added binary to generate landmarks from geojson file

src/coordinates.rs

@@ -51,6 +51,7 @@ impl From<RadianCoordinate> for DegreeCoordinate {
     }
 }
 
+
 impl RadianCoordinate {
     /// Builds a RadianCoordinate from latitude and longitude given in
     /// degrees.
@@ -154,6 +155,20 @@ impl DegreeCoordinate {
 
         Ok(DegreeCoordinate{lat, lon})
     }
+
+
+    /// tries to parse a DegreeCoordinate from a GeoJSON Position
+    pub fn from_geojson_position(position: geojson::Position) -> Result<Self, String> {
+
+        if position.len() != 2 {
+            return Err("String has more than 2 values".to_string());
+        }
+
+        let lat = position[1];
+        let lon = position[0];
+
+        Ok(DegreeCoordinate { lat, lon })
+    }
 }
 
 /// normalizes longitude values given in radians to the range (-PI, PI]