diff --git a/src/consts.h b/src/consts.h
index 7e6faad..80afde8 100644
--- a/src/consts.h
+++ b/src/consts.h
@@ -5,12 +5,6 @@
 #include <cmath>
 
 // --------------------------- Basic Constants ---------------------------
-// const int VOLUME_WIDTH  = 576;  // lon
-const int VOLUME_WIDTH  = 97;  // lon
-// const int VOLUME_HEIGHT = 361;  // lat
-const int VOLUME_HEIGHT = 71;  // lat
-const int VOLUME_DEPTH  = 42;  // lev
-
 const int INITIAL_WINDOW_WIDTH   = 1200;
 const int INITIAL_WINDOW_HEIGHT  = 900;
 
@@ -18,6 +12,16 @@ const double epsilon = 1e-10f;
 const double infty   = 1e15f;  // This value is used to represent missing values in data
 
 // --------------------------- Dataset Constants ---------------------------
+// const int VOLUME_WIDTH  = 576;  // lon
+const int VOLUME_WIDTH  = 97;  // lon
+// const int VOLUME_HEIGHT = 361;  // lat
+const int VOLUME_HEIGHT = 71;  // lat
+const int VOLUME_DEPTH  = 42;  // lev
+
+const float DLON = 60.0f / VOLUME_WIDTH;  // 60 for current trimmed data set range
+const float DLAT = 35.0f / VOLUME_HEIGHT;  // 35 for current trimmed data set range
+const float DLEV = 1000.0f / VOLUME_DEPTH;  // 1000 from max pressure (hPa) but not sure here
+
 const float MIN_TEMP = 210.0f;
 const float MAX_TEMP = 240.0f;