Skip GSD and size filtering without altitude

src/ai_config.pyx

@@ -25,7 +25,8 @@ cdef class AIRecognitionConfig:
 
         self.big_image_tile_overlap_percent = big_image_tile_overlap_percent
 
-        self.altitude = altitude
+        self.has_altitude = altitude is not None
+        self.altitude = 0.0 if altitude is None else float(altitude)
         self.focal_length = focal_length
         self.sensor_width = sensor_width
 
@@ -36,7 +37,7 @@ cdef class AIRecognitionConfig:
                 f'frame_period_recognition : {self.frame_period_recognition}, '
                 f'big_image_tile_overlap_percent: {self.big_image_tile_overlap_percent}, '
                 f'model_batch_size: {self.model_batch_size}, '
-                f'altitude: {self.altitude}, '
+                f'altitude: {self.altitude if self.has_altitude else None}, '
                 f'focal_length: {self.focal_length}, '
                 f'sensor_width: {self.sensor_width}'
                 )
@@ -56,7 +57,7 @@ cdef class AIRecognitionConfig:
 
             data.get("big_image_tile_overlap_percent", 20),
 
-            data.get("altitude", 400),
+            data.get("altitude", None),
             data.get("focal_length", 24),
             data.get("sensor_width", 23.5)
         )