diff --git a/modules/util/viirs.py b/modules/util/viirs.py
index 4ae771a4c00d6488c3da4bdbfdb7d52916357c9a..95abfaea260340c3e391786c861ff73126071b5c 100644
--- a/modules/util/viirs.py
+++ b/modules/util/viirs.py
@@ -57,7 +57,7 @@ def run(mod_res_filename, img_res_filename, mod_tiles, img_tiles):
     mod_data = get_grid_values(mod_h5f, mod_param, 0, 0, None, mod_num_lines, mod_num_pixels, range_name=None)
     img_data = get_grid_values(img_h5f, img_param, 0, 0, None, img_num_lines, img_num_pixels, range_name=None)
 
-    num_cntr_tiles = 2
+    num_cntr_tiles = 1
     i_c = int(mod_num_pixels / num_cntr_tiles)  # center
     j_skip = int(mod_num_y_tiles / num_cntr_tiles) * mod_tile_width
     for k in range(num_cntr_tiles):