New classes: soil layer, soil layer top, soil layer top depth, soil layer bottom, soil layer bottom depth

[celineaubert]

soil layer

• subclassOf layer; http://purl.obolibrary.org/obo/ENVO_01000281
• definition Layer in the soil which is parallel to the soil surface and possesses physical characteristics which differ from the layers above and beneath.
• database cross_reference:
  • http://www.cs.mcgill.ca/~rwest/link-suggestion/wpcd_2008-09_augmented/wp/s/Soil_horizon.htm
  • https://en.wikipedia.org/wiki/Soil_horizon
• exact_synonym soil horizon

soil layer top

• subclassOf soil layer?;
• definition Superior limit of the soil layer.
• exact_synonym soil horizon top limit

soil layer top depth

• subclassOf depthPATO_0000122
• subclassOf inheres in soil layer top;
• definition A depth which inheres in the top of a soil layer.

soil layer bottom

• subclassOf soil layer?;
• definition Inferior limit of the soil layer.
• exact_synonym soil horizon bottom limit

soil layer bottom depth

• subclassOf depthPATO_0000122
• subclassOf inheres in soil layer bottom;
• definition ` A depth which inheres in the bottom of a soil layer.