Fix DEM legend

app.py

@@ -151,7 +151,7 @@ def get_dem_slope_maps(buffer_ee_geometry):
     )
 
     # Calculate the minimum and maximum values
-    stats = contours.reduceRegion(reducer=ee.Reducer.minMax(), scale=30, maxPixels=1e13)
+    stats = contours.reduceRegion(reducer=ee.Reducer.minMax(), scale=10, maxPixels=1e13)
     max_value = stats.get("contours_max").getInfo()
     min_value = stats.get("contours_min").getInfo()
     vis_params = {"min": min_value, "max": max_value, "palette": ["blue", "green", "yellow", "red"]}
@@ -186,14 +186,21 @@ def get_dem_slope_maps(buffer_ee_geometry):
         .rename("slope")
     )
     # Calculate the minimum and maximum values
-    stats = slope_layer.reduceRegion(reducer=ee.Reducer.minMax(), scale=30, maxPixels=1e13)
+    stats = slope_layer.reduceRegion(reducer=ee.Reducer.minMax(), scale=10, maxPixels=1e13)
     max_value = stats.get("slope_max").getInfo()
     min_value = stats.get("slope_min").getInfo()
     vis_params = {"min": min_value, "max": max_value, "palette": ["blue", "green", "yellow", "red"]}
     slope_map.addLayer(slope_layer, vis_params, "Slope Layer")
     # Create a colormap
     colormap = cm.LinearColormap(colors=vis_params["palette"], vmin=vis_params["min"], vmax=vis_params["max"])
-    slope_map.add_child(colormap)
+    #slope_map.add_child(colormap)
+    tick_size=int((max_value-min_value)/4)
+    slope_map.add_legend(title="Slope (degrees)",
+                                legend_dict={'{}-{} m'.format(min_value, min_value+tick_size): '#0000FF',
+                                             '{}-{} m'.format(min_value+tick_size, min_value+2*tick_size): '#00FF00',
+                                             '{}-{} m'.format(min_value+2*tick_size, min_value+3*tick_size): '#FFFF00',
+                                             '{}-{} m'.format(min_value+3*tick_size, max_value): 'FF0000'},
+                                position='bottomright')
     return dem_map, slope_map