Regrid Status

Right-of-way Parcels

Right–of-way, or ROW parcels, track land that is typically used for movement, transportation, or utilities.

Our ROW implementation, in the ll_row_parcel field, identifies ROW parcels by a variety of methods and is available in our premium dataset. We expect to iterate on this first implementation over time.

Rights-of-way are helpful to have identified for multiple reasons:

  • ROWs typically do not have an address or buildings associated with them. Excluding them from analyses where this is important can improve quality.
  • For some use-cases, like utilities, knowing rights-of-ways is important, so we do not typically remove them from our dataset.
  • Large, twisty “spiderweb” ROWs with many vertices can cause problems with geoprocessing. These typically represent a large network of roads. In cases where we identify processing problems, we remove them from our dataset

Example ROW parcels

Example ROWs following a highway in Frederick, MD:

Spiderweb ROW in Abbeville, SC:

ll_row_parcel attribute values

We combine a number of heurestics to determine if a parcel is a ROW. The criteria used for the determination is stored in the ll_row_parcel field. Each of these criteria is also combined with logic to identify public and homeowner’s association-type owners to minimize false positives:

Value Definition
parcel_number parcelnumb contains “row”, “road”, or other relevant identifiers
land_use usedesc contains “row”, “road”, etc.
perimeter_ratio high perimeter-squared-to-area ratio (>2000)
hull_ratio high convex-hull-to-area ratio (>2)