Aerial assessment of landscape net change by means of two-phase network sampling: an application to central Italy
Author(s)
Corona, Piermaria
Fattorini, Lorenzo
Pompei, Enrico
Date Issued
2007
Type
Article
Abstract
A design-based procedure for estimating the land cover net change between two dates in time is considered by
means of aerial information. The aerial information in the first date consists of analogical photos while the aerial
information in the second date consists of digital photos or satellite imagery. In the first phase of sampling a set of
points is selected on the study area by means of unaligned systematic sampling. The digital imagery available for
the second date may be readily adopted for spotting and classifying the first-phase points, thus obtaining a firstphase
estimator of the areal extents in the second date. On the other hand, owing to the operational difficulties of
spotting all the first-phase points on the analogical photos, a second-phase sample selected from these points is
necessary to estimate the areal extents of the land categories in the first date. Finally, the land cover net changes
may be estimated by means of the difference between the resulting estimates in the two dates. The use of stratified
network sampling is considered in the second phase in order to handle the presence of analogical photos
overlapping each other at their boundaries. An application of the procedure is considered for assessing the land
cover net change in the Abruzzo Region (Central Italy) between the years 1954 and 2002.
Additional information
L'articolo è disponibile sul sito dell'editore www.interscience.wiley.com
Citation
Corona, P., Fattorini, L., Pompei, E. 2007. Aerial assessment of landscape net change by means of two-phase network sampling: an application to central Italy. "Environmetrics" 18: 205–215
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