{"schema_version":1,"units":"feet","coordinate_system":{"x":"east","y":"up; displacements negative downward","z":"south","retainedRuns_points_y":"top-chord elevation relative to this floor slab top, including -4/12 ft reference offset; add floor placement once","retainedBeamRuns_points_y":"top-flange upper reference = -4/12 ft plus representative vertical drop; floor placement is added once"},"scope":"Representative reconstruction of selected NIST calculated impact states. Published raster figures constrain projected paths; these are not NIST nodal outputs, measured fracture coordinates, or confirmed historical individual trusses.","field_policy":{"kernel":"For each control use compact support r<radius; smooth falloff w=(1-(r/radius)^2)^2 or equivalent. Outside all radii displacement is exactly zero.","blend":"Normalize overlapping controls without dividing away the falloff; e.g. sum(w*d)/max(1,sum(w)). Pure sum(w*d)/sum(w) would retain full displacement at an isolated radius boundary.","application":"Use original plan coordinates for footprint classification, then warp only retained geometry; all connected chord/web/seat vertices share the same mapping.","retained_run_override":"Explicit source-visible connected runs may override coarse rectangular omissions. Replace the affected modeled lane segment where identified; do not add duplicate intact framing. These are calculated-source reconstruction objects with representative vertical geometry."},"assumptions":["Horizontal controls are calibrated, hand-fitted representative displacements near retained damage edges; not a pixel-perfect member-node digitization.","Plan anchors use named columns and project nominal facade/core reference lines. Inspection pixel positions are reproducible approximate manual selections, with several-pixel uncertainty.","Front views show overlapping projections and cannot uniquely assign every plan lane a vertical coordinate. All dy and retained-run y values are illustrative, chosen below or comparable to the visible local one-story sag envelope.","Do not scale the base case monotonically into the more severe case; the report shows different trajectories and retained shapes.","No inferred central floating debris; only connected source-visible retained lanes are included.","As-built state and floors absent from this dataset have no deformation."],"wtc1":{"base":{"95":{"controls":[{"x":-20,"z":-65,"dx":-2.5,"dy":-6.5,"dz":1.5,"radius":25},{"x":26.7,"z":-65,"dx":-2,"dy":-4.5,"dz":1.5,"radius":23},{"x":-13.3,"z":-46,"dx":-2,"dy":-7.5,"dz":2.5,"radius":21}],"retainedRuns":[{"id":"WTC1-F95-base-left-bent-lane","points":[[-3.518,-0.333,-95.412],[-4.455,-2.333,-79.55],[-6.328,-5.333,-60.564],[-7.03,-7.333,-43.5]],"sourceColumn":129,"pair":true,"depthFt":2.4166666666666665,"source_pixels_with_illustrative_drop":[[653,264,0],[649,330,-2],[641,409,-5],[638,480,-7]],"note":"Left retained bent lane beside the opening; lane registration is near column129. Polyline follows a visible retained lane in the calculated plan view; point correspondence, pair centerline, and y drop are representative. No floating debris is inferred."},{"id":"WTC1-F95-base-right-folded-lane","points":[[8.423,-0.333,-97.094],[8.189,-1.833,-78.348],[11.935,-3.333,-72.58],[11.701,-7.333,-44.221]],"sourceColumn":133,"pair":true,"depthFt":2.4166666666666665,"source_pixels_with_illustrative_drop":[[704,257,0],[703,335,-1.5],[719,359,-3],[718,477,-7]],"note":"Right folded lane visible between the two broader retained floor sections. Polyline follows a visible retained lane in the calculated plan view; point correspondence, pair centerline, and y drop are representative. No floating debris is inferred."}],"source":{"citation":"NIST NCSTAR 1-2, Fig. 7-10, p. 186; front view Fig. 7-9, p. 185","url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101012","plan_image":"analysis/damage_figs/fig7-10_trusses_WTC1_95_96.png","plan_image_size_px":[1700,2200],"front_pdf_printed_page":185,"case":"A"},"image_anchors":{"inspection_size_px":[1376,1780],"horizontal":{"pixel_axis":"u","anchors":[{"pixel":426,"column":113,"x_ft":-56.666666666666664},{"pixel":967,"column":151,"x_ft":70.0}]},"depth":{"pixel_axis":"v","anchors":[{"pixel":230,"z_ft":-103.58333333333333,"feature":"unaffected north ends / facade reference registration"},{"pixel":480,"z_ft":-43.5,"feature":"unaffected core-side ends / core reference registration"}]},"note":"Columns register x from 40-inch spacing. z span is registered to the project facade/core references; the image is not a dimensioned node export."},"note":"The smooth displacement field follows the local direction and scale of visible calculated distortion. Vertical drops and interpolation are representative; explicit retained runs recover selected connected remnants omitted by summary rectangles."},"96":{"controls":[{"x":-43.3,"z":-63,"dx":4.5,"dy":-5.5,"dz":2,"radius":26},{"x":-36.7,"z":-47,"dx":6,"dy":-7,"dz":3.5,"radius":26},{"x":10,"z":-61,"dx":1,"dy":-2.5,"dz":1.5,"radius":20}],"retainedRuns":[{"id":"WTC1-F96-base-left-dangling-strip","points":[[-23.498,-1.333,-91.662],[-21.399,-3.833,-72.826],[-17.202,-7.333,-54.229],[-20.0,-9.333,-41.116]],"sourceColumn":123,"pair":true,"depthFt":2.4166666666666665,"source_pixels_with_illustrative_drop":[[672,664,-1],[681,743,-3.5],[699,821,-7],[687,876,-9]],"note":"A conspicuous source-visible retained strip bends east and hangs into the mapped opening; the coarse summary box omits this fragment. Polyline follows a visible retained lane in the calculated plan view; point correspondence, pair centerline, and y drop are representative. No floating debris is inferred."}],"source":{"citation":"NIST NCSTAR 1-2, Fig. 7-10, p. 186; front view Fig. 7-9, p. 185","url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101012","plan_image":"analysis/damage_figs/fig7-10_trusses_WTC1_95_96.png","plan_image_size_px":[1700,2200],"front_pdf_printed_page":185,"case":"A"},"image_anchors":{"inspection_size_px":[1376,1780],"horizontal":{"pixel_axis":"u","anchors":[{"pixel":444,"column":107,"x_ft":-76.66666666666667},{"pixel":930,"column":141,"x_ft":36.666666666666664}]},"depth":{"pixel_axis":"v","anchors":[{"pixel":614,"z_ft":-103.58333333333333,"feature":"unaffected north ends / facade reference registration"},{"pixel":866,"z_ft":-43.5,"feature":"unaffected core-side ends / core reference registration"}]},"note":"Columns register x from 40-inch spacing. z span is registered to the project facade/core references; the image is not a dimensioned node export."},"note":"The smooth displacement field follows the local direction and scale of visible calculated distortion. Vertical drops and interpolation are representative; explicit retained runs recover selected connected remnants omitted by summary rectangles."},"94":{"controls":[{"x":0,"z":-74,"dx":0,"dy":-3.5,"dz":0,"radius":45},{"x":33.3,"z":-74,"dx":0,"dy":-3,"dz":0,"radius":36}],"retainedRuns":[],"source":{"citation":"NIST NCSTAR 1-2B, Fig. 9-15, p. 217; front view Fig. 9-14, p. 216","url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101015","plan_image":"analysis/additional-interior-floors/p33-image0-Im51.png","plan_image_size_px":[830,433],"front_pdf_printed_page":216,"case":"A","figureAssets":["NIST1-2B_p217_Fig9-15_WTC1_F94_base_plan.png","NIST1-2B_p216_Fig9-14_WTC1_base_front.jpg"],"measurementStatus":"Calculated source views constrain framing location, topology and visible distortion. Controls, interpolation and all y displacements are representative; these are not extracted solver nodes."},"image_anchors":{"inspection_size_px":[830,433],"horizontal":{"pixel_axis":"u","anchors":[{"pixel":44,"column":115,"x_ft":-50},{"pixel":788,"column":157,"x_ft":90}]},"depth":{"pixel_axis":"v","anchors":[{"pixel":105,"z_ft":-103.583333333,"feature":"north facade reference"},{"pixel":410,"z_ft":-43.5,"feature":"core north edge"}]},"manual_uncertainty_px":3,"note":"Down-image is +z (south), right-image is +x (east). Nominal support reference lines approximate this calculated projected view; almost straight plan lanes do not establish their vertical coordinates."},"note":"The floor 94 north plan remains largely straight; Fig. 9-14 and text on p. 211 identify downward sag on floors 94-96. Only a representative vertical field is added. Local small plan kinks are too ambiguous to turn into measured offsets or restored member identities.","control_attribution":{"horizontal":"Hand-fitted direction and spatial support near visible plan distortion; zero where the image does not clearly require a lateral displacement.","vertical":"Representative downward interpolation, not a measured maximum or a unique assignment of front-view lines to plan lanes.","footprint":"Preserve the existing original-coordinate cuts and slab openings; only explicitly identified retainedBeamRuns override a coarse member omission."}}},"severe":{"95":{"controls":[{"x":-20,"z":-65,"dx":-2,"dy":-5.5,"dz":1,"radius":24},{"x":23.3,"z":-64,"dx":-1.5,"dy":-4,"dz":1.5,"radius":23},{"x":-13.3,"z":-46,"dx":-2.5,"dy":-7,"dz":2,"radius":21}],"retainedRuns":[{"id":"WTC1-F95-severe-left-bent-lane","points":[[-3.518,-0.333,-101.637],[-4.455,-1.833,-76.339],[-5.157,-4.333,-60.771],[-7.264,-6.833,-43.743]],"sourceColumn":129,"pair":true,"depthFt":2.4166666666666665,"source_pixels_with_illustrative_drop":[[644,249,0],[640,353,-1.5],[637,417,-4],[628,487,-6.5]],"note":"Calculated left lane bends west toward the core end; Case B is not a uniform enlargement of Case A. Polyline follows a visible retained lane in the calculated plan view; point correspondence, pair centerline, and y drop are representative. No floating debris is inferred."},{"id":"WTC1-F95-severe-right-folded-lane","points":[[8.657,-0.333,-100.664],[8.891,-1.833,-78.285],[10.53,-4.333,-61.744],[12.169,-6.833,-43.743]],"sourceColumn":133,"pair":true,"depthFt":2.4166666666666665,"source_pixels_with_illustrative_drop":[[696,253,0],[697,345,-1.5],[704,413,-4],[711,487,-6.5]],"note":"Right retained lane folds toward the east near the core end. Polyline follows a visible retained lane in the calculated plan view; point correspondence, pair centerline, and y drop are representative. No floating debris is inferred."}],"source":{"citation":"NIST NCSTAR 1-2, Fig. 7-24, p. 208; front view Fig. 7-23, p. 207","url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101012","plan_image":"analysis/damage_figs/fig7-24_trusses_WTC1_95_96_severe.png","plan_image_size_px":[1700,2200],"front_pdf_printed_page":207,"case":"B"},"image_anchors":{"inspection_size_px":[1376,1780],"horizontal":{"pixel_axis":"u","anchors":[{"pixel":417,"column":113,"x_ft":-56.666666666666664},{"pixel":958,"column":151,"x_ft":70.0}]},"depth":{"pixel_axis":"v","anchors":[{"pixel":241,"z_ft":-103.58333333333333,"feature":"unaffected north ends / facade reference registration"},{"pixel":488,"z_ft":-43.5,"feature":"unaffected core-side ends / core reference registration"}]},"note":"Columns register x from 40-inch spacing. z span is registered to the project facade/core references; the image is not a dimensioned node export."},"note":"The smooth displacement field follows the local direction and scale of visible calculated distortion. Vertical drops and interpolation are representative; explicit retained runs recover selected connected remnants omitted by summary rectangles."},"96":{"controls":[{"x":-40,"z":-61,"dx":5.5,"dy":-6,"dz":2.5,"radius":26},{"x":-33.3,"z":-43,"dx":8.5,"dy":-8,"dz":6,"radius":29},{"x":10,"z":-55,"dx":1.5,"dy":-3.5,"dz":2.5,"radius":22}],"retainedRuns":[{"id":"WTC1-F96-severe-left-dangling-strip","points":[[-21.745,-1.833,-86.624],[-17.324,-4.333,-74.268],[-13.135,-6.333,-59.005],[-9.179,-8.333,-48.345],[-6.619,-10.333,-34.778]],"sourceColumn":123,"pair":true,"depthFt":2.4166666666666665,"source_pixels_with_illustrative_drop":[[681,704,-1.5],[700,755,-4],[718,818,-6],[735,862,-8],[746,918,-10]],"note":"Long retained strip visibly curls east beyond the former core-side edge; restored as a calculated-source remnant, overriding the coarser omitted rectangle. Polyline follows a visible retained lane in the calculated plan view; point correspondence, pair centerline, and y drop are representative. No floating debris is inferred."}],"source":{"citation":"NIST NCSTAR 1-2, Fig. 7-24, p. 208; front view Fig. 7-23, p. 207","url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101012","plan_image":"analysis/damage_figs/fig7-24_trusses_WTC1_95_96_severe.png","plan_image_size_px":[1700,2200],"front_pdf_printed_page":207,"case":"B"},"image_anchors":{"inspection_size_px":[1376,1780],"horizontal":{"pixel_axis":"u","anchors":[{"pixel":445,"column":107,"x_ft":-76.66666666666667},{"pixel":932,"column":141,"x_ft":36.666666666666664}]},"depth":{"pixel_axis":"v","anchors":[{"pixel":634,"z_ft":-103.58333333333333,"feature":"unaffected north ends / facade reference registration"},{"pixel":882,"z_ft":-43.5,"feature":"unaffected core-side ends / core reference registration"}]},"note":"Columns register x from 40-inch spacing. z span is registered to the project facade/core references; the image is not a dimensioned node export."},"note":"The smooth displacement field follows the local direction and scale of visible calculated distortion. Vertical drops and interpolation are representative; explicit retained runs recover selected connected remnants omitted by summary rectangles."},"94":{"controls":[{"x":6.7,"z":-74,"dx":0,"dy":-3,"dz":0,"radius":45},{"x":33.3,"z":-74,"dx":0,"dy":-2.5,"dz":0,"radius":36}],"retainedRuns":[],"source":{"citation":"NIST NCSTAR 1-2B, Fig. 9-55, p. 270; front view Fig. 9-54, p. 269","url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101015","plan_image":"analysis/additional-interior-floors/p86-image0-Im190.png","plan_image_size_px":[805,426],"front_pdf_printed_page":269,"case":"B","figureAssets":["NIST1-2B_p270_Fig9-55_WTC1_F94_severe_plan.png","NIST1-2B_p269_Fig9-54_WTC1_severe_front.png"],"measurementStatus":"Calculated source views constrain framing location, topology and visible distortion. Controls, interpolation and all y displacements are representative; these are not extracted solver nodes."},"image_anchors":{"inspection_size_px":[805,426],"horizontal":{"pixel_axis":"u","anchors":[{"pixel":28,"column":115,"x_ft":-50},{"pixel":767,"column":157,"x_ft":90}]},"depth":{"pixel_axis":"v","anchors":[{"pixel":105,"z_ft":-103.583333333,"feature":"north facade reference"},{"pixel":410,"z_ft":-43.5,"feature":"core north edge"}]},"manual_uncertainty_px":3,"note":"Down-image is +z (south), right-image is +x (east). Nominal support reference lines approximate this calculated projected view; almost straight plan lanes do not establish their vertical coordinates."},"note":"Floor 94 is retained and nearly straight in plan, while the front view shows downward deformation. The report states WTC 1 more-severe truss damage is slightly less than base because the aircraft trajectory differs (p. 268). This independently bounded representative vertical field is not a monotonic scaling of another floor or case.","control_attribution":{"horizontal":"Hand-fitted direction and spatial support near visible plan distortion; zero where the image does not clearly require a lateral displacement.","vertical":"Representative downward interpolation, not a measured maximum or a unique assignment of front-view lines to plan lanes.","footprint":"Preserve the existing original-coordinate cuts and slab openings; only explicitly identified retainedBeamRuns override a coarse member omission."}}}},"wtc2":{"base":{"80":{"controls":[{"x":6.7,"z":94,"dx":2,"dy":-2.5,"dz":-2.5,"radius":18},{"x":26.7,"z":92,"dx":-1.5,"dy":-3,"dz":-1.5,"radius":19},{"x":20,"z":77,"dx":1,"dy":-1.5,"dz":-1,"radius":17}],"retainedRuns":[{"id":"WTC2-F80-base-west-opening-lip","points":[[10.747,-1.333,102.869],[11.44,-2.133,88.578],[16.987,-2.833,77.503],[16.987,-2.333,68.215]],"sourceColumn":427,"pair":true,"depthFt":2.4166666666666665,"source_pixels_with_illustrative_drop":[[664,348,-1],[704,350,-1.8],[735,366,-2.5],[761,366,-2]],"note":"A connected source-visible lip just above the gap bends in the rotated plan; approximate column427 lane. Polyline follows a visible retained lane in the calculated plan view; point correspondence, pair centerline, and y drop are representative. No floating debris is inferred."}],"source":{"citation":"NIST NCSTAR 1-2, Fig. 7-40, p. 230; front view Fig. 7-39, p. 229","url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101012","plan_image":"analysis/damage_figs/fig7-40_trusses_WTC2_80_81.png","plan_image_size_px":[1700,2200],"front_pdf_printed_page":229,"case":"C"},"image_anchors":{"inspection_size_px":[1376,1780],"horizontal":{"pixel_axis":"v","anchors":[{"pixel":192,"column":443,"x_ft":-43.333333333333336},{"pixel":442,"column":417,"x_ft":43.333333333333336}]},"depth":{"pixel_axis":"u","anchors":[{"pixel":662,"z_ft":103.583333,"feature":"south end or labeled east-face column anchor"},{"pixel":763,"z_ft":67.5,"feature":"core end or labeled east-face column anchor"}]},"note":"Figure is rotated: down-image is world east (+x); right-image is world north (-z). Column443/417 or443/402 register x. East-face columns359/301 register z on floor81."},"note":"The smooth displacement field follows the local direction and scale of visible calculated distortion. Vertical drops and interpolation are representative; explicit retained runs recover selected connected remnants omitted by summary rectangles."},"81":{"controls":[{"x":13.3,"z":86,"dx":1.5,"dy":-4.5,"dz":-2,"radius":21},{"x":50,"z":80,"dx":2.5,"dy":-7.5,"dz":-4.5,"radius":27},{"x":63.3,"z":88,"dx":1.5,"dy":-4,"dz":-2.5,"radius":22},{"x":50,"z":53,"dx":1.5,"dy":-3.5,"dz":-2,"radius":21}],"retainedRuns":[{"id":"WTC2-F81-base-east-core-edge-run","points":[[43.165,-6.333,57.098],[51.122,-4.333,62.998],[69.806,-1.833,63.345],[100.599,-0.333,62.998]],"sourceColumn":349,"pair":true,"depthFt":2.4166666666666665,"source_pixels_with_illustrative_drop":[[582,809,-6],[565,832,-4],[564,886,-1.5],[565,975,0]],"note":"Connected primary lane on the east-floor leading edge; its short broken core-side end is distinct from detached debris above it. Polyline follows a visible retained lane in the calculated plan view; point correspondence, pair centerline, and y drop are representative. No floating debris is inferred."}],"source":{"citation":"NIST NCSTAR 1-2, Fig. 7-40, p. 230; front view Fig. 7-39, p. 229","url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101012","plan_image":"analysis/damage_figs/fig7-40_trusses_WTC2_80_81.png","plan_image_size_px":[1700,2200],"front_pdf_printed_page":229,"case":"C"},"image_anchors":{"inspection_size_px":[1376,1780],"horizontal":{"pixel_axis":"v","anchors":[{"pixel":559,"column":443,"x_ft":-43.333333333333336},{"pixel":954,"column":402,"x_ft":93.33333333333333}]},"depth":{"pixel_axis":"u","anchors":[{"pixel":468,"z_ft":96.666667,"feature":"south end or labeled east-face column anchor"},{"pixel":1025,"z_ft":-96.666667,"feature":"core end or labeled east-face column anchor"}]},"note":"Figure is rotated: down-image is world east (+x); right-image is world north (-z). Column443/417 or443/402 register x. East-face columns359/301 register z on floor81."},"note":"The smooth displacement field follows the local direction and scale of visible calculated distortion. Vertical drops and interpolation are representative; explicit retained runs recover selected connected remnants omitted by summary rectangles."},"79":{"controls":[{"x":5,"z":89,"dx":0,"dy":-4,"dz":-1.5,"radius":22}],"retainedRuns":[],"source":{"citation":"NIST NCSTAR 1-2B, Fig. 9-36, p. 244; front view Fig. 9-35, p. 243","url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101015","plan_image":"analysis/additional-interior-floors/p60-image0-Im118.jpg","plan_image_size_px":[317,393],"front_pdf_printed_page":243,"case":"C","figureAssets":["NIST1-2B_p244_Fig9-36_WTC2_F79_base_plan.jpg","NIST1-2B_p243_Fig9-35_WTC2_base_front.jpg"],"measurementStatus":"Calculated source views constrain framing location, topology and visible distortion. Controls, interpolation and all y displacements are representative; these are not extracted solver nodes."},"image_anchors":{"inspection_size_px":[317,393],"horizontal":{"pixel_axis":"v","anchors":[{"pixel":42,"column":443,"x_ft":-43.333333333},{"pixel":345,"column":417,"x_ft":43.333333333}]},"depth":{"pixel_axis":"u","anchors":[{"pixel":162,"z_ft":103.583333333,"feature":"nominal south facade reference"},{"pixel":286,"z_ft":67.5,"feature":"south core edge"}]},"manual_uncertainty_px":3,"note":"Down-image is +x (east); right-image is -z (north). Row registration to named columns is approximate; connection fixity and member section shapes are not identified by this impact plan."},"note":"A local inward disruption appears at the south edge. Text and front view on p. 243 identify floor 79 sag; the assigned sag and smooth lateral field are representative. Floor 79 uses the Type 8 framing schedule, so short-span lanes classified as beam substitutions stay beams.","control_attribution":{"horizontal":"Hand-fitted direction and spatial support near visible plan distortion; zero where the image does not clearly require a lateral displacement.","vertical":"Representative downward interpolation, not a measured maximum or a unique assignment of front-view lines to plan lanes.","footprint":"Preserve the existing original-coordinate cuts and slab openings; only explicitly identified retainedBeamRuns override a coarse member omission."}},"82":{"controls":[{"x":48,"z":95,"dx":1,"dy":0,"dz":-3,"radius":18}],"retainedRuns":[],"source":{"citation":"NIST NCSTAR 1-2B, Fig. 9-36, p. 244; front view Fig. 9-35, p. 243","url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101015","plan_image":"analysis/additional-interior-floors/p60-image3-Im121.jpg","plan_image_size_px":[887,410],"front_pdf_printed_page":243,"case":"C","figureAssets":["NIST1-2B_p244_Fig9-36_WTC2_F82_base_plan.jpg","NIST1-2B_p243_Fig9-35_WTC2_base_front.jpg"],"measurementStatus":"Calculated source views constrain framing location, topology and visible distortion. Controls, interpolation and all y displacements are representative; these are not extracted solver nodes."},"image_anchors":{"inspection_size_px":[887,410],"horizontal":{"pixel_axis":"u","anchors":[{"pixel":163,"column":359,"z_ft":96.666666667},{"pixel":839,"column":301,"z_ft":-96.666666667}]},"depth":{"pixel_axis":"v","anchors":[{"pixel":134,"column":417,"x_ft":43.333333333},{"pixel":309,"column":402,"x_ft":93.333333333}]},"manual_uncertainty_px":3,"note":"Right-image is -z (north); down-image is +x (east). The visibly bent core-side ends occupy the southeast part of the east long-span zone. Vertical positions cannot be recovered from this plan projection."},"note":"Small core-side end distortions are visible at the southeast end of the east long-span region. The base-case text explicitly names sag on floors 79 and 81, not 82. Accordingly this new floor 82 profile has zero vertical displacement; its small plan-direction field remains representative.","control_attribution":{"horizontal":"Hand-fitted direction and spatial support near visible plan distortion; zero where the image does not clearly require a lateral displacement.","vertical":"Representative downward interpolation, not a measured maximum or a unique assignment of front-view lines to plan lanes.","footprint":"Preserve the existing original-coordinate cuts and slab openings; only explicitly identified retainedBeamRuns override a coarse member omission."}}},"severe":{"80":{"controls":[{"x":-6.7,"z":94,"dx":2.5,"dy":-3,"dz":-2.5,"radius":19},{"x":20,"z":92,"dx":-2,"dy":-3.5,"dz":-2,"radius":20},{"x":20,"z":76,"dx":1,"dy":-2,"dz":-1.5,"radius":18}],"retainedRuns":[{"id":"WTC2-F80-severe-east-opening-lip","points":[[15.681,-1.333,102.862],[11.297,-2.833,94.202],[9.948,-3.333,82.294],[9.948,-2.333,68.222]],"sourceColumn":425,"pair":true,"depthFt":2.4166666666666665,"source_pixels_with_illustrative_drop":[[692,368,-1],[716,355,-2.5],[749,351,-3],[788,351,-2]],"note":"The lower retained lip visibly turns upward in the rotated plan toward the core; geometry is hand-fitted to that connected run. Polyline follows a visible retained lane in the calculated plan view; point correspondence, pair centerline, and y drop are representative. No floating debris is inferred."}],"source":{"citation":"NIST NCSTAR 1-2, Fig. 7-54, p. 253; front view Fig. 7-53, p. 252","url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101012","plan_image":"analysis/damage_figs/fig7-54_trusses_WTC2_80_81_severe.png","plan_image_size_px":[1700,2200],"front_pdf_printed_page":252,"case":"D"},"image_anchors":{"inspection_size_px":[1376,1780],"horizontal":{"pixel_axis":"v","anchors":[{"pixel":193,"column":443,"x_ft":-43.333333333333336},{"pixel":450,"column":417,"x_ft":43.333333333333336}]},"depth":{"pixel_axis":"u","anchors":[{"pixel":690,"z_ft":103.583333,"feature":"south end or labeled east-face column anchor"},{"pixel":790,"z_ft":67.5,"feature":"core end or labeled east-face column anchor"}]},"note":"Figure is rotated: down-image is world east (+x); right-image is world north (-z). Column443/417 or443/402 register x. East-face columns359/301 register z on floor81."},"note":"The smooth displacement field follows the local direction and scale of visible calculated distortion. Vertical drops and interpolation are representative; explicit retained runs recover selected connected remnants omitted by summary rectangles."},"81":{"controls":[{"x":13.3,"z":87,"dx":2,"dy":-4.5,"dz":-2,"radius":20},{"x":50,"z":78,"dx":5.5,"dy":-8.5,"dz":-3.5,"radius":30},{"x":60,"z":91,"dx":2,"dy":-5.5,"dz":-2.5,"radius":24},{"x":53.3,"z":43,"dx":3,"dy":-5,"dz":-2.5,"radius":27}],"retainedRuns":[{"id":"WTC2-F81-severe-east-core-edge-run","points":[[43.944,-7.333,52.183],[50.71,-4.833,62.106],[69.992,-1.833,62.448],[100.437,-0.333,62.791]],"sourceColumn":349,"pair":true,"depthFt":2.4166666666666665,"source_pixels_with_illustrative_drop":[[590,812,-7],[561,832,-4.5],[560,889,-1.5],[559,979,0]],"note":"Connected east-side primary lane curls away from its original core-side seat in the calculated view; far end returns to the nominal floor level. Polyline follows a visible retained lane in the calculated plan view; point correspondence, pair centerline, and y drop are representative. No floating debris is inferred."}],"source":{"citation":"NIST NCSTAR 1-2, Fig. 7-54, p. 253; front view Fig. 7-53, p. 252","url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101012","plan_image":"analysis/damage_figs/fig7-54_trusses_WTC2_80_81_severe.png","plan_image_size_px":[1700,2200],"front_pdf_printed_page":252,"case":"D"},"image_anchors":{"inspection_size_px":[1376,1780],"horizontal":{"pixel_axis":"v","anchors":[{"pixel":554,"column":443,"x_ft":-43.333333333333336},{"pixel":958,"column":402,"x_ft":93.33333333333333}]},"depth":{"pixel_axis":"u","anchors":[{"pixel":460,"z_ft":96.666667,"feature":"south end or labeled east-face column anchor"},{"pixel":1025,"z_ft":-96.666667,"feature":"core end or labeled east-face column anchor"}]},"note":"Figure is rotated: down-image is world east (+x); right-image is world north (-z). Column443/417 or443/402 register x. East-face columns359/301 register z on floor81."},"note":"The smooth displacement field follows the local direction and scale of visible calculated distortion. Vertical drops and interpolation are representative; explicit retained runs recover selected connected remnants omitted by summary rectangles."},"79":{"controls":[{"x":0,"z":87,"dx":0,"dy":-5,"dz":-3,"radius":23},{"x":-13.3,"z":86,"dx":0,"dy":-3,"dz":-1,"radius":19}],"retainedRuns":[],"source":{"citation":"NIST NCSTAR 1-2B, Fig. 9-85, p. 305; front view Fig. 9-84, p. 304","url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101015","plan_image":"analysis/additional-interior-floors/p121-image0-Im277.png","plan_image_size_px":[292,370],"front_pdf_printed_page":304,"case":"D","figureAssets":["NIST1-2B_p305_Fig9-85_WTC2_F79_severe_plan.png","NIST1-2B_p304_Fig9-84_WTC2_severe_front.jpg"],"measurementStatus":"Calculated source views constrain framing location, topology and visible distortion. Controls, interpolation and all y displacements are representative; these are not extracted solver nodes."},"image_anchors":{"inspection_size_px":[292,370],"horizontal":{"pixel_axis":"v","anchors":[{"pixel":32,"column":443,"x_ft":-43.333333333},{"pixel":333,"column":417,"x_ft":43.333333333}]},"depth":{"pixel_axis":"u","anchors":[{"pixel":151,"z_ft":103.583333333,"feature":"nominal south facade reference"},{"pixel":271,"z_ft":67.5,"feature":"south core edge"}]},"manual_uncertainty_px":3,"note":"Down-image is +x (east); right-image is -z (north). Row registration to named columns is approximate; connection fixity and member section shapes are not identified by this impact plan."},"note":"Detailed calculated plan retains the three selected southeast short-span lanes despite the broad removed rectangle in the summary damage map. Restore only these explicit beam runs. Type 8 material/framing identity follows the project registered floor schedule; the damage figure generic Trusses caption is not evidence to convert beams into paired open-web trusses. Front view constrains downward deformation in aggregate, not each run y coordinate.","control_attribution":{"horizontal":"Hand-fitted direction and spatial support near visible plan distortion; zero where the image does not clearly require a lateral displacement.","vertical":"Representative downward interpolation, not a measured maximum or a unique assignment of front-view lines to plan lanes.","footprint":"Preserve the existing original-coordinate cuts and slab openings; only explicitly identified retainedBeamRuns override a coarse member omission."},"retainedBeamRuns":[{"id":"WTC2-F79-severe-C423-retained-Type8-beam","tower":2,"floor":79,"case":"severe","sourceColumn":423,"memberIds":["WTC2-F79-primary-161","WTC2-F79-primary-163"],"kind":"reconstructed-beam-run","framingType":8,"pair":false,"points":[[23.333333,-0.333333,103.583333],[23.333333,-1.833333,96.366667],[23.333333,-2.833333,89.15],[23.333333,-2.333333,81.933333],[23.333333,-1.333333,74.716667],[23.333333,-0.333333,67.5]],"source_pixels_with_illustrative_drop":[[151,265,0],[175,265,-1.5],[199,265,-2.5],[223,265,-2],[247,265,-1],[271,265,0]],"source_projected_xz_ft":[[23.754153,103.583333],[23.754153,96.366667],[23.754153,89.15],[23.754153,81.933333],[23.754153,74.716667],[23.754153,67.5]],"mapping":{"method":"Column-row topology and 6 ft 8 in nominal lane lattice; register nearly straight pixel row to its nominal column x. Both existing replace:true members are the single beam substitution lane, not two restored trusses.","nominal_column_x_ft":23.333333333333332,"raster_column_residual_ft":0.420819,"maximum_allowed_registration_error_ft":1},"section":{"type":"I-beam","dimensions":"Use existing Type 8 representative beamDepth(original span) and 0.7 ft flange width; exact per-lane section unresolved.","classification":"Floor type and beam substitution supported by NCSTAR 1-2A Table G-1 p. 192 / Fig. G-2 p. 194. South-side orientation is the project registered interpretation; Fig. G-2 itself has no north arrow."},"note":"Connected framing is visible along this complete row in the detailed calculated plan. The coarse removed footprint would omit it, so this explicit run supersedes that member omission only. The inferred y drop is not a NIST nodal value. End fixity, individual connection failure and exact rolled section are unresolved. Keep all slab openings; do not apply the generic displacement field a second time."},{"id":"WTC2-F79-severe-C421-retained-Type8-beam","tower":2,"floor":79,"case":"severe","sourceColumn":421,"memberIds":["WTC2-F79-primary-165","WTC2-F79-primary-167"],"kind":"reconstructed-beam-run","framingType":8,"pair":false,"points":[[30.0,-0.333333,103.583333],[30.0,-1.333333,96.366667],[30.0,-2.083333,89.15],[30.0,-1.583333,81.933333],[30.0,-0.833333,74.716667],[30.0,-0.333333,67.5]],"source_pixels_with_illustrative_drop":[[151,288,0],[175,288,-1],[199,288,-1.75],[223,288,-1.25],[247,288,-0.5],[271,288,0]],"source_projected_xz_ft":[[30.376523,103.583333],[30.376523,96.366667],[30.376523,89.15],[30.376523,81.933333],[30.376523,74.716667],[30.376523,67.5]],"mapping":{"method":"Column-row topology and 6 ft 8 in nominal lane lattice; register nearly straight pixel row to its nominal column x. Both existing replace:true members are the single beam substitution lane, not two restored trusses.","nominal_column_x_ft":30.0,"raster_column_residual_ft":0.376523,"maximum_allowed_registration_error_ft":1},"section":{"type":"I-beam","dimensions":"Use existing Type 8 representative beamDepth(original span) and 0.7 ft flange width; exact per-lane section unresolved.","classification":"Floor type and beam substitution supported by NCSTAR 1-2A Table G-1 p. 192 / Fig. G-2 p. 194. South-side orientation is the project registered interpretation; Fig. G-2 itself has no north arrow."},"note":"Connected framing is visible along this complete row in the detailed calculated plan. The coarse removed footprint would omit it, so this explicit run supersedes that member omission only. The inferred y drop is not a NIST nodal value. End fixity, individual connection failure and exact rolled section are unresolved. Keep all slab openings; do not apply the generic displacement field a second time."},{"id":"WTC2-F79-severe-C419-retained-Type8-beam","tower":2,"floor":79,"case":"severe","sourceColumn":419,"memberIds":["WTC2-F79-primary-169","WTC2-F79-primary-171"],"kind":"reconstructed-beam-run","framingType":8,"pair":false,"points":[[36.666667,-0.333333,103.583333],[36.666667,-0.833333,96.366667],[36.666667,-1.333333,89.15],[36.666667,-1.083333,81.933333],[36.666667,-0.583333,74.716667],[36.666667,-0.333333,67.5]],"source_pixels_with_illustrative_drop":[[151,311,0],[175,311,-0.5],[199,311,-1],[223,311,-0.75],[247,311,-0.25],[271,311,0]],"source_projected_xz_ft":[[36.998893,103.583333],[36.998893,96.366667],[36.998893,89.15],[36.998893,81.933333],[36.998893,74.716667],[36.998893,67.5]],"mapping":{"method":"Column-row topology and 6 ft 8 in nominal lane lattice; register nearly straight pixel row to its nominal column x. Both existing replace:true members are the single beam substitution lane, not two restored trusses.","nominal_column_x_ft":36.666666666666664,"raster_column_residual_ft":0.332226,"maximum_allowed_registration_error_ft":1},"section":{"type":"I-beam","dimensions":"Use existing Type 8 representative beamDepth(original span) and 0.7 ft flange width; exact per-lane section unresolved.","classification":"Floor type and beam substitution supported by NCSTAR 1-2A Table G-1 p. 192 / Fig. G-2 p. 194. South-side orientation is the project registered interpretation; Fig. G-2 itself has no north arrow."},"note":"Connected framing is visible along this complete row in the detailed calculated plan. The coarse removed footprint would omit it, so this explicit run supersedes that member omission only. The inferred y drop is not a NIST nodal value. End fixity, individual connection failure and exact rolled section are unresolved. Keep all slab openings; do not apply the generic displacement field a second time."}]},"82":{"controls":[{"x":51,"z":92,"dx":2,"dy":-3.5,"dz":-4,"radius":24},{"x":48,"z":65,"dx":1,"dy":-2,"dz":-1.5,"radius":18}],"retainedRuns":[],"source":{"citation":"NIST NCSTAR 1-2B, Fig. 9-85, p. 305; front view Fig. 9-84, p. 304","url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101015","plan_image":"analysis/additional-interior-floors/p121-image3-Im280.png","plan_image_size_px":[895,400],"front_pdf_printed_page":304,"case":"D","figureAssets":["NIST1-2B_p305_Fig9-85_WTC2_F82_severe_plan.png","NIST1-2B_p304_Fig9-84_WTC2_severe_front.jpg"],"measurementStatus":"Calculated source views constrain framing location, topology and visible distortion. Controls, interpolation and all y displacements are representative; these are not extracted solver nodes."},"image_anchors":{"inspection_size_px":[895,400],"horizontal":{"pixel_axis":"u","anchors":[{"pixel":177,"column":359,"z_ft":96.666666667},{"pixel":852,"column":301,"z_ft":-96.666666667}]},"depth":{"pixel_axis":"v","anchors":[{"pixel":130,"column":417,"x_ft":43.333333333},{"pixel":310,"column":402,"x_ft":93.333333333}]},"manual_uncertainty_px":3,"note":"Right-image is -z (north); down-image is +x (east). The visibly bent core-side ends occupy the southeast part of the east long-span zone. Vertical positions cannot be recovered from this plan projection."},"note":"The southeast core-side truss ends turn northward in the plan; the front view and p. 304 text identify sag on floors 79-82. The local horizontal/vertical field is a representative fit within this region; distant straight framing and all untraced fractures remain unchanged.","control_attribution":{"horizontal":"Hand-fitted direction and spatial support near visible plan distortion; zero where the image does not clearly require a lateral displacement.","vertical":"Representative downward interpolation, not a measured maximum or a unique assignment of front-view lines to plan lanes.","footprint":"Preserve the existing original-coordinate cuts and slab openings; only explicitly identified retainedBeamRuns override a coarse member omission."}}}}}