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eshould______thedataset①highlight②rightclick√③leftclick
Chapter2Coordi
ateSystems
PartⅠ：Expla
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s：Projecti
gfromthesphericalshapeoftheEarthtothepla
arshapeofthemapPartⅡ：ShortA
swer1Whyisthedatumimporta
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GIS大地基准在GIS中的重要性何在？Adatumisimporta
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解释地图投影的重要性Amapprojectio
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