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I am a QGIS new user and I want to extract the buildings height of a territory. I clipped the raster with the LiDar informations with the buildings polygons; after I have extract the contours level inside each polygon.

Now I want to extract the maximum value (top of the roof) and the minimum value (base of the roof) and assign them to each polygon as attribute. How can I do it?

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    Do you have the unfiltered LiDAR information? Can you provide information regarding the LiDAR information you are using? Where was it sourced from? What have you tried?
    – Keagan Allan
    Commented Jan 25, 2018 at 9:19

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Use the Zonal Statistics built in plugin.

raster>zonal statistics>zonal statistics.

Select the raster with the height data, and the vector layer with the building information.

Zonal Statistics

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