Z orders:
0 - Underground petroleum 20 - Underground water 40 - Underground telecoms 60 - Underground power
100 - Petroleum landuse 120 - Water landuse 140 - Telecoms landuse 160 - Power landuse
200 - Overhead petroleum (?) 220 - Overhead water (?!) 240 - Overhead telecoms 260 - Overhead power
500 - Petroleum labels 520 - Water labels 540 - Telecoms labels 560 - Power labels