Update app.py

app.py

@@ -20,6 +20,11 @@ ui.input_select("center", "Center", choices=list(city_centers.keys()))
 def map():
     m = ipyleaflet.Map(zoom=4)
     dem = ee.Image("USGS/SRTMGL1_003")
+    vis_params = {
+        "min": 0,
+        "max": 4000,
+        "palette": ["006633", "E5FFCC", "662A00", "D8D8D8", "F5F5F5"],
+    }
     tile = geemap.ee_tile_layer(dem, vis_params, "SRTM DEM")
     url = tile.url
     layer = ipyleaflet.TileLayer(url, attribution="Google", name="DEM")