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A comparison of error metrics and constraints for multiple endmember spectral analysis and spectral angle mapper / P.E. Dennison in Remote sensing of environment, vol 93 n° 3 (15/11/2004)
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Titre : A comparison of error metrics and constraints for multiple endmember spectral analysis and spectral angle mapper Type de document : Article/Communication Auteurs : P.E. Dennison, Auteur ; K. Halligan, Auteur ; D.A. Roberts, Auteur Année de publication : 2004 Article en page(s) : pp 359 - 367 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] albedo
[Termes IGN] analyse comparative
[Termes IGN] analyse de mélange spectral d’extrémités multiples
[Termes IGN] appariement spectral
[Termes IGN] calcul d'erreur
[Termes IGN] classe d'objets
[Termes IGN] classification Spectral angle mapper
[Termes IGN] erreur moyenne quadratique
[Termes IGN] métriqueRésumé : (Auteur) Spectral matching algorithms can be used for the identification of unknown spectra based on a measure of similarity with one or more known spectra. Two popular spectral matching algorithms use different error metrics and constraints to determine the existence of a spectral match. Multiple endmember spectral mixture analysis (MESMA) is a linear mixing model that uses a root mean square error (RMSE) error metric. Spectral angle mapper (SAM) compares two spectra using a spectral angle error metric. This paper compares two endmember MESMA and SAM using a spectral library containing six land cover classes. RMSE and spectral angle for models within each land cover class were directly compared. The dependence of RMSE on the albedo of the modeled spectrum was also explored. RMSE and spectral angle were found to be closely related, although not equivalent, due to variations in the albedo of the modeled spectra. Error constraints applied to both models resulted in large differences in the number of spectral matches. Using MESMA, the number of spectra modeled within the error constraint increased as the albedo of the modeled spectra decreased. The value of the error constraint used was shown to make a much larger difference in the number of spectra modeled than the choice of spectral matching algorithm. Numéro de notice : A2004-440 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2004.07.013 En ligne : https://doi.org/10.1016/j.rse.2004.07.013 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26960
in Remote sensing of environment > vol 93 n° 3 (15/11/2004) . - pp 359 - 367[article]Calibrating geodetic instruments: standards for calibration and testing / P. Savvaidis in Geoinformatics, vol 7 n° 7 (01/11/2004)
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Titre : Calibrating geodetic instruments: standards for calibration and testing Type de document : Article/Communication Auteurs : P. Savvaidis, Auteur ; I.M. Ifadis, Auteur ; I.D. Doukas, Auteur ; et al., Auteur Année de publication : 2004 Article en page(s) : pp 18 - 21 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie
[Termes IGN] contrôle qualité
[Termes IGN] distancemètre
[Termes IGN] erreur systématique
[Termes IGN] étalonnage d'instrument
[Termes IGN] instrument de géodésie
[Termes IGN] instrument de mesure
[Termes IGN] instrument de nivellement
[Termes IGN] niveau (instrument)
[Termes IGN] précision des mesures
[Termes IGN] récepteur GPS
[Termes IGN] tachéomètre électronique
[Termes IGN] théodoliteRésumé : (Auteur) Calibration is a set of operations that establish, under specified conditions, the relationship between values of quantities indicated by measuring instrument or system, and the corresponding values realized by standards. Calibration is achieved by means of direct comparison against measurement standards certified reference materials. In geodetic works, there is always the need to ensure the quality of the carried out measurements, in agreement with the proper per project accuracy specifications. Furthermore, it has been demonstrated that the measuring accuracy of the instruments weakens during use. In order to achieve the accuracy of the measurements to comply with the specifications or standards, the calibration of the instruments used (from optical theodolites and levels to EDM instruments, Total Stations and GPS systems) is of paramount importance. Numéro de notice : A2004-467 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26987
in Geoinformatics > vol 7 n° 7 (01/11/2004) . - pp 18 - 21[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 262-04071 SL Revue Centre de documentation Revues en salle Disponible Detection of buried targets via active selection of labeled data: Application to sensing subsurface UXO / Y. Zhang in IEEE Transactions on geoscience and remote sensing, vol 42 n° 11 (November 2004)
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Titre : Detection of buried targets via active selection of labeled data: Application to sensing subsurface UXO Type de document : Article/Communication Auteurs : Y. Zhang, Auteur ; X. Liao, Auteur ; L. Carin, Auteur Année de publication : 2004 Article en page(s) : pp 2535 - 2543 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] cible cachée
[Termes IGN] classification
[Termes IGN] détection de cible
[Termes IGN] erreur moyenne quadratique
[Termes IGN] matrice
[Termes IGN] matrice d'information de Fischer
[Termes IGN] mine antipersonnel
[Termes IGN] signature spectraleRésumé : (Auteur) When sensing subsurface targets, such as land-mine and unexploded ordnance (UXO), the target signatures are typically a strong function of environmental and historical circumstances. Consequently, it is difficult to constitute a universal training set for design of detection or classification algorithms. In this paper, we develop an efficient procedure by which information-theoretic concepts are used to design the basis functions and training set, directly from the site-specific measured data specifically, assume that measured data (e.g., induction and/or magnetometer) are available from a given site, unlabeled in the sense that it is not known a priori whether a given signature is associated with a target or clutter. For N signatures, the data may be expressed as {Xi, Yi}i=1,N, where xi is the measured data or buried object i, and yi is the associated unknown binary label (target/nontarget). Let the N xi define the set X. The algorithm works in four steps : 1) the Fisher information matrix is used to select a set of basis functions for the kernel-based algorithm, this step defining a set of n signatures Bn X that are most informative in characterizing the signature distribution of the site; 2) the Fisher information matrix is used again to define a small subset Xs X, composed of those xi for which knowledge of the associated labels yi would be most informative in defining the weights, for the basis functions in Bn ; 3) the buried objects associated with the signatures in Xs., are excavated, yielding the associated labels yi, represented by the set Ys.; and 4) using Bn, Xs, and Ys, a kernel-based classifier is designed for use in classifying all remaining buried objects. This framework is discussed in detail, with example results presented for an actual buried-UXO site. Numéro de notice : A2004-462 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2004.836270 En ligne : https://doi.org/10.1109/TGRS.2004.836270 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26982
in IEEE Transactions on geoscience and remote sensing > vol 42 n° 11 (November 2004) . - pp 2535 - 2543[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 065-04111 RAB Revue Centre de documentation En réserve L003 Disponible Filtering airborne Laser scanner data: a wavelet-based clustering method / T. Thuy in Photogrammetric Engineering & Remote Sensing, PERS, vol 70 n° 11 (November 2004)
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Titre : Filtering airborne Laser scanner data: a wavelet-based clustering method Type de document : Article/Communication Auteurs : T. Thuy, Auteur ; M. Tokunaga, Auteur Année de publication : 2004 Article en page(s) : pp 1267 - 1274 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] analyse de groupement
[Termes IGN] analyse multirésolution
[Termes IGN] données laser
[Termes IGN] erreur moyenne quadratique
[Termes IGN] filtrage numérique d'image
[Termes IGN] modèle de dispersion
[Termes IGN] modèle numérique de terrain
[Termes IGN] pente
[Termes IGN] précision géométrique (imagerie)
[Termes IGN] Stuttgart
[Termes IGN] télémétrie laser aéroporté
[Termes IGN] Tokyo (Japon)
[Termes IGN] transformation en ondelettesRésumé : (Auteur) Filtering the airborne laser scanner data is challenging due to the complex distribution of objects on Earth's surface and it is still in development stage. This problem has been investigated so far with varieties of algorithms, but they suffer from different magnitudes of drawbacks. This study proposed a new and improved hybrid method based on multi-resolution analysis. Wavelet was adopted in this multi-resolution clustering approach. It enabled the classification of objects based on their size and the efficiency to filter out unwanted information at a specific resolution, and the proposed algorithm is named the ALSwave (Airborne Laser Scanner Wavelet) method. ALSwave has been tested on two data sets acquired over the urban areas of Tokyo, Japan and Stuttgart, Germany. The results showed a well-filtered, bare earth surface coupled with acceptable computational time. The accuracy assessment was carried out by comparison between the filtered bare earth surface by ALSwave and the manually filtered surface. The Root Mean Square Error (RMSE) follows a linear relationship with respect to terrain slope. This wavelet-based approach has opened a new way to filter the raw laser data that subsequently generates fast and more accurate digital terrain models. Numéro de notice : A2004-457 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.70.11.1267 En ligne : https://doi.org/10.14358/PERS.70.11.1267 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26977
in Photogrammetric Engineering & Remote Sensing, PERS > vol 70 n° 11 (November 2004) . - pp 1267 - 1274[article]Characterizing errors in airborne Laser altimetry data to extract soil roughness / Ian J. Davenport in IEEE Transactions on geoscience and remote sensing, vol 42 n° 10 (October 2004)
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Titre : Characterizing errors in airborne Laser altimetry data to extract soil roughness Type de document : Article/Communication Auteurs : Ian J. Davenport, Auteur ; N. Holden, Auteur ; R.J. Gurney, Auteur Année de publication : 2004 Conférence : IGARSS 2003, International Geoscience And Remote Sensing Symposium 21/07/2003 25/07/2003 Toulouse France Proceedings IEEE Article en page(s) : pp 2130 - 2141 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] altitude
[Termes IGN] cohérence des données
[Termes IGN] erreur aléatoire
[Termes IGN] erreur de mesure
[Termes IGN] erreur moyenne quadratique altimétrique
[Termes IGN] rugosité du sol
[Termes IGN] surface du sol
[Termes IGN] système de positionnement par satellites
[Termes IGN] télémétrie laser aéroportéRésumé : (Auteur) Airborne laser altimetry has the potential to make frequent detailed observations that are important for many aspects of studying land surface processes. However, the uncertainties inherent in airborne laser altimetry data have rarely been well measured. Uncertainty is often specified as generally as 20 cm in elevation and 40 cm planimetric. To better constrain these uncertainties, we present an analysis of several datasets acquired specifically to study the temporal consistency of laser altimetry data and, thus, assess its operational value. The error budget has three main components, each with a time regime. For measurements acquired less than 50 ms apart, elevations have a local standard deviation in height of 3.5 cm, enabling the local measurement of surface roughness of the order of 5 cm. Points acquired seconds apart acquire an additional random error due to differential geographic positioning system fluctuation. Measurements made up to an hour apart show an elevation drift of 7 cm over a half hour. Over months, this drift gives rise to a random elevation offset between swathes, with an average of 6.4 cm. The root mean square planimetric error in point location was derived as 37.4 cm. We conclude by considering the consequences of these uncertainties on the principle application of laser altimetry in the U.K. intertidal zone monitoring. Numéro de notice : A2004-455 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2004.834648 En ligne : https://doi.org/10.1109/TGRS.2004.834648 Format de la ressource électronique : URl article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26975
in IEEE Transactions on geoscience and remote sensing > vol 42 n° 10 (October 2004) . - pp 2130 - 2141[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 065-04101 RAB Revue Centre de documentation En réserve L003 Disponible Spatiotriangulation with multisensor VIR/SAR / Thierry Toutin in IEEE Transactions on geoscience and remote sensing, vol 42 n° 10 (October 2004)
PermalinkEffect of support size on the accuracy of a distributed rockfall model / L.K.A. Dorren in International journal of geographical information science IJGIS, vol 18 n° 6 (october 2004)
PermalinkCombining weather prediction and remote sensing data for the calculation of evapotranspiration rates: application to Denmark / E. Boegh in International Journal of Remote Sensing IJRS, vol 25 n° 13 (July 2004)
PermalinkAccuracy assessment of Quickbird stereo imagery / M. Noguchi in Photogrammetric record, vol 19 n° 106 (June - August 2004)
PermalinkDTM generation from Ikonos in-track stereo images using a 3D physical model / Thierry Toutin in Photogrammetric Engineering & Remote Sensing, PERS, vol 70 n° 6 (June 2004)
PermalinkSmall-footprint lidar estimation of sub-canopy elevation and tree height in a tropical rain forest landscape / M.L. Clarke in Remote sensing of environment, vol 91 n° 1 (15/05/2004)
PermalinkValidation and calibration of Canada-wide coarse-resolution satellite burned-area maps / R.H. Fraser in Photogrammetric Engineering & Remote Sensing, PERS, vol 70 n° 4 (April 2004)
PermalinkIntegrating imaging spectroscopy and neural networks to map grass quality in the Kruger National Park, South Africa / Onisimo Mutanga in Remote sensing of environment, vol 90 n° 1 (15/03/2004)
PermalinkCaractérisation d'erreurs sur un MNT en fonction de zones morphologiques / Frédéric Rousseaux in Géomatique expert, n° 32 (01/03/2004)
PermalinkL'exemple du nivellement direct : les tolérances des levés / Anonyme in Géomètre, n° 2001 (février 2004)
PermalinkNarrowband-to-broadband albedo conversion for glacier ice and snow: equations based on modeling and ranges of validity of the equations / W. Greuell in Remote sensing of environment, vol 89 n° 1 (15/01/2004)
PermalinkToward universal broad leaf chlorophyll indices using PROSPECT simulated database and hyperspectral reflectance measurements / G. Le Maire in Remote sensing of environment, vol 89 n° 1 (15/01/2004)
PermalinkEvaluation de la qualité des bases de données géographiques de référence à la communauté urbaine de Bordeaux / Yann Sorton (2004)
PermalinkPermalinkPermalinkOptimisation de levés microgravimétriques au Laboratoire souterrain à bas bruit (Rustrel, 84) / Jacques Beilin (2004)
PermalinkPermalinkNear real-time geocoding of SAR imagery with orbit error removal / A.J.E. Smith in International Journal of Remote Sensing IJRS, vol 24 n° 24 (December 2003)
PermalinkComparaison de méthodes de calibrage du centre de phase d'antennes GPS / B. Akrour in Geomatica, vol 57 n° 4 (December 2003)
PermalinkRetrieval of atmospheric water vapour using a ground-based single-channel microwave radiometer / P. Jarlemark in International Journal of Remote Sensing IJRS, vol 24 n° 19 (October 2003)
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