Video: Dab tsi yog hom ntaub ntawv spatial hauv MySQL?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
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.
Pom zoo:
Dab tsi yog qhov txawv ntawm daim ntawv qhia lub hom phiaj thiab daim ntawv qhia lub hom phiaj tshwj xeeb?
Qhov tseem ceeb hauv daim ntawv qhia dav dav yog nyob ntawm qhov chaw. Phab ntsa daim duab qhia chaw, feem ntau daim ntawv qhia pom nyob rau hauv atlases, thiab txoj kev maps yog tag nrho cov nyob rau hauv qeb no. Thematic maps, tseem hu ua daim ntawv qhia tshwj xeeb, qhia txog thaj chaw faib khoom ntawm ib lub ntsiab lus lossis qhov tshwm sim
Txoj kev faib cov ntaub ntawv twg muab cov ntaub ntawv sib npaug ntawm cov ntaub ntawv lossis cov kev tshuaj xyuas hauv txhua chav kawm cov ntaub ntawv?
Quantile. txhua chav kawm muaj cov yam ntxwv sib npaug. Ib qho kev faib tawm ntau yog zoo haum rau cov ntaub ntawv faib tawm. Quantile muab tib tus lej ntawm cov ntaub ntawv muaj nuj nqis rau txhua chav kawm
Cov yam ntxwv ntawm cov ntaub ntawv twg yog qhov ntsuas ntawm tus nqi uas cov ntaub ntawv muaj nuj nqis heev?
Variation: Ib qho kev ntsuas ntawm tus nqi uas cov ntaub ntawv muaj nuj nqis sib txawv. ? Kev faib tawm: Cov xwm txheej lossis cov duab ntawm kev sib kis ntawm cov ntaub ntawv hla ntau qhov tseem ceeb (xws li tswb-puab). ? Outliers: Cov qauv piv txwv uas nyob deb heev ntawm feem ntau ntawm lwm cov qauv nqi
Thaum muab piv cov qauv sau rau ib tus neeg raug liam cov ntaub ntawv lub hnub nyoog sib txawv ntawm cov ntaub ntawv yuav tsum tsis pub tshaj kaum ob lub hlis?
Thaum piv cov qauv sau rau tus neeg raug liam? cov ntaub ntawv, lub hnub nyoog sib txawv ntawm cov ntaub ntawv yuav tsum tsis pub ntau tshaj rau rau kaum ob lub hlis. Tus lej txaus ntawm tus qauv yog qhov tseem ceeb rau kev txiav txim siab qhov tshwm sim ntawm kev sib piv
Dab tsi yog cov cuab yeej lossis cov ntaub ntawv uas tus Kws Tshawb Fawb xav tau los txheeb xyuas cov ntaub ntawv nug?
Cov ntaub ntawv raug nug hauv chav kuaj ua txhaum cai yog nruab nrog lub tshuab ntsuas ntsuas, ntsuas cov duab digital, infrared thiab ultraviolet lub teeb ci, cov cuab yeej tshuaj ntsuam video thiab cov cuab yeej tshwj xeeb suav nrog cov khoom siv hluav taws xob tshawb pom electrostatic (EDD) thiab cov khoom siv los ua chemistry