Create a Sentinel-1 Item¶

from datetime import datetime, timezone

import pystac
from pystac.extensions.sentinel1 import Sentinel1Extension

acquisition_datetime = datetime(2023, 2, 1, tzinfo=timezone.utc)
item = pystac.Item(
    id="example-sentinel-1",
    geometry=None,
    bbox=None,
    datetime=acquisition_datetime,
    properties={},
)
sentinel1 = Sentinel1Extension.ext(item, add_if_missing=True)
sentinel1.apply(
    datatake_id="420895",
    instrument_configuration_id="7",
    orbit_source="PREORB",
    slice_number="17",
    total_slices="17",
)
serialized = item.to_dict()
assert Sentinel1Extension.get_schema_uri() in serialized["stac_extensions"]
assert serialized["properties"]["s1:instrument_configuration_ID"] == "7"
restored = Sentinel1Extension.ext(pystac.Item.from_dict(serialized))
assert restored.datatake_id == "420895"
assert restored.slice_number == "17"