From c7e6dbda56455cffcf3679948b385e37ef75a974 Mon Sep 17 00:00:00 2001
From: Ashwin Nair <ash1995@gmail.com>
Date: Thu, 17 Nov 2022 10:29:52 +0400
Subject: [PATCH] Add SpaceNet6 & data.py (#878)

* Add SpaceNet6 & data.py

* For coverage

* Added SpaceNet6 to docs

* Cleanup

* Docfix

* Move importskip to module level

Co-authored-by: Caleb Robinson <calebrob6@gmail.com>
---
 docs/api/datasets.rst                         |   1 +
 tests/data/spacenet/data.py                   | 283 ++++++++++++++++++
 tests/data/spacenet/sn1_AOI_1_RIO.tar.gz      | Bin 1308 -> 1052 bytes
 tests/data/spacenet/sn2_AOI_2_Vegas.tar.gz    | Bin 1174 -> 1149 bytes
 tests/data/spacenet/sn2_AOI_3_Paris.tar.gz    | Bin 1074 -> 1182 bytes
 tests/data/spacenet/sn2_AOI_4_Shanghai.tar.gz | Bin 1090 -> 1175 bytes
 tests/data/spacenet/sn2_AOI_5_Khartoum.tar.gz | Bin 1084 -> 1191 bytes
 tests/data/spacenet/sn3_AOI_2_Vegas.tar.gz    | Bin 0 -> 1324 bytes
 tests/data/spacenet/sn3_AOI_3_Paris.tar.gz    | Bin 1176 -> 1314 bytes
 tests/data/spacenet/sn3_AOI_4_Shanghai.tar.gz | Bin 0 -> 1338 bytes
 tests/data/spacenet/sn3_AOI_5_Khartoum.tar.gz | Bin 1193 -> 1280 bytes
 tests/data/spacenet/sn4_AOI_6_Atlanta.tar.gz  | Bin 1416 -> 1550 bytes
 tests/data/spacenet/sn5_AOI_7_Moscow.tar.gz   | Bin 1313 -> 1332 bytes
 tests/data/spacenet/sn5_AOI_8_Mumbai.tar.gz   | Bin 1507 -> 1457 bytes
 tests/data/spacenet/sn7_test_source.tar.gz    | Bin 465 -> 818 bytes
 tests/data/spacenet/sn7_train_labels.tar.gz   | Bin 561 -> 905 bytes
 tests/data/spacenet/sn7_train_source.tar.gz   | Bin 507 -> 859 bytes
 .../sn6_AOI_11_Rotterdam/collection.json      |   0
 .../labels.geojson                            |   7 +
 .../sn6_AOI_11_Rotterdam_img1/PAN.tif         | Bin 0 -> 374 bytes
 .../sn6_AOI_11_Rotterdam_img1/PS-RGB.tif      | Bin 0 -> 414 bytes
 .../sn6_AOI_11_Rotterdam_img1/PS-RGBNIR.tif   | Bin 0 -> 432 bytes
 .../sn6_AOI_11_Rotterdam_img1/RGBNIR.tif      | Bin 0 -> 432 bytes
 .../SAR-Intensity.tif                         | Bin 0 -> 374 bytes
 .../labels.geojson                            |   7 +
 .../sn6_AOI_11_Rotterdam_img2/PAN.tif         | Bin 0 -> 374 bytes
 .../sn6_AOI_11_Rotterdam_img2/PS-RGB.tif      | Bin 0 -> 414 bytes
 .../sn6_AOI_11_Rotterdam_img2/PS-RGBNIR.tif   | Bin 0 -> 432 bytes
 .../sn6_AOI_11_Rotterdam_img2/RGBNIR.tif      | Bin 0 -> 432 bytes
 .../SAR-Intensity.tif                         | Bin 0 -> 374 bytes
 tests/datasets/test_spacenet.py               |  93 ++++--
 torchgeo/datasets/__init__.py                 |   2 +
 torchgeo/datasets/spacenet.py                 | 193 +++++++++---
 33 files changed, 523 insertions(+), 63 deletions(-)
 create mode 100644 tests/data/spacenet/data.py
 create mode 100644 tests/data/spacenet/sn3_AOI_2_Vegas.tar.gz
 create mode 100644 tests/data/spacenet/sn3_AOI_4_Shanghai.tar.gz
 create mode 100644 tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/collection.json
 create mode 100644 tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img1-labels/labels.geojson
 create mode 100644 tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img1/PAN.tif
 create mode 100644 tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img1/PS-RGB.tif
 create mode 100644 tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img1/PS-RGBNIR.tif
 create mode 100644 tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img1/RGBNIR.tif
 create mode 100644 tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img1/SAR-Intensity.tif
 create mode 100644 tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img2-labels/labels.geojson
 create mode 100644 tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img2/PAN.tif
 create mode 100644 tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img2/PS-RGB.tif
 create mode 100644 tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img2/PS-RGBNIR.tif
 create mode 100644 tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img2/RGBNIR.tif
 create mode 100644 tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img2/SAR-Intensity.tif

diff --git a/docs/api/datasets.rst b/docs/api/datasets.rst
index ea3615dc404..10d49dde8f5 100644
--- a/docs/api/datasets.rst
+++ b/docs/api/datasets.rst
@@ -288,6 +288,7 @@ SpaceNet
 .. autoclass:: SpaceNet3
 .. autoclass:: SpaceNet4
 .. autoclass:: SpaceNet5
+.. autoclass:: SpaceNet6
 .. autoclass:: SpaceNet7
 
 Tropical Cyclone
diff --git a/tests/data/spacenet/data.py b/tests/data/spacenet/data.py
new file mode 100644
index 00000000000..37d67e98518
--- /dev/null
+++ b/tests/data/spacenet/data.py
@@ -0,0 +1,283 @@
+#!/usr/bin/env python3
+
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License.
+
+import os
+import shutil
+from collections import OrderedDict
+from typing import List, cast
+
+import fiona
+import numpy as np
+import rasterio
+from rasterio.crs import CRS
+from rasterio.transform import Affine
+from torchvision.datasets.utils import calculate_md5
+
+from torchgeo.datasets import (
+    SpaceNet,
+    SpaceNet1,
+    SpaceNet2,
+    SpaceNet3,
+    SpaceNet4,
+    SpaceNet5,
+    SpaceNet6,
+    SpaceNet7,
+)
+
+transform = Affine(0.3, 0.0, 616500.0, 0.0, -0.3, 3345000.0)
+crs = CRS.from_epsg(4326)
+
+img_count = {
+    "MS.tif": 8,
+    "PAN.tif": 1,
+    "PS-MS.tif": 8,
+    "PS-RGB.tif": 3,
+    "PS-RGBNIR.tif": 4,
+    "RGB.tif": 3,
+    "RGBNIR.tif": 4,
+    "SAR-Intensity.tif": 1,
+    "mosaic.tif": 3,
+    "8Band.tif": 8,
+}
+
+
+sn4_catalog = [
+    "10300100023BC100",
+    "10300100036D5200",
+    "1030010003BDDC00",
+    "1030010003CD4300",
+]
+sn4_angles = [8, 30, 52, 53]
+
+sn4_imgdirname = "sn4_SN4_buildings_train_AOI_6_Atlanta_732701_3730989-nadir{}_catid_{}"
+sn4_lbldirname = "sn4_SN4_buildings_train_AOI_6_Atlanta_732701_3730989-labels"
+sn4_emptyimgdirname = (
+    "sn4_SN4_buildings_train_AOI_6_Atlanta_732701_3720639-nadir53_"
+    + "catid_1030010003CD4300"
+)
+sn4_emptylbldirname = "sn4_SN4_buildings_train_AOI_6_Atlanta_732701_3720639-labels"
+
+
+datasets = [SpaceNet1, SpaceNet2, SpaceNet3, SpaceNet4, SpaceNet5, SpaceNet6, SpaceNet7]
+
+
+def create_test_image(img_dir: str, imgs: List[str]) -> List[List[float]]:
+    """Create test image
+
+    Args:
+        img_dir (str): Name of image directory
+        imgs (List[str]): List of images to be created
+
+    Returns:
+        List[List[float]]: Boundary coordinates
+    """
+    for img in imgs:
+        imgpath = os.path.join(img_dir, img)
+        Z = np.arange(4, dtype="uint16").reshape(2, 2)
+        count = img_count[img]
+        with rasterio.open(
+            imgpath,
+            "w",
+            driver="GTiff",
+            height=Z.shape[0],
+            width=Z.shape[1],
+            count=count,
+            dtype=Z.dtype,
+            crs=crs,
+            transform=transform,
+        ) as dst:
+            for i in range(1, dst.count + 1):
+                dst.write(Z, i)
+
+    tim = rasterio.open(imgpath)
+    slice_index = [[1, 1], [1, 2], [2, 2], [2, 1], [1, 1]]
+    return [list(tim.transform * p) for p in slice_index]
+
+
+def create_test_label(
+    lbldir: str,
+    lblname: str,
+    coords: List[List[float]],
+    det_type: str,
+    empty: bool = False,
+    diff_crs: bool = False,
+) -> None:
+    """Create test label
+
+    Args:
+        lbldir (str): Name of label directory
+        lblname (str): Name of label file
+        coords (List[Tuple[float, float]]): Boundary coordinates
+        det_type (str): Type of dataset. Must be either buildings or roads.
+        empty (bool, optional): Creates empty label file if True. Defaults to False.
+        diff_crs (bool, optional): Assigns EPSG:3857 as CRS instead of
+                                   default EPSG:4326. Defaults to False.
+    """
+    if empty:
+        # Creates a new file
+        with open(os.path.join(lbldir, lblname), "w"):
+            pass
+        return
+
+    if det_type == "buildings":
+        meta_properties = OrderedDict()
+        geom = "Polygon"
+        rec = {
+            "type": "Feature",
+            "id": "0",
+            "properties": OrderedDict(),
+            "geometry": {"type": "Polygon", "coordinates": [coords]},
+        }
+    else:
+        meta_properties = OrderedDict(
+            [
+                ("heading", "str"),
+                ("lane_number", "str"),
+                ("one_way_ty", "str"),
+                ("paved", "str"),
+                ("road_id", "int"),
+                ("road_type", "str"),
+                ("origarea", "int"),
+                ("origlen", "float"),
+                ("partialDec", "int"),
+                ("truncated", "int"),
+                ("bridge_type", "str"),
+                ("inferred_speed_mph", "float"),
+                ("inferred_speed_mps", "float"),
+            ]
+        )
+        geom = "LineString"
+
+        dummy_vals = {"str": "a", "float": 45.0, "int": 0}
+        ROAD_DICT = [(k, dummy_vals[v]) for k, v in meta_properties.items()]
+        rec = {
+            "type": "Feature",
+            "id": "0",
+            "properties": OrderedDict(ROAD_DICT),
+            "geometry": {"type": "LineString", "coordinates": [coords[0], coords[2]]},
+        }
+
+    meta = {
+        "driver": "GeoJSON",
+        "schema": {"properties": meta_properties, "geometry": geom},
+        "crs": {"init": "epsg:4326"},
+    }
+    if diff_crs:
+        meta["crs"] = {"init": "epsg:3857"}
+    out_file = os.path.join(lbldir, lblname)
+    with fiona.open(out_file, "w", **meta) as dst:
+        dst.write(rec)
+
+
+def main() -> None:
+    ROOT_DIR = os.path.dirname(os.path.realpath(__file__))
+
+    num_samples = 2
+
+    for dataset in datasets:
+
+        collections = list(dataset.collection_md5_dict.keys())
+        for collection in collections:
+            dataset = cast(SpaceNet, dataset)
+            if dataset.dataset_id == "spacenet4":
+                num_samples = 4
+            elif collection == "sn5_AOI_7_Moscow" or collection not in [
+                "sn5_AOI_8_Mumbai",
+                "sn7_test_source",
+            ]:
+                num_samples = 2
+            elif collection == "sn5_AOI_8_Mumbai":
+                num_samples = 3
+            else:
+                num_samples = 1
+            for sample in range(num_samples):
+                out_dir = os.path.join(ROOT_DIR, collection)
+                if collection == "sn6_AOI_11_Rotterdam":
+                    out_dir = os.path.join(ROOT_DIR, "spacenet6", collection)
+
+                # Create img dir
+                if dataset.dataset_id == "spacenet4":
+                    assert num_samples == 4
+                    if sample != 3:
+                        imgdirname = sn4_imgdirname.format(
+                            sn4_angles[sample], sn4_catalog[sample]
+                        )
+                        lbldirname = sn4_lbldirname
+                    else:
+                        imgdirname = sn4_emptyimgdirname.format(
+                            sn4_angles[sample], sn4_catalog[sample]
+                        )
+                        lbldirname = sn4_emptylbldirname
+                else:
+                    imgdirname = f"{collection}_img{sample + 1}"
+                    lbldirname = f"{collection}_img{sample + 1}-labels"
+
+                imgdir = os.path.join(out_dir, imgdirname)
+                os.makedirs(imgdir, exist_ok=True)
+                bounds = create_test_image(imgdir, list(dataset.imagery.values()))
+
+                # Create lbl dir
+                lbldir = os.path.join(out_dir, lbldirname)
+                os.makedirs(lbldir, exist_ok=True)
+                det_type = "roads" if dataset in [SpaceNet3, SpaceNet5] else "buildings"
+                if dataset.dataset_id == "spacenet4" and sample == 3:
+                    # Creates an empty file
+                    create_test_label(
+                        lbldir, dataset.label_glob, bounds, det_type, empty=True
+                    )
+                else:
+                    create_test_label(lbldir, dataset.label_glob, bounds, det_type)
+
+                if collection == "sn5_AOI_8_Mumbai":
+                    if sample == 1:
+                        create_test_label(
+                            lbldir, dataset.label_glob, bounds, det_type, empty=True
+                        )
+                    if sample == 2:
+                        create_test_label(
+                            lbldir, dataset.label_glob, bounds, det_type, diff_crs=True
+                        )
+
+                if collection == "sn1_AOI_1_RIO" and sample == 1:
+                    create_test_label(
+                        lbldir, dataset.label_glob, bounds, det_type, diff_crs=True
+                    )
+
+                if collection not in [
+                    "sn2_AOI_2_Vegas",
+                    "sn3_AOI_5_Khartoum",
+                    "sn4_AOI_6_Atlanta",
+                    "sn5_AOI_8_Mumbai",
+                    "sn6_AOI_11_Rotterdam",
+                    "sn7_train_source",
+                ]:
+                    # Create collection.json
+                    with open(
+                        os.path.join(ROOT_DIR, collection, "collection.json"), "w"
+                    ):
+                        pass
+                if collection == "sn6_AOI_11_Rotterdam":
+                    # Create collection.json
+                    with open(
+                        os.path.join(
+                            ROOT_DIR, "spacenet6", collection, "collection.json"
+                        ),
+                        "w",
+                    ):
+                        pass
+
+            # Create archive
+            if collection == "sn6_AOI_11_Rotterdam":
+                break
+            archive_path = os.path.join(ROOT_DIR, collection)
+            shutil.make_archive(
+                archive_path, "gztar", root_dir=ROOT_DIR, base_dir=collection
+            )
+            shutil.rmtree(out_dir)
+            print(f'{collection}: {calculate_md5(f"{archive_path}.tar.gz")}')
+
+
+if __name__ == "__main__":
+    main()
diff --git a/tests/data/spacenet/sn1_AOI_1_RIO.tar.gz b/tests/data/spacenet/sn1_AOI_1_RIO.tar.gz
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diff --git a/tests/data/spacenet/sn2_AOI_2_Vegas.tar.gz b/tests/data/spacenet/sn2_AOI_2_Vegas.tar.gz
index fe01659fe2ef286bbfab4b318f112f4fbb5fd3a7..c7cbcd5b4fc85821f6c5ca794183136a2a74a056 100644
GIT binary patch
literal 1149
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diff --git a/tests/data/spacenet/sn2_AOI_3_Paris.tar.gz b/tests/data/spacenet/sn2_AOI_3_Paris.tar.gz
index 3eaec04c45de86eefa4c21c40dfbee90435c6aeb..6c26bde44d72be677393a4cf096bb4a5fda4ef97 100644
GIT binary patch
literal 1182
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diff --git a/tests/data/spacenet/sn2_AOI_4_Shanghai.tar.gz b/tests/data/spacenet/sn2_AOI_4_Shanghai.tar.gz
index 138a9079e43c4f7463446c0d0f42b0c702b046b9..b7d8ba655e1f6747817f8f0e6890b625abb48941 100644
GIT binary patch
literal 1175
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diff --git a/tests/data/spacenet/sn2_AOI_5_Khartoum.tar.gz b/tests/data/spacenet/sn2_AOI_5_Khartoum.tar.gz
index f0131ad3b8cc0a74d2dbc0d06b8d62fbec943f96..b0a4b29ca34433a7b0c273b3f48bda44747e946e 100644
GIT binary patch
literal 1191
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diff --git a/tests/data/spacenet/sn3_AOI_2_Vegas.tar.gz b/tests/data/spacenet/sn3_AOI_2_Vegas.tar.gz
new file mode 100644
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diff --git a/tests/data/spacenet/sn3_AOI_3_Paris.tar.gz b/tests/data/spacenet/sn3_AOI_3_Paris.tar.gz
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diff --git a/tests/data/spacenet/sn3_AOI_4_Shanghai.tar.gz b/tests/data/spacenet/sn3_AOI_4_Shanghai.tar.gz
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diff --git a/tests/data/spacenet/sn3_AOI_5_Khartoum.tar.gz b/tests/data/spacenet/sn3_AOI_5_Khartoum.tar.gz
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diff --git a/tests/data/spacenet/sn4_AOI_6_Atlanta.tar.gz b/tests/data/spacenet/sn4_AOI_6_Atlanta.tar.gz
index 1c382ff25dd4c07dd55dabdddd96a0e13106b5ff..a1e0c8a6910c9560196678e8bebd62fa0f9a49e1 100644
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diff --git a/tests/data/spacenet/sn5_AOI_7_Moscow.tar.gz b/tests/data/spacenet/sn5_AOI_7_Moscow.tar.gz
index acb289ebacd890f8376a24e5aa33bebab83fa961..c666f1b837c4c9d105f9f2661cc48b53b09a92ef 100644
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diff --git a/tests/data/spacenet/sn5_AOI_8_Mumbai.tar.gz b/tests/data/spacenet/sn5_AOI_8_Mumbai.tar.gz
index a6c6e353c2745210a7c65a8efec16ab40bc1ef64..4f6b9cd7ad4a35ff27e3244a1e44b02929bc135a 100644
GIT binary patch
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diff --git a/tests/data/spacenet/sn7_test_source.tar.gz b/tests/data/spacenet/sn7_test_source.tar.gz
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diff --git a/tests/data/spacenet/sn7_train_labels.tar.gz b/tests/data/spacenet/sn7_train_labels.tar.gz
index ae3bb5f4004f74a4b07c3e2292ff3fa3af8ac58e..b3f583771c0d856ff87054e6a879642657b29f0f 100644
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diff --git a/tests/data/spacenet/sn7_train_source.tar.gz b/tests/data/spacenet/sn7_train_source.tar.gz
index c2f8b2c8e5b419641538a9c7d2e72e4776f3cc6e..e847fd070a4617f55e30f5e78fb65b9c07e8ce55 100644
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diff --git a/tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/collection.json b/tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/collection.json
new file mode 100644
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diff --git a/tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img1-labels/labels.geojson b/tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img1-labels/labels.geojson
new file mode 100644
index 00000000000..0a418938820
--- /dev/null
+++ b/tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img1-labels/labels.geojson
@@ -0,0 +1,7 @@
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+]
+}
diff --git a/tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img1/PAN.tif b/tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img1/PAN.tif
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diff --git a/tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img1/PS-RGBNIR.tif b/tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img1/PS-RGBNIR.tif
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diff --git a/tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img1/RGBNIR.tif b/tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img1/RGBNIR.tif
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diff --git a/tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img1/SAR-Intensity.tif b/tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img1/SAR-Intensity.tif
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diff --git a/tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img2-labels/labels.geojson b/tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img2-labels/labels.geojson
new file mode 100644
index 00000000000..0a418938820
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@@ -0,0 +1,7 @@
+{
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+"crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:OGC:1.3:CRS84" } },
+"features": [
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+]
+}
diff --git a/tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img2/PAN.tif b/tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img2/PAN.tif
new file mode 100644
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GIT binary patch
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diff --git a/tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img2/PS-RGB.tif b/tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img2/PS-RGB.tif
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diff --git a/tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img2/PS-RGBNIR.tif b/tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img2/PS-RGBNIR.tif
new file mode 100644
index 0000000000000000000000000000000000000000..daadc4a2e39c82ef03fe23e6f567ef707b138269
GIT binary patch
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diff --git a/tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img2/RGBNIR.tif b/tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img2/RGBNIR.tif
new file mode 100644
index 0000000000000000000000000000000000000000..daadc4a2e39c82ef03fe23e6f567ef707b138269
GIT binary patch
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diff --git a/tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img2/SAR-Intensity.tif b/tests/data/spacenet/spacenet6/sn6_AOI_11_Rotterdam/sn6_AOI_11_Rotterdam_img2/SAR-Intensity.tif
new file mode 100644
index 0000000000000000000000000000000000000000..a9aef1da576c0c15b4c6f95102c686c595cb696a
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diff --git a/tests/datasets/test_spacenet.py b/tests/datasets/test_spacenet.py
index bf84b60633d..a20d6e9b2d8 100644
--- a/tests/datasets/test_spacenet.py
+++ b/tests/datasets/test_spacenet.py
@@ -19,10 +19,12 @@
     SpaceNet3,
     SpaceNet4,
     SpaceNet5,
+    SpaceNet6,
     SpaceNet7,
 )
 
 TEST_DATA_DIR = "tests/data/spacenet"
+radiant_mlhub = pytest.importorskip("radiant_mlhub", minversion="0.2.1")
 
 
 class Collection:
@@ -35,18 +37,33 @@ def download(self, output_dir: str, **kwargs: str) -> None:
             shutil.copy(tarball, output_dir)
 
 
+class Dataset:
+    def __init__(self, dataset_id: str) -> None:
+        self.dataset_id = dataset_id
+
+    def download(self, output_dir: str, **kwargs: str) -> None:
+        glob_path = os.path.join(TEST_DATA_DIR, "spacenet*")
+        for directory in glob.iglob(glob_path):
+            dataset_name = os.path.basename(directory)
+            output_dir = os.path.join(output_dir, dataset_name)
+            shutil.copytree(directory, output_dir)
+
+
 def fetch_collection(collection_id: str, **kwargs: str) -> Collection:
     return Collection(collection_id)
 
 
+def fetch_dataset(dataset_id: str, **kwargs: str) -> Dataset:
+    return Dataset(dataset_id)
+
+
 class TestSpaceNet1:
     @pytest.fixture(params=["rgb", "8band"])
     def dataset(
         self, request: SubRequest, monkeypatch: MonkeyPatch, tmp_path: Path
     ) -> SpaceNet1:
-        radiant_mlhub = pytest.importorskip("radiant_mlhub", minversion="0.2.1")
         monkeypatch.setattr(radiant_mlhub.Collection, "fetch", fetch_collection)
-        test_md5 = {"sn1_AOI_1_RIO": "829652022c2df4511ee4ae05bc290250"}
+        test_md5 = {"sn1_AOI_1_RIO": "246e27fcd7ae73496212a7f585a43dbb"}
 
         # Refer https://github.com/python/mypy/issues/1032
         monkeypatch.setattr(SpaceNet1, "collection_md5_dict", test_md5)
@@ -58,6 +75,7 @@ def dataset(
 
     def test_getitem(self, dataset: SpaceNet1) -> None:
         x = dataset[0]
+        dataset[1]
         assert isinstance(x, dict)
         assert isinstance(x["image"], torch.Tensor)
         assert isinstance(x["mask"], torch.Tensor)
@@ -90,13 +108,12 @@ class TestSpaceNet2:
     def dataset(
         self, request: SubRequest, monkeypatch: MonkeyPatch, tmp_path: Path
     ) -> SpaceNet2:
-        radiant_mlhub = pytest.importorskip("radiant_mlhub", minversion="0.2.1")
         monkeypatch.setattr(radiant_mlhub.Collection, "fetch", fetch_collection)
         test_md5 = {
-            "sn2_AOI_2_Vegas": "6ceae7ff8c557346e8a4c8b6c61cc1b9",
-            "sn2_AOI_3_Paris": "811e6a26fdeb8be445fed99769fa52c5",
-            "sn2_AOI_4_Shanghai": "139d1627d184c74426a85ad0222f7355",
-            "sn2_AOI_5_Khartoum": "435535120414b74165aa87f051c3a2b3",
+            "sn2_AOI_2_Vegas": "131048686ba21a45853c05f227f40b7f",
+            "sn2_AOI_3_Paris": "62242fd198ee32b59f0178cf656e1513",
+            "sn2_AOI_4_Shanghai": "563b0817ecedd8ff3b3e4cb2991bf3fb",
+            "sn2_AOI_5_Khartoum": "e4185a2e9a12cf7b3d0cd1db6b3e0f06",
         }
 
         monkeypatch.setattr(SpaceNet2, "collection_md5_dict", test_md5)
@@ -123,9 +140,8 @@ def test_getitem(self, dataset: SpaceNet2) -> None:
         else:
             assert x["image"].shape[0] == 1
 
-    # TODO: Change len to 4 when radiantearth/radiant-mlhub#65 is fixed
     def test_len(self, dataset: SpaceNet2) -> None:
-        assert len(dataset) == 5
+        assert len(dataset) == 4
 
     def test_already_downloaded(self, dataset: SpaceNet2) -> None:
         SpaceNet2(root=dataset.root, download=True)
@@ -153,11 +169,10 @@ class TestSpaceNet3:
     def dataset(
         self, request: SubRequest, monkeypatch: MonkeyPatch, tmp_path: Path
     ) -> SpaceNet3:
-        radiant_mlhub = pytest.importorskip("radiant_mlhub", minversion="0.2.1")
         monkeypatch.setattr(radiant_mlhub.Collection, "fetch", fetch_collection)
         test_md5 = {
-            "sn3_AOI_3_Paris": "197440e0ade970169a801a173a492c27",
-            "sn3_AOI_5_Khartoum": "b21ff7dd33a15ec32bd380c083263cdf",
+            "sn3_AOI_3_Paris": "93452c68da11dd6b57dc83dba43c2c9d",
+            "sn3_AOI_5_Khartoum": "7c9d96810198bf101cbaf54f7a5e8b3b",
         }
 
         monkeypatch.setattr(SpaceNet3, "collection_md5_dict", test_md5)
@@ -218,9 +233,8 @@ class TestSpaceNet4:
     def dataset(
         self, request: SubRequest, monkeypatch: MonkeyPatch, tmp_path: Path
     ) -> SpaceNet4:
-        radiant_mlhub = pytest.importorskip("radiant_mlhub", minversion="0.2.1")
         monkeypatch.setattr(radiant_mlhub.Collection, "fetch", fetch_collection)
-        test_md5 = {"sn4_AOI_6_Atlanta": "ea37c2d87e2c3a1d8b2a7c2230080d46"}
+        test_md5 = {"sn4_AOI_6_Atlanta": "097a76a2319b7ba34dac1722862fc93b"}
 
         test_angles = ["nadir", "off-nadir", "very-off-nadir"]
 
@@ -281,11 +295,10 @@ class TestSpaceNet5:
     def dataset(
         self, request: SubRequest, monkeypatch: MonkeyPatch, tmp_path: Path
     ) -> SpaceNet5:
-        radiant_mlhub = pytest.importorskip("radiant_mlhub", minversion="0.2.1")
         monkeypatch.setattr(radiant_mlhub.Collection, "fetch", fetch_collection)
         test_md5 = {
-            "sn5_AOI_7_Moscow": "e0d5f41f1b6b0ee7696c15e5ff3141f5",
-            "sn5_AOI_8_Mumbai": "ab898700ee586a137af492b84a08e662",
+            "sn5_AOI_7_Moscow": "5c511dd31eea739cc1f81ef5962f3d56",
+            "sn5_AOI_8_Mumbai": "e00452b87bbe87feaef65f373be3978e",
         }
 
         monkeypatch.setattr(SpaceNet5, "collection_md5_dict", test_md5)
@@ -339,17 +352,55 @@ def test_plot(self, dataset: SpaceNet5) -> None:
         plt.close()
 
 
+class TestSpaceNet6:
+    @pytest.fixture(params=["PAN", "RGBNIR", "PS-RGB", "PS-RGBNIR", "SAR-Intensity"])
+    def dataset(
+        self, request: SubRequest, monkeypatch: MonkeyPatch, tmp_path: Path
+    ) -> SpaceNet6:
+        monkeypatch.setattr(radiant_mlhub.Dataset, "fetch", fetch_dataset)
+        root = str(tmp_path)
+        transforms = nn.Identity()
+        return SpaceNet6(
+            root, image=request.param, transforms=transforms, download=True, api_key=""
+        )
+
+    def test_getitem(self, dataset: SpaceNet6) -> None:
+        x = dataset[0]
+        assert isinstance(x, dict)
+        assert isinstance(x["image"], torch.Tensor)
+        assert isinstance(x["mask"], torch.Tensor)
+        if dataset.image == "PS-RGB":
+            assert x["image"].shape[0] == 3
+        elif dataset.image in ["RGBNIR", "PS-RGBNIR"]:
+            assert x["image"].shape[0] == 4
+        else:
+            assert x["image"].shape[0] == 1
+
+    def test_len(self, dataset: SpaceNet6) -> None:
+        assert len(dataset) == 2
+
+    def test_already_downloaded(self, dataset: SpaceNet6) -> None:
+        SpaceNet6(root=dataset.root, download=True)
+
+    def test_plot(self, dataset: SpaceNet6) -> None:
+        x = dataset[0].copy()
+        x["prediction"] = x["mask"]
+        dataset.plot(x, suptitle="Test")
+        plt.close()
+        dataset.plot(x, show_titles=False)
+        plt.close()
+
+
 class TestSpaceNet7:
     @pytest.fixture(params=["train", "test"])
     def dataset(
         self, request: SubRequest, monkeypatch: MonkeyPatch, tmp_path: Path
     ) -> SpaceNet7:
-        radiant_mlhub = pytest.importorskip("radiant_mlhub", minversion="0.2.1")
         monkeypatch.setattr(radiant_mlhub.Collection, "fetch", fetch_collection)
         test_md5 = {
-            "sn7_train_source": "254fd6b16e350b071137b2658332091f",
-            "sn7_train_labels": "05befe86b037a3af75c7143553033664",
-            "sn7_test_source": "37d98d44a9da39657ed4b7beee22a21e",
+            "sn7_train_source": "197bfa8842a40b09b6837b824a6370e0",
+            "sn7_train_labels": "625ad8a989a5105bc766a53e53df4d0e",
+            "sn7_test_source": "461f59eb21bb4f416c867f5037dfceeb",
         }
 
         monkeypatch.setattr(SpaceNet7, "collection_md5_dict", test_md5)
diff --git a/torchgeo/datasets/__init__.py b/torchgeo/datasets/__init__.py
index 6b6aa6fbc6e..f85ff83510d 100644
--- a/torchgeo/datasets/__init__.py
+++ b/torchgeo/datasets/__init__.py
@@ -92,6 +92,7 @@
     SpaceNet3,
     SpaceNet4,
     SpaceNet5,
+    SpaceNet6,
     SpaceNet7,
 )
 from .ucmerced import UCMerced
@@ -184,6 +185,7 @@
     "SpaceNet3",
     "SpaceNet4",
     "SpaceNet5",
+    "SpaceNet6",
     "SpaceNet7",
     "TropicalCyclone",
     "UCMerced",
diff --git a/torchgeo/datasets/spacenet.py b/torchgeo/datasets/spacenet.py
index 3bbf24daa11..3e5baa7ad75 100644
--- a/torchgeo/datasets/spacenet.py
+++ b/torchgeo/datasets/spacenet.py
@@ -28,6 +28,7 @@
 from .utils import (
     check_integrity,
     download_radiant_mlhub_collection,
+    download_radiant_mlhub_dataset,
     extract_archive,
     percentile_normalization,
 )
@@ -40,6 +41,13 @@ class SpaceNet(NonGeoDataset, abc.ABC):
     datasets that all together contain >11M building footprints and ~20,000 km
     of road labels mapped over high-resolution satellite imagery obtained from
     a variety of sensors such as Worldview-2, Worldview-3 and Dove.
+
+    .. note::
+
+       The SpaceNet datasets require the following additional library to be installed:
+
+       * `radiant-mlhub <https://pypi.org/project/radiant-mlhub/>`_ to download the
+           imagery and labels from the Radiant Earth MLHub
     """
 
     @property
@@ -384,13 +392,6 @@ class SpaceNet1(SpaceNet):
 
     * https://arxiv.org/abs/1807.01232
 
-    .. note::
-
-       This dataset requires the following additional library to be installed:
-
-       * `radiant-mlhub <https://pypi.org/project/radiant-mlhub/>`_ to download the
-         imagery and labels from the Radiant Earth MLHub
-
     """
 
     dataset_id = "spacenet1"
@@ -490,13 +491,6 @@ class SpaceNet2(SpaceNet):
 
     * https://arxiv.org/abs/1807.01232
 
-    .. note::
-
-       This dataset requires the following additional library to be installed:
-
-       * `radiant-mlhub <https://pypi.org/project/radiant-mlhub/>`_ to download the
-         imagery and labels from the Radiant Earth MLHub
-
     """
 
     dataset_id = "spacenet2"
@@ -616,13 +610,6 @@ class SpaceNet3(SpaceNet):
 
     * https://arxiv.org/abs/1807.01232
 
-    .. note::
-
-       This dataset requires the following additional library to be installed:
-
-       * `radiant-mlhub <https://pypi.org/project/radiant-mlhub/>`_ to download the
-         imagery and labels from the Radiant Earth MLHub
-
     .. versionadded:: 0.3
     """
 
@@ -853,13 +840,6 @@ class SpaceNet4(SpaceNet):
 
     * https://arxiv.org/abs/1903.12239
 
-    .. note::
-
-       This dataset requires the following additional library to be installed:
-
-       * `radiant-mlhub <https://pypi.org/project/radiant-mlhub/>`_ to download the
-         imagery and labels from the Radiant Earth MLHub
-
     """
 
     dataset_id = "spacenet4"
@@ -1050,13 +1030,6 @@ class SpaceNet5(SpaceNet3):
       Route Travel Time Estimation from Satellite Imagery”,
       https://spacenet.ai/sn5-challenge/
 
-    .. note::
-
-       This dataset requires the following additional library to be installed:
-
-       * `radiant-mlhub <https://pypi.org/project/radiant-mlhub/>`_ to download the
-         imagery and labels from the Radiant Earth MLHub
-
     .. versionadded:: 0.2
     """
 
@@ -1122,6 +1095,149 @@ def __init__(
         )
 
 
+class SpaceNet6(SpaceNet):
+    r"""SpaceNet 6: Multi-Sensor All-Weather Mapping.
+
+    `SpaceNet 6 <https://spacenet.ai/sn6-challenge/>`_ is a dataset
+    of optical and SAR imagery over the city of Rotterdam.
+
+    Collection features:
+
+    +------------+---------------------+------------+-----------------------------+
+    |    AOI     | Area (km\ :sup:`2`\)| # Images   | # Building Footprint Labels |
+    +============+=====================+============+=============================+
+    | Rotterdam  |    120              |   3401     |         48000               |
+    +------------+---------------------+------------+-----------------------------+
+
+
+    Imagery features:
+
+    .. list-table::
+        :widths: 10 10 10 10 10 10
+        :header-rows: 1
+        :stub-columns: 1
+
+        *   -
+            - PAN
+            - RGBNIR
+            - PS-RGB
+            - PS-RGBNIR
+            - SAR-Intensity
+        *   - GSD (m)
+            - 0.5
+            - 2.0
+            - 0.5
+            - 0.5
+            - 0.5
+        *   - Chip size (px)
+            - 900 x 900
+            - 450 x 450
+            - 900 x 900
+            - 900 x 900
+            - 900 x 900
+
+
+    Dataset format:
+
+    * Imagery - GeoTIFFs from Worldview-2 (optical) and Capella Space (SAR)
+
+        * PAN.tif (Panchromatic)
+        * RGBNIR.tif (Multispectral)
+        * PS-RGB (Pansharpened RGB)
+        * PS-RGBNIR (Pansharpened RGBNIR)
+        * SAR-Intensity (SAR Intensity)
+
+    * Labels - GeoJSON
+
+        * labels.geojson
+
+    If you use this dataset in your research, please cite the following paper:
+
+    * https://arxiv.org/abs/2004.06500
+
+    .. note::
+
+       This dataset requires the following additional library to be installed:
+
+       * `radiant-mlhub <https://pypi.org/project/radiant-mlhub/>`_ to download the
+         imagery and labels from the Radiant Earth MLHub
+
+    .. versionadded:: 0.4
+    """
+
+    dataset_id = "spacenet6"
+    collections = ["sn6_AOI_11_Rotterdam"]
+    # This is actually the metadata hash
+    collection_md5_dict = {"sn6_AOI_11_Rotterdam": "66f7312218fec67a1e0b3b02b22c95cc"}
+    imagery = {
+        "PAN": "PAN.tif",
+        "RGBNIR": "RGBNIR.tif",
+        "PS-RGB": "PS-RGB.tif",
+        "PS-RGBNIR": "PS-RGBNIR.tif",
+        "SAR-Intensity": "SAR-Intensity.tif",
+    }
+    chip_size = {
+        "PAN": (900, 900),
+        "RGBNIR": (450, 450),
+        "PS-RGB": (900, 900),
+        "PS-RGBNIR": (900, 900),
+        "SAR-Intensity": (900, 900),
+    }
+    label_glob = "labels.geojson"
+
+    def __init__(
+        self,
+        root: str = "data",
+        image: str = "PS-RGB",
+        transforms: Optional[Callable[[Dict[str, Any]], Dict[str, Any]]] = None,
+        download: bool = False,
+        api_key: Optional[str] = None,
+    ) -> None:
+        """Initialize a new SpaceNet 6 Dataset instance.
+
+        Args:
+            root: root directory where dataset can be found
+            image: image selection which must be in ["PAN", "RGBNIR",
+                "PS-RGB", "PS-RGBNIR", "SAR-Intensity"]
+            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.
+            api_key: a RadiantEarth MLHub API key to use for downloading the dataset
+
+        Raises:
+            RuntimeError: if ``download=False`` but dataset is missing
+        """
+        self.root = root
+        self.image = image  # For testing
+
+        self.filename = self.imagery[image]
+        self.transforms = transforms
+
+        if download:
+            self.__download(api_key)
+
+        self.files = self._load_files(os.path.join(root, self.dataset_id))
+
+    def __download(self, api_key: Optional[str] = None) -> None:
+        """Download the dataset and extract it.
+
+        Args:
+            api_key: a RadiantEarth MLHub API key to use for downloading the dataset
+
+        Raises:
+            RuntimeError: if download doesn't work correctly or checksums don't match
+        """
+        if os.path.exists(
+            os.path.join(
+                self.root, self.dataset_id, self.collections[0], "collection.json"
+            )
+        ):
+            print("Files already downloaded and verified")
+            return
+
+        download_radiant_mlhub_dataset(self.dataset_id, self.root, api_key)
+
+
 class SpaceNet7(SpaceNet):
     """SpaceNet 7: Multi-Temporal Urban Development Challenge.
 
@@ -1155,13 +1271,6 @@ class SpaceNet7(SpaceNet):
 
     * https://arxiv.org/abs/2102.04420
 
-    .. note::
-
-       This dataset requires the following additional library to be installed:
-
-       * `radiant-mlhub <https://pypi.org/project/radiant-mlhub/>`_ to download the
-         imagery and labels from the Radiant Earth MLHub
-
     .. versionadded:: 0.2
     """