Estimating forest area at the year 1990 by two-phase sampling on historical remotely sensed imagery in Italy |
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| Authors: | Piermaria Corona Lorenzo Fattorini Gherardo Chirici Riccardo Valentini Marco Marchetti |
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| Institution: | (1) Dipartimento di Scienze dell'Ambiente Forestale e delle sue Risorse, Università della Tuscia, Via S. Camillo de Lellis, Viterbo, 01100, Italy;(2) Dipartimento di Metodi Quantitativi, Università di Siena, Siena, Italy;(3) Dipartimento di Scienze e Tecnologie Ambientali Forestali, Università di Firenze, Firenze, Italy;(4) Dipartimento di Scienze e Tecnologie per l'Ambiente e il Territorio, Università del Molise, Iserma, Italy |
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| Abstract: | Forest area in the year 1990 is a figure of great interest under the Kyoto Protocol. This note is devoted to a scientific
exercise for the probabilistic ex post assessment of such a figure in Italy. Estimation was performed by two-phase point sampling,
which made use of historical remotely sensed imagery. In the first phase, a sample of 12 089 points was selected according
to an unaligned systematic sampling and the selected points were classified in land-use categories by Landsat 5 TM imagery.
In the second phase, a sample of 3000 points was selected by stratified sampling in which the strata were determined by the
satellite classification and the selected points were classified 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 repeatability. |
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| Keywords: | Forest area assessment Point sampling and classification Two-phase sampling Unaligned systematic sampling |
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