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:
|perimeter_ratio||The ratio of the parcel’s perimeter to its area suggest this parcel is part of a street network or other “spiderweb”|
|hull_ratio||The ratio of the parcel’s area to the area of a convex hull drawn around the parcel suggest this parcel is part of a street network|