File size: 4,375 Bytes
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"categories": {
"stairs": {
"display_name": "Stairs",
"geometry_model": "tread_riser_block",
"primary_users": ["mobility_impairment", "blind_or_low_vision"],
"surface_role": "level_change_barrier",
"risk_metrics": ["step_edge_continuity", "riser_height_consistency", "handrail_or_obstacle_clearance"],
"annotation_priority": ["target_visible", "target_amodal", "hidden", "obstacle", "stair_edges_y"],
"notes": "Use category-specific tread and riser geometry. Do not treat stairs as one smooth ramp."
},
"ramp": {
"display_name": "Accessible Ramp",
"geometry_model": "sloped_prism",
"primary_users": ["wheelchair_user", "walker_user", "mobility_impairment"],
"surface_role": "accessible_level_change",
"risk_metrics": ["slope", "cross_slope", "landing_continuity", "side_edge_clearance"],
"annotation_priority": ["target_visible", "target_amodal", "hidden", "obstacle", "ramp_edges"],
"notes": "Fit a continuous sloped surface and solidify as a ramp prism with side caps."
},
"tactile_paving": {
"display_name": "Tactile Paving",
"geometry_model": "surface_attachment_ribs_or_domes",
"primary_users": ["blind_or_low_vision"],
"surface_role": "navigation_cue",
"risk_metrics": ["pattern_direction", "pattern_periodicity", "warning_surface_coverage", "continuity_under_occlusion"],
"annotation_priority": ["target_visible", "target_amodal", "hidden", "obstacle", "pattern_type"],
"notes": "Reconstruct as shallow raised dots/ribs attached to a walkway or ramp base surface, not as a standalone thick body."
},
"curb_cut": {
"display_name": "Curb Cut",
"geometry_model": "curb_ramp_prism",
"primary_users": ["wheelchair_user", "walker_user", "mobility_impairment"],
"surface_role": "street_sidewalk_transition",
"risk_metrics": ["curb_transition_height", "ramp_slope", "gutter_alignment", "truncated_dome_presence"],
"annotation_priority": ["target_visible", "target_amodal", "hidden", "obstacle", "curb_edges"],
"notes": "Model as a local ramp transition between sidewalk and roadway, often with tactile warning surface."
},
"raised_curb": {
"display_name": "Raised Curb",
"geometry_model": "raised_curb_prism",
"primary_users": ["wheelchair_user", "walker_user", "blind_or_low_vision", "mobility_impairment"],
"surface_role": "non_walkable_level_change_barrier",
"risk_metrics": ["curb_height", "top_edge_continuity", "vertical_face_continuity", "route_clearance"],
"annotation_priority": ["target_visible", "target_amodal", "hidden", "obstacle", "curb_top_edge", "curb_base_edge"],
"notes": "Model as one continuous raised prism with a top surface and vertical face. Never infer repeated stair treads or a sawtooth profile."
},
"walkway": {
"display_name": "Walkway / Flat Ground",
"geometry_model": "flat_or_low_slope_slab",
"primary_users": ["wheelchair_user", "walker_user", "blind_or_low_vision"],
"surface_role": "travel_path",
"risk_metrics": ["surface_continuity", "clear_width", "obstacle_clearance", "roughness"],
"annotation_priority": ["target_visible", "target_amodal", "hidden", "obstacle"],
"notes": "Use a continuous slab or low-slope plane. Keep tactile paving as a separate overlay category when present."
}
},
"user_groups": {
"wheelchair_user": {
"requires": ["ramp", "curb_cut", "walkway"],
"high_risk_categories": ["stairs", "raised_curb", "curb_cut", "ramp"]
},
"walker_user": {
"requires": ["ramp", "curb_cut", "walkway"],
"high_risk_categories": ["stairs", "raised_curb", "walkway"]
},
"blind_or_low_vision": {
"requires": ["tactile_paving", "curb_cut", "stairs", "walkway"],
"high_risk_categories": ["tactile_paving", "stairs", "raised_curb", "curb_cut"]
},
"mobility_impairment": {
"requires": ["ramp", "curb_cut", "walkway", "stairs"],
"high_risk_categories": ["stairs", "raised_curb", "ramp", "curb_cut"]
}
},
"dataset_policy": {
"split_by_category": true,
"split_by_user_group": true,
"allow_multi_label": true,
"gold_for_training": false,
"automatic_category_is_ground_truth": false,
"automatic_mask_is_ground_truth": false
}
}
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