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Title: Estimating forest area at the year 1990 by two-phase sampling on historical remotely sensed imagery in Italy
Authors: Corona, Piermaria
Fattorini, Lorenzo
Chirici, Gherardo
Valentini, Riccardo
Marchetti, Marco
Keywords: Forest area assessment;Point sampling and classification;Two-phase sampling ·;Unaligned systematic sampling
Issue Date: 2007
Publisher: Springer Verlag
Source: Corona, P. et al. 2007. Estimating forest area at the year 1990 by two-phase sampling on historical remotely sensed imagery in Italy. "Journal of Forest Research" 12: 8–13.
Forest area in the year 1990 is a fi gure of great
interest under the Kyoto Protocol. This note is devoted to
a scientifi c exercise for the probabilistic ex post assessment
of such a fi gure in Italy. Estimation was performed by twophase
point sampling, which made use of historical remotely
sensed imagery. In the fi rst phase, a sample of 12 089
points was selected according to an unaligned systematic
sampling and the selected points were classifi ed in land-use
categories by Landsat 5 TM imagery. In the second phase,
a sample of 3000 points was selected by stratifi ed sampling
in which the strata were determined by the satellite classifi
cation and the selected points were classifi ed by aerial
photos, assumed as ground truth. A two-phase estimate of
land-use coverage partitioning the Italian territory was
obtained together with a conservative estimate of the
sampling variance-covariance. The procedure has proved
to be of relatively easy implementation and objective
L'articolo è disponibile sul sito dell'editore
ISSN: 1341-6979
DOI: 10.1007/s10310-006-0239-2
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