Tech Preview Data Dictionary: Elements Roadway

Today, roadway information is primarily managed and visualized utilizing geospatial databases and GIS software with road features described by polylines, points and polygon objects. The data schema for Elements - Roadway is to provide vector geometry and associated attribute information about an AI detected element and the source imagery used for analysis.

Parameter	Data Type	Description	Example Format	Notes

Parameter	Data Type	Description	Example Format	Notes
`long`	number	Longitude of bounding box centroid.	`long=-78.03648009896278`
`lat`	number	Latitude of bounding box centroid.	`lat=35.40247099283459`
`id`	string	Unique feature id.	`id=b149559b-2f8c-11ee-aeea-2552c67c4ca1`
`category`	string	Element categorization. `ada` - Accessibility features such as detectable warnings and pavement markings related to requirements of Title II of the Americans with Disabilities Act (ADA). `arrow` - Arrow pavement markings as listed in the Manual on Uniform Traffic Control Devices (MUTCD) 2009 Edition. `bicycle` - Pavement markings installed to provide guidance for bicyclists travelling the roadway. `crosswalk` - Pavement markings installed to provide guidance for pedestrians who are crossing roadways. `intersection-junction` - Curbs and other roadway elements commonly installed to define or improve safety at an intersection or junction. `railroad` - Grade crossing pavement markings. `stop` - Stop and yield line pavement markings. `symbol` - Symbol pavement markings such as route shields. `text` - Word pavement markings.	`category=crosswalk`
`name`	string	Name of roadway element. category=`ada` `Accessibility symbol (wheelchair)` - International symbol of accessibility parking space marking, with or without blue background. `ADA curb mat` - Detectable curb mat (truncated dome) category=`arrow` `Lane reduction arrow` - Lane reduction arrow. `Left turn arrow` - Left turn lane-use arrow. `Right/left arrow` - Right and left turn lane-use arrow. `Right turn arrow` - Right turn lane-use arrow. `Straight arrow` - Through lane-use arrow. `Straight/left arrow` - Left turn and through lane-use arrow. `Straight/right arrow` - Right turn and through lane-use arrow. `Three way arrow` - Right, left and through lane-use arrow. `Uturn arrow` - Uturn arrow. category=`bicycle` `bicycle symbol` - Bicycle Symbol and Helmeted Bicycle Symbol markings. `green marking (bicycle)` - Green colored asphalt or concrete, or paint or other marking materials applied to the surface of a road to indicate a bicycle lane. `shared lane (bicycle)` - Bicycle symbol marking with double chevrons indicating a shared use lane. category=`crosswalk` `standard crosswalk` - Marked crosswalk with longitudinal lines parallel to traffic flow. `ladder crosswalk` - High visibility marked crosswalk with longitudinal and transverse line markings. `diagonal crosswalk` - Marked crosswalk with diagonal lines at a 45-degree angle to the line of the crosswalk. `solid crosswalk` - Marked crosswalk with colored pavements between longitudinal line markings. `zebra crosswalk` - High visibility marked crosswalk with longitudinal line markings parallel to traffic flow. aka continental crosswalk. category=`intersection-junction` `Pedestrian island` - Islands or medians placed in the center area of a street that can serve as a place of refuge for pedestrians who are attempting to cross at a midblock or intersection location. `Roundabout` - The central island of a circular intersection design where traffic travels around a central island. category=`railroad` `Railroad crossing` - Railroad crossing (X) symbol category=`stop` `Stop bar` - Solid white lines extending across approach lanes to indicate the point at which the stop is intended or required to be made. `Yield bar` - Yield line (triangular) marking. category=`symbol` `Double chevron` - Double chevron markings generally used to denote continuation or direction of travel for a bicycle lane. `Other symbol` - Route shield and other markings. `Speed hump` - Speed hump (triangular) marking. category=`text` `AHEAD text` `BUS text` `LANE text` `ONLY text` `Other text` `PED text` `SCHOOL text` `SIGNAL text` `SLOW text` `STOP text` `XING text` `YIELD text`	`name=ladder crosswalk`	Pavement markings as listed in the Manual on Uniform Traffic Control Devices (MUTCD) 2009 Edition.
`type`	string	Type of roadway element. `pavement_marking` - Pavement markings and colored pavements. `infrastructure` - Structural roadway elements.	`type=pavement_marking`
`quality_score`¹	number	Quality score of pavement marking. `1` - Poor. Pronounced signs of defects that can significantly affect the function of the pavement marking. `2` - Fair. Pronounced signs of defects that can affect the function of the pavement marking. `3` - Good. Minimal visible signs of defects. `4` - Great. No visible signs of defects.	`number=2`
`confidence`	number	AI confidence score. Range between 0 and 1. `0` = lowest confidence. `1` = highest confidence.	`confidence=0.92`	Positive numbers between 0 - 1.
`area`	number	Bounding box area (square meters).	`area=10318`
`crossing_distance`²	number	Calculated distance. Pedestrian crossing distance (meters).	`crossing_distance=8.2`
`method`²	string	Method used to calculate crossing distance. `curb2curb` - Length calculated from a line drawn between opposing ADAcurbmat bounding box centroids. `curb2center` - Length calculated from a line drawn across the road starting at an ADAcurbmat centroid and through a crosswalk centroid, clipped by the crosswalk bounding box. `center` - Length calculated using a crossing line drawn through the crosswalk bounding box centroid and perpendicular to a street centerline LineString, clipped by the crosswalk bounding box. `diagonal` - Length of a line drawn between opposing corners on the longest sides the crosswalk bounding box.	`method=center`
`source`	string	Source of imagery and feature extractions.	`source=©2023 Vexcel Imaging US, Inc.`
`layer`	string	Vexcel image product used for analysis. `bluesky-ultra` - TrueOrtho 7.5cm GSD imagery. `urban-r` - Urban Ortho 7.5cm GSD imagery. `bluesky-high` - Wide Area Ortho 15cm GSD imagery.	`layer=bluesky-ultra`
`coverage_type`	string	Type of image product.	`coverage_type=final-ortho`
`camera_technology`	string	Vexcel camera model and version used for data collection.	`camera_technology=UltraCam_Osprey_4.1_f120`
`aoi`	string	Vexcel data collection parent area name.	`aoi=us-nc-goldsboro-2022`
`child_aoi`	string	Vexcel data collection child area name.	`child_aoi=us-nc-goldsboro-2022`
`min_gsd`	number	Minimum ground sampling distance (meters) of image tile.	`min_gsd=0.0674`
`max_gsd`	number	Maximum ground sampling distance (meters) of image tile.	`max_gsd=0.0761`
`min_capture_date`	date	The start date of image capture for the `child_aoi` (m/d/yyyy h:mm).	`capture_date_min=4/12/2023 17:43`
`max_capture_date`	date	The end date for image capture for the `child_aoi` (m/d/yyyy h:mm).	`capture_date_max=4/20/2023 15:50`
`estimated_date`	date	The collection date of the nadir image most centered over the road element location.	`estimated_date=4/19/2023 15:15`
`process_date`	date	Date imagery analyzed by Vexcel algorithms (m/d/yyyy h:mm).	`process_date=10/24/2023 13:37`
`bbox_wkt`	string	Bounding box geometry in Well-known text (WKT) format.	`bbox_wkt=POLYGON ((-78.03650557994843 35.40243437169849, -78.03645394742489 35.40243437169849, -78.03645394742489 35.402507613970684, -78.03650557994843 35.402507613970684, -78.03650557994843 35.40243437169849))`
`crossing_wkt`²	string	Linestring geometry in Well-known text (WKT) format.	`crossing_wkt=LINESTRING (-78.0364855001585767 35.4024343716984902, -78.0364746950528598 35.4025076139706840)`
Condition scoring based on white and yellow pavement markings. Available with crosswalk elements.
Updated 2023-12-04. ©2023 Vexcel Imaging US, Inc.