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A query integrity assurance scheme for accessing outsourced spatial databases / W. Ku in Geoinformatica, vol 17 n° 1 (January 2013)  

Public [article]  inGeoinformatica > vol 17 n° 1 (January 2013) . - pp 97 - 124 Titre : A query integrity assurance scheme for accessing outsourced spatial databases Type de document : Article/Communication Auteurs : W. Ku, Auteur ; L. Hu, Auteur ; et al., Auteur Année de publication : 2013 Article en page(s) : pp 97 - 124 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] base de données localisées [Termes IGN] courbe de Hilbert [Termes IGN] cryptage [Termes IGN] externalisation [Termes IGN] intégrité des données [Termes IGN] plus proche voisin, algorithme du [Termes IGN] protection de la vie privée Résumé : (Auteur) With the trend of cloud computing, outsourcing databases to third party service providers is becoming a common practice for data owners to decrease the cost of managing and maintaining databases in-house. In conjunction, due to the popularity of location-based-services (LBS), the need for spatial data (e.g., gazetteers, vector data) is increasing dramatically. Consequently, there is a noticeably new tendency of outsourcing spatial datasets by data collectors. Two main challenges with outsourcing datasets are to keep the data private (from the data provider) and to ensure the integrity of the query result (for the clients). Unfortunately, most of the techniques proposed for privacy and integrity do not extend to spatial data in a straightforward manner. Hence, recent studies proposed various techniques to support either privacy or integrity (but not both) on spatial datasets. In this paper, for the first time, we propose a technique that can ensure both privacy and integrity for outsourced spatial data. In particular, we first use a one-way spatial transformation method based on Hilbert curves, which encrypts the spatial data before outsourcing and, hence, ensures its privacy. Next, by probabilistically replicating a portion of the data and encrypting it with a different encryption key, we devise a technique for the client to audit the trustworthiness of the query results. We show the applicability of our approach for both k-nearest-neighbor queries and spatial range queries, which are the building blocks of any LBS application. We also design solutions to guarantee the freshness of outsourced spatial databases. Finally, we evaluate the validity and performance of our algorithms with security analyses and extensive simulations. Numéro de notice : A2013-048 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1007/s10707-012-0156-9 Date de publication en ligne : 15/03/2012 En ligne : https://doi.org/10.1007/s10707-012-0156-9 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32186 [article]

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
057-2013011	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Absolute radiometric calibration of Earth radiation measurement on FY-3B and its comparison with CERES-Aqua data / H. Qiu in IEEE Transactions on geoscience and remote sensing, vol 50 n° 12 (December 2012)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 50 n° 12 (December 2012) . - pp 4965 - 4974 Titre : Absolute radiometric calibration of Earth radiation measurement on FY-3B and its comparison with CERES-Aqua data Type de document : Article/Communication Auteurs : H. Qiu, Auteur ; L. Hu, Auteur ; Y. Zhang, Auteur ; et al., Auteur Année de publication : 2012 Article en page(s) : pp 4965 - 4974 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] analyse comparative [Termes IGN] étalonnage radiométrique [Termes IGN] image Aqua [Termes IGN] image Aqua-CERES [Termes IGN] image Feng-Yun [Termes IGN] rayonnement terrestre Résumé : (Auteur) The Earth Radiation Measurement (ERM) instrument onboard FengYun (FY)-3B satellite observes the Earth's atmosphere through a narrow scanning field of view (NFOV) and a wide nonscanning FOV. For each field of view, the measurements are made from two broadband channels: a total waveband channel covering 0.2-50 um and a shortwave (SW) band covering 0.2-4.3 um. The validation to the ERM calibration was carried out by comparing the unfiltered longwave (LW) and SW radiances from ERM with those from Clouds and Earth's Radiation Energy System (CERES) flight model 3 onboard Earth Observing System Aqua satellite. While the ERM LW and SW radiances have a good correlation with CERES data, there is a systemic bias between the two data sets. A spectral correction is made for the ERM data using the CERES data. After the correction, the error of the ERM LW radiance is reduced from -3.00 to -0.60 W/sr · m2. For the SW radiance, the bias is reduced from 6.00 to 4.00 W/sr · m2. Based on the ERM in-orbit calibration data, the stability of the ERM LW radiometric response is analyzed, and it is shown that the gains are stable with a variation of less than 1.5% during its first 9 months in orbit. However, the gains at the SW channels have larger changes and exceed 3%. These drifts might be caused by the detector degradation. Also, the NFOV scanner at the SW channel is no longer working after its 8 months in orbit. Numéro de notice : A2012-648 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2012.2202668 Date de publication en ligne : 16/07/2012 En ligne : https://doi.org/10.1109/TGRS.2012.2202668 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32094 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
065-2012121	RAB	Revue	Centre de documentation	En réserve L003	Disponible