Georeferenced cartography dataset of the La Fossa crater fumarolic field at Vulcano Island (Aeolian Archipelago, Italy): conversion and comparison of data from local to global positioning methods

The present study illustrates the procedures applied for the coordinate
system conversion of the historical fumarole positions at La Fossa crater,
to allow their comparison with newly acquired global positioning system
(GPS) data. Due to the absence of ground control points in the field and on
both the old Gauss Boaga and the new UTM WGS 1984 maps, we had to
model the transformation errors between the two systems using differential
GPS techniques. Once corrected, the maps show a residual Easting shifting,
due to erroneous georeferencing of the original base maps; this is corrected
by morphological comparative methods. The good correspondence between
the corrected positions of the historical data and the results of the new
GPS survey that was carried out in 2009 highlights the good quality of the
old surveys, although they were carried out without the use of accurate
topographical instruments.

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