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Each changed panel retains its own source and operation record."},"floor_bounds":[78,85.4],"columns_covered":[402,403,404,405,406,407,408,409,410,411,412,413,414,415,416,417,418,419,420,421,422,423,424,425,426,427,428,429,430,431,432,433,434,435,436,437,438,439,440,441,442,443,444,445,446,447,448,449,450,451,452,453,454,455,456,457,458],"panels":[{"id":"WTC2-S-C450-452-F76.4-79.4","columns":[450,451,452],"column_centers_ft":[-66.66666666666667,-70.0,-73.33333333333333],"source_color":[0.800000011920929,0.7139849066734314,0.8239871859550476],"evidence_status":"observed_schematic","regions":[{"outer":[[-64.95923,78.72389],[-64.95923,79.08978],[-66.11424,79.08978],[-66.11424,79.40755],[-67.26925,79.40755],[-67.26925,79.08978],[-69.48272,79.09296],[-69.48272,79.4011],[-70.61833,79.39791],[-70.61833,79.08978],[-72.75511,79.08978],[-72.75511,79.40386],[-73.96787,79.40386],[-73.96787,79.0877],[-75.07392,79.0877],[-75.07392,78.72424],[-73.91013,78.72389],[-73.91013,78.08116],[-75.07392,78.08116],[-75.07392,77.71766],[-73.91013,77.71766],[-73.91013,77.40411],[-72.75511,77.40411],[-72.75511,77.71766],[-70.67608,77.71766],[-70.67608,77.40411],[-69.46378,77.40411],[-69.46378,77.71766],[-67.26925,77.71766],[-67.26925,77.40411],[-66.11424,77.40411],[-66.11424,77.72246],[-65.07473,77.72246],[-65.07473,78.08354],[-66.11424,78.08354],[-66.11424,78.72389]],"holes":[[[-69.4732,78.72319],[-67.3367,78.72319],[-67.3367,78.08296],[-69.4732,78.08296]],[[-72.82185,78.72319],[-70.6276,78.72319],[-70.6276,78.08776],[-72.82185,78.08776]]]}],"source_drawing_indices":[25],"nominal_schematic_splice_floor_bounds":[76.4,79.4],"source_spandrel_band_candidates":[{"floor":78,"floor_bounds":[77.71766,78.08536],"observed_edge_ranges":{"lower":[77.71766,77.71766],"upper":[78.08296,78.08776]},"edge_counts":{"lower":2,"upper":2},"method":"Median of long horizontal source edges; band classification is inferred, original profile remains authoritative."},{"floor":79,"floor_bounds":[78.72319,79.08978],"observed_edge_ranges":{"lower":[78.72319,78.72319],"upper":[79.08978,79.08978]},"edge_counts":{"lower":2,"upper":1},"method":"Median of long horizontal source edges; band classification is inferred, original profile remains authoritative."}]},{"id":"WTC2-S-C441-443-F76.4-79.4","columns":[441,442,443],"column_centers_ft":[-36.666666666666664,-40.0,-43.333333333333336],"source_color":[0.800000011920929,0.7139849066734314,0.8239871859550476],"evidence_status":"observed_schematic","regions":[{"outer":[[-34.93161,78.72389],[-34.93161,79.08978],[-36.08663,79.08978],[-36.08663,79.40755],[-37.24117,79.40755],[-37.24117,79.08978],[-39.45465,79.09296],[-39.45465,79.4011],[-40.59072,79.39791],[-40.59072,79.08978],[-42.72704,79.08978],[-42.72704,79.40386],[-43.9398,79.40386],[-43.9398,79.0877],[-45.04585,79.0877],[-45.04585,78.72424],[-43.88206,78.72389],[-43.88206,78.08116],[-45.04585,78.08116],[-45.04585,77.71766],[-43.88206,77.71766],[-43.88206,77.40411],[-42.72704,77.40411],[-42.72704,77.71766],[-40.64847,77.71766],[-40.64847,77.40411],[-39.4357,77.40411],[-39.4357,77.71766],[-37.24117,77.71766],[-37.24117,77.40411],[-36.08663,77.40411],[-36.08663,77.72246],[-35.04712,77.72246],[-35.04712,78.08354],[-36.08663,78.08354],[-36.08663,78.72389]],"holes":[[[-39.44896,78.72319],[-37.31246,78.72319],[-37.31246,78.08296],[-39.44896,78.08296]],[[-42.79763,78.72319],[-40.60338,78.72319],[-40.60338,78.08776],[-42.79763,78.08776]]]}],"source_drawing_indices":[26],"nominal_schematic_splice_floor_bounds":[76.4,79.4],"source_spandrel_band_candidates":[{"floor":78,"floor_bounds":[77.71766,78.08536],"observed_edge_ranges":{"lower":[77.71766,77.71766],"upper":[78.08296,78.08776]},"edge_counts":{"lower":2,"upper":2},"method":"Median of long horizontal source edges; band classification is inferred, original profile remains authoritative."},{"floor":79,"floor_bounds":[78.72319,79.08978],"observed_edge_ranges":{"lower":[78.72319,78.72319],"upper":[79.08978,79.08978]},"edge_counts":{"lower":2,"upper":1},"method":"Median of long horizontal source edges; band classification is inferred, original profile remains authoritative."}]},{"id":"WTC2-S-C432-434-F76.4-79.4","columns":[432,433,434],"column_centers_ft":[-6.666666666666667,-10.0,-13.333333333333334],"source_color":[0.800000011920929,0.7139849066734314,0.8239871859550476],"evidence_status":"observed_schematic_with_local_nist_amendment","regions":[{"outer":[[-7.246377,77.729839],[-9.468599,77.729839],[-9.468599,77.431452],[-10.533981,77.431452],[-10.533981,77.729839],[-12.76699,77.729839],[-12.76699,77.431452],[-13.834951,77.431452],[-13.834951,77.729839],[-15.0,77.729839],[-15.0,78.072414],[-13.834951,78.072414],[-13.834951,78.141379],[-12.76699,78.203448],[-12.76699,78.072414],[-10.533981,78.072414],[-10.533981,78.141379],[-9.468599,78.141379],[-9.468599,78.072414],[-7.246377,78.072414],[-7.246377,78.775862],[-6.859903,78.775862],[-6.086957,78.734483],[-6.086957,78.072414],[-5.31401,78.072414],[-5.31401,77.729839],[-6.086957,77.729839],[-6.086957,77.431452],[-7.21357,77.431452],[-7.246377,77.431452],[-7.246377,77.71766]],"holes":[]}],"source_drawing_indices":[27],"nominal_schematic_splice_floor_bounds":[76.4,79.4],"source_spandrel_band_candidates":[{"floor":78,"floor_bounds":[77.72984,78.07241],"observed_edge_ranges":{"lower":[77.729839,77.729839],"upper":[78.072414,78.072414]},"edge_counts":{"lower":2,"upper":2},"method":"Median of long horizontal source edges; band classification is inferred, original profile remains authoritative."}],"baseline_evidence_status":"observed_schematic","source_override":{"citation":"NIST NCSTAR1-5A final, chapters1-8 Fig. 7-25, p. 111 (local revision); FEMA403, Fig.2-27, p.2-30 (photographic/video interpretation; see explicit estimated and insufficient-information regions)","url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101356"},"source_amendment":{"source":{"report":"NIST NCSTAR1-5A final, chapters1-8","figure":"7-25","printedPage":111,"pdfPage":207,"url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101356","nativeImage":"NIST1-5A-south-pdf207-native0.jpeg","nativeSizePixels":[2403,2255],"pdfImageXref":736,"comparison":"Same observed damage schematic shown in NCSTAR1-2 Executive Summary FigE-46(a), pxciv/PDF96. FigE-46(b) is calculated and is not used for these operations."},"proposal":"analysis/nist-panel-crosscheck/wtc2-correction-proposal.json","operations":[{"id":"WTC2-S-C432-434-F76.4-79.4-NIST7-25-intersection","targetPanelId":"WTC2-S-C432-434-F76.4-79.4","operation":"intersection","polygon":[[-13.834951,78.141379],[-12.76699,78.203448],[-12.76699,78.072414],[-10.533981,78.072414],[-10.533981,78.141379],[-9.468599,78.141379],[-9.468599,78.072414],[-7.246377,78.072414],[-7.246377,78.775862],[-6.859903,78.775862],[-6.086957,78.734483],[-6.086957,78.072414],[-5.31401,78.072414],[-5.31401,77.729839],[-6.086957,77.729839],[-6.086957,77.431452],[-7.246377,77.431452],[-7.246377,77.729839],[-9.468599,77.729839],[-9.468599,77.431452],[-10.533981,77.431452],[-10.533981,77.729839],[-12.76699,77.729839],[-12.76699,77.431452],[-13.834951,77.431452],[-13.834951,77.729839],[-15.0,77.729839],[-15.0,78.072414],[-13.834951,78.072414]],"sourceBoundaryPixels":[[1180,1649],[1191,1640],[1191,1659],[1214,1659],[1214,1649],[1225,1649],[1225,1659],[1248,1659],[1248,1557],[1252,1557],[1260,1563],[1260,1659],[1268,1659],[1268,1703],[1260,1703],[1260,1740],[1248,1740],[1248,1703],[1225,1703],[1225,1740],[1214,1740],[1214,1703],[1191,1703],[1191,1740],[1180,1740],[1180,1703],[1168,1703],[1168,1659],[1180,1659]],"historicalInterpretation":"The NIST lower-edge drawing has three distinct fracture tops: the C432 right stem extends much higher, while C433 and C434 end close above the floor78 spandrel. The higher C433/C434 FEMA remnants are absent in this later unshaded observation schematic. Keep the spandrel and all source-visible lower stems.","priorSource":"FEMA403 Fig2-27 p2-30","retainedHoles":[],"sourceColorPolicy":"Preserve existing panel grouping color; color is not a damage class. This operation replaces geometry provenance with the stated NIST observed source."},{"id":"WTC2-S-C432-434-F76.4-79.4-NIST7-25-union","targetPanelId":"WTC2-S-C432-434-F76.4-79.4","operation":"union","polygon":[[-13.834951,78.141379],[-12.76699,78.203448],[-12.76699,78.072414],[-10.533981,78.072414],[-10.533981,78.141379],[-9.468599,78.141379],[-9.468599,78.072414],[-7.246377,78.072414],[-7.246377,78.775862],[-6.859903,78.775862],[-6.086957,78.734483],[-6.086957,78.072414],[-5.31401,78.072414],[-5.31401,77.729839],[-6.086957,77.729839],[-6.086957,77.431452],[-7.246377,77.431452],[-7.246377,77.729839],[-9.468599,77.729839],[-9.468599,77.431452],[-10.533981,77.431452],[-10.533981,77.729839],[-12.76699,77.729839],[-12.76699,77.431452],[-13.834951,77.431452],[-13.834951,77.729839],[-15.0,77.729839],[-15.0,78.072414],[-13.834951,78.072414]],"sourceBoundaryPixels":[[1180,1649],[1191,1640],[1191,1659],[1214,1659],[1214,1649],[1225,1649],[1225,1659],[1248,1659],[1248,1557],[1252,1557],[1260,1563],[1260,1659],[1268,1659],[1268,1703],[1260,1703],[1260,1740],[1248,1740],[1248,1703],[1225,1703],[1225,1740],[1214,1740],[1214,1703],[1191,1703],[1191,1740],[1180,1740],[1180,1703],[1168,1703],[1168,1659],[1180,1659]],"historicalInterpretation":"The NIST lower-edge drawing has three distinct fracture tops: the C432 right stem extends much higher, while C433 and C434 end close above the floor78 spandrel. The higher C433/C434 FEMA remnants are absent in this later unshaded observation schematic. Keep the spandrel and all source-visible lower stems.","priorSource":"FEMA403 Fig2-27 p2-30","retainedHoles":[],"sourceColorPolicy":"Preserve existing panel grouping color; color is not a damage class. This operation replaces geometry provenance with the stated NIST observed source."}],"original_regions_sha256":"57e702b4d0665499955aa008112ca398c53de35cc25c1928494851a3c0ec292f","displayNote":"NIST\u2019s later observed schematic shows three distinct fracture heights: column 432 retains a tall stem, while columns 433\u2013434 end close above the floor 78 spandrel. The revised contours retain the connecting spandrel and lower stems. Exact depth deformation and fracture surfaces remain representative."}},{"id":"WTC2-S-C426-428-F76.4-79.4","columns":[426,427,428],"column_centers_ft":[13.333333333333334,10.0,6.666666666666667],"source_color":[0.800000011920929,0.7139849066734314,0.8239871859550476],"evidence_status":"observed_schematic_with_local_nist_amendment","regions":[{"outer":[[14.84582,77.72246],[13.80677,77.72246],[13.80677,77.40411],[12.65176,77.40411],[12.65176,77.71766],[10.45722,77.71766],[10.45722,77.40411],[9.24446,77.40411],[9.24446,77.71766],[7.1659,77.71766],[7.1659,77.40411],[6.01089,77.40411],[6.01089,77.71766],[4.84664,77.71766],[4.84664,78.08116],[6.01089,78.08116],[6.01089,78.67931],[5.024155,78.67931],[5.024155,79.068548],[6.183575,79.068548],[6.570048,78.955172],[7.149758,78.851724],[7.922705,78.768966],[8.599034,78.72069],[9.371981,78.67931],[10.45722,78.67931],[10.45722,78.08354],[12.59401,78.08354],[12.59401,78.67931],[12.864078,78.67931],[12.864078,78.872414],[15.097087,78.872414],[15.097087,78.7],[14.029126,78.7],[14.029126,78.67931],[13.80677,78.67931],[13.80677,78.08354],[14.84582,78.08354]],"holes":[[[9.30221,78.08838],[9.2290277,78.67931],[7.10815,78.67931],[7.10815,78.08838]]]}],"source_drawing_indices":[28,29],"nominal_schematic_splice_floor_bounds":[76.4,79.4],"source_spandrel_band_candidates":[{"floor":78,"floor_bounds":[77.71766,78.08596],"observed_edge_ranges":{"lower":[77.71766,77.71766],"upper":[78.08354,78.08838]},"edge_counts":{"lower":2,"upper":2},"method":"Median of long horizontal source edges; band classification is inferred, original profile remains authoritative."},{"targetPanelId":"WTC2-S-C426-428-F76.4-79.4","floor":79,"floor_bounds":[78.67931,79.092742],"nativeYBounds":[1513,1571],"geometryEffect":"Depth classification only; intersect the authoritative retained polygon. No footprint changes.","method":"Nominal floor79 spandrel depth band, registered against adjacent plate top and the source lower border. Retained left curved face and right square fragment stay disconnected. Internal column/plate junctions and out-of-plane fold depths are not measured by this elevation."}],"baseline_evidence_status":"observed_schematic","source_override":{"citation":"NIST NCSTAR1-5A final, chapters1-8 Fig. 7-25, p. 111 (local revision); FEMA403, Fig.2-27, p.2-30 (photographic/video interpretation; see explicit estimated and insufficient-information regions)","url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101356"},"source_amendment":{"source":{"report":"NIST NCSTAR1-5A final, chapters1-8","figure":"7-25","printedPage":111,"pdfPage":207,"url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101356","nativeImage":"NIST1-5A-south-pdf207-native0.jpeg","nativeSizePixels":[2403,2255],"pdfImageXref":736,"comparison":"Same observed damage schematic shown in NCSTAR1-2 Executive Summary FigE-46(a), pxciv/PDF96. FigE-46(b) is calculated and is not used for these operations."},"proposal":"analysis/nist-panel-crosscheck/wtc2-correction-proposal.json","operations":[{"id":"WTC2-S-C426-428-F76.4-79.4-NIST7-25-clear-difference","targetPanelId":"WTC2-S-C426-428-F76.4-79.4","operation":"difference","polygon":[[4.830918,79.358871],[15.194175,79.358871],[15.194175,78.67931],[4.830918,78.67931]],"sourceBoundaryPixels":[[1373,1480],[1480,1480],[1480,1571],[1373,1571]],"historicalInterpretation":"Replace only the unshaded broken upper band. NIST has a left-displaced C428 cap and curved retained edge toward C427, no isolated high C427 tip, and a lower square C426 fragment. All original lower geometry below native y1571 remains unchanged.","priorSource":"FEMA403 Fig2-27 p2-30","partialAmendment":true,"sourceColorPolicy":"Keep existing panel grouping color. NIST observed source governs only the bounded area; retain original FEMA geometry and provenance elsewhere."},{"id":"WTC2-S-C426-428-F76.4-79.4-NIST7-25-clear-union","targetPanelId":"WTC2-S-C426-428-F76.4-79.4","operation":"union","polygon":[[5.024155,79.068548],[6.183575,79.068548],[6.570048,78.955172],[7.149758,78.851724],[7.922705,78.768966],[8.599034,78.72069],[9.371981,78.67931],[5.024155,78.67931]],"sourceBoundaryPixels":[[1375,1516],[1387,1516],[1391,1531],[1397,1546],[1405,1558],[1412,1565],[1420,1571],[1375,1571]],"historicalInterpretation":"Restore the left-displaced C428 top and the retained face below its curved edge toward C427. This manually sampled polyline approximates the visible curve; it is not a measured three-dimensional bend. The broad enclosed white region is retained steel face.","priorSource":"FEMA403 Fig2-27 p2-30","partialAmendment":true,"sourceColorPolicy":"Keep existing panel grouping color. NIST observed source governs only the bounded area; retain original FEMA geometry and provenance elsewhere."},{"id":"WTC2-S-C426-428-F76.4-79.4-NIST7-25-clear-union-right-fragment","targetPanelId":"WTC2-S-C426-428-F76.4-79.4","operation":"union","polygon":[[12.864078,78.872414],[15.097087,78.872414],[15.097087,78.7],[14.029126,78.7],[14.029126,78.67931],[12.864078,78.67931]],"sourceBoundaryPixels":[[1456,1543],[1479,1543],[1479,1568],[1468,1568],[1468,1571],[1456,1571]],"historicalInterpretation":"Restore the source-visible short square C426 fragment, keeping the true white opening between it and the left C428/C427 fragment. The short lower stem joins the untouched original lower C426 member.","priorSource":"FEMA403 Fig2-27 p2-30","partialAmendment":true,"sourceColorPolicy":"Keep existing panel grouping color. NIST observed source governs only the bounded area; retain original FEMA geometry and provenance elsewhere."}],"original_regions_sha256":"97c7e69019d78033cb523224bc2eebb3abf7b3a5d1469b588a0a6ac318351f95","displayNote":"NIST\u2019s observed schematic depicts a displaced left fragment with a curved broken top and a separate right fragment. Their gap remains open. 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FigE-46(b) is calculated and is not used for these operations."},"proposal":"analysis/nist-panel-crosscheck/wtc2-correction-proposal.json","operations":[{"id":"WTC2-S-C411-413-F81.4-84.4-NIST7-25-clear-difference","targetPanelId":"WTC2-S-C411-413-F81.4-84.4","operation":"difference","polygon":[[54.541063,83.125],[58.309179,83.125],[58.309179,83.237903],[61.019417,83.237903],[61.019417,81.4],[54.541063,81.4]],"sourceBoundaryPixels":[[1887,1013],[1926,1013],[1926,999],[1954,999],[1954,1226.9],[1887,1226.9]],"historicalInterpretation":"Remove only the unshaded left portion below the source C413/C412 upper stub ends, before restoring the source-visible lower C412 piece. Native x is at most1954; the gray mask starts near1958 and is excluded. This bounded mask ends at nominal floor81.4; the original upper and right-side geometry is unchanged. No observed state is asserted inside gray.","priorSource":"FEMA403 Fig2-27 p2-30","partialAmendment":true,"sourceColorPolicy":"Keep existing panel grouping color. NIST observed source governs only the bounded area; retain original FEMA geometry and provenance elsewhere."},{"id":"WTC2-S-C411-413-F81.4-84.4-NIST7-25-clear-union","targetPanelId":"WTC2-S-C411-413-F81.4-84.4","operation":"union","polygon":[[59.371981,82.633065],[60.533981,82.649194],[60.533981,82.092742],[61.019417,82.092742],[61.019417,81.729839],[60.533981,81.729839],[60.533981,81.4],[59.371981,81.4]],"sourceBoundaryPixels":[[1937,1074],[1949,1072],[1949,1141],[1954,1141],[1954,1186],[1949,1186],[1949,1226.9],[1937,1226.9]],"historicalInterpretation":"Restore the continuous lower C412 stem and the visible part of its floor82 spandrel. NIST depicts a sloped upper cap at native y1072\u20131074 and no interior break in this lower stem. White within its outline is retained steel. 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band classification is inferred, original profile remains authoritative."}],"baseline_evidence_status":"partly_estimated","source_override":{"citation":"NIST NCSTAR1-5A final, chapters1-8 Fig. 7-25, p. 111 (local revision); FEMA403, Fig.2-27, p.2-30 (photographic/video interpretation; see explicit estimated and insufficient-information regions)","url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101356"},"source_amendment":{"source":{"report":"NIST NCSTAR1-5A final, chapters1-8","figure":"7-25","printedPage":111,"pdfPage":207,"url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101356","nativeImage":"NIST1-5A-south-pdf207-native0.jpeg","nativeSizePixels":[2403,2255],"pdfImageXref":736,"comparison":"Same observed damage schematic shown in NCSTAR1-2 Executive Summary FigE-46(a), pxciv/PDF96. FigE-46(b) is calculated and is not used for these operations."},"proposal":"analysis/nist-panel-crosscheck/wtc2-correction-proposal.json","operations":[{"id":"WTC2-S-C414-416-F80.4-83.4-NIST7-25-intersection","targetPanelId":"WTC2-S-C414-416-F80.4-83.4","operation":"intersection","polygon":[[49.42029,81.407258],[50.57971,81.407258],[50.57971,81.084677],[52.705314,81.084677],[52.705314,81.407258],[53.864734,81.407258],[53.864734,81.084677],[54.637681,81.084677],[54.637681,80.729839],[53.864734,80.729839],[53.864734,80.431452],[52.705314,80.431452],[52.705314,80.729839],[50.57971,80.729839],[50.57971,80.431452],[49.42029,80.431452],[49.42029,80.729839],[48.357488,80.729839],[48.357488,81.084677],[49.42029,81.084677]],"sourceBoundaryPixels":[[1834,1226],[1846,1226],[1846,1266],[1868,1266],[1868,1226],[1880,1226],[1880,1266],[1888,1266],[1888,1310],[1880,1310],[1880,1347],[1868,1347],[1868,1310],[1846,1310],[1846,1347],[1834,1347],[1834,1310],[1823,1310],[1823,1266],[1834,1266]],"historicalInterpretation":"NIST shows only the lower C414/C415 stems and one connecting spandrel fragment. The upper FEMA piece and the C416 continuation lie in the unshaded NIST opening. The white interiors of the two outlined stems and spandrel are retained plate faces, not window holes.","priorSource":"FEMA403 Fig2-27 p2-30","retainedHoles":[],"sourceColorPolicy":"Preserve existing panel grouping color; color is not a damage class. This operation replaces geometry provenance with the stated NIST observed source."},{"id":"WTC2-S-C414-416-F80.4-83.4-NIST7-25-union","targetPanelId":"WTC2-S-C414-416-F80.4-83.4","operation":"union","polygon":[[49.42029,81.407258],[50.57971,81.407258],[50.57971,81.084677],[52.705314,81.084677],[52.705314,81.407258],[53.864734,81.407258],[53.864734,81.084677],[54.637681,81.084677],[54.637681,80.729839],[53.864734,80.729839],[53.864734,80.431452],[52.705314,80.431452],[52.705314,80.729839],[50.57971,80.729839],[50.57971,80.431452],[49.42029,80.431452],[49.42029,80.729839],[48.357488,80.729839],[48.357488,81.084677],[49.42029,81.084677]],"sourceBoundaryPixels":[[1834,1226],[1846,1226],[1846,1266],[1868,1266],[1868,1226],[1880,1226],[1880,1266],[1888,1266],[1888,1310],[1880,1310],[1880,1347],[1868,1347],[1868,1310],[1846,1310],[1846,1347],[1834,1347],[1834,1310],[1823,1310],[1823,1266],[1834,1266]],"historicalInterpretation":"NIST shows only the lower C414/C415 stems and one connecting spandrel fragment. 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FigE-46(b) is calculated and is not used for these operations."},"proposal":"analysis/nist-panel-crosscheck/wtc2-correction-proposal.json","operations":[{"id":"WTC2-S-C429-431-F78.4-81.4-NIST7-25-clear-difference","targetPanelId":"WTC2-S-C429-431-F78.4-81.4","operation":"difference","polygon":[[-5.1,78.4],[5.1,78.4],[5.1,79.0],[-5.1,79.0]],"sourceBoundaryPixels":[[1270.215000000001,1611.499999999999],[1375.784999999999,1611.499999999999],[1375.784999999999,1524.5],[1270.215000000001,1524.5]],"historicalInterpretation":"NIST shows an unshaded white opening above the three lower green panel caps. Remove the three isolated FEMA remnants assigned to this upper gold panel at C429/C430/C431, which extend to floors78.689/78.607/78.756. The bounding operation starts at nominal floor78.4 and ends79.0, below the upper hanging region (minimum79.33895), so it leaves that region and the separate lower green panel unchanged. Independently reviewed from registered original source.","priorSource":"FEMA403 Fig2-27 p2-30","partialAmendment":true,"sourceColorPolicy":"Keep existing panel grouping color. NIST observed source governs only the bounded area; retain original FEMA geometry and provenance elsewhere."}],"original_regions_sha256":"202501dfc9d2f0881058dffeba323377febbf0f0db7344bc9aefd17890faa2ba","displayNote":"NIST\u2019s observed schematic shows open space above the lower panel caps at columns 429\u2013431. Three disconnected remnants present in the FEMA trace are removed in this revision. 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band classification is inferred, original profile remains authoritative."},{"floor":79,"floor_bounds":[78.71995,79.08824],"observed_edge_ranges":{"lower":[78.71995,78.71995],"upper":[79.08584,79.09064]},"edge_counts":{"lower":2,"upper":2},"method":"Median of long horizontal source edges; band classification is inferred, original profile remains authoritative."},{"floor":80,"floor_bounds":[79.72608,80.09197],"observed_edge_ranges":{"lower":[79.72608,79.72608],"upper":[80.09197,80.09197]},"edge_counts":{"lower":2,"upper":1},"method":"Median of long horizontal source edges; band classification is inferred, original profile remains authoritative."}],"baseline_evidence_status":"observed_schematic","source_override":{"citation":"NIST NCSTAR1-5A final, chapters1-8 Fig. 7-25, p. 111 (local revision); FEMA403, Fig.2-27, p.2-30 (photographic/video interpretation; see explicit estimated and insufficient-information regions)","url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101356"},"source_amendment":{"source":{"report":"NIST NCSTAR1-5A final, chapters1-8","figure":"7-25","printedPage":111,"pdfPage":207,"url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101356","nativeImage":"NIST1-5A-south-pdf207-native0.jpeg","nativeSizePixels":[2403,2255],"pdfImageXref":736,"comparison":"Same observed damage schematic shown in NCSTAR1-2 Executive Summary FigE-46(a), pxciv/PDF96. FigE-46(b) is calculated and is not used for these operations."},"proposal":"analysis/nist-panel-crosscheck/wtc2-correction-proposal.json","operations":[{"id":"WTC2-S-C435-437-F77.4-80.4-NIST7-25-clear-difference-C435-gap","targetPanelId":"WTC2-S-C435-437-F77.4-80.4","operation":"difference","polygon":[[-17.718447,78.437931],[-15.582524,78.437931],[-15.582524,78.27931],[-17.718447,78.27931]],"sourceBoundaryPixels":[[1140,1606],[1162,1606],[1162,1629],[1140,1629]],"historicalInterpretation":"The unshaded NIST C435 stem has a distinct upper hanging end cap near native y1606 and separate lower cap near1629. Cut only this observed gap; preserve the original stem alignment and all surrounding plates. Boundary uncertainty is approximately2pixels.","priorSource":"FEMA403 Fig2-27 p2-30","partialAmendment":true,"sourceColorPolicy":"Keep existing panel grouping color. NIST observed source governs only the bounded area; retain original FEMA geometry and provenance elsewhere."},{"id":"WTC2-S-C435-437-F77.4-80.4-NIST7-25-clear-difference-C436-gap","targetPanelId":"WTC2-S-C435-437-F77.4-80.4","operation":"difference","polygon":[[-21.014493,78.375862],[-18.980583,78.375862],[-18.980583,78.251724],[-21.014493,78.251724]],"sourceBoundaryPixels":[[1106,1615],[1127,1615],[1127,1633],[1106,1633]],"historicalInterpretation":"The unshaded NIST C436 stem has separate end caps near native y1615 and1633. Cut only this observed gap. C437 is not changed: a dotted aluminum-cladding mark crosses it, without an independently visible severed-cap pair that would establish the same gap.","priorSource":"FEMA403 Fig2-27 p2-30","partialAmendment":true,"sourceColorPolicy":"Keep existing panel grouping color. NIST observed source governs only the bounded area; retain original FEMA geometry and provenance elsewhere."}],"original_regions_sha256":"50cdbcad5dd14948dfa9a745b240c241dca447332e8d1d820dcb890e4f88c711","displayNote":"NIST shows short gaps at columns 435 and 436, with retained ends above and below. Those gaps now appear in the shared geometry. The adjacent mark at column 437 concerns cladding and does not establish a steel gap. Exact fracture surfaces remain representative."}},{"id":"WTC2-S-C423-425-F77.4-80.4","columns":[423,424,425],"column_centers_ft":[23.333333333333332,20.0,16.666666666666668],"source_color":[0.9329976439476013,0.7449912428855896,0.6709849834442139],"evidence_status":"observed_schematic_with_local_nist_amendment","regions":[{"outer":[[24.72342,78.07971],[24.72342,77.70902],[23.74176,77.70902],[23.74176,77.39132],[22.58686,77.39132],[22.58686,77.71386],[20.33481,77.71386],[20.33481,77.39132],[19.18038,77.39132],[19.18038,77.70902],[17.10156,77.70902],[17.10156,77.39132],[15.83118,77.39132],[15.83118,77.71386],[14.73402,77.71386],[14.73402,78.07491],[15.88892,78.07491],[15.88892,78.7],[14.805825,78.7],[14.805825,78.872414],[17.621359,78.872414],[19.368932,79.020161],[19.368932,79.116935],[20.528846,79.133065],[20.528846,79.052419],[22.740385,79.092742],[22.740385,79.221774],[23.894231,79.237903],[23.894231,79.092742],[25.240385,79.092742],[25.240385,78.7],[23.68402,78.7],[23.68402,78.07971]],"holes":[[[17.04382,78.08451],[19.12263,78.08451],[19.12263,78.7],[17.04382,78.7]],[[20.33481,78.08451],[22.52912,78.08451],[22.52912,78.7],[20.33481,78.7]]]}],"source_drawing_indices":[408],"nominal_schematic_splice_floor_bounds":[77.4,80.4],"source_spandrel_band_candidates":[{"floor":78,"floor_bounds":[77.71144,78.08451],"observed_edge_ranges":{"lower":[77.70902,77.71386],"upper":[78.08451,78.08451]},"edge_counts":{"lower":2,"upper":2},"method":"Median of long horizontal source edges; band classification is inferred, original profile remains authoritative."},{"targetPanelId":"WTC2-S-C423-425-F77.4-80.4","floor":79,"floor_bounds":[78.7,79.092742],"nativeYBounds":[1513,1568],"geometryEffect":"Depth classification only; intersect the authoritative retained polygon. No footprint changes.","method":"Nominal floor79 spandrel upper/lower outline levels visible at the intact right margin and lower horizontal border. The sloped broken upper edge removes only the footprint above itself; it does not erase retained spandrel below that edge."}],"baseline_evidence_status":"observed_schematic","source_override":{"citation":"NIST NCSTAR1-5A final, chapters1-8 Fig. 7-25, p. 111 (local revision); FEMA403, Fig.2-27, p.2-30 (photographic/video interpretation; see explicit estimated and insufficient-information regions)","url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101356"},"source_amendment":{"source":{"report":"NIST NCSTAR1-5A final, chapters1-8","figure":"7-25","printedPage":111,"pdfPage":207,"url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101356","nativeImage":"NIST1-5A-south-pdf207-native0.jpeg","nativeSizePixels":[2403,2255],"pdfImageXref":736,"comparison":"Same observed damage schematic shown in NCSTAR1-2 Executive Summary FigE-46(a), pxciv/PDF96. FigE-46(b) is calculated and is not used for these operations."},"proposal":"analysis/nist-panel-crosscheck/wtc2-correction-proposal.json","operations":[{"id":"WTC2-S-C423-425-F77.4-80.4-NIST7-25-clear-difference","targetPanelId":"WTC2-S-C423-425-F77.4-80.4","operation":"difference","polygon":[[14.514563,80.004032],[25.432692,80.004032],[25.432692,78.7],[14.514563,78.7]],"sourceBoundaryPixels":[[1473,1400],[1586,1400],[1586,1568],[1473,1568]],"historicalInterpretation":"Replace only the broken upper part above the source floor79 spandrel lower boundary. The source C423 top is near native1495, substantially below the FEMA remnant; the left broken edge also slopes differently. Retain the existing lower stems, floor78 spandrel and lower windows.","priorSource":"FEMA403 Fig2-27 p2-30","partialAmendment":true,"sourceColorPolicy":"Keep existing panel grouping color. NIST observed source governs only the bounded area; retain original FEMA geometry and provenance elsewhere."},{"id":"WTC2-S-C423-425-F77.4-80.4-NIST7-25-clear-union","targetPanelId":"WTC2-S-C423-425-F77.4-80.4","operation":"union","polygon":[[14.805825,78.872414],[17.621359,78.872414],[19.368932,79.020161],[19.368932,79.116935],[20.528846,79.133065],[20.528846,79.052419],[22.740385,79.092742],[22.740385,79.221774],[23.894231,79.237903],[23.894231,79.092742],[25.240385,79.092742],[25.240385,78.7],[14.805825,78.7]],"sourceBoundaryPixels":[[1476,1543],[1505,1543],[1523,1522],[1523,1510],[1535,1508],[1535,1518],[1558,1513],[1558,1497],[1570,1495],[1570,1513],[1584,1513],[1584,1568],[1476,1568]],"historicalInterpretation":"Restore the NIST-observed broken upper plate and short C424/C423 protruding stems. The top climbs diagonally from the C425 end toward C424, then slopes to C423; white enclosed between this top and the lower horizontal border is retained spandrel plate, not an opening. Curvature is simplified within raster-stroke precision; no 3D displacement is inferred.","priorSource":"FEMA403 Fig2-27 p2-30","partialAmendment":true,"sourceColorPolicy":"Keep existing panel grouping color. NIST observed source governs only the bounded area; retain original FEMA geometry and provenance elsewhere."}],"original_regions_sha256":"38d92a0227def2cd8725185b40477ada5c5521a74065f2acb246a2dee2a16ea0","displayNote":"NIST\u2019s revised lower boundary has a shorter column 423 end and a sloping broken spandrel. The retained plate follows that boundary. Lower stems and windows keep their FEMA contours. Exact depth deformation and fracture surfaces remain representative."}},{"id":"WTC2-S-C414-416-F77.4-80.4","columns":[414,415,416],"column_centers_ft":[53.333333333333336,50.0,46.666666666666664],"source_color":[0.9329976439476013,0.7449912428855896,0.6709849834442139],"evidence_status":"observed_schematic","regions":[{"outer":[[44.90316,79.72639],[44.90316,80.08989],[46.01,80.08989],[46.01,80.40967],[47.22264,80.40967],[47.22264,80.09197],[49.35875,80.09197],[49.35875,80.40007],[50.49332,80.40326],[50.49332,80.09515],[52.70796,80.09197],[52.70796,80.40967],[53.86238,80.40967],[53.86238,80.09197],[55.01728,80.09197],[55.01728,79.72608],[53.86238,79.72608],[53.86238,79.08584],[54.90179,79.08584],[54.90179,78.72479],[53.86238,78.72479],[53.86238,78.07971],[54.90179,78.07971],[54.90179,77.70902],[53.92013,77.70902],[53.92013,77.39132],[52.7657,77.39132],[52.7657,77.71386],[50.51365,77.71386],[50.51365,77.39132],[49.35875,77.39132],[49.35875,77.70902],[47.04942,77.70902],[47.04942,77.39132],[46.01,77.39132],[46.01,77.71386],[44.91286,77.71386],[44.91286,78.07491],[46.06776,78.07491],[46.06776,78.71995],[44.90316,78.71995],[44.90316,79.08346],[46.06776,79.08346],[46.06776,79.72608]],"holes":[[[47.20413,78.71942],[49.28275,78.71942],[49.28275,78.08404],[47.20413,78.08404]],[[50.49481,78.71942],[52.68891,78.71942],[52.68891,78.08404],[50.49481,78.08404]],[[50.49481,79.72545],[52.63117,79.72545],[52.63117,79.08527],[50.49481,79.08527]],[[47.14639,79.72545],[49.34049,79.72545],[49.34049,79.09007],[47.14639,79.09007]]]}],"source_drawing_indices":[409],"nominal_schematic_splice_floor_bounds":[77.4,80.4],"source_spandrel_band_candidates":[{"floor":78,"floor_bounds":[77.71144,78.08404],"observed_edge_ranges":{"lower":[77.70902,77.71386],"upper":[78.08404,78.08404]},"edge_counts":{"lower":2,"upper":2},"method":"Median of long horizontal source edges; band classification is inferred, original profile remains authoritative."},{"floor":79,"floor_bounds":[78.71942,79.08767],"observed_edge_ranges":{"lower":[78.71942,78.71942],"upper":[79.08527,79.09007]},"edge_counts":{"lower":2,"upper":2},"method":"Median of long horizontal source edges; band classification is inferred, original profile remains authoritative."},{"floor":80,"floor_bounds":[79.72545,80.09197],"observed_edge_ranges":{"lower":[79.72545,79.72545],"upper":[80.09197,80.09197]},"edge_counts":{"lower":2,"upper":1},"method":"Median of long horizontal source edges; band classification is inferred, original profile remains authoritative."}]},{"id":"WTC2-S-C405-407-F77.4-80.4","columns":[405,406,407],"column_centers_ft":[83.33333333333333,80.0,76.66666666666667],"source_color":[0.9329976439476013,0.7449912428855896,0.6709849834442139],"evidence_status":"observed_schematic","regions":[{"outer":[[74.77433,79.72639],[74.77433,80.08989],[75.88117,80.08989],[75.88117,80.40967],[77.09336,80.40967],[77.09336,80.09197],[79.22992,80.09197],[79.22992,80.40007],[80.36494,80.40326],[80.36494,80.09515],[82.57865,80.09197],[82.57865,80.40967],[83.73355,80.40967],[83.73355,80.09197],[84.88844,80.09197],[84.88844,79.72608],[83.73355,79.72608],[83.73355,79.08584],[84.77295,79.08584],[84.77295,78.72479],[83.73355,78.72479],[83.73355,78.07971],[84.77295,78.07971],[84.77295,77.70902],[83.79129,77.70902],[83.79129,77.39132],[82.63639,77.39132],[82.63639,77.71386],[80.38481,77.71386],[80.38481,77.39132],[79.22992,77.39132],[79.22992,77.70902],[76.92012,77.70902],[76.92012,77.39132],[75.88117,77.39132],[75.88117,77.71386],[74.78403,77.71386],[74.78403,78.07491],[75.93893,78.07491],[75.93893,78.71995],[74.77433,78.71995],[74.77433,79.08346],[75.93893,79.08346],[75.93893,79.72608]],"holes":[[[77.07194,78.71942],[79.15055,78.71942],[79.15055,78.08404],[77.07194,78.08404]],[[80.36308,78.71942],[82.55716,78.71942],[82.55716,78.08404],[80.36308,78.08404]],[[80.36308,79.72545],[82.49943,79.72545],[82.49943,79.08527],[80.36308,79.08527]],[[77.01419,79.72545],[79.20829,79.72545],[79.20829,79.09007],[77.01419,79.09007]]]}],"source_drawing_indices":[410],"nominal_schematic_splice_floor_bounds":[77.4,80.4],"source_spandrel_band_candidates":[{"floor":78,"floor_bounds":[77.71144,78.08404],"observed_edge_ranges":{"lower":[77.70902,77.71386],"upper":[78.08404,78.08404]},"edge_counts":{"lower":2,"upper":2},"method":"Median of long horizontal source edges; band classification is inferred, original profile remains authoritative."},{"floor":79,"floor_bounds":[78.71942,79.08767],"observed_edge_ranges":{"lower":[78.71942,78.71942],"upper":[79.08527,79.09007]},"edge_counts":{"lower":2,"upper":2},"method":"Median of long horizontal source edges; band classification is inferred, original profile remains authoritative."},{"floor":80,"floor_bounds":[79.72545,80.09197],"observed_edge_ranges":{"lower":[79.72545,79.72545],"upper":[80.09197,80.09197]},"edge_counts":{"lower":2,"upper":1},"method":"Median of long horizontal source edges; band classification is inferred, original profile remains authoritative."}]}],"uncertainty_note":"FEMA estimates damage to columns413-418 at levels81-82; insufficient information to detail damage to columns408-411 at levels83-84. Missing detail is not evidence of intact members.","nist_aggregate":{"source":"NIST NCSTAR 1-2 Finding17","severed":[[410,436],[438,439]],"heavy":[[437,437]],"note":"Unique-column states, not per-floor fracture extents."},"uncertain_regions":[{"category":"estimated","columns":[413,414,415,416,417,418],"levels":[81,82],"source":"FEMA 403 Fig. 2-27, p. 2-30, note 2","note":"Damage estimated in the source diagram."},{"category":"insufficient_information","columns":[408,409,410,411],"levels":[83,84],"source":"FEMA 403 Fig. 2-27, p. 2-30, note 3","note":"Insufficient information for the damage detail. Neither intact nor absent steel is confirmed here."},{"id":"WTC2-S-NIST7-25-smoke-obscured","category":"insufficient_information","boundsOnly":true,"nativePixelBounds":[1954,728,2208,1098],"xFtBounds":[61.019417,85.603865],"floorBounds":[82.439516,85.421687],"columnBounds":[404.318841,411.694175],"columns":[405,406,407,408,409,410,411,412],"levels":[82,83,84,85],"source":{"report":"NIST NCSTAR1-5A final, chapters1-8","figure":"7-25","printedPage":111,"pdfPage":207,"url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101356","nativeImage":"NIST1-5A-south-pdf207-native0.jpeg","nativeSizePixels":[2403,2255],"pdfImageXref":736,"comparison":"Same observed damage schematic shown in NCSTAR1-2 Executive Summary FigE-46(a), pxciv/PDF96. FigE-46(b) is calculated and is not used for these operations."},"geometryEffect":"none","note":"Conservative display-only bounds around the gray smoke mask. The actual mask is curved/diagonal and does not occupy the full box. These bounds intentionally include a small pixel margin; they do not classify steel as retained or removed and produce no geometry Boolean operation."}],"depth_policy":"Nominal 14 in hollow column walls follow retained source contours. Source-edge spandrel-band classification and concealed stem continuation are inferred. Spandrels replace inner column webs at the recessed inside face (NIST 1-1 p11; 1-2A p38). No measured entry-wall depth deformation is assigned. The north exit has a separately sourced retained-fragment supplement with representative bend amounts.","render_revision":"retained-box-members-v4","case_policy":{"entry_geometry":"observed_schematic","case_dependent":false,"calculated_exterior_mesh_reproduced":false,"basis":"The base/more-severe selector changes calculated interior damage. Published calculated exterior figures are separate comparison evidence, not the rendered exterior mesh."},"nist_crosscheck":{"status":"bounded_observed_corrections_integrated","changedPanelIds":["WTC2-S-C414-416-F80.4-83.4","WTC2-S-C417-419-F79.4-82.4","WTC2-S-C432-434-F76.4-79.4","WTC2-S-C411-413-F81.4-84.4","WTC2-S-C423-425-F77.4-80.4","WTC2-S-C429-431-F78.4-81.4","WTC2-S-C426-428-F76.4-79.4","WTC2-S-C435-437-F77.4-80.4"],"note":"Verified local revisions are integrated; unchanged FEMA contours and unresolved source regions are not certified as an exact NIST mesh. Calculated exterior case meshes remain comparison evidence."},"baseline_source":{"citation":"FEMA403, Fig.2-27, p.2-30 (photographic/video interpretation; see explicit estimated and insufficient-information regions)","url":"https://www.fema.gov/pdf/library/fema403_ch2.pdf","figure":"2-27","report":"FEMA403","printed_page":"2-30","trace_method":"Original PDF vector contours with window openings subtracted. Diagram is schematic, not a dimensional survey."},"nist_crosscheck_limits":["C411\u2013413 is amended only in its clear left portion. The gray smoke mask and remaining right-side FEMA geometry are not classified from absent outlines. Gray is not inferred removed or intact.","C423\u2013425 upper F80.4\u201383.4 retains its enclosed floor82 spandrel plate. Internal column outline strokes ending within the white plate do not create a void. Remaining local corner/edge differences are approximately a few native pixels, near registration and schematic-stroke precision.","The black dotted wing/tail lines identify marks on aluminum cladding, not severed steel; they produce no clipping operation."]}}