[OSM-talk] why does mapnik not display my circles?

[Kenneth Gonsalves]

hi,

I am building a map using mapnik with India specific features. The idea is that 
the data will be in the osm database, but India specific features will only 
show on my server. One important thing here is that food is strictly divided 
into vegetarian and non-vegetarian. The law mandates that all food items 
should have either a green circle or a red one to show food type. There are 
areas in the country where it is very difficult to find a non-veg restaurant (and 
often considered impolite to enquire where one is). Since this is not specific 
to restaurants - it covers all shops that deal in food, I made a new tag 
called food=veg and food=nveg with either a green or red circle. The problem 
is that the data is there in the database, but it is not getting rendered. I 
then noticed that mapnik does not render everything - there appears to be some 
logic which prevents overwriting, so some things are rendered and others are 
left out. This could be solved by having a higher zoom - or by tinkering with 
the logic. I would expect a higher zoom would be the best way to go. I have 
set numZoomLevels: 25, but the tool only shows the max as 18. How do I change 
this? I am using openlayers with mod_tile. The map in question is here:

http://xlquest.net/?zoom=18&lat=12.94659&lon=80.13845&layers=B

opening the area in Josm shows that the food=veg and food=nveg tags are there.
-- 
regards
Kenneth Gonsalves
Senior Project Officer
NRC-FOSS
http://nrcfosshelpline.in/web/