diff --git a/modules/util/viirs.py b/modules/util/viirs.py
index e8da13dafa7fd112bcf01d6b07de963eafd691c8..d7c64d620bbc599b05c70a0d8361acccc5fc2bdc 100644
--- a/modules/util/viirs.py
+++ b/modules/util/viirs.py
@@ -16,7 +16,7 @@ def run_all(directory):
     img_tiles = []
 
     for idx, mfile in enumerate(mod_files):
-        if idx % 8 == 0:
+        if idx % 16 == 0:
             w_o_ext, ext = os.path.splitext(mfile)
             ifile = w_o_ext+'.highres'+ext
             if not os.path.exists(ifile):
@@ -60,7 +60,7 @@ 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 = 1
+    num_cntr_tiles = 2
     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):