Changed to use dx instead of node_spacing.
Changed to use dx instead of node_spacing.

Carralex/landlab,ManuSchmi88/landlab,ManuSchmi88/landlab,landlab/landlab,laijingtao/landlab,SiccarPoint/landlab,laijingtao/landlab,ManuSchmi88/landlab,csherwood-usgs/landlab,amandersillinois/landlab,Carralex/landlab,RondaStrauch/landlab,amandersillinois/landlab,RondaStrauch/landlab,RondaStrauch/landlab,Carralex/landlab,SiccarPoint/landlab,landlab/landlab,cmshobe/landlab,landlab/landlab,cmshobe/landlab,csherwood-usgs/landlab,cmshobe/landlab