Dab tsi yog hom ntaub ntawv spatial hauv MySQL?
Dab tsi yog hom ntaub ntawv spatial hauv MySQL?

Video: Dab tsi yog hom ntaub ntawv spatial hauv MySQL?

Video: Dab tsi yog hom ntaub ntawv spatial hauv MySQL?
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Anonim

11.4.

MySQL muaj hom ntaub ntawv spatial uas sib xws rau cov chav kawm OpenGIS. Ib txhia hom ntaub ntawv spatial tuav ib qho geometry qhov tseem ceeb: GEOMETRY. POINT. LINESTRING

Ib yam li ntawd, MySQL spatial yog dab tsi?

Ua raws li OGC specification, MySQL siv qhov chaw extensions raws li ib tug subset ntawm SQL nrog Geometry Hom ib puag ncig. Lo lus no hais txog ib puag ncig SQL uas tau txuas ntxiv nrog cov txheej txheem geometry. Ib kem geometry-valued SQL yog siv raws li ib kem uas muaj hom geometry.

Tom qab, lo lus nug yog, MySQL cov ntaub ntawv hom yog dab tsi? MySQL txhawb SQL hom ntaub ntawv nyob rau hauv ob peb pawg: numeric hom , hnub thiab sijhawm hom , hlua (tus cim thiab byte) hom , spatial hom , thiab JSON hom ntaub ntawv.

Ib yam li ib tug yuav nug, dab tsi yog cov ntaub ntawv spatial?

1 Cov ntaub ntawv Spatial . Cov ntaub ntawv spatial suav nrog cov ntaub ntawv txheeb ze thaj chaw txog lub ntiaj teb thiab nws cov yam ntxwv. Ib khub ntawm latitude thiab longitude coordinates txhais ib qho chaw nyob hauv ntiaj teb. Cov ntaub ntawv spatial yog ob hom raws li cov txheej txheem khaws cia, uas yog, raster cov ntaub ntawv thiab vector cov ntaub ntawv.

Dab tsi yog cov ntaub ntawv spatial hauv GIS?

Kuj hu ua cov ntaub ntawv geospatial los yog geographic ntaub ntawv nws yog tus cov ntaub ntawv los yog cov ntaub ntawv uas txheeb xyuas thaj chaw ntawm cov yam ntxwv thiab thaj tsam ntawm lub ntiaj teb, xws li cov yam ntxwv ntawm ntuj los yog tsim, dej hiav txwv, thiab lwm yam. Cov ntaub ntawv spatial feem ntau yog khaws cia raws li kev tswj hwm thiab topology, thiab yog cov ntaub ntawv uas yuav tau mapped.

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