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st_union for joining overlapped areas

Discussion in 'Geography' started by Zen, Oct 8, 2018.

  1. Zen

    Zen Guest

    I have two land use maps for London which have an overlapped area. Can I use the st_union function in postgis to join them together? [​IMG]

    The attribute table contains information includes legends and building heights.[​IMG] Will this method affect my features? For example, in the overlapped area, will the build heights become 2 times of the original? Data from postgres have the same columns and same type of data. [​IMG]

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