An uprooted tree can be safe when lying on the ground, but it can become a hazard if someone attempts to cut it. The heavy roots, stump and stem contain dangerous crushing force. Special techniques and training are required to cut up-rooted trees safely.
This 21-page manual focuses on cutting leaning, uprooted, or broken trees and is for the experienced chainsaw user. Up-rooted trees are covered on pages 3-9 according to the PDF (page numbers differ from the original booklet).