Core Attributes These attributes are common across all feature classes extracted as part of the SWAAI project where applicable.

• UniqueID Unique ID for this feature type, assigned by Cyclomedia staff.

• RouteID Route ID based on ITD’s Esri Roads & Highways linear referencing system (LRS). A copy of ITD’s LRS network was provided to Cyclomedia.

• RouteDirectionCode Travel direction of nearest highway lane to feature, ascending (A) or descending (D).

• Measure or FromMeasure/ToMeasure LRS measure (in the case of discrete point features) or from/to LRS measures (in the case of line or polygon features) based on ITD’s Esri Roads & Highways LRS.

• SideOfRoad Side of road location of feature, generally L (left) or R (right). Values for B (both), C (center), and N (neither) were also included as text domain values for use where applicable.

• X/Y/Z or From_X/To_X/From_Y/To_Y/From_Z/To_Z Longitude (X), Latitude (Y), and Elevation (Z) values were included for each extracted feature (X/Y/Z for discrete points, to/from X/Y/Z for lines and polygons) Rather than the metric northing/easting present in the Idaho Transverse Mercator (IDTM, WKID: 8826) projection, the projection used for all SWAAI datasets, X and Y are decimal-degree latitude/longitude. The elevation field, Z, is in U.S. feet.

• StreetSmartLink URL link to the feature’s location in Cyclomedia’s browser-based Street Smart photo and LiDAR depth surface viewer. Following the link brings the user directly to the closest Street Smart collection location and angles the view to look directly at the feature in the 360° photograph.

• Comments General comments field.

• CollectedDate Date the feature was observed and field-collected by Cyclomedia during the vehicle-based data collection process.

Key Attributes These attributes are unique to this feature class, or are Core Attributes used differently than other feature classes extracted as part of the SWAAI project.

• ShoulderType General shoulder type, including the ShoulderType domain, with the following coded domain values:

  • Asphalt/Polymer (1) Shoulder area is comprised of either asphalt or polymer materials designed to resemble asphalt.

  • Concrete (2) Shoulder area is comprised of concrete.

  • Unpaved (3) Shoulder area is unpaved.

  • Combination (Paved and Unpaved) (4) Shoulder is a combination of paved (asphalt, polymer, or concrete) and unpaved area.

  • Other (99) Shoulder area is a type other than asphalt/polymer, concrete, unpaved, or combination.

• ShoulderWidth_ft Average width of the shoulder feature, in U.S. feet, rounded to the nearest hundredth-foot. This width is defined as the width from the edge of the paint striping nearest the shoulder to the edge of the shoulder pavement. Extracted shoulder sections were broken into new records whenever the shoulder width changed by more than 1 foot average.

• EdgeType Type of edge on the shoulder. The shoulder edge is defined as the location where the slope becomes too steep to be considered a part of the shoulder. Includes the ShoulderEdgeType domain with the following coded domain values:

  • Curb/Gutter (1) Shoulder edge is curb and gutter.

  • Paved Ditch (2) Shoulder edge is paved ditch.

  • Gravel (3) Shoulder edge is gravel.

  • Wall (4) Shoulder edge is a constructed retaining wall.

  • Vertical Face (5) Shoulder edge is a vertical rock face.

  • Barrier (6) Shoulder edge is a barrier (guardrail).

  • Vegetated (7) Shoulder edge is vegetated. This value may overlap with gravel edges where vegetation has grown into the gravel.

  • None (98) Shoulder does not have a measureable edge, with its flat surface continuing beyond the vehicle-based collection area.

  • Other (99) Shoulder is a type other than those specifically listed in this attribute domain.

Spatial Reference All data extracted as part of the SWAAI project is projected to Idaho Transverse Mercator (WKID: 8826), using the NAD 1983 (WKID: 4269) geographic coordinate system. NAVD88 (WKID: 6360) was the vertical coordinate system used for all elevation measurements.