GROUP: greenhouse (gh)
DEFINITION: greenhouses & horticultural builtup areas with plants in pots, benches or under cover, in use or >50% cover

1. Object
   1. earth & plastic greenhouses = earth wall structure with plastic cover (semi-permanent), plastic may be opened during hot season.
   2. glass or plastic greenhouses = permanent glass or plastic/metal structure: does not include temporary plastic/metal greenhouses.
   3. open-air horticultural area = non-enclosed permanent structure open to sky, used for production of plants in pots or other artificial media, not in soil.
   4. roofed horticultural area = permanent roof-covered (rain does not penetrate), but not fully-enclosed structure, used for production of plants in pots or other artificial media, not in soil.
2. Modifier 1 (structure type)
   1. permeable floor = floors of earth, may be compacted or covered with permeable temporary surface with some water penetration.
   2. sealed floor = floor covered by permanent impermeable surface such as concrete or heavy plastic.
3. Scale
   1. small <30 m
   2. large >30 m

1. earth & plactic greenhouses
   1. permeable floor
      1. small <30 m = gh01
      2. large >30 m = gh02

1. glass or plastic greenhouses
   1. sealed floor
      1. small <30 m = gh03
      2. large >30 m = gh04

1. open-air horticultural area
   1. sealed floor
      1. small <30 m = gh05
      2. large >30 m = gh06
   2. permeable floor
      1. small <30 m = gh07
      2. large >30 m = gh08

1. roofed horticultural area
   1. sealed floor
      1. small <30 m = gh09
      2. large >30 m = gh10
   2. permeable floor
      1. small <30 m = gh11
      2. large >30 m = gh12

1. IF TYPE with greater area is very similar or otherwise unclear:
   1. Choose earth & plastic greenhouses over glass or plastic greenhouses over open-air horticultural area over roofed horticultural area.
   2. Choose permeable floor over sealed floor.

FORM:

USE:

COVER:

TYPE: