diff --git a/II/Referatas/sinewave.py b/II/Referatas/sinewave.py
new file mode 100755
index 0000000..74f1ca5
--- /dev/null
+++ b/II/Referatas/sinewave.py
@@ -0,0 +1,25 @@
+#!/usr/bin/python
+from pyproj import CRS
+import numpy as np
+import geopandas as gpd
+from shapely.geometry import LineString
+
+INTERVAL = 0.5
+TAIL_LEN = 4
+SINE_LEN = 7
+
+
+def main():
+    tails = np.zeros(int(TAIL_LEN / INTERVAL))
+    amplitude = np.sin(np.arange(0, SINE_LEN, INTERVAL))
+    y = np.concatenate([tails, amplitude, tails])
+    x = np.arange(-TAIL_LEN, SINE_LEN+TAIL_LEN, INTERVAL)
+    geom = LineString(zip(x, y))
+    df = gpd.GeoDataFrame(crs=CRS(3346))
+    df['geometry'] = None
+    df.loc[0, 'geometry'] = geom
+    df.to_file("sinewave.json", driver='GeoJSON')
+
+
+if __name__ == '__main__':
+    main()