As reported on IRC, the data in this array is weird somehow. This statement in the mongo shell returns an error:
var ar = [ [ [ -42.48063, -20.2949 ], [ -42.465657, -20.308542 ], [ -42.46568, -20.308727 ], [ -42.465772, -20.309284 ], [ -42.466087, -20.310824 ], [ -42.466588, -20.31333 ], [ -42.466849, -20.314861 ], [ -42.467151, -20.316337 ], [ -42.467343, -20.316769 ], [ -42.467752, -20.316544 ], [ -42.467752, -20.316544 ], [ -42.468346, -20.316247 ], [ -42.468051, -20.315601 ], [ -42.46772, -20.31464 ], [ -42.467498, -20.31356 ], [ -42.467532, -20.31321 ], [ -42.467494, -20.312928 ], [ -42.467412, -20.312619 ], [ -42.467302, -20.312399 ], [ -42.467089, -20.312276 ], [ -42.466883, -20.312084 ], [ -42.466729, -20.311785 ], [ -42.466704, -20.311459 ], [ -42.466807, -20.311146 ], [ -42.467055, -20.310419 ], [ -42.467196, -20.310223 ], [ -42.467316, -20.310072 ], [ -42.467336, -20.309828 ], [ -42.467134, -20.309303 ], [ -42.466883, -20.308754 ], [ -42.466849, -20.308658 ], [ -42.466842, -20.308421 ], [ -42.466859, -20.307858 ], [ -42.467036, -20.307085 ], [ -42.46717, -20.306861 ], [ -42.467548, -20.306087 ], [ -42.467706, -20.305519 ], [ -42.468326, -20.304317 ], [ -42.468503, -20.303841 ], [ -42.468603, -20.303467 ], [ -42.468714, -20.302869 ], [ -42.468803, -20.302734 ], [ -42.468919, -20.302678 ], [ -42.469394, -20.302616 ], [ -42.469845, -20.302537 ], [ -42.470581, -20.302358 ], [ -42.471177, -20.302156 ], [ -42.471779, -20.301859 ], [ -42.472052, -20.301618 ], [ -42.472363, -20.301444 ], [ -42.472731, -20.301332 ], [ -42.473294, -20.301169 ], [ -42.474314, -20.300967 ], [ -42.474905, -20.300782 ], [ -42.475401, -20.300672 ], [ -42.475849, -20.300556 ], [ -42.475978, -20.300486 ], [ -42.476093, -20.300449 ], [ -42.477183, -20.300148 ], [ -42.477493, -20.300093 ], [ -42.477744, -20.300039 ], [ -42.477856, -20.300011 ], [ -42.478036, -20.30001 ], [ -42.478087, -20.300001 ], [ -42.478115, -20.299996 ], [ -42.478089, -20.299893 ], [ -42.478014, -20.299667 ], [ -42.478002, -20.299635 ], [ -42.477983, -20.29953 ], [ -42.477979, -20.299507 ], [ -42.477981, -20.299408 ], [ -42.477993, -20.299335 ], [ -42.478013, -20.29926 ], [ -42.478032, -20.299197 ], [ -42.478045, -20.299136 ], [ -42.478048, -20.299111 ], [ -42.478053, -20.299095 ], [ -42.478063, -20.299082 ], [ -42.478079, -20.299073 ], [ -42.478095, -20.299072 ], [ -42.478112, -20.299076 ], [ -42.478127, -20.299086 ], [ -42.478134, -20.299101 ], [ -42.478309, -20.299092 ], [ -42.478471, -20.299091 ], [ -42.478585, -20.299109 ], [ -42.478701, -20.299128 ], [ -42.479161, -20.299261 ], [ -42.479241, -20.299106 ], [ -42.479304, -20.299004 ], [ -42.479399, -20.298895 ], [ -42.479504, -20.29879 ], [ -42.479609, -20.298697 ], [ -42.479743, -20.298598 ], [ -42.479823, -20.298563 ], [ -42.479787, -20.298273 ], [ -42.479794, -20.297985 ], [ -42.479802, -20.297937 ], [ -42.479813, -20.297885 ], [ -42.479832, -20.297836 ], [ -42.479855, -20.297786 ], [ -42.47992, -20.297691 ], [ -42.479992, -20.297599 ], [ -42.480072, -20.297507 ], [ -42.480113, -20.297467 ], [ -42.48025, -20.297354 ], [ -42.480589, -20.297087 ], [ -42.480672, -20.297008 ], [ -42.48079, -20.296888 ], [ -42.48087, -20.296796 ], [ -42.480939, -20.296705 ], [ -42.480969, -20.296659 ], [ -42.481026, -20.296571 ], [ -42.481087, -20.29647 ], [ -42.48111, -20.296418 ], [ -42.481125, -20.296366 ], [ -42.481128, -20.296347 ], [ -42.481132, -20.296315 ], [ -42.481128, -20.296265 ], [ -42.481116, -20.296196 ], [ -42.481106, -20.29617 ], [ -42.481079, -20.296128 ], [ -42.481048, -20.296092 ], [ -42.48098, -20.296033 ], [ -42.480949, -20.296008 ], [ -42.480877, -20.295966 ], [ -42.480839, -20.295951 ], [ -42.480721, -20.295894 ], [ -42.480675, -20.295867 ], [ -42.480629, -20.295837 ], [ -42.480583, -20.295804 ], [ -42.480507, -20.295728 ], [ -42.480472, -20.29569 ], [ -42.480427, -20.295642 ], [ -42.480395, -20.295607 ], [ -42.480352, -20.29556 ], [ -42.480318, -20.295432 ], [ -42.480324, -20.295364 ], [ -42.480342, -20.295268 ], [ -42.480397, -20.295124 ], [ -42.480482, -20.29499 ], [ -42.48063, -20.2949 ] ], [ [ -42.480404, -20.295841 ], [ -42.480299, -20.295942 ], [ -42.480045, -20.295674 ], [ -42.480149, -20.29557 ], [ -42.480404, -20.295841 ] ] ];
But this statement executes fine. The only difference is changing negative numbers to positive:
var ar = [ [ [ 42.48063, 20.2949 ], [ 42.465657, 20.308542 ], [ 42.46568, 20.308727 ], [ 42.465772, 20.309284 ], [ 42.466087, 20.310824 ], [ 42.466588, 20.31333 ], [ 42.466849, 20.314861 ], [ 42.467151, 20.316337 ], [ 42.467343, 20.316769 ], [ 42.467752, 20.316544 ], [ 42.467752, 20.316544 ], [ 42.468346, 20.316247 ], [ 42.468051, 20.315601 ], [ 42.46772, 20.31464 ], [ 42.467498, 20.31356 ], [ 42.467532, 20.31321 ], [ 42.467494, 20.312928 ], [ 42.467412, 20.312619 ], [ 42.467302, 20.312399 ], [ 42.467089, 20.312276 ], [ 42.466883, 20.312084 ], [ 42.466729, 20.311785 ], [ 42.466704, 20.311459 ], [ 42.466807, 20.311146 ], [ 42.467055, 20.310419 ], [ 42.467196, 20.310223 ], [ 42.467316, 20.310072 ], [ 42.467336, 20.309828 ], [ 42.467134, 20.309303 ], [ 42.466883, 20.308754 ], [ 42.466849, 20.308658 ], [ 42.466842, 20.308421 ], [ 42.466859, 20.307858 ], [ 42.467036, 20.307085 ], [ 42.46717, 20.306861 ], [ 42.467548, 20.306087 ], [ 42.467706, 20.305519 ], [ 42.468326, 20.304317 ], [ 42.468503, 20.303841 ], [ 42.468603, 20.303467 ], [ 42.468714, 20.302869 ], [ 42.468803, 20.302734 ], [ 42.468919, 20.302678 ], [ 42.469394, 20.302616 ], [ 42.469845, 20.302537 ], [ 42.470581, 20.302358 ], [ 42.471177, 20.302156 ], [ 42.471779, 20.301859 ], [ 42.472052, 20.301618 ], [ 42.472363, 20.301444 ], [ 42.472731, 20.301332 ], [ 42.473294, 20.301169 ], [ 42.474314, 20.300967 ], [ 42.474905, 20.300782 ], [ 42.475401, 20.300672 ], [ 42.475849, 20.300556 ], [ 42.475978, 20.300486 ], [ 42.476093, 20.300449 ], [ 42.477183, 20.300148 ], [ 42.477493, 20.300093 ], [ 42.477744, 20.300039 ], [ 42.477856, 20.300011 ], [ 42.478036, 20.30001 ], [ 42.478087, 20.300001 ], [ 42.478115, 20.299996 ], [ 42.478089, 20.299893 ], [ 42.478014, 20.299667 ], [ 42.478002, 20.299635 ], [ 42.477983, 20.29953 ], [ 42.477979, 20.299507 ], [ 42.477981, 20.299408 ], [ 42.477993, 20.299335 ], [ 42.478013, 20.29926 ], [ 42.478032, 20.299197 ], [ 42.478045, 20.299136 ], [ 42.478048, 20.299111 ], [ 42.478053, 20.299095 ], [ 42.478063, 20.299082 ], [ 42.478079, 20.299073 ], [ 42.478095, 20.299072 ], [ 42.478112, 20.299076 ], [ 42.478127, 20.299086 ], [ 42.478134, 20.299101 ], [ 42.478309, 20.299092 ], [ 42.478471, 20.299091 ], [ 42.478585, 20.299109 ], [ 42.478701, 20.299128 ], [ 42.479161, 20.299261 ], [ 42.479241, 20.299106 ], [ 42.479304, 20.299004 ], [ 42.479399, 20.298895 ], [ 42.479504, 20.29879 ], [ 42.479609, 20.298697 ], [ 42.479743, 20.298598 ], [ 42.479823, 20.298563 ], [ 42.479787, 20.298273 ], [ 42.479794, 20.297985 ], [ 42.479802, 20.297937 ], [ 42.479813, 20.297885 ], [ 42.479832, 20.297836 ], [ 42.479855, 20.297786 ], [ 42.47992, 20.297691 ], [ 42.479992, 20.297599 ], [ 42.480072, 20.297507 ], [ 42.480113, 20.297467 ], [ 42.48025, 20.297354 ], [ 42.480589, 20.297087 ], [ 42.480672, 20.297008 ], [ 42.48079, 20.296888 ], [ 42.48087, 20.296796 ], [ 42.480939, 20.296705 ], [ 42.480969, 20.296659 ], [ 42.481026, 20.296571 ], [ 42.481087, 20.29647 ], [ 42.48111, 20.296418 ], [ 42.481125, 20.296366 ], [ 42.481128, 20.296347 ], [ 42.481132, 20.296315 ], [ 42.481128, 20.296265 ], [ 42.481116, 20.296196 ], [ 42.481106, 20.29617 ], [ 42.481079, 20.296128 ], [ 42.481048, 20.296092 ], [ 42.48098, 20.296033 ], [ 42.480949, 20.296008 ], [ 42.480877, 20.295966 ], [ 42.480839, 20.295951 ], [ 42.480721, 20.295894 ], [ 42.480675, 20.295867 ], [ 42.480629, 20.295837 ], [ 42.480583, 20.295804 ], [ 42.480507, 20.295728 ], [ 42.480472, 20.29569 ], [ 42.480427, 20.295642 ], [ 42.480395, 20.295607 ], [ 42.480352, 20.29556 ], [ 42.480318, 20.295432 ], [ 42.480324, 20.295364 ], [ 42.480342, 20.295268 ], [ 42.480397, 20.295124 ], [ 42.480482, 20.29499 ], [ 42.48063, 20.2949 ] ], [ [ 42.480404, 20.295841 ], [ 42.480299, 20.295942 ], [ 42.480045, 20.295674 ], [ 42.480149, 20.29557 ], [ 42.480404, 20.295841 ] ] ];