Used when location_type selects a polygon extent (example: "statecd" or
"countycd"). The API returns HUC12s, and intersection controls which
HUC12s count as "inside".
Used when location_type selects a polygon extent (example: "statecd" or
"countycd"). The API returns HUC12s, and intersection controls which
HUC12s count as "inside".