{"revision":"Study 02","status":"Original-drawing registration refined with common columns; NOT accepted 2001 geometry","units":"feet","axes":{"x":"east","y":"up from EL310","z":"south"},"source_images":{"a14":"../drawing-review/P18324-p203-upright.png","a22":"../drawing-review/P18324-p211-upright.png"},"source_crop":[1700,680,3460,1340],"matrix_convention":"[pixelX, pixelY, 1] multiplied by each 3x2 matrix gives the named coordinates","a14_pixel_to_site_xz":[[0.08425657114830769,0.0006986321195514784],[-0.0015199233665695935,0.08322864437077128],[34.07378563937571,-583.6232529200453]],"a22_pixel_to_site_xz":[[0.08390103992408536,0.00029614880214225874],[-0.00010422699972074133,0.08323472112087653],[34.449167542495715,-534.6363524600529]],"a22_pixel_to_a14_pixel":[[0.9956908319849527,-0.004806627640478231],[0.0167782312555007,0.9999618329514287],[15.09748551407513,588.4485472698881]],"controls":[{"id":"C1","a14_pixel":[1918,1187],"a22_pixel":[1903,610],"survey_w":9760,"survey_n":5117.5,"role":"fit","a14_site_residual_ft":0.12658919713275896,"a22_site_residual_ft":0.20636602703497192,"paired_drawing_residual_px":3.120138299143356},{"id":"C2","a14_pixel":[2276,1185],"a22_pixel":[2258,610],"survey_w":9730,"survey_n":5117.5,"role":"fit","a14_site_residual_ft":0.10128489401105122,"a22_site_residual_ft":0.3476491181077375,"paired_drawing_residual_px":3.5163290354465864},{"id":"C3","a14_pixel":[3345,1175],"a22_pixel":[3333,600],"survey_w":9640,"survey_n":5117.5,"role":"fit","a14_site_residual_ft":0.12631894751218892,"a22_site_residual_ft":0.21043555749314524,"paired_drawing_residual_px":2.8580573843262593},{"id":"C4","a14_pixel":[1927,1546],"a22_pixel":[1904,962],"survey_w":9760,"survey_n":5087.5,"role":"fit","a14_site_residual_ft":0.13636575600818968,"a22_site_residual_ft":0.5098946052530373,"paired_drawing_residual_px":4.740106753700512},{"id":"C5","a14_pixel":[3348,1534],"a22_pixel":[3334,962],"survey_w":9640,"survey_n":5087.5,"role":"fit","a14_site_residual_ft":0.20061138314667634,"a22_site_residual_ft":0.10760407312856884,"paired_drawing_residual_px":2.897277882571047},{"id":"C6","a14_pixel":[3001,1900],"a22_pixel":[2975,1328],"survey_w":9670,"survey_n":5057.5,"role":"fit","a14_site_residual_ft":0.11491606541066483,"a22_site_residual_ft":0.29261197885352097,"paired_drawing_residual_px":2.545212879142147},{"id":"K1","a14_pixel":[2993,1180],"a22_pixel":[2975,608],"survey_w":9670,"survey_n":5117.5,"role":"check","a14_site_residual_ft":0.49325781262247986,"a22_site_residual_ft":0.35150610100137647,"paired_drawing_residual_px":5.91617255149837},{"id":"K2","a14_pixel":[2283,1543],"a22_pixel":[2258,962],"survey_w":9730,"survey_n":5087.5,"role":"check","a14_site_residual_ft":0.13705630841619384,"a22_site_residual_ft":0.44465877454817543,"paired_drawing_residual_px":4.902848881566162}],"method":"Six distributed column-grid correspondences fit affine transforms; two further columns are withheld as checks. Absolute site fit uses A-E-14 survey labels and the 30 ft grid. A-E-22 northing N5117.50 independently agrees; its blurred westing corner note is not used.","precision_note":"Manual column/grid centres, nominal survey grid, scan deformation and floor-specific encasements limit accuracy. Residuals quantify this drawing fit only; they do not validate the datum or 2001 condition. Report positions to roughly a foot, not the stored numerical precision.","disputed_control":"IRT corner N5151.17 / W9760 reading remains excluded; no replacement accepted.","a22_registration":"Provisionally aligned using common building columns; not by matching the two visible stair ends.","schematic_anchor":{"pixel":[2637,1100],"site_xz_ft":[254.58644805423654,-490.22945121293964],"meaning":"estimated east stair-foot centre, not a measured 2001 point"},"default_study_origin_xz_ft":[195.58644805423654,-498.72945121293964],"accept_for_integration":false}