Elements Roadway: Data Dictionary

Parameter	Data Type	Description	Example Format	Notes
`long`	number	Longitude of bounding box centroid.	`long=-118.12998220324516`
`lat`	number	Latitude of bounding box centroid.	`lat=34.01481565143788`
`id`	string	Unique feature id.	`id=b790977e-9038-11ee-afd0-2552c67c4ca1`
`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) 11th 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. In conjunction with signs and other measures, crosswalk markings help to alert road users of a designated pedestrian crossing point. `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. `Detectable warning mat` - Detectable warning mats (truncated domes) used for Americans with Disabilities Act (ADA) compliance to indicate the boundary between pedestrian and vehicular routes where there is a flush instead of a curbed connection. 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. `shared lane (bicycle)` - Bicycle symbol marking with double chevrons indicating a shared use lane. category=`crosswalk` `transverse crosswalk` - Marked crosswalk with longitudinal lines parallel to traffic flow. `ladder crosswalk` - High visibility marked crosswalk with longitudinal and transverse line markings. `longitudinal bar crosswalk` - High visibility marked crosswalk with longitudinal line markings parallel to traffic flow, including bar pair designs. `solid crosswalk` - Marked crosswalk with colored pavements between longitudinal line markings. 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. Common circular intersection types including roundabouts, rotaries, and traffic circles are detected. category=`railroad` `Railroad crossing` - Railroad crossing (X) symbol `Railroad crossing extended` - Railroad crossing (X) symbol and bunding line markings category=`stop` `Stop line` - Solid white lines extending across approach lanes to indicate the point at which the stop is intended or required to be made. `Yield line` - 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` - word markings. `BIKE text` `BUS text` `ONLY text` `SCHOOL text` `STOP text` `YIELD text` `Other text`	`name=transverse crosswalk`	Pavement markings as described in FWHA Manual on Uniform Traffic Control Devices (MUTCD) 11th Edition. Note: Straight arrow detection includes through lane-use arrows, wrong-way arrow and parking lot arrow markings.
`type`	string	Type of roadway element. `pavement_marking` - Pavement markings and colored pavements. `infrastructure` - Structural roadway elements.	`type=pavement_marking`	Pavement markings and roadway features as described in FWHA Manual on Uniform Traffic Control Devices (MUTCD) 11th Edition.
`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` - Acceptable. Minimal visible signs of defects. `4` - Good. No visible signs of defects.	`number=1`
`confidence`	number	AI confidence score. Range between 0 and 1. `0` = lowest confidence. `1` = highest confidence.	`confidence=0.72`	Positive numbers between 0 - 1.
`area`	number	Bounding box area (square meters).	`area=489.95`
`crossing_distance`²	number	Calculated distance. Pedestrian crossing distance (meters).	`crossing_distance=30.6`
`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=©2024 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-ca-losangeles-2023`
`child_aoi`	string	Vexcel data collection child area name.	`child_aoi=us-ca-losangeles-2023`
`min_gsd`	number	Minimum ground sampling distance (meters) of image tile.	`min_gsd=0.0507`
`max_gsd`	number	Maximum ground sampling distance (meters) of image tile.	`max_gsd=0.0765`
`min_capture_date`	date	The start date of image capture for the `child_aoi` (m/d/yyyy h:mm).	`capture_date_min=11/24/2022 20:59`
`max_capture_date`	date	The end date for image capture for the `child_aoi` (m/d/yyyy h:mm).	`capture_date_max=2/02/2023 18:04`
`estimated_date`	date	The collection date of the nadir image most centered over the road element location.	`estimated_date=1/17/2023 21:13`
`process_date`	date	Date imagery analyzed by Vexcel algorithms (m/d/yyyy h:mm).	`process_date=12/01/2023 10:59`
`bbox_wkt`	string	Bounding box geometry in Well-known text (WKT) format.	`bbox_wkt=POLYGON ((-118.13014313578606 34.01474117134329, -118.12982194125652 34.01474117134329, -118.12982194125652 34.01489013153246, -118.13014313578606 34.01489013153246, -118.13014313578606 34.01474117134329))`
`crossing_wkt`²	string	Linestring geometry in Well-known text (WKT) format.	`crossing_wkt=LINESTRING (-118.1301431357860565 34.0148506073785413, -118.1298219412565231 34.0147808407089798)`
¹ Condition scoring based on white and yellow pavement markings. ² Available with crosswalk elements.
Updated 2024-02-08. ©2024 Vexcel Imaging US, Inc.

Elements Roadway: Data Dictionary

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.