sample)
return sample
[docs] def __len__(self) -> int:
"""Return the number of data points in the dataset.
Returns:
length of the dataset
"""
return len(self.idxs)
def _load_image(self, index: int) -> Tensor:
"""Load a single time-series.
Args:
index: index to return
Returns:
the time-series
"""
path = self.files[index][self.bands]
array = np.load(path)
tensor = torch.from_numpy(array)
return tensor
def _load_semantic_targets(self, index: int) -> Tensor:
"""Load the target mask for a single image.
Args:
index: index to return
Returns:
the target mask
"""
# See https://github.com/VSainteuf/pastis-benchmark/blob/main/code/dataloader.py#L201 # noqa: E501
# even though the mask file is 3 bands, we just select the first band
array = np.load(self.files[index]["semantic"])[0].astype(np.uint8)
tensor = torch.from_numpy(array).long()
return tensor
def _load_instance_targets(self, index: int) -> tuple[Tensor, Tensor, Tensor]:
"""Load the instance segmentation targets for a single sample.
Args:
index: index to return
Returns:
the instance segmentation mask, box, and label for each instance
"""
mask_array = np.load(self.files[index]["semantic"])[0]
instance_array = np.load(self.files[index]["instance"])
mask_tensor = torch.from_numpy(mask_array)
instance_tensor = torch.from_numpy(instance_array)
# Convert instance mask of N instances to N binary instance masks
instance_ids = torch.unique(instance_tensor)
# Exclude a mask for unknown/background
instance_ids = instance_ids[instance_ids != 0]
instance_ids = instance_ids[:, None, None]
masks: Tensor = instance_tensor == instance_ids
# Parse labels for each instance
labels_list = []
for mask in masks:
label = mask_tensor[mask]
label = torch.unique(label)[0]
labels_list.append(label)
# Get bounding boxes for each instance
boxes_list = []
for mask in masks:
pos = torch.where(mask)
xmin = torch.min(pos[1])
xmax = torch.max(pos[1])
ymin = torch.min(pos[0])
ymax = torch.max(pos[0])
boxes_list.append([xmin, ymin, xmax, ymax])
masks = masks.to(torch.uint8)
boxes = torch.tensor(boxes_list).to(torch.float)
labels = torch.tensor(labels_list).to(torch.long)
return masks, boxes, labels
def _load_files(self) -> list[dict[str, str]]:
"""List the image and target files.
Returns:
list of dicts containing image and semantic/instance target file paths
"""
self.idxs = []
metadata_fn = os.path.join(self.root, self.directory, "metadata.geojson")
with fiona.open(metadata_fn) as f:
for row in f:
fold = int(row["properties"]["Fold"])
if fold in self.folds:
self.idxs.append(row["properties"]["ID_PATCH"])
files = []
for i in self.idxs:
path = os.path.join(self.root, self.directory, "{}") + str(i) + ".npy"
files.append(
{
"s2": path.format(self.prefix["s2"]),
"s1a": path.format(self.prefix["s1a"]),
"s1d": path.format(self.prefix["s1d"]),
"semantic": path.format(self.prefix["semantic"]),
"instance": path.format(self.prefix["instance"]),
}
)
return files
def _verify(self) -> None:
"""Verify the integrity of the dataset.
Raises:
RuntimeError: if ``download=False`` but dataset is missing or checksum fails
"""
# Check if the directory already exists
path = os.path.join(self.root, self.directory)
if os.path.exists(path):
return
# Check if zip file already exists (if so then extract)
filepath = os.path.join(self.root, self.filename)
if os.path.exists(filepath):
if self.checksum and not check_integrity(filepath, self.md5):
raise RuntimeError("Dataset found, but corrupted.")
extract_archive(filepath)
return
# Check if the user requested to download the dataset
if not self.download:
raise RuntimeError(
f"Dataset not found in `root={self.root}` and `download=False`, "
"either specify a different `root` directory or use `download=True` "
"to automatically download the dataset."
)
# Download and extract the dataset
self._download()
def _download(self) -> None:
"""Download the dataset."""
download_url(
self.url,
self.root,
filename=self.filename,
md5=self.md5 if self.checksum else None,
)
extract_archive(os.path.join(self.root, self.filename), self.root)
[docs] def plot(
self,
sample: dict[str, Tensor],
show_titles: bool = True,
suptitle: Optional[str] = None,
) -> Figure:
"""Plot a sample from the dataset.
Args:
sample: a sample returned by :meth:`__getitem__`
show_titles: flag indicating whether to show titles above each panel
suptitle: optional string to use as a suptitle
Returns:
a matplotlib Figure with the rendered sample
"""
# Keep the RGB bands and convert to T x H x W x C format
images = sample["image"][:, [2, 1, 0], :, :].numpy().transpose(0, 2, 3, 1)
mask = sample["mask"].numpy()
if self.mode == "instance":
label = sample["label"]
mask = label[mask.argmax(axis=0)].numpy()
num_panels = 3
showing_predictions = "prediction" in sample
if showing_predictions:
predictions = sample["prediction"].numpy()
num_panels += 1
if self.mode == "instance":
predictions = predictions.argmax(axis=0)
label = sample["prediction_labels"]
predictions = label[predictions].numpy()
fig, axs = plt.subplots(1, num_panels, figsize=(num_panels * 4, 4))
axs[0].imshow(images[0] / 5000)
axs[1].imshow(images[1] / 5000)
axs[2].imshow(mask, vmin=0, vmax=19, cmap=self._cmap, interpolation="none")
axs[0].axis("off")
axs[1].axis("off")
axs[2].axis("off")
if showing_predictions:
axs[3].imshow(
predictions, vmin=0, vmax=19, cmap=self._cmap, interpolation="none"
)
axs[3].axis("off")
if show_titles:
axs[0].set_title("Image 0")
axs[1].set_title("Image 1")
axs[2].set_title("Mask")
if showing_predictions:
axs[3].set_title("Prediction")
if suptitle is not None:
plt.suptitle(suptitle)
return fig