Reliable assessment of forest resource stock, productivity and harvesting is a commonly agreed objective of environmental monitoring programs. Distinctively, the assessment of wood harvesting has become even more relevant to evaluate the sustainability of forest management and to quantify forest carbon budget. This paper presents the development and testing of procedures for assessing forest harvesting in coppice forests by very high resolution (VHR) satellite imagery. The study area is located in central Italy over approximately 34,000 km 2 . A set of SPOT5 HRG multispectral images was acquired for the study years (2002)(2003)(2004)(2005)(2006)(2007). Official administrative statistics of coppice clearcuts were also acquired. More than 9500 clearcuts were mapped and dated by on-screen interpretation of the SPOT5 images. In a subset of the study area various methods for semi-automatic clearcut mapping were tested by pixel-and object-oriented approaches. The following results are presented: (i) clearcut map developed by visual interpretation of the SPOT5 images resulted in high thematic (overall accuracy of 0.99) and geometric (root mean square error of clearcut boundary delineation of 5.3 m) reliability; (ii) object-oriented approach achieved significantly better accuracy than pixel-based methods for semi-automatic classification of the coppice clearcuts; (iii) comparison between mapped clearcut area and official forest harvesting statistics proved a significant underestimation by the latter (65% of the total mapped clearcut area). A sample-based procedure exploiting VHR satellite imagery is finally proposed to correct the official statistics of coppice clearcuts.
IntroduzioneIl progetto per la realizzazione di una cartografia degli ambienti naturali e semi-naturali della regione Lazio è stato realizzato nell'ambito del bando di gara emanato dall'Agenzia Regionale dei Parchi del Lazio il 02/10/2006 per la realizzazione della "Carta delle formazioni naturali e seminaturali della Regione Lazio" in scala 1:10.000 assegnato a Telespazio SPA, ramo Osservazione della Terra (attualmente e-Geos S.p.A.), che si avvaleva, come supporto scientifico, della collaborazione con lo spin off dell'Università degli Studi del Molise Forestlab Centre s.r.l. e dei gruppi di ricerca del Laboratorio di Ecologia Vegetale dell'Università La Sapienza di Roma coordinato dal Prof. Carlo Blasi e dal gruppo del Prof. Piermaria Corona dell'Università della Tuscia.La carta si configura come un approfondimento fino al 6° livello tematico della Carta di Uso del Suolo della regione Lazio (CUS) realizzata nel 2003 in scala 1:25.000 (Regione Lazio 2003).In corso d'opera l'Area Foreste della Regione Lazio ha inoltre richiesto la derivazione di una carta fore- it). Abstract: Map of the natural and semi-natural environments and forest types map for the Latium region (Italy). The paper presents the main methodological aspects and the most important results achieved in the implementation of the "Map of natural and semi-natural environments" and of the "Forest types map" in Lazio region at a scale of 1:10.000. The project was carried out for the Agenzia dei Parchi and for the Area Foreste of Regione Lazio through a collaboration between e-GEOS , the University of Rome "La Sapienza", the University of Tuscia and Forestlab Centre , a spin-off of the University of Molise . The project is based on the integrated use of high-resolution satellite imagery and ADS40 false-color infrared digital orthophotos and led to the creation of two maps geometrically and thematically consistent with each other. The "Map of natural and semi-natural environments" is integrated with the pre-existing land use map of the Lazio region deepening the thematic detail up to the 6 th Corine level. The "Forest types map" is based on a typological system organized in 17 categories and 36 forest types .
Tropospheric ozone (O3) and Particulate Matter (PM) have become a major concern in mostEuropean cities. In particular, in Italy the O3 concentrations exceed the limits established for the protection ofboth human health and vegetation. More integrative studies are revealing that urban trees could concretelyhelp in improving air quality, not only because of their well known aesthetic and recreational benefit, but alsofor their capability to reduce air temperature and to remove air pollutants. This reduction takes place bothdirectly, by dry deposition to plant surfaces and uptake through stomata, and indirectly, by mitigation of theurban heat island intensity by canopy transpiration and building shading, that lowers the activity of chemicalreactions that led to the formation of photochemical pollutants in air. This is of particular importanceespecially for those cities located in the Mediterranean Basin, whose urban vegetation is often characterizedby VOC-emitting species that can contribute significantly to the O3 formation and destruction dynamics. Theaim of this paper is to present a short review of ecological research performed on vegetation of themetropolitan area of Rome, at different spatial and temporal scale, in order to evaluate the functional role ofurban green to monitor and improve urban air quality. In the frame of the project HEREPLUS (EU FP7), all ofthis information, opportunely integrated with climatic and pollutant data, will be implemented in a GIS and,by the use of geo-statistical methods, the ameliorating effect of urban vegetation will be quantified andmapped.
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