Problem to be solved: to provide an excavation support system which is very practicable.In excavation work at civil engineering worksA subject 1, which is disposed at a known coordinate point provided in the area R of excavation and can be distinguished from each other, andA photographing means 2 for photographing the object 1 and its surroundingsThe shape specifying means 3 for specifying the shape of the area R of the excavation breakthrough from the image acquired by the photographing means andThe shape and position of the area R of excavation following obtained by the shape specifying means 3 are compared with the previously designed design and position.This method is provided with a comparison detecting means for detecting the degree of excess of excavation.Diagram
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