diff --git a/.gitignore b/.gitignore
index 971098d..ada4a49 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,43 @@
+# Project data
 data/*
+
+# Environment
 .env
-venv
\ No newline at end of file
+.venv
+venv/
+env/
+
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+
+# Testing & coverage
+.pytest_cache/
+.coverage
+htmlcov/
+.tox/
+
+# Linting & type checking
+.ruff_cache/
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Distribution / packaging
+build/
+dist/
+*.egg-info/
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db
diff --git a/data/sites.geojson b/data/sites.geojson
new file mode 100644
index 0000000..7eb5dff
--- /dev/null
+++ b/data/sites.geojson
@@ -0,0 +1,132 @@
+{
+  "type": "FeatureCollection",
+  "features": [
+    {
+      "type": "Feature",
+      "geometry": {
+        "type": "Point",
+        "coordinates": [
+          25.0743,
+          35.3045
+        ]
+      },
+      "properties": {
+        "country": "",
+        "seasons": {
+          "2024": {}
+        },
+        "elevation": 68,
+        "description": "FORTH Heraklion Greece",
+        "sitename": "forthgr",
+        "ndvi_selected": true,
+        "vegetation_type": "Agriculture"
+      }
+    },
+    {
+      "type": "Feature",
+      "geometry": {
+        "type": "Point",
+        "coordinates": [
+          11.320308,
+          47.116171
+        ]
+      },
+      "properties": {
+        "country": "",
+        "seasons": {
+          "2020": {},
+          "2024": {}
+        },
+        "elevation": 972,
+        "description": "Neustift Field Site, Stubai Valley, Tyrol, Austria",
+        "sitename": "innsbruck",
+        "ndvi_selected": true,
+        "vegetation_type": "Grassland"
+      }
+    },
+    {
+      "type": "Feature",
+      "geometry": {
+        "type": "Point",
+        "coordinates": [
+          24.3688,
+          58.5633
+        ]
+      },
+      "properties": {
+        "country": "",
+        "seasons": {
+          "2024": {}
+        },
+        "elevation": 3,
+        "description": "Abandoned peat extraction area, Estonia",
+        "sitename": "pitsalu",
+        "ndvi_selected": true,
+        "vegetation_type": "Wetland"
+      }
+    },
+    {
+      "type": "Feature",
+      "geometry": {
+        "type": "Point",
+        "coordinates": [
+          19.7673,
+          64.2437
+        ]
+      },
+      "properties": {
+        "country": "",
+        "seasons": {
+          "2023": {}
+        },
+        "elevation": 224,
+        "description": "SITES Svartberget Research Station, Vindeln, Sweden",
+        "sitename": "vindeln2",
+        "ndvi_selected": true,
+        "vegetation_type": "Deciduous Broadleaf"
+      }
+    },
+    {
+      "type": "Feature",
+      "geometry": {
+        "type": "Point",
+        "coordinates": [
+          -6.0033,
+          36.7455
+        ]
+      },
+      "properties": {
+        "country": "",
+        "seasons": {
+          "2024": {}
+        },
+        "elevation": 56,
+        "description": "Sun flower plot, Jerez, Spain",
+        "sitename": "sunflowerjerez1",
+        "ndvi_selected": true,
+        "vegetation_type": "Agriculture"
+      }
+    },
+    {
+      "type": "Feature",
+      "geometry": {
+        "type": "Point",
+        "coordinates": [
+          26.9837,
+          42.6558
+        ]
+      },
+      "properties": {
+        "country": "",
+        "seasons": {
+          "2024": {}
+        },
+        "elevation": 262,
+        "description": "Institute of Agriculture in Karnobat (selection fields)",
+        "sitename": "institutekarnobat",
+        "ndvi_selected": true,
+        "vegetation_type": "Agriculture"
+      }
+    }
+  ]
+}
\ No newline at end of file