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