diff --git a/scripts/download_satellite.py b/scripts/download_satellite.py
index d0f083c..518dea6 100755
--- a/scripts/download_satellite.py
+++ b/scripts/download_satellite.py
@@ -6,29 +6,36 @@
 import os
 import urllib.request
 from PIL import Image
+from concurrent.futures import ThreadPoolExecutor
 
 MAX_ZOOM=20
 
-current, total = 0, (4 ** (MAX_ZOOM - 11) - 1)//3
+def download_all():
+    current, total = 0, (4 ** (MAX_ZOOM - 11) - 1)//3
+    with ThreadPoolExecutor() as executor:
+        for z in range(12, MAX_ZOOM + 1):
+            scale = 2 ** (z - 12)
+            start_x = 985 * scale
+            start_y = 1432 * scale
+            for x in range(start_x, start_x + scale):
+                for y in range(start_y, start_y + scale):
+                    executor.submit(download_image, z, x, y, total, current)
+                    current += 1
 
-for z in range(12, MAX_ZOOM+1):
-    scale = 2 ** (z - 12)
-    start_x = 985 * scale
-    start_y = 1432 * scale
-    for x in range(start_x, start_x + scale):
-        for y in range(start_y, start_y + scale):
-            current += 1
-            progress = f"[{current:0{len(str(total))}d}/{total}]"
-            url = f"https://svc.pictometry.com/Image/D2B06344-7A2D-5BD0-FC89-DFDDC9888C41/wmts/PICT-MNITAS23-EDVs7UTOVt/default/GoogleMapsCompatible/{z}/{x}/{y}.png"
-            file = os.path.normpath(os.path.join(os.path.dirname(__file__), f"../satellite/{z}/{x}/{y}.png"))
-            os.makedirs(os.path.dirname(file), exist_ok=True)
-            if os.path.isfile(file):
-                try: # does it already exist and look good?
-                    Image.open(file).verify() # CRC check on PNGs; nothing on other file types? https://pillow.readthedocs.io/en/latest/_modules/PIL/PngImagePlugin.html#ChunkStream.verify
-                    print(f"{progress} {file} already exists; skipping")
-                    continue
-                except OSError as e:
-                    print(f"{progress} replacing corrupt {file}")
-            else:
-                print(f"{progress} downloading {file}")
-            urllib.request.urlretrieve(url, file)
+def download_image(z, x, y, total, current):
+    progress = f"[{current:0{len(str(total))}d}/{total}]"
+    url = f"https://svc.pictometry.com/Image/D2B06344-7A2D-5BD0-FC89-DFDDC9888C41/wmts/PICT-MNITAS23-EDVs7UTOVt/default/GoogleMapsCompatible/{z}/{x}/{y}.png"
+    file = os.path.normpath(os.path.join(os.path.dirname(__file__), f"../satellite/{z}/{x}/{y}.png"))
+    os.makedirs(os.path.dirname(file), exist_ok=True)
+    if os.path.isfile(file):
+        try: # does it already exist and look good?
+            Image.open(file).verify() # CRC check on PNGs; nothing on other file types? https://pillow.readthedocs.io/en/latest/_modules/PIL/PngImagePlugin.html#ChunkStream.verify
+            print(f"{progress} {file} already exists; skipping")
+            return
+        except OSError as e:
+            print(f"{progress} replacing corrupt {file}")
+    else:
+        print(f"{progress} downloading {file}")
+    urllib.request.urlretrieve(url, file)
+
+download_all()