Use of multi-angle high-resolution imagery and 3D information for urban land-cover classification: a case study on Istanbul

The BELSPO-MAMUD project focuses on the use of Remote Sensing data for measuring and modelling urban dynamics. Remote sensing is a wonderful tool to produce long time-series of high resolution maps of sealed surface useful for this purpose. In the urban context of Istanbul, a very dynamic city, recent high resolution satellite images and medium resolution images from the past have been exploited to calibrate and validate a regression-based sub-pixel classification method allowing this production. In this context it’s a tricky task for several reasons: prominent occurrence of shadowed and occluded areas and urban canyons, spectral confusions between urban and non-urban materials at ground and roof levels, moderately hilly relief ... To cope with these difficulties the combined use of three types of data may be helpful: diachronic (i), multi-angle and 3D data. A master multispectral and panchromatic QuickBird image and a panchromatic Ikonos stereopair, all acquired in March 2002, were used in combination with a multispectral and panchromatic Ikonos image of May 2005. A DSM was generated from the Ikonos stereopair and building vector file. It was used for orthorectification, building height estimation and classification procedure. The area covered by the high resolution products was divided in 3 partitions and each one was classified independently. This application demonstrates that recent high resolution land-cover classification produced using multi-date, multi-angle and DSM can be used to produce sealed surface maps from longer timeseries of medium resolution images over large urban areas enabling so the analysis of urban dynamics

Spatial aggregation of low resolution satellite data for the monitoring of vegetation response to climatic stresses : analysis of the spatial heterogeneity of aggregated entities.

peer reviewedOur PhD research consists in analysing and modelling the vegetation response or sensitivity to climatic stresses with low satellite imagery. In that framework, the selection of optimal calibration sites is very important. These sites should be characterised by a stable and homogenous land cover over large area. Here we analyse the spatial heterogeneity of the aggregation entities (EU-NUTS 2) used by the MARSFOOD programme for the extraction of regional NDVI-means

Capping layer effects in the structure and composition of Co nanoparticle ultrathin films

In this work, we present the correlation of the magnetic and structural properties of Co nanoparticles deposited by sputtering on Si3N4 substrates at different temperatures, and covered with different capping layers, two insulators, AlN and MgO, and a metal, Pt. High-resolution transmission electron microscopy shows the formation of CoPt3 and Co2N, for the Pt and AlN capping layers, respectively, giving to a significant change of the magnetic behavior. When using a cap of MgO, energy-filtered transmission electron microscopy shows an oxidized shell covering the Co nanoparticles with thickness decreasing as the deposition temperature increases, explaining the changes in the magnetic response induced by the MgO capping layer.This work has been funded by the Spanish Project No.MAT2002-04484-C03-02. Y.H. acknowledges the Consejo Superior de Investigaciones Científicas CSIC and Ramón y Cajal Program for financial support.Peer reviewe

AUTOMATISATION DE LA DÉTECTION DES CRATÈRES LUNAIRES SUR DES IMAGES ET MNT PLANÉTAIRES

peer reviewedCette recherche s’inscrit dans la préparation d’une mission lunaire. Elle a pour objectif d’implémenter, tester et valider une méthode automatique qui détecte les cratères à la surface lunaire à partir de produits planétaires (images et MNT). Dans un tel contexte, l’automatisation du processus est essentielle étant donné que les cratères représentent un risque d’alunissage et des points de repère pour la navigation visuelle. L’automatisation constitue le défi majeur des méthodes de détection car il est difficile de développer des traitements automatiques de haut niveau comparables à la réflexion réalisée lors d’une interprétation visuelle traditionnelle. Notre méthode établit de manière automatique un diagnostic sémantique sur base de la combinaison de plusieurs descripteurs calculés sur les produits planétaires utilisés. Enfin, cette application s’intègre dans un outil d’aide à la décision et d’estimation du risque d’alunissage et de survie d’une mission. Elle a aussi pour but d’alimenter une base de données de points de repère pour la navigation visuelle automatique d’un engin spatial en phase d’alunissage.This research is part of the preparation of a lunar mission. Its objective is to implement, test and validate an automated method that detects craters on the lunar surface from planetary products (images and DTM). In this context, the automation of the process is essential because the craters represent a landing risk and landmarks for visual navigation. It is also the key challenge because it is difficult to develop high level automatic processing comparable to the thinking carried out in a traditional visual interpretation. Our method automatically establishes a semantic diagnosis based on the combination of crater descriptors computed on the planetary products used. Finally, this application is part of a decision support tool and an assessment system of landing and mission survival risks. It also aims to feed a landmarks database for automatic visual navigation of a lunar landing spacecraft.LandSAf

A web application for browsing a folk music collection

V diplomski nalogi je predstavljena realizacija spletne aplikacije, ki uporabniku omogoča pregled zbirke ljudske glasbe in iskanje po njej. Razvili smo idejo in jo implementirali v programskem jeziku C#. Uporabili smo ogrodje .NET, arhitekturo MVC5, strežnik MSSQL in iskalni strežnik Elasticsearch. Spletna aplikacija omogoča splošno iskanje ljudske glasbe in iskanje z uporabo filtrov. Za iskanje s filtri smo uporabili Googlov pristop pametnega iskanja. Možen je tudi vnos melodije preko tekstovnega polja ali z uporabo klaviature in tudi iskanje po melodiji. Zaradi uporabe Elasticsearch strežnika sta iskanje in prikaz rezultatov hitra. Omogočen je tudi prikaz notnega zapisa, PDF datotek ter predvajanje avdio in MIDI datotek posameznih pesmi.The thesis presents the realization of a web application that allows the user to review a folk music collection and search within it. We developed the idea and implemented it using C# programming language. We used the .NET framework, MVC5 architecture, MSSQL server and Elasticsearch search server. The Web application provides general searching of folk music and searching with the help of filters. We used Google’s smart search approach for searching with the filters. We can enter a melody in the text field or use the keyboard to search by melody. Searching and displaying of results are fast, due to the use of the Elasticsearch server. The application also shows musical notations, PDF-files and can play audio and MIDI files

保险代理手续费监管制度思考

本文应用博弈论的方法,基于保险代理手续费率市场化的发展趋势,分析了我国保险市场的发展现状与特点,回顾了我国保险代理手续费监管制度的发展过程和存在问题,指出目前在我国推行手续费率市场化的监管政策可能引发"手续费率资源化"问题,并就保险代理手续费市场化应建立在保险费率市场化方面提出政策建议

As esculturas cokwe como respostas às assimetrias civilizacionais

Fundada em 1917, a Companhia de Diamantes de Angola (Diamang) ocupava uma vasta região da Lunda Norte e Lunda Sul. Além das ações voltadas para a exploração de diamantes, essa empresa concessionária constituiu em 1936 o Museu do Dundo, um espaço destinado a colecionar objetos relacionados, sobretudo, aos povos que habitavam a sua área de atuação. Os objetivos cada vez mais ambiciosos e o receio da extinção de uma arte reminiscente do “tempo tribal” levaram o Museu do Dundo a organizar não apenas expedições de recolhas de objetos, mas também a contratar e manter “protegidos” em seus domínios escultores de madeira e de marfim a fim de evitar que as transformações ocasionadas pela situação colonial influenciassem os trabalhos desses homens. Este artigo tem como objetivo apresentar algumas reflexões sobre como os anseios fictícios do Museu em relação a esses escultores foram fundamentais para compreender as constantes tensões e dificuldades em enquadrar em seu espaço não apenas esses próprios homens, mas também as suas produções.The Companhia de Diamantes de Angola (Diamang) was founded in 1917 and occupied a vast region of Lunda’s north and south areas. Aside from the activities around diamond mining this concessionary company also created a museum in 1936. The Museu do Dundo (Dundo Museum) was a space dedicated to collect objects related to the inhabitants who lived in the area exploited by the company. The increasingly ambitious objectives of the Museum and the concern regarding the disappearance of a reminiscent art from “tribal times” resulted not only in the organization of collecting expeditions but also in the recruitment and “protection” of wood and ivory sculptors inside the company’s domains to avoid that their work were influenced by changes caused by the colonialism. The main objective of this paper is to present some considerations regarding how the museum’s fictitious expectations regarding these sculptors were crucial to understand the continuous tensions and difficulties faced to accommodate not only these men but also their work in its space

BepiColombo Science Investigations During Cruise and Flybys at the Earth, Venus and Mercury

The dual spacecraft mission BepiColombo is the first joint mission between the European Space Agency (ESA) and the Japanese Aerospace Exploration Agency (JAXA) to explore the planet Mercury. BepiColombo was launched from Kourou (French Guiana) on October 20th, 2018, in its packed configuration including two spacecraft, a transfer module, and a sunshield. BepiColombo cruise trajectory is a long journey into the inner heliosphere, and it includes one flyby of the Earth (in April 2020), two of Venus (in October 2020 and August 2021), and six of Mercury (starting from 2021), before orbit insertion in December 2025. A big part of the mission instruments will be fully operational during the mission cruise phase, allowing unprecedented investigation of the different environments that will encounter during the 7-years long cruise. The present paper reviews all the planetary flybys and some interesting cruise configurations. Additional scientific research that will emerge in the coming years is also discussed, including the instruments that can contribute