atures for all physiographic regions
* Required attribute fields:
* ''NAME'' (Text)
* ''PHYS... for all NAIP quarter quad (QQ) tiles
* Required attribute field:
* ''FileName'' (Text)
* Examp... ars populated with the corresponding canopy value at each point.
Arguments:
* ''phyreg_ids'' (list ... the field name of ''GT'' (e.g., ''GT'').
- The attributes of the ''naip_layer'' are spatially joine