Import cov ntaub ntawv los ntawm OpenStreetMap rau QGIS
Tus nqi ntawm cov ntaub ntawv hauv OpenStreetMap Yog tiag tiag sab, thiab txawm hais tias nws yog tsis siab tshiab, feem ntau nws yog ntau tshaj li cov ntaub ntawv txwm tsa ceg siv 1 nplaum los xij: 50,000.
Hauv QGIS nws yog qhov zoo los ntsaws no txheej ua daim keeb kwm yav dhau los xws li Google Earth duab, uas cov plugins twb muaj nyob, tab sis qhov no tsuas yog ib daim ntawv qhia keeb kwm yav dhau.
Yuav ua li cas yog tias koj xav kom muaj lub OpenStreetMap txheej ua ib qho vector?
1. Rub lub OSM database
Ua li no, koj yuav tsum xaiv qhov chaw uas koj xav tias yuav rub tawm cov ntaub ntawv. Nws yog pom tseeb tias thaj chaw loj heev, qhov twg muaj cov ntaub ntawv ntau, qhov loj ntawm cov ntaub ntawv yuav tsum loj thiab siv sijhawm. Ua li no, xaiv:
Vector> OpenStreetMap> Rub Tawm
Ntawm no koj xaiv txoj hauv kev uas xml file nrog .osm extension yuav rub tawm. Nws yog qhov ua tau los qhia txog plaub fab ntau ntawm ib txheej dhau los lossis los ntawm tam sim no cov khoom siv saib. Thaum xaiv tau tas txais, Lub txheej txheem ces pib thiab lub ntim ntawm cov ntaub ntawv downloaded yog tso tawm kom pom.
2. Tsim Cov Ntaub Ntawv
Thaum cov ntaub ntawv XML downloaded, nws yuav tsum hloov qhov no rau hauv ib lub database.
Qhov no yog ua tiav nrog: Vector> OpenStreetMap> Ntshuam topology ntawm XML ...
Ntawm no peb tau hais kom nkag mus rau qhov chaw, DB SpatiaLite tso tawm cov ntaub ntawv thiab yog tias peb xav tau qhov kev txuas kev txuas mus rau tsim tam sim ntawd.
3. Hu rau txheej QGIS
Hu cov ntaub ntawv ua ib txheej xav tau:
Vector> OpenStreetMap> Export topology rau SpatiaLite ...,
Nws yuav tsum raug qhia yog tias peb yuav tau hu tsuas yog cov ntsiab lus, kab lossis duab xwm kab. Kuj nrog khawm khawm los ntawm cov ntaub ntawv koj tuaj yeem teev uas yog cov khoom siv ntawm kev txaus siab.
Vim li ntawd, peb tuaj yeem thauj cov txheej mus rau peb daim ntawv qhia, raws li muaj nyob hauv daim duab nram qab no.
Tau kawg, vim hais tias OSM yog ib qho kev qhib lub hom phiaj, nws yuav siv sij hawm ntau rau cov cuab yeej ntiag tug ua qhov zoo tshaj plaws no.
