diff --git a/tests/test_10_dataspace_client.py b/tests/test_10_dataspace_client.py
new file mode 100644
index 0000000..b005706
--- /dev/null
+++ b/tests/test_10_dataspace_client.py
@@ -0,0 +1,16 @@
+import datetime
+from xarray_sentinel import dataspace_client
+
+
+def test_DataSpaceClient() -> None:
+    filter_template = "{start_date_iso} {stop_date_iso} {relative_orbit} {geometry_wkt}"
+    client = dataspace_client.DataSpaceClient(
+        products_odata_filter_template=filter_template
+    )
+    date = datetime.datetime(2020, 2, 3)
+    bbox = (0, 1, 2, 3)
+    expected = "2020-02-03T00:00:00 2020-02-03T00:00:00 22 SRID=4326;POLYGON ((2 1, 2 3, 0 3, 0 1, 2 1))"
+
+    res = client.build_sentinel1_products_odata_filter(date, date, 22, bbox)
+
+    assert res == expected
diff --git a/xarray_sentinel/dataspace_client.py b/xarray_sentinel/dataspace_client.py
new file mode 100644
index 0000000..b0761cb
--- /dev/null
+++ b/xarray_sentinel/dataspace_client.py
@@ -0,0 +1,93 @@
+import datetime
+from typing import Any
+
+import requests
+import shapely
+import typer
+
+DEFAULT_ODATA_URL: str = "https://catalogue.dataspace.copernicus.eu/odata/v1"
+DEFAULT_PRODUCTS_ODATA_FILTER_TEMPLATE = (
+    "((Collection/Name eq 'SENTINEL-1' "
+    "and (Attributes/OData.CSC.StringAttribute/any(att:att/Name eq 'instrumentShortName' "
+    "and att/OData.CSC.StringAttribute/Value eq 'SAR') "
+    "and (contains(Name,'GRD') and contains(Name,'_COG') "
+    "and OData.CSC.Intersects(area=geography'{geometry_wkt}'))) "
+    "and (Attributes/OData.CSC.StringAttribute/any(att:att/Name eq 'operationalMode' "
+    "and att/OData.CSC.StringAttribute/Value eq 'IW') "
+    "and Attributes/OData.CSC.IntegerAttribute/any(att:att/Name eq 'relativeOrbitNumber' "
+    "and att/OData.CSC.IntegerAttribute/Value eq {relative_orbit}))) "
+    "and ContentDate/Start ge {start_date_iso}Z and ContentDate/Start lt {stop_date_iso}Z)"
+)
+
+
+class DataSpaceClient:
+    def __init__(
+        self,
+        odata_url: str = DEFAULT_ODATA_URL,
+        products_odata_filter_template: str = DEFAULT_PRODUCTS_ODATA_FILTER_TEMPLATE,
+    ) -> None:
+        self.odata_url = odata_url
+        self.products_odata_filter_template = products_odata_filter_template
+
+    def build_sentinel1_products_odata_filter(
+        self,
+        start_date: datetime.datetime,
+        stop_date: datetime.datetime,
+        relative_orbit: int,
+        bbox: tuple[float, float, float, float] = (-180, -90, 180, 90),
+    ) -> str:
+        geometry = shapely.box(*bbox)
+        geometry_wkt = f"SRID=4326;{geometry.wkt}"
+        sentinel1_products_odata_filter = self.products_odata_filter_template.format(
+            geometry_wkt=geometry_wkt,
+            start_date_iso=start_date.isoformat(),
+            stop_date_iso=stop_date.isoformat(),
+            relative_orbit=relative_orbit,
+        )
+        return sentinel1_products_odata_filter
+
+    def search_sentinel1_products(
+        self,
+        start_date: datetime.datetime,
+        stop_date: datetime.datetime,
+        relative_orbit: int,
+        bbox: tuple[float, float, float, float] = (-180, -90, 180, 90),
+        limit: int = 100,
+    ) -> Any:
+        product_url = f"{self.odata_url}/Products"
+        odata_filter = self.build_sentinel1_products_odata_filter(
+            start_date, stop_date, relative_orbit, bbox
+        )
+        params: dict[str, str | int]
+        params = {
+            "$filter": odata_filter,
+            "$top": limit,
+        }
+        resp = requests.get(product_url, params=params)
+        resp.raise_for_status()
+        return resp.json()
+
+
+def get_s3paths(results: list[Any]) -> list[str]:
+    return sorted([result.get("S3Path") for result in results])
+
+
+def search_sentinel1_products(
+    start_date: datetime.datetime = datetime.datetime(2024, 1, 1),
+    stop_date: datetime.datetime = datetime.datetime(2024, 12, 31),
+    relative_orbit: int = 22,
+    bbox: tuple[float, float, float, float] = (6.75, 36.62, 18.48, 47.11),
+    limit: int = 100,
+    odata_url: str = DEFAULT_ODATA_URL,
+) -> None:
+    dataspace_client = DataSpaceClient(odata_url)
+    resutls = dataspace_client.search_sentinel1_products(
+        start_date, stop_date, relative_orbit, bbox, limit
+    )
+    results = get_s3paths(resutls["value"])
+    for res in results:
+        print(res)
+
+
+if __name__ == "__main__":
+    typer.run(search_sentinel1_products)
diff --git a/xarray_sentinel/sentinel1.py b/xarray_sentinel/sentinel1.py
index dc87d01..38520fd 100644
--- a/xarray_sentinel/sentinel1.py
+++ b/xarray_sentinel/sentinel1.py
@@ -26,7 +26,7 @@
 from . import conventions, esa_safe
 
 SPEED_OF_LIGHT = 299_792_458  # m / s
-ONE_SECOND = np.timedelta64(1, "s")
+ONE_SECOND = np.timedelta64(10**9, "ns")
 
 
 DataArrayOrDataset = TypeVar("DataArrayOrDataset", xr.DataArray, xr.Dataset)
@@ -768,6 +768,7 @@ def make_azimuth_time(
         start=product_first_line_utc_time,
         end=product_last_line_utc_time,
         periods=number_of_lines,
+        unit="ns",
     )
     return azimuth_time.values