diff --git a/src/pangea/client.py b/src/pangea/client.py
new file mode 100644
index 0000000..902d372
--- /dev/null
+++ b/src/pangea/client.py
@@ -0,0 +1,10 @@
+import re
+from urllib.parse import urlparse, urlunparse
+
+
+def pangea_expanded_image_url(url: str) -> str:
+    parsed = urlparse(url)
+    if parsed.netloc.startswith("gdb.") and parsed.path.endswith(".jpg"):
+        path = re.sub(r"_w[0-9]+_", "_w600_", parsed.path)
+        return urlunparse(parsed._replace(path=path))
+    return url