New collection defined for pixel data

src/engine/InterestManagement/HeightMap.java

@@ -35,6 +35,9 @@ public class HeightMap {
     // Class variables
 
     public static final HashMap<Integer, HeightMap> heightmapByLoadNum = new HashMap<>();
+
+    public static final HashMap<Integer, byte[][]> _pixelData = new HashMap<>();
+
     // Heightmap data for all zones.
     public static float SCALEVALUE = 1.0f / 255;