Update app.py

app.py

@@ -115,11 +115,12 @@ def get_dem_slope_maps(buffer_ee_geometry):
     dem_layer = ee.Image("USGS/SRTMGL1_003").clip(buffer_ee_geometry)  
     
     # Generate contour lines using elevation thresholds
+    terrain = ee.Algorithms.Terrain(dem_layer)
     contour_interval = 10
     contours = terrain.select('elevation').subtract(terrain.select('elevation').mod(contour_interval)).rename('contours')
 
     # Calculate the minimum and maximum values
-    stats = dem_layer.reduceRegion(reducer=ee.Reducer.minMax(),scale=30,maxPixels=1e13)
+    stats = contours.reduceRegion(reducer=ee.Reducer.minMax(),scale=30,maxPixels=1e13)
     
     # Print the results
     max_value = stats.get('contours_max').getInfo()