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Dépouillements

Effect of Jpeg2000 on the information and geometry content of aerial photo compression / J.K. Liu in Photogrammetric Engineering & Remote Sensing, PERS, vol 71 n° 2 (February 2005)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 71 n° 2 (February 2005) . - pp 157 - 167 Titre : Effect of Jpeg2000 on the information and geometry content of aerial photo compression Type de document : Article/Communication Auteurs : J.K. Liu, Auteur ; H.C. Wu, Auteur ; T.Y. Shih, Auteur Année de publication : 2005 Article en page(s) : pp 157 - 167 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] compression d'image [Termes IGN] compression par ondelettes [Termes IGN] contrôle qualité [Termes IGN] erreur moyenne quadratique [Termes IGN] format JPEG [Termes IGN] image aérienne [Termes IGN] point de repère [Termes IGN] qualité des données [Termes IGN] qualité géométrique (image) [Termes IGN] qualité radiométrique (image) [Termes IGN] rapport signal sur bruit [Termes IGN] transformation en cosinus discrète Résumé : (Auteur) The standardization effort of the next ISO standard for compression of the still image, JPEG2000, has recently reached International Standard (IS) status. This wavelet-based standard outperforms the Discrete Cosine Transform (DCT) based JPEG in terms of compression ratio, as well as, quality. In this study, the performance of JPEG2000 is evaluated for aerial image compressions. Different compression ratios are applied to scanned aerial photos at the 1:5 000 scale. Both the image quality measurements and the accuracy of photogrammetric point determination aspects are examined. The evaluation of image quality is based on visual analysis of the objects in the scene and on the computation of numerical indices, including RMSE, entropy, and Peak Signal-to-Noise Ratio (PSNR). The geometric quality of JPEG2000 with different compression ratios is studied for some photogrammetric operations, including interior orientation, relative orientation, absolute orientation, and DSM generation. The objective of this study is to explore the possibility of JPEG2000 for replacing JPEG as a standard in photogrammetric operations. Numéro de notice : A2005-029 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.71.2.157 En ligne : https://doi.org/10.14358/PERS.71.2.157 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27167 [article]

A least squares-based method for adjusting the boundaries of area objects / X. Tong-Tong in Photogrammetric Engineering & Remote Sensing, PERS, vol 71 n° 2 (February 2005)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 71 n° 2 (February 2005) . - pp 189 - 195 Titre : A least squares-based method for adjusting the boundaries of area objects Type de document : Article/Communication Auteurs : X. Tong-Tong, Auteur ; Wei Shi, Auteur ; D. Liu, Auteur Année de publication : 2005 Article en page(s) : pp 189 - 195 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] cadastre étranger [Termes IGN] cohérence géométrique [Termes IGN] implémentation (informatique) [Termes IGN] limite indéterminée [Termes IGN] méthode des moindres carrés [Termes IGN] objet géographique zonal [Termes IGN] parcelle cadastrale [Termes IGN] précision géométrique (imagerie) [Termes IGN] Shanghai (Chine) [Termes IGN] système d'information géographique Résumé : (Auteur) In this paper a least squares-based method is proposed for adjusting the boundaries of area objects in a GIS that is designed particularly for solving inconsistencies between the areas of digitized and registered land parcels. The principle of this approach is taking the size of the registered area of a land parcel as its true value and to adjust the geometric position of the boundaries of the digitized parcel. First, a generic area adjustment model is derived by incorporating the following two categories of constraints: (a) attribute constraint: the size of the true area of the parcel, and (b) geometric constraints: such as, straight lines, right angles and certain distances. Second, the methods used to adjust the areas of the parcels for different cases are presented. Third, the implementation of the proposed model is illustrated using several case studies. The results of the application and the corresponding analysis demonstrate that the proposed approach is able to maintain a consistency between the areas of the digitized and registered parcels. This study has solved one of the most critical problems in developing a land/cadastral information system, and this solution has been adopted in the processing of real world cadastral data in Shanghai and other cities in China. Numéro de notice : A2005-030 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.71.2.189 En ligne : https://doi.org/10.14358/PERS.71.2.189 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27168 [article]

A least squares adjustment of multi-temporal INSAR data: application to the ground deformation of Paris / S. Le Mouelic in Photogrammetric Engineering & Remote Sensing, PERS, vol 71 n° 2 (February 2005)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 71 n° 2 (February 2005) . - pp 197 - 204 Titre : A least squares adjustment of multi-temporal INSAR data: application to the ground deformation of Paris Type de document : Article/Communication Auteurs : S. Le Mouelic, Auteur ; Daniel Raucoules, Auteur ; C. Carnec, Auteur ; Christine King, Auteur Année de publication : 2005 Article en page(s) : pp 197 - 204 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] compensation par moindres carrés [Termes IGN] déformation verticale de la croute terrestre [Termes IGN] filtrage du rayonnement [Termes IGN] image multitemporelle [Termes IGN] image radar moirée [Termes IGN] mouvement de terrain [Termes IGN] Paris (75) [Termes IGN] précision millimétrique [Termes IGN] réfraction atmosphérique [Termes IGN] subsidence Résumé : (Auteur) Satellite radar interferometry can be used to spatially monitor small vertical ground deformations. When millimeter accuracy is required, the differential interferometry technique is hampered by the ambiguity with atmospheric artifacts. It is also often difficult to obtain a precise evaluation of the kinematic evolution of ground deformations from a set of time, randomly distributed interferograms. We present the results of a least-squares approach coupled with a temporal filtering and applied to a large data set over the City of Paris. The mean deformation rate and a map of areas affected by time, non-linear deformation events are presented. We show that this approach, which provides a chronologically ordered set of phase screens, allows the retrieval of the kinematic Parameters of ground deformations as low as 1 to 2 mm per year. Subsiding areas have been detected, and their evolution in time has been quantified. Such an approach can be useful to fully characterize the kinematic evolution of ground deformations in major cities or desertic areas where large areas have a high degree of coherence and where millimeter accuracy is often required. Numéro de notice : A2005-031 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.71.2.197 En ligne : https://doi.org/10.14358/PERS.71.2.197 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27169 [article]

Multidimensional management of geospatial data quality information for its dynamic use within GIS / Rodolphe Devillers in Photogrammetric Engineering & Remote Sensing, PERS, vol 71 n° 2 (February 2005)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 71 n° 2 (February 2005) . - pp 205 - 215 Titre : Multidimensional management of geospatial data quality information for its dynamic use within GIS Type de document : Article/Communication Auteurs : Rodolphe Devillers, Auteur ; Robert Jeansoulin, Auteur ; Yvan Bédard, Auteur Année de publication : 2005 Article en page(s) : pp 205 - 215 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Infrastructure de données [Termes IGN] base de données multi-représentation [Termes IGN] données localisées 3D [Termes IGN] interactivité [Termes IGN] métadonnées [Termes IGN] métadonnées géographiques [Termes IGN] qualité des données [Termes IGN] SOLAP [Termes IGN] système d'information géographique [Termes IGN] utilisateur Résumé : (Auteur) Metadata should help users to assess the quality (fitness for use) of geospatial data, thus reducing the risk of data misuse. However, metadata presents limitations and remain largely unused. There still exists a need to provide information to users about data quality in a more meaningful way. This research aims to dynamically communicate quality information to the users in a rapid and intuitive way in order to reduce user meta- uncertainty related to geospatial data quality, and then reduce the risks of data misuses. Such a solution requires a data model able to support heterogeneous data quality information at different levels of analysis. Using a multidimensional database approach, this paper proposes a conceptual framework named the Quality Information Management Model (QIMM) relying on quality dimensions and measures. This allows a user to easily and rapidly navigate into the quality information using a Spatial On-Line Analytical Processing (SOLAP) client-tied to its GIS application. QIMM potential is illustrated by examples, and then a prototype and ways to communicate data quality to users are explored. Numéro de notice : A2005-032 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.14358/PERS.71.2.205 En ligne : https://doi.org/10.14358/PERS.71.2.205 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27170 [article]