T1  Is the ground exactly S1's segments and junctions, once each?
    264 segments, 191 junctions
    PASS

T2  Does the local frame give S1's coordinates and lengths back, to the centimetre?
    origin (299180, 5038120), rounded to 10 m
    PASS

T3  Does every height follow the order: 2015 surface, 2016 model, OpenStreetMap, storeys x the height per storey of its use, unknown?
    height per storey, all uses: 3.7450 m from 157 buildings; frame says 3.745
    PASS

T4  Is every S4 building one block, with its outline unchanged?
    296 blocks
    PASS

T5  Does every door sit on its outline, no further from its street than S4 measured (S4 samples every 3 m)?
    a second, independent check of the closest-point rule
    PASS

T6  Is every S6 row either a prop or a photo detection matched to one, and every mapped object one prop?
    2898 S6 rows, 2783 props
    PASS

T7  Does every prop take its class from the table, and every element name its source row?
    PASS

T8  Does the ledger cover every layer, with every row of a known kind?
    31 rows
    PASS

T9  Do the files keep the published format: a version, numbers as numbers, missing as null?
    situ-g1 0.7
    PASS

T10 Does every height in the frame match the terrain, with no outline corner below its building's base?
    z origin 3 m above sea
    PASS

T11 What the world leaves to be checked (report only)
    not seen lately: 34
    count unsure: 26
    height unknown: 14
    ground drops under outline: 10
    2015 and 2016 disagree: 4
    empty in 2015: 3
    street through building: 1
    no door: 1
    heights disagree: 1
    public use: {'public use, hours unknown': 123, 'vacant premises only': 9, 'none recorded': 115, 'public use, hours known': 49}
    2015 surface against OpenStreetMap heights, 14 buildings: median difference +0.37 m, median absolute 0.89 m
    G1's first storey rule (x 3.33 m) against the 2015 surface, 143 buildings: median -1.16 m, median absolute 1.99 m
    2016 model against the 2015 surface, 131 buildings: median -0.03 m, median absolute 0.23 m
    heights by source: {None: 14, 'storeys': 48, 'surface model 2015': 215, 'OpenStreetMap': 13, '3D buildings 2016': 6}
    props: {'tree': 971, 'hydrant': 104, 'seat': 101, 'bike rack': 110, 'water': 4, 'table': 31, 'shelter': 2, 'bin': 38, 'lamp': 803, 'camera': 87, 'crossing mark': 503, 'work zone': 29}

ALL PASS