MySQL geometry intersection produces non-intersecting results

I have a MySQL table of postcodes with the geometric area of each saved as a polygon. I also have a table of regional areas that are also polygons. I'm doing a simple query to find the intersecting area for a particular postcode (ie to find which area it belongs to) but I'm getting areas returned that do not intersect at all.

Here is my query:

SELECT a.*, pc.StateID AS PostcodeStateID
FROM area a
 JOIN postcode pc ON INTERSECTS(pc.Geometry, a.Geometry)
WHERE pc.Postcode = '4065'

Why is MySQL returning results that don't intersect? Is there an error in my query?

Here is the polygon for the postcode 4065:

POLYGON((152.9871 -27.448586,152.98726 -27.448668,152.987373 -27.448625,152.987458 -27.448574,152.987604 -27.448519,152.987771 -27.448446,152.988061 -27.448355,152.988173 -27.448282,152.98834 -27.44814,152.988498 -27.448048,152.988658 -27.447966,152.988843 -27.447963,152.988904 -27.448012,152.988949 -27.448143,152.988935 -27.448316,152.988908 -27.448474,152.988972 -27.448616,152.989126 -27.448805,152.989213 -27.448971,152.989352 -27.449098,152.9896 -27.449201,152.989764 -27.449225,152.989941 -27.449326,152.990131 -27.449307,152.990288 -27.44932,152.990427 -27.449238,152.990628 -27.449156,152.990844 -27.449044,152.990994 -27.448949,152.991106 -27.448904,152.991606 -27.44891,152.991756 -27.448928,152.991745 -27.44899,152.991725 -27.449105,152.991708 -27.449198,152.992 -27.449173,152.992137 -27.449201,152.992113 -27.449339,152.992071 -27.449333,152.992063 -27.449471,152.992054 -27.449609,152.992043 -27.449793,152.992062 -27.449796,152.991999 -27.44992,152.991886 -27.450141,152.99159 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South Queensland polygon:

POLYGON((152.608337402344 -28.2656823901465,152.578125 -28.3297687914445,152.528686523438 -28.3043806829628,152.530059814453 -28.2608441148048,152.479248046875 -28.2608441148048,152.479248046875 -28.2608441148048,152.369384765625 -28.3527337602378,152.369384765625 -28.3527337602378,152.29248046875 -28.3962327116804,152.210083007812 -28.4542035499492,152.210083007812 -28.4542035499492,152.16064453125 -28.4155598516658,152.16064453125 -28.4155598516658,151.979370117188 -28.5266224186481,151.979370117188 -28.5266224186481,151.979370117188 -28.5989915677057,151.979370117188 -28.5989915677057,152.039794921875 -28.7532125379903,152.039794921875 -28.7532125379903,152.02880859375 -28.868729056029,151.990356445312 -28.9072060763367,151.990356445312 -28.9072060763367,151.847534179688 -28.9072060763367,151.847534179688 -28.9072060763367,151.688232421875 -28.8879693483034,151.688232421875 -28.8879693483034,151.490478515625 -28.950475674848,151.490478515625 -28.950475674848,151.28173828125 -28.9120147012556,151.28173828125 -28.9120147012556,151.116943359375 -28.8350499726352,151.116943359375 -28.8350499726352,151.023559570312 -28.8254253744772,151.023559570312 -28.8254253744772,151.007080078125 -28.714678586706,150.75439453125 -28.6134594240044,150.75439453125 -28.6134594240044,150.748901367188 -28.555576049186,150.748901367188 -28.555576049186,150.53466796875 -28.4831770585708,150.53466796875 -28.4831770585708,150.27099609375 -28.5314485763192,150.27099609375 -28.5314485763192,149.87548828125 -28.6279252876186,149.87548828125 -28.6279252876186,149.661254882812 -28.6038144078413,149.661254882812 -28.6038144078413,149.556884765625 -28.5700498796474,149.4580078125 -28.5845217193704,149.4580078125 -28.5845217193704,149.375610351562 -28.700224692777,149.375610351562 -28.700224692777,149.12841796875 -28.8157998864873,149.12841796875 -28.8157998864873,148.936157226562 -28.9985318140518,140.99853515625 -29.0081403629782,140.99853515625 -26.0024871419457,138.004760742188 -25.9926124897092,137.96630859375 -24.8764699108315,137.96630859375 -24.8764699108315,140.55908203125 -24.806681353852,140.55908203125 -24.806681353852,143.173828125 -25.284437746983,143.173828125 -25.284437746983,144.810791015625 -24.567108352576,144.810791015625 -24.567108352576,145.34912109375 -24.1066471792018,145.34912109375 -24.1066471792018,146.6015625 -24.1868474285212,146.6015625 -24.1868474285212,149.798583984375 -25.1751165316218,151.23779296875 -24.6969342263667,152.017822265625 -24.4971463205719,152.149658203125 -24.6470171626304,152.149658203125 -24.6470171626304,152.314453125 -24.7568083111927,152.314453125 -24.7568083111927,152.479248046875 -24.6969342263667,152.479248046875 -24.6969342263667,152.51220703125 -24.966140159913,152.51220703125 -24.966140159913,152.698974609375 -25.1850588835807,152.698974609375 -25.1850588835807,152.874755859375 -25.2148810711326,152.874755859375 -25.2148810711326,153.12744140625 -25.0557451170153,153.204345703125 -24.9163314045991,153.204345703125 -24.9163314045991,153.138427734375 -24.746831298412,153.138427734375 -24.746831298412,153.226318359375 -24.6570021732791,153.336181640625 -24.9262947663956,153.336181640625 -24.9262947663956,153.094482421875 -25.7801071184222,153.088989257812 -25.8097819758404,152.792358398438 -25.8246166182321,152.792358398438 -25.8246166182321,152.166137695312 -25.8888785821271,152.166137695312 -25.8888785821271,152.138671875 -26.071586453171,152.138671875 -26.071586453171,152.259521484375 -26.2638622801111,152.259521484375 -26.2638622801111,152.391357421875 -26.3967902051027,152.391357421875 -26.3967902051027,152.627563476562 -26.5639633713402,152.627563476562 -26.5639633713402,152.589111328125 -26.7603258373944,152.589111328125 -26.7603258373944,152.611083984375 -26.8926790959082,152.611083984375 -26.8926790959082,152.814331054688 -27.0786915529275,152.698974609375 -27.1202574690006,152.738800048828 -27.381523191705,152.738800048828 -27.381523191705,152.873382568359 -27.7552536093976,152.876129150391 -27.7576841561385,152.832183837891 -27.885211577912开发者_开发技巧2,152.832183837891 -27.8852115779122,152.826690673828 -28.075615439519,152.826690673828 -28.075615439519,152.86376953125 -28.3116350467506,152.81982421875 -28.3370214231953,152.764892578125 -28.3527337602378,152.764892578125 -28.3527337602378,152.690734863281 -28.3333951691964,152.690734863281 -28.3333951691964,152.655029296875 -28.3067988591941,152.628936767578 -28.3043806829628,152.628936767578 -28.3043806829628,152.608337402344 -28.2656823901465))

North Brisbane Polygon:

POLYGON((153.0392074585 -27.418404876708,153.06083679199 -27.414138203938,153.08109283447 -27.414138203938,153.08624267578 -27.424804576823,153.08692932129 -27.43607933646,153.09722900391 -27.443087390371,153.1010055542 -27.447048267433,153.11405181885 -27.441259245303,153.12023162842 -27.43272750118,153.14357757568 -27.421757146832,153.15628051758 -27.402251603719,153.164176940918 -27.3589613881093,153.105125427246 -27.3388348190319,153.073883056641 -27.2845358519143,153.102722167969 -27.2662268432579,153.114395141602 -27.2633276402901,153.123664855957 -27.231889324324,153.116970062256 -27.1883799269902,153.101348876953 -27.1903649358738,153.04676055908 -27.192960663416,153.034400939941 -27.1775381013414,153.0704498291 -27.109867436717,152.99354553223 -27.03649860919,152.90840148926 -27.024265804424,152.85484313965 -27.031605647184,152.80883789062 -27.101921467004,152.71476745605 -27.131868716147,152.70858764648 -27.214945578838,152.72163391113 -27.331515160145,152.75939941406 -27.412614352295,152.83836364746 -27.472942804291,152.85209655762 -27.444306136921,152.86239624023 -27.406518735533,152.90084838867 -27.398593931034,152.91595458984 -27.371157528764,152.941360473633 -27.3656694317512,152.987022399902 -27.3757307350603,153.001098632812 -27.3882298678595,153.014144897461 -27.4071283123416,153.027534484863 -27.4153572701181,153.0392074585 -27.418404876708))

Inner Brisbane polygon:

POLYGON((153.09482574463 -27.483146627112,153.10941696167 -27.503855957645,153.10735702515 -27.51786300129,153.08881759644 -27.534151558368,153.09396743774 -27.544501910396,153.11319351196 -27.547393746242,153.14580917358 -27.56580838805,153.13997268677 -27.598520997659,153.12726974487 -27.605062348558,153.09259414673 -27.612059640474,153.05276870728 -27.615558118831,153.00590515137 -27.625444518702,152.99509048462 -27.648103820206,152.96659469604 -27.642933654548,152.92385101318 -27.61571022405,152.91904449463 -27.590762145112,152.86308288574 -27.580720462015,152.85999298096 -27.544806317754,152.8551864624 -27.515274877553,152.83184051514 -27.487410631243,152.85106658936 -27.445829551176,152.86308288574 -27.406213945867,152.90153503418 -27.398898741713,152.91595458984 -27.369633084668,152.941017150879 -27.3638400056117,152.988739013672 -27.3739014752212,153.004188537598 -27.3873153450577,153.016548156738 -27.405909155361,153.038177490234 -27.4162715609242,153.079719543457 -27.4126143522949,153.087959289551 -27.4248045768235,153.087959289551 -27.4354699194348,153.099975585938 -27.4446108214545,153.089160919189 -27.446743589631,153.060321807861 -27.4406498568828,153.050022125244 -27.4417162844096,153.043155670166 -27.4414115918823,153.040409088135 -27.4350128544576,153.032341003418 -27.4456772106967,153.017749786377 -27.4418686303578,153.00178527832 -27.4465912504143,152.999897003174 -27.4502473335489,152.990627288818 -27.4470482674331,152.989940643311 -27.4645658255604,152.995777130127 -27.4698967038784,153.004875183105 -27.4747704241218,153.012256622314 -27.4697443966476,153.017406463623 -27.468830548842,153.026332855225 -27.4797962223421,153.030796051025 -27.4808622712773,153.033542633057 -27.4761411191008,153.032341003418 -27.4668505192685,153.035945892334 -27.4633473028864,153.039035797119 -27.4670028304985,153.04126739502 -27.4752273243429,153.045558929443 -27.4767503113957,153.054656982422 -27.4720289830085,153.056373596191 -27.4689828573358,153.052253723145 -27.4625857193753,153.04967880249 -27.4433920782702,153.058433532715 -27.4417162844096,153.087100982666 -27.4484193071291,153.101348876953 -27.4458295511756,153.108730316162 -27.4510090022823,153.117485046387 -27.469287473692,153.097915649414 -27.4769026089431,153.09482574463 -27.483146627112))

Brisbane CBD polygon:

POLYGON((153.041095733643 -27.4337940052648,153.044013977051 -27.4409545515136,153.049507141113 -27.442478012047,153.052425384521 -27.4630426701134,153.056373596191 -27.4686782401377,153.054656982422 -27.4720289830085,153.045558929443 -27.4767503113957,153.04126739502 -27.4752273243429,153.038864135742 -27.4673074523273,153.035945892334 -27.4634996189573,153.032341003418 -27.4665458961769,153.033456802368 -27.4756842226692,153.03053855896 -27.4810907089926,153.026847839355 -27.4799485156788,153.017234802246 -27.468830548842,153.012256622314 -27.4697443966476,153.004231452942 -27.475036949481,153.000755310059 -27.4722193630674,152.995433807373 -27.4706582368754,152.988739013672 -27.4654035520852,152.988309860229 -27.461595652945,152.987794876099 -27.4583207544854,152.985734939575 -27.4579399460257,152.986164093018 -27.4564928618847,152.988653182983 -27.4540556246159,152.98942565918 -27.4459057213361,152.996463775635 -27.4455248700075,152.997665405273 -27.4462865713499,152.99732208252 -27.4488763165743,152.999811172485 -27.4494856595558,153.001012802124 -27.4478099582569,153.000583648682 -27.4460580614994,153.001527786255 -27.4448393343027,153.004961013794 -27.4446108214545,153.009080886841 -27.4410307250398,153.010969161987 -27.440192813359,153.01251411438 -27.4421733216231,153.015089035034 -27.4417162844096,153.017749786377 -27.4405736830936,153.021183013916 -27.4423256669402,153.028049468994 -27.4443823081329,153.029508590698 -27.4435444219045,153.032255172729 -27.4449916759386,153.032855987549 -27.441944803253,153.03783416748 -27.4383646203335,153.038949966431 -27.4341748970835,153.041095733643 -27.4337940052648))

South Brisbane polygon:

POLYGON((152.86308288574 -27.580720462015,152.838363647461 -27.5788946026678,152.834243774414 -27.6585954639474,152.85209655762 -27.718788898838,152.87887573242 -27.785631542689,152.98873901367 -27.778949125104,153.079719543457 -27.7634564871653,153.22151184082 -27.8160009916616,153.263397216797 -27.9182834797361,153.34648132324 -27.907058371122,153.440895080566 -27.9061481761228,153.463897705078 -27.7309451582021,153.563804626465 -27.412004805752,153.425102233887 -27.3839620300855,153.336181640625 -27.4671551415181,153.29532623291 -27.5588081442964,153.28262329102 -27.535673730105,153.22288513184 -27.547241546253,153.19953918457 -27.5539381462411,153.1761932373 -27.558808144296,153.14254760742 -27.566112736347,153.132934570312 -27.5843720895287,153.116455078125 -27.5922835320307,153.086929321289 -27.602019908337,153.051223754883 -27.6068877721431,153.00315856934 -27.623315215692,152.99629211426 -27.648255880202,152.96882629395 -27.643389855465,152.92350769043 -27.612363860419,152.91801452637 -27.58802359546,152.86308288574 -27.580720462015))

Only inner Brisbane and Brisbane CBD should intersect, but all 5 are being returned

II think that INTERSECTS function does not depend strictly on the set of points you have, but on those of the minimum bounding rentangle (MBR) containing it.

From http://dev.mysql.com/doc/refman/5.0/en/relations-on-geometry-mbr.html

•MBRIntersects(g1,g2) Returns 1 or 0 to indicate whether the Minimum Bounding Rectangles of the two geometries g1 and g2 intersect.

From http://howto-use-mysql-spatial-ext.blogspot.com/ :

NOTE: The MySQL Spatial Documentation specifies that the Intersect function for every Geometry is approximated to the Intersect function of the bounding boxes of the involved geometries.

It seems you will get some false positives, but no false negatives, since the MBR is a superset of your Geometry.

Granted, I just looked this up. I hadn't even heard of this stuff ten minutes ago.