The DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material. http://http://dspace.unitus.it:80 2013-05-23T22:01:50Z 2013-05-23T22:01:50Z Corona, Piermaria Fattorini, Lorenzo Chirici, Gherardo Valentini, Riccardo Marchetti, Marco http://hdl.handle.net/2067/2136 2011-06-14T00:30:56Z 2006-12-31T23:00:00Z

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 Abstract: 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 repeatability Description: L'articolo è disponibile sul sito dell'editore http://www.springerlink.com/

2006-12-31T23:00:00Z Marchetti, Marco Bertani, Remo Corona, Piermaria Valentini, Riccardo http://hdl.handle.net/2067/2311 2012-08-06T23:05:35Z 2011-12-31T23:00:00Z

Title: Cambiamenti di copertura forestale e dell’uso del suolo nell’inventario dell’uso delle terre in Italia Authors: Marchetti, Marco; Bertani, Remo; Corona, Piermaria; Valentini, Riccardo Abstract: Changes of forest coverage and land uses as assessed by the inventory of land uses in Italy. The paper presents the IUTI program, a land use inventory of Italy, based on point sampling. It has been carried out to support the National Carbon Sink Accounting Register and it was realized within the framework of the Italian National Remote Sensing Plan managed by the Italian Ministry of Environment. IUTI has monitored the land use and land use change and forestry in the last two decades over the country at the years 1990, 2000, 2008, adopting a tessellated stratified sampling scheme with about 1.2 million sample points on aerial orthophotos. Following definitions, methods and inventory procedures, the main results are discussed. They show the heavy changes affecting surface and distribution of the various classes for arable lands, forests and urban areas. Description: L'articolo è disponibile sul sito dell'editore www.sisef.it

2011-12-31T23:00:00Z Corona, Piermaria Agrimi, Mariagrazia Baffetta, Federica Barbati, Anna Chiriacò, Maria Vincenza Fattorini, Lorenzo Pompei, Enrico Valentini, Riccardo Mattioli, Walter http://hdl.handle.net/2067/2316 2012-08-06T23:05:41Z 2011-12-31T23:00:00Z

Title: Extending large-scale forest inventories to assess urban forests Authors: Corona, Piermaria; Agrimi, Mariagrazia; Baffetta, Federica; Barbati, Anna; Chiriacò, Maria Vincenza; Fattorini, Lorenzo; Pompei, Enrico; Valentini, Riccardo; Mattioli, Walter Abstract: Urban areas are continuously expanding today, extending their influence on an increasingly large proportion of woods and trees located in or nearby urban and urbanizing areas, the socalled urban forests. Although these forests have the potential for significantly improving the quality the urban environment and the well-being of the urban population, data to quantify the extent and characteristics of urban forests are still lacking or fragmentary on a large scale. In this regard, an expansion of the domain of multipurpose forest inventories like National Forest Inventories (NFIs) towards urban forests would be required. To this end, it would be convenient to exploit the same sampling scheme applied in NFIs to assess the basic features of urban forests. This paper considers approximately unbiased estimators of abundance and coverage of urban forests, together with estimators of the corresponding variances, which can be achieved from the first phase of most largescale forest inventories. A simulation study is carried out in order to check the performance of the considered estimators under various situations involving the spatial distribution of the urban forests over the study area. An application is worked out on the data from the Italian NFI. Description: L'articolo è disponibile sul sito dell'editore www.springer.com

2011-12-31T23:00:00Z Corona, Piermaria Barbati, Anna Tomao, Antonio Bertani, Remo Valentini, Riccardo Marchetti, Marco Fattorini, Lorenzo Perugini, Lucia http://hdl.handle.net/2067/2346 2013-03-01T00:05:45Z 2011-12-31T23:00:00Z

Title: Land use inventory as framework for environmental accounting: an application in Italy Authors: Corona, Piermaria; Barbati, Anna; Tomao, Antonio; Bertani, Remo; Valentini, Riccardo; Marchetti, Marco; Fattorini, Lorenzo; Perugini, Lucia Abstract: Land use inventories are sound measures to provide information on the area occupied by different land use or land cover types and their changes, although less widespread than traditional mapping; as such, they are distinctively wellestablished tools for generating statistics on the state and the dynamics of land use in the European Union. Italy has recently set up a land use inventory system (IUTI) as a key instrument for accounting removals and emissions of greenhouse gases (GHG) associated to land use, land use change and forestry (LULUCF) activities elected by Italy under the Kyoto Protocol. IUTI adopts a statistical sampling procedure to estimate the area covered by LULUCF land use categories in Italy, and associated uncertainty estimates. Estimates of land use have been so far processed for the period 1990-2008 and highlight three interlinked land use change patterns in Italy: (i) increase in forest land for a total uptake of 1.7% of the Italian territory; forest cover estimates, with a standard error of 0.1%, indicate an annual increase of forestland higher over the period 1990-2000 (32 901 ha year-1) than in 2000-2008 (22 857 ha year-1); surprisingly, also a significant deforestation rate is observed (-7000 ha year-1), due to forest land conversion mainly into artificial areas; (ii) consumption of arable land (-4.2% of the Italian territory) primarily due to land uptake by urban areas and to conversions to permanent crops (mainly orchards and vineyards); (iii) urban sprawl uptakes 1.6% of the Italian territory in this period, with a total coverage of settlements reaching 7.1% of total land surface in Italy in 2008. Overall, land use dynamic results in land uptake by forest land is of the same magnitude of land uptake by urban areas, but the effects of these processes on GHG removals (by forest sinks) and emissions (by urban areas) is expected to be significantly different. In a broader perspective, IUTI methodology, by providing reliable estimates and well-defined levels of statistical uncertainty for assessing stocks and flows of land use at national level, can be further implemented to frame other key questions for sustainable development policies, like the set up of environmental-economic accounting systems. Description: L'articolo è disponibile sul sito dell'editore www.sisef.it

2011-12-31T23:00:00Z