How to calculate the area related to the volcanic ash in the field work?

12 December 2017 0 9K Report

When we produce the volcanic ash isopach map, it is easy to compute the area in the GIS. But previously, no GIS support, how to calculate the area related to the volcanic ash in the field work? Very old paper shows that the ash depth with relation to the area by the field survey, would you give me some details on this question? Thanks in advance.

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