[WIP] Add satellite image processing benchmark

tests/geospatial/test_satellite_filtering.py

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+import datetime
+
+import fsspec
+import geojson
+import planetary_computer
+import pystac_client
+import stackstac
+import xarray as xr
+from distributed import wait
+
+
+def harmonize_to_old(data):
+    """
+    Harmonize new Sentinel-2 data to the old baseline.
+
+    Parameters
+    ----------
+    data: xarray.DataArray
+        A DataArray with four dimensions: time, band, y, x
+
+    Returns
+    -------
+    harmonized: xarray.DataArray
+        A DataArray with all values harmonized to the old
+        processing baseline.
+    """
+    cutoff = datetime.datetime(2022, 1, 25)
+    offset = 1000
+    bands = [
+        "B01",
+        "B02",
+        "B03",
+        "B04",
+        "B05",
+        "B06",
+        "B07",
+        "B08",
+        "B8A",
+        "B09",
+        "B10",
+        "B11",
+        "B12",
+    ]
+
+    old = data.sel(time=slice(cutoff))
+
+    to_process = list(set(bands) & set(data.band.data.tolist()))
+    new = data.sel(time=slice(cutoff, None)).drop_sel(band=to_process)
+
+    new_harmonized = data.sel(time=slice(cutoff, None), band=to_process).clip(offset)
+    new_harmonized -= offset
+
+    new = xr.concat([new, new_harmonized], "band").sel(band=data.band.data.tolist())
+    return xr.concat([old, new], dim="time")
+
+
+def test_satellite_filtering(
+    scale,
+    client_factory,
+    cluster_kwargs={
+        "workspace": "dask-engineering-azure",
+        "region": "westeurope",
+        "wait_for_workers": True,
+    },
+    scale_kwargs={
+        "small": {"n_workers": 10},
+        "large": {"n_workers": 100},
+    },
+):
+    with client_factory(
+        **scale_kwargs[scale], **cluster_kwargs
+    ) as client:  # noqa: F841
+        catalog = pystac_client.Client.open(
+            "https://planetarycomputer.microsoft.com/api/stac/v1",
+            modifier=planetary_computer.sign_inplace,
+        )
+
+        # GeoJSON for region of interest is from https://github.com/isellsoap/deutschlandGeoJSON/tree/main/1_deutschland
+        with fsspec.open(
+            "https://raw.githubusercontent.com/isellsoap/deutschlandGeoJSON/main/1_deutschland/3_mittel.geo.json"
+        ) as f:
+            gj = geojson.load(f)
+
+        # Flatten MultiPolygon to single Polygon
+        coordinates = []
+        for x in gj.features[0]["geometry"]["coordinates"]:
+            coordinates.extend(x)
+        area_of_interest = {
+            "type": "Polygon",
+            "coordinates": coordinates,
+        }
+
+        # Get stack items
+        if scale == "small":
+            time_of_interest = "2024-01-01/2024-09-01"
+        else:
+            time_of_interest = "2015-01-01/2024-09-01"
+
+        search = catalog.search(
+            collections=["sentinel-2-l2a"],
+            intersects=area_of_interest,
+            datetime=time_of_interest,
+        )
+        items = search.item_collection()
+
+        # Construct Xarray Dataset from stack items
+        ds = stackstac.stack(items, assets=["B08", "B11"], chunksize=(400, 1, 256, 256))
+        # See https://planetarycomputer.microsoft.com/dataset/sentinel-2-l2a#Baseline-Change
+        ds = harmonize_to_old(ds)
+
+        # Compute humidity index
+        humidity = (ds.sel(band="B08") - ds.sel(band="B11")) / (
+            ds.sel(band="B08") + ds.sel(band="B11")
+        )
+        result = humidity.groupby("time.month").mean()
+        result = result.persist()
+        wait(result)