### Instruction:

Extract the cause and effect entities from the following sentence:
For selecting locations where R-based validation is to be carried out, a key criterion is the spatial homogeneity and temporal stability of the surface in terms of emissivity

### Assistant:

KEYWORD: where
CONDITION: temporal stability of the surface in terms of emissivity
VARIABLE: a key criterion
AND: and
CAUSE_1: selecting locations
CAUSE_2: R-based validation is to be carried out
EFFECT_1: a key criterion is the spatial homogeneity
EFFECT_2: temporal stability of the surface in terms of emissivity

