Hey guys,

I'm using the following code in generate_tiles.py

minZoom = 10
maxZoom = 18
bbox=(103.830113, 1.305715, 103.833557, 1.302637)
render_tiles(bbox, mapfile, tile_dir, minZoom, maxZoom, "TEST")

But I'm not seeing tiles beyond level 16 being generated. If I look in the
tiles output folder I can see the relevant folders but there are no images
within the folders.

Output looks like:

render_tiles( (103.830113, 1.305715, 103.833557, 1.302637) osm.xml
/mnt/shared/TEMP/tiles/ 10 18 TEST )
TEST  : 11 1614 1016 exists
TEST  : 10 807 508 exists
TEST  : 13 6458 4066 exists
TEST  : 12 3229 2033 exists
TEST  : 14 12917 8132 exists
TEST  : 15 25834 16265 exists
TEST  : 16 51670 32530 exists
TEST  : 15 25835 16265 exists
TEST  : 16 51669 32530 exists

Within the folder /mnt/shared/TEMP/tiles/18 there are 5 sub-folders but they
are devoid of content.

If I use a **larger** bounding box then I get these lower levels.

Does anyone have some good tips to start me off on how to correct this?
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