Common Differences

FlowMap R

PitAreas sometimes larger because of LITAP works with elevation slices. PitArea is all cells upto PourElev. LandMapR worked by spiralling up the cells. PitArea is total area up to PourPoint cell (not necessarily all cells at the PourElev)
Nextpit is often incorrect for Pond Data (not sure why)
DrainsTo isn’t always updated in original LandMapR (not sure if represents something missing in LITAP or bug in LandMapR)
Exact location of pour point between two watersheds is sometimes off by a cell or two (out rec and in rec) due to tie breaking
PitRecs in big patches of equal elevation are in the centre of the patch in LITAP, but at the bottom of the patch in FlowMapR
Sometimes rounding difference on the InElev and/or PourElev.

The calculations for Vol2Fl/mm2fl/parea are sometimes off, if the upslope calculations are slightly different (generally due to tie breaking)

DrainsTo in LITAP is a real shed, whereas in FlowMapR it is often 0, not sure of why the differences

Underlying differences in upslope area can have cascade effects on form_mapper() calculations
The total area of a given cell can sometimes be off between LITAP and FormMapR due to in tie-breaking determining which cell is evaluated first.