diff --git a/.github/workflows/pixi.yml b/.github/workflows/pixi.yml
new file mode 100644
index 0000000..83649b9
--- /dev/null
+++ b/.github/workflows/pixi.yml
@@ -0,0 +1,28 @@
+name: Pixi
+
+on:
+  workflow_dispatch:
+  pull_request:
+  push:
+    branches:
+      - main
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: prefix-dev/setup-pixi@v0.8.1
+        with:
+          environments: dev
+          cache: true
+          cache-write:
+            ${{ github.event_name == 'push' && github.ref_name == 'main' }}
+
+      - name: Run Pytest
+        env:
+          MAXAR_API_KEY: ${{ secrets.MAXAR_API_KEY}}
+        run: |
+          pixi run postinstall
+          pixi run networktest
diff --git a/src/coincident/overlaps/__init__.py b/src/coincident/overlaps/__init__.py
new file mode 100644
index 0000000..718b794
--- /dev/null
+++ b/src/coincident/overlaps/__init__.py
@@ -0,0 +1,64 @@
+"""
+Functions for refining search results based on spatial and temporal overlaps
+"""
+
+from __future__ import annotations
+
+import geopandas as _gpd
+import pandas as _pd  # noqa: ICN001
+
+
+def subset_by_maximum_duration(
+    gf: _gpd.GeoDataFrame,
+    max_duration: int = 60,  # days
+) -> _gpd.GeoDataFrame:
+    """
+    Subset a GeoDataFrame by a maximum duration.
+
+    Parameters
+    ----------
+    gf : _gpd.GeoDataFrame
+        The input GeoDataFrame containing a 'duration' column.
+    max_duration : int, optional
+        The maximum duration in days to filter the GeoDataFrame. Default is 60 days.
+
+    Returns
+    -------
+    _gpd.GeoDataFrame
+        A GeoDataFrame filtered to include only rows where the 'duration' is less than or equal to the specified maximum duration.
+    """
+    max_duration = _pd.Timedelta(max_duration)
+    # NOTE: keep indexes?
+    return gf.loc[gf.duration <= max_duration, :].reset_index()
+
+
+def subset_by_temporal_overlap(
+    gf: _gpd.GeoDataFrame,
+    start_datetime: _pd.Timestamp,
+    end_datetime: _pd.Timestamp,
+    temporal_buffer: int = 14,
+) -> _gpd.GeoDataFrame:
+    """
+    Subset a DataFrame based on temporal overlap.
+
+    Parameters:
+    gf (DataFrame): The input DataFrame with a datetime column.
+    start_datetime (Timestamp): The start datetime for the overlap.
+    end_datetime (Timestamp): The end datetime for the overlap.
+    temporal_buffer (int): The buffer to apply to the start and end datetimes.
+
+    Returns:
+    DataFrame: A subset of the input DataFrame with rows that overlap temporally.
+    """
+    temporal_buffer = _pd.Timedelta(temporal_buffer)
+    # Apply temporal buffer to collection start and end dates
+    buffered_start = gf.start_datetime - temporal_buffer
+    buffered_end = gf.end_datetime + temporal_buffer
+
+    results_intervals = _gpd.pd.IntervalIndex.from_arrays(
+        buffered_start, buffered_end, closed="both"
+    )
+    search_interval = _gpd.pd.Interval(start_datetime, end_datetime, closed="both")
+    keep = results_intervals.overlaps(search_interval)
+
+    return gf.loc[keep, :].reset_index()