Increase drifter random offset (#289)

* increase random noise bounds

* move test drifters away from domain edge

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: j-atkins

src/virtualship/utils.py

@@ -569,7 +569,7 @@ def _find_files_in_timerange(
     return [fname for _, fname in files_with_dates]
 
 
-def _random_noise(scale: float = 0.01, limit: float = 0.03) -> float:
+def _random_noise(scale: float = 0.05, limit: float = 0.1) -> float:
     """Generate a small random noise value for drifter seeding locations."""
     value = np.random.normal(loc=0.0, scale=scale)
     return np.clip(value, -limit, limit)  # ensure noise is within limits

tests/instruments/test_drifter.py

@@ -39,7 +39,7 @@ def test_simulate_drifters(tmpdir) -> None:
     drifters = [
         Drifter(
             spacetime=Spacetime(
-                location=Location(latitude=0.05, longitude=0.05),
+                location=Location(latitude=0.5, longitude=0.5),
                 time=base_time + datetime.timedelta(days=0),
             ),
             depth=0.0,