sloping vs upslope

sloping

adj

  • Having a slope. 

  • a sloping roof 

noun

  • An arrangement or motion by which something slopes. 

upslope

adj

  • in a direction up a slope 

noun

  • an upward slope 

adv

  • up a slope 

How often have the words sloping and upslope occurred in a corpus of books? (source: Google Ngram Viewer )