Search results for "Compositing"
showing 6 items of 6 documents
Comparison of cloud-reconstruction methods for time series of composite NDVI data
2010
Land cover change can be assessed from ground measurements or remotely sensed data. As regards remotely sensed data, such as NDVI (Normalized Difference Vegetation Index) parameter, the presence of atmospherically contaminated data in the time series introduces some noise that may blur the change analysis. Several methods have already been developed to reconstruct NDVI time series, although most methods have been dedicated to reconstruction of acquired time series, while publicly available databases are usually composited over time. This paper presents the IDR (iterative Interpolation for Data Reconstruction) method, a new method designed to approximate the upper envelope of the NDVI time s…
Multitemporal Mosaicing for Sentinel-3/FLEX Derived Level-2 Product Composites
2020
The increasing availability of remote sensing data raises important challenges in terms of operational data provision and spatial coverage for conducting global studies and analyses. In this regard, existing multitemporal mosaicing techniques are generally limited to producing spectral image composites without considering the particular features of higher-level biophysical and other derived products, such as those provided by the Sentinel-3 (S3) and Fluorescence Explorer (FLEX) tandem missions. To relieve these limitations, this article proposes a novel multitemporal mosaicing algorithm specially designed for operational S3-derived products and also studies its applicability within the FLEX…
Introducing the Time Series Change Visualization and Interpretation (TSCVI) method for the interpretation of global NDVI changes
2021
Abstract This paper presents a novel method for the visualization of changes in vegetation related variables. This method, termed Time Series Change Visualization and Interpretation (TSCVI), allows to summarize changes associated to both vegetation productivity and phenology in a single map. To that end, three metrics are retrieved on an annual basis from plotting NDVI (Normalized Difference Vegetation Index) values on a polar plot. Changes in these metrics are then analyzed and mapped in an IHS (Intensity Hue Saturation) image, where colors indicate changes regarding the growing-season (earlier or later occurrence, stronger or weaker seasonality), while changes associated to productivity a…
Stratifications, Graphems and Synchronies in (Neo-figurative) Cinema: From Greenaway’s The Tulse Luper Suitcases to Miller and Rodriguez’ Sin City
2009
Nel cinema postmoderno si vanno sempre più diffondendo modi di produzione tendenti a cancellare il set reale a favore di quello sintetico. Attraverso l'uso diffuso di sofisticati sistemi di Motion Capture abbinati a set virtuali e a operazioni di stratificazione dell’immagine che si avvalgono di processi di compositing si sta sempre più configurando un’estetica cinematografica “neofigurativa” che attinge al linguaggio dei fumetti. In questo contesto rinnovato le operazioni di “montaggio” non riguardano soltanto la costruzione temporale del film ma anche l'organizzazione spaziale all'interno di un singolo fotogramma. Si tratta di operazioni che esaltano sia la centralità della tecnica compos…
Sul neofigurativo cinematografico
2009
[...] L’uso della composizione digitale per creare spazi continui in cui interagiscono diversi elementi può essere considerato un esempio di estetica anti montaggio che contraddistingue il cinema neofigurativo. Mentre la logica del montaggio filmico tradizionale privilegia il montaggio temporale rispetto al montaggio interno ad una scena, la composizione li pone sullo stesso piano. La nuova logica dell’immagine digitale in movimento insita nell’operazione di compositing, per certi versi, va contro l’estetica di Ejzenstejn. La composizione digitale rende le dimensioni dello spazio e della cornice importanti quanto il tempo (non va dimenticato che lo spazio composito risulta dall’assemblaggio…
From aerial survey to representation and visualization: the Temple G of Selinunte
2022
The paper reports the outputs of a research work focused on the segmentation of meshes generated from aerial photogrammetric survey, aiming at the implementation of a database integrated in a web-based Information System developed with 3D-Hop technology, that uses models as the access point to information data. Segmentation is a relevant topic in cultural heritage documentation, since it is the a pre-requisite for the development of systems that connect information data to 3D models. The chosen case study is the Doric Temple G of Selinunte, an archaeological site in southern Sicily. Temple G, one of the biggest Doric Temples of Magna Graecia, it is today a huge heap of ruins, probably due t…