Usually the roof poles lie on each lath junctions, which is arranged as crossed lattice.
Modern yurts disregard this approach and lie the roof poles on the rope which holds
the wall / khana together, this way one is very flexible to build with given parts
(e.g. wall / khana, crown-wheel / toono etc) multiple sized yurts, but you
sacrifice some of the stability of the lattice wall.
Traditionally and also for stability the wall lattice is spread so the crossing laths
relate in 90° (αkhana) angle, but you may have a shorter angle like 60-80° and
have with shorter laths a higher wall.