Пересечение геометрии MySQL дает непересекающиеся результаты

У меня есть таблица почтовых индексов MySQL с геометрической площадью каждого из них, сохраненной в виде многоугольника. У меня также есть таблица региональных областей, которые также являются полигонами. Я делаю простой запрос, чтобы найти пересекающуюся область для определенного почтового индекса (т.е. найти, к какой области он принадлежит), но я получаю возвращаемые области, которые вообще не пересекаются.

Вот мой запрос:

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

Почему MySQL возвращает результаты, которые не пересекаются? Есть ли ошибка в моем запросе?

Вот полигон для почтового индекса 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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-27.4502,152.982155 -27.450125,152.982289 -27.450037,152.982385 -27.449979,152.982468 -27.449949,152.982619 -27.449909,152.98288 -27.449827,152.983179 -27.449698,152.98343 -27.449633,152.983578 -27.449604,152.983751 -27.449492,152.983805 -27.449433,152.983997 -27.449274,152.984193 -27.449089,152.984359 -27.448862,152.984442 -27.448741,152.984456 -27.448679,152.984436 -27.448634,152.984382 -27.448566,152.984328 -27.448511,152.984305 -27.448478,152.984297 -27.448448,152.984307 -27.448419,152.984355 -27.448348,152.984589 -27.448132,152.984716 -27.448001,152.984715 -27.447976,152.984799 -27.447851,152.984844 -27.44784,152.98498 -27.447629,152.985086 -27.447518,152.985194 -27.447451,152.985471 -27.447351,152.985536 -27.447314,152.985668 -27.44728,152.985872 -27.447289,152.986138 -27.447344,152.986305 -27.447423,152.986393 -27.447532,152.986464 -27.447672,152.986546 -27.447878,152.986737 -27.448173,152.986964 -27.448461,152.9871 -27.448586))

Полигон Южного Квинсленда:

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 -27.8852115779122,152.832183837891 -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))

Полигон Северного Брисбена:

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))

Внутренний полигон Брисбена:

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))

Полигон центрального делового района Брисбена:

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))

Полигон Южного Брисбена:

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))

Только внутренний Брисбен и центральный деловой район Брисбена должны пересекаться, но все 5 возвращаются.


person Matthew James Taylor    schedule 06.01.2011    source источник
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Возможно, ваши точки не добавляются в правильном порядке, поэтому полигон представляет собой беспорядок. Вероятно, было бы полезно иметь несколько проблемных.   -  person SilverbackNet    schedule 06.01.2011
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какова ваша функция пересечения? единственное пересечение, которое я знаю в SQL, - это пересечение в смысле теории множеств, ничего геометрически значимого   -  person jon_darkstar    schedule 06.01.2011
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@jon_darkstar... сначала я тоже так подумал, но, видимо, у mysql есть пространственные расширения: howto-use-mysql-spatial-ext.blogspot.com ... круто, да?   -  person Gerrat    schedule 06.01.2011
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прикольно, никогда о таком не слышал. из быстрого исследования кажется, что сравнения пересечений (и большинство других) основаны на минимальном прямоугольнике, ограничивающем точки рассматриваемых геометрий. Таким образом, в зависимости от формы, эти прямоугольники могут быть значительно больше, чем предполагалось на самом деле.   -  person jon_darkstar    schedule 06.01.2011
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Хорошо, я добавил данные полигона. Надеюсь, это поможет   -  person Matthew James Taylor    schedule 06.01.2011
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@Matt - если вы можете поделиться точками из множества проблемных областей, тогда мы сможем увидеть, не заключается ли проблема в том, что ограничивающие рамки пересекаются, когда сами точки не пересекаются.   -  person jon_darkstar    schedule 06.01.2011


Ответы (1)


Я думаю, что функция INTERSECTS зависит строго не от набора точек, которые у вас есть, а от точек минимального ограничивающего угла (MBR), содержащего ее.

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

• MBRIntersects(g1,g2) Возвращает 1 или 0, чтобы указать, пересекаются ли минимальные ограничивающие прямоугольники двух геометрий g1 и g2.

Из http://howto-use-mysql-spatial-ext.blogspot.com/< /а> :

ПРИМЕЧАНИЕ. В пространственной документации MySQL указано, что функция пересечения для каждой геометрии аппроксимируется функцией пересечения ограничивающих рамок вовлеченных геометрий.

Кажется, вы получите несколько ложных срабатываний, но не ложных отрицаний, поскольку MBR является надмножеством вашей геометрии.

Правда, я только что посмотрел это. Я даже не слышал об этом десять минут назад.

person jon_darkstar    schedule 06.01.2011
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Ненавижу это говорить, но я думаю, что вы правы. MBR действительно пересекается для всех вышеперечисленных полигонов. - person Matthew James Taylor; 06.01.2011
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да я не знаю, как это сделать лучше. я думаю, вы только что достигли пределов того, что можно сделать в базе данных. Честно говоря, я был удивлен, что ты можешь так много сделать. возьмите данные и сделайте что-нибудь в коде приложения, я думаю - person jon_darkstar; 06.01.2011