{"schema_version":1,"title":"Representative exposed-deck controls informed by detailed NIST calculated slab figures","scope":"Eight tower/case/floor selections only. Coarse explanatory surface controls, not surveyed damage, mesh extraction, or exact color segmentation.","coordinates":{"units":"feet","rectangle_order":["x0","z0","x1","z1"],"x_positive":"east","z_positive":"south","precision":"Most control edges are rounded to about 5 ft. Values 43.5,67.5,103.6 register to existing reference-model boundaries; decimal places do not imply historical measurement accuracy."},"source":{"report":"NIST NCSTAR 1-2","local_pdf":"/Users/theair/wtc-explainer/sources/NCSTAR1-2.pdf","sha256":"27e0c4e7ac8950ff8e7884d9aab80cc568ab816912d50961fc382da295fd7a55","official_url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101012","interpretation_pages":["184","229"],"figure_pages":{"7-11":187,"7-25":209,"7-41":231,"7-55":254}},"evidence":{"source_result":"calculated impact response","control_geometry":"representative visual interpretation of broad retained red/transition areas","measured":false,"exactly_traced":false,"source_semantics":"NIST sets red fringes at 2% plastic strain, corresponding to severely damaged/failed concrete that may be removed to expose supporting metal deck. Remaining modeled elements retain reduced deck-only strength in the analysis. Elements are eroded at 30% plastic strain, representing deck failure and through-floor holes. Red does not prove intact or load-bearing real decking.","direction_registration":"WTC1 detail figures have the north face at image top and increasing east x to the right (verified from column labels). WTC2 detail figures are rotated: the south face is image left, the east face image bottom; image-right is decreasing z and image-down increasing x. Do not use the north-up transform of the separate summary footprint maps."},"integration":{"surface_controls_independent_of_structural_severe_boxes":true,"reason":"Detailed red concrete-failure regions occur outside summary severe floor-system rectangles; WTC1 base floor95 has no summary severe rectangle despite visible red slab regions.","priority":["original_as_built_voids","existing_summary_removed_openings","representative_exposed_deck_controls","other_retained_slab_and_severe_visualization"],"clip_to_existing_slab_domain":true,"subtract_original_as_built_voids":true,"subtract_existing_removed_rectangles":true,"new_through_floor_holes_defined_here":false,"do_not_refill_removed_openings":true,"do_not_extend_to_other_floors":true,"displacement":"No sag magnitude, tear shape, corrugation damage, or fragment placement is measured by these maps. Apply the separately labeled reconstruction displacement field consistently to concrete and deck.","appearance":"Potential concrete loss exposes continuous/deformed nominal decking where retained geometry exists. Nearby concrete fragments and exposed-deck continuity remain representative, not a computed residual load path."},"wtc1":{"base":{"95":{"exposedDeck":[[-20,-80,-15,-45],[20,-70,30,-45],[10,-40,30,-20]],"source":{"citation":"NIST NCSTAR 1-2, Fig. 7-11, p. 187, Case A, floor 95","figure":"7-11","printed_page":187,"case":"A","source_kind":"simulation result","source_page_png":"/Users/theair/wtc-explainer/analysis/report-evidence/NIST1-2_p187_Fig7-11_slab.png","native_figure_image":"/Users/theair/wtc-explainer/analysis/report-evidence/NIST1-2_slab_wtc1_base_f95.png","url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101012"},"note":"Coarse masks select representative portions of the calculated retained red/transition regions. Concrete may be lost while the modeled deck remains. Existing opening masks and original building voids always take precedence. These masks neither confirm real deck survival nor locate individual fractures.","evidence_category":"inferred_surface_controls_from_calculated_figure","measured":false,"traced":false,"boundary_precision":"Representative, generally rounded to about 5 ft; not a numerical extraction of strain contours.","regions":[{"id":"WTC1-A-F95-exposed-deck-01","rect":[-20,-80,-15,-45],"placement_note":"Narrow retained western shoulder beside the fuselage opening."},{"id":"WTC1-A-F95-exposed-deck-02","rect":[20,-70,30,-45],"placement_note":"Eastern shoulder of the north tenant-floor damage."},{"id":"WTC1-A-F95-exposed-deck-03","rect":[10,-40,30,-20],"placement_note":"Retained red slab region on the east side of the damaged north core."}],"opening_policy":"Use existing case-specific removed rectangles from damage_zones.json; no new hole boundaries are defined by this control file.","qa":{"mask_area_after_existing_removed_sq_ft":683.0,"area_limit":"Display-control coverage before clipping to original slab domain/shafts; not a historical damaged-area estimate."}},"96":{"exposedDeck":[[-60,-103.6,-40,-98],[5,-100,15,-40],[-50,-42,-35,-25],[0,-35,15,-20]],"source":{"citation":"NIST NCSTAR 1-2, Fig. 7-11, p. 187, Case A, floor 96","figure":"7-11","printed_page":187,"case":"A","source_kind":"simulation result","source_page_png":"/Users/theair/wtc-explainer/analysis/report-evidence/NIST1-2_p187_Fig7-11_slab.png","native_figure_image":"/Users/theair/wtc-explainer/analysis/report-evidence/NIST1-2_slab_wtc1_base_f96.png","url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101012"},"note":"Coarse masks select representative portions of the calculated retained red/transition regions. Concrete may be lost while the modeled deck remains. Existing opening masks and original building voids always take precedence. These masks neither confirm real deck survival nor locate individual fractures.","evidence_category":"inferred_surface_controls_from_calculated_figure","measured":false,"traced":false,"boundary_precision":"Representative, generally rounded to about 5 ft; not a numerical extraction of strain contours.","regions":[{"id":"WTC1-A-F96-exposed-deck-01","rect":[-60,-103.6,-40,-98],"placement_note":"Shallow failed-concrete fringe at the north perimeter."},{"id":"WTC1-A-F96-exposed-deck-02","rect":[5,-100,15,-40],"placement_note":"Eastern edge of the north impact opening."},{"id":"WTC1-A-F96-exposed-deck-03","rect":[-50,-42,-35,-25],"placement_note":"Western shoulder of damaged slab at the north core edge."},{"id":"WTC1-A-F96-exposed-deck-04","rect":[0,-35,15,-20],"placement_note":"Retained red material near the east edge of the core opening."}],"opening_policy":"Use existing case-specific removed rectangles from damage_zones.json; no new hole boundaries are defined by this control file.","qa":{"mask_area_after_existing_removed_sq_ft":1019.4,"area_limit":"Display-control coverage before clipping to original slab domain/shafts; not a historical damaged-area estimate."}}},"severe":{"95":{"exposedDeck":[[-25,-100,-15,-45],[20,-95,35,-45],[5,-40,30,-25],[-25,-25,0,-5]],"source":{"citation":"NIST NCSTAR 1-2, Fig. 7-25, p. 209, Case B, floor 95","figure":"7-25","printed_page":209,"case":"B","source_kind":"simulation result","source_page_png":"/Users/theair/wtc-explainer/analysis/report-evidence/NIST1-2_p209_Fig7-25_slab.png","native_figure_image":"/Users/theair/wtc-explainer/analysis/report-evidence/NIST1-2_slab_wtc1_severe_f95.png","url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101012"},"note":"Coarse masks select representative portions of the calculated retained red/transition regions. Concrete may be lost while the modeled deck remains. Existing opening masks and original building voids always take precedence. These masks neither confirm real deck survival nor locate individual fractures.","evidence_category":"inferred_surface_controls_from_calculated_figure","measured":false,"traced":false,"boundary_precision":"Representative, generally rounded to about 5 ft; not a numerical extraction of strain contours.","regions":[{"id":"WTC1-B-F95-exposed-deck-01","rect":[-25,-100,-15,-45],"placement_note":"Broader western shoulder of the damaged north tenant slab."},{"id":"WTC1-B-F95-exposed-deck-02","rect":[20,-95,35,-45],"placement_note":"Eastern shoulder beside the through-floor opening."},{"id":"WTC1-B-F95-exposed-deck-03","rect":[5,-40,30,-25],"placement_note":"Retained red core slab island east of the opening."},{"id":"WTC1-B-F95-exposed-deck-04","rect":[-25,-25,0,-5],"placement_note":"Lower western fringe of the core damage."}],"opening_policy":"Use existing case-specific removed rectangles from damage_zones.json; no new hole boundaries are defined by this control file.","qa":{"mask_area_after_existing_removed_sq_ft":1900.5,"area_limit":"Display-control coverage before clipping to original slab domain/shafts; not a historical damaged-area estimate."}},"96":{"exposedDeck":[[-55,-103.6,-35,-98],[5,-100,15,-40],[-50,-43.5,-35,-20],[5,-20,15,10]],"source":{"citation":"NIST NCSTAR 1-2, Fig. 7-25, p. 209, Case B, floor 96","figure":"7-25","printed_page":209,"case":"B","source_kind":"simulation result","source_page_png":"/Users/theair/wtc-explainer/analysis/report-evidence/NIST1-2_p209_Fig7-25_slab.png","native_figure_image":"/Users/theair/wtc-explainer/analysis/report-evidence/NIST1-2_slab_wtc1_severe_f96.png","url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101012"},"note":"Coarse masks select representative portions of the calculated retained red/transition regions. Concrete may be lost while the modeled deck remains. Existing opening masks and original building voids always take precedence. These masks neither confirm real deck survival nor locate individual fractures.","evidence_category":"inferred_surface_controls_from_calculated_figure","measured":false,"traced":false,"boundary_precision":"Representative, generally rounded to about 5 ft; not a numerical extraction of strain contours.","regions":[{"id":"WTC1-B-F96-exposed-deck-01","rect":[-55,-103.6,-35,-98],"placement_note":"North perimeter concrete-failure fringe."},{"id":"WTC1-B-F96-exposed-deck-02","rect":[5,-100,15,-40],"placement_note":"Eastern strip alongside the long north opening."},{"id":"WTC1-B-F96-exposed-deck-03","rect":[-50,-43.5,-35,-20],"placement_note":"Western shoulder in the north core slab."},{"id":"WTC1-B-F96-exposed-deck-04","rect":[5,-20,15,10],"placement_note":"Narrow damaged core corridor south of the principal opening."}],"opening_policy":"Use existing case-specific removed rectangles from damage_zones.json; no new hole boundaries are defined by this control file.","qa":{"mask_area_after_existing_removed_sq_ft":1224.4,"area_limit":"Display-control coverage before clipping to original slab domain/shafts; not a historical damaged-area estimate."}}}},"wtc2":{"base":{"80":{"exposedDeck":[[0,93,12,103.6],[25,70,35,103.6],[25,35,40,65],[35,0,43.5,25]],"source":{"citation":"NIST NCSTAR 1-2, Fig. 7-41, p. 231, Case C, floor 80","figure":"7-41","printed_page":231,"case":"C","source_kind":"simulation result","source_page_png":"/Users/theair/wtc-explainer/analysis/report-evidence/NIST1-2_p231_Fig7-41_slab.png","native_figure_image":"/Users/theair/wtc-explainer/analysis/report-evidence/NIST1-2_slab_wtc2_base_f80.png","url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101012"},"note":"Coarse masks select representative portions of the calculated retained red/transition regions. Concrete may be lost while the modeled deck remains. Existing opening masks and original building voids always take precedence. These masks neither confirm real deck survival nor locate individual fractures.","evidence_category":"inferred_surface_controls_from_calculated_figure","measured":false,"traced":false,"boundary_precision":"Representative, generally rounded to about 5 ft; not a numerical extraction of strain contours.","regions":[{"id":"WTC2-C-F80-exposed-deck-01","rect":[0,93,12,103.6],"placement_note":"Retained concrete-failure fringe above the south-face entry notch."},{"id":"WTC2-C-F80-exposed-deck-02","rect":[25,70,35,103.6],"placement_note":"South tenant-floor red strip south/east of the notch."},{"id":"WTC2-C-F80-exposed-deck-03","rect":[25,35,40,65],"placement_note":"Red retained region near the southeast core corner."},{"id":"WTC2-C-F80-exposed-deck-04","rect":[35,0,43.5,25],"placement_note":"Narrow red material along the east core edge."}],"opening_policy":"Use existing case-specific removed rectangles from damage_zones.json; no new hole boundaries are defined by this control file.","qa":{"mask_area_after_existing_removed_sq_ft":1024.4,"area_limit":"Display-control coverage before clipping to original slab domain/shafts; not a historical damaged-area estimate."}},"81":{"exposedDeck":[[25,45,43.5,65],[47,85,80,103.6],[45,40,65,85],[50,5,70,40]],"source":{"citation":"NIST NCSTAR 1-2, Fig. 7-41, p. 231, Case C, floor 81","figure":"7-41","printed_page":231,"case":"C","source_kind":"simulation result","source_page_png":"/Users/theair/wtc-explainer/analysis/report-evidence/NIST1-2_p231_Fig7-41_slab.png","native_figure_image":"/Users/theair/wtc-explainer/analysis/report-evidence/NIST1-2_slab_wtc2_base_f81.png","url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101012"},"note":"Coarse masks select representative portions of the calculated retained red/transition regions. Concrete may be lost while the modeled deck remains. Existing opening masks and original building voids always take precedence. These masks neither confirm real deck survival nor locate individual fractures.","evidence_category":"inferred_surface_controls_from_calculated_figure","measured":false,"traced":false,"boundary_precision":"Representative, generally rounded to about 5 ft; not a numerical extraction of strain contours.","regions":[{"id":"WTC2-C-F81-exposed-deck-01","rect":[25,45,43.5,65],"placement_note":"Core-side shoulder of the southeast impact path."},{"id":"WTC2-C-F81-exposed-deck-02","rect":[47,85,80,103.6],"placement_note":"Red decking-bearing elements along the south end of the east tenant floor."},{"id":"WTC2-C-F81-exposed-deck-03","rect":[45,40,65,85],"placement_note":"Red/transition patches in the east tenant-floor strip adjacent to the opening."},{"id":"WTC2-C-F81-exposed-deck-04","rect":[50,5,70,40],"placement_note":"Further red patches extending northward along the east tenant floor."}],"opening_policy":"Use existing case-specific removed rectangles from damage_zones.json; no new hole boundaries are defined by this control file.","qa":{"mask_area_after_existing_removed_sq_ft":2515.5,"area_limit":"Display-control coverage before clipping to original slab domain/shafts; not a historical damaged-area estimate."}}},"severe":{"80":{"exposedDeck":[[-10,85,0,103.6],[18,70,35,103.6],[0,40,20,65],[25,25,40,65],[35,0,45,20]],"source":{"citation":"NIST NCSTAR 1-2, Fig. 7-55, p. 254, Case D, floor 80","figure":"7-55","printed_page":254,"case":"D","source_kind":"simulation result","source_page_png":"/Users/theair/wtc-explainer/analysis/report-evidence/NIST1-2_p254_Fig7-55_slab.png","native_figure_image":"/Users/theair/wtc-explainer/analysis/report-evidence/NIST1-2_slab_wtc2_severe_f80.jpeg","url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101012"},"note":"Coarse masks select representative portions of the calculated retained red/transition regions. Concrete may be lost while the modeled deck remains. Existing opening masks and original building voids always take precedence. These masks neither confirm real deck survival nor locate individual fractures.","evidence_category":"inferred_surface_controls_from_calculated_figure","measured":false,"traced":false,"boundary_precision":"Representative, generally rounded to about 5 ft; not a numerical extraction of strain contours.","regions":[{"id":"WTC2-D-F80-exposed-deck-01","rect":[-10,85,0,103.6],"placement_note":"South-face concrete-loss fringe on the lower-x side of the notch."},{"id":"WTC2-D-F80-exposed-deck-02","rect":[18,70,35,103.6],"placement_note":"Retained south tenant strip on the higher-x side of the notch."},{"id":"WTC2-D-F80-exposed-deck-03","rect":[0,40,20,65],"placement_note":"Red bands extending into the south core area."},{"id":"WTC2-D-F80-exposed-deck-04","rect":[25,25,40,65],"placement_note":"Retained red southeast-core shoulder; existing holes remove its central portion."},{"id":"WTC2-D-F80-exposed-deck-05","rect":[35,0,45,20],"placement_note":"East core-edge concrete-loss fringe."}],"opening_policy":"Use existing case-specific removed rectangles from damage_zones.json; no new hole boundaries are defined by this control file.","qa":{"mask_area_after_existing_removed_sq_ft":1646.3,"area_limit":"Display-control coverage before clipping to original slab domain/shafts; not a historical damaged-area estimate."}},"81":{"exposedDeck":[[15,70,25,100],[47,85,70,103.6],[47,40,65,85],[50,5,65,40]],"source":{"citation":"NIST NCSTAR 1-2, Fig. 7-55, p. 254, Case D, floor 81","figure":"7-55","printed_page":254,"case":"D","source_kind":"simulation result","source_page_png":"/Users/theair/wtc-explainer/analysis/report-evidence/NIST1-2_p254_Fig7-55_slab.png","native_figure_image":"/Users/theair/wtc-explainer/analysis/report-evidence/NIST1-2_slab_wtc2_severe_f81.jpeg","url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101012"},"note":"Coarse masks select representative portions of the calculated retained red/transition regions. Concrete may be lost while the modeled deck remains. Existing opening masks and original building voids always take precedence. These masks neither confirm real deck survival nor locate individual fractures.","evidence_category":"inferred_surface_controls_from_calculated_figure","measured":false,"traced":false,"boundary_precision":"Representative, generally rounded to about 5 ft; not a numerical extraction of strain contours.","regions":[{"id":"WTC2-D-F81-exposed-deck-01","rect":[15,70,25,100],"placement_note":"Narrow south-tenant/core shoulder; most overlap is intentionally removed by opening precedence."},{"id":"WTC2-D-F81-exposed-deck-02","rect":[47,85,70,103.6],"placement_note":"Retained red elements near the southeast perimeter corner."},{"id":"WTC2-D-F81-exposed-deck-03","rect":[47,40,65,85],"placement_note":"Red/transition patches in the east tenant floor beside the enlarged opening."},{"id":"WTC2-D-F81-exposed-deck-04","rect":[50,5,65,40],"placement_note":"Red patches extending farther north within the east tenant-floor strip."}],"opening_policy":"Use existing case-specific removed rectangles from damage_zones.json; no new hole boundaries are defined by this control file.","qa":{"mask_area_after_existing_removed_sq_ft":1813.8,"area_limit":"Display-control coverage before clipping to original slab domain/shafts; not a historical damaged-area estimate."}}}}}