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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)
[article]
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]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)
[article]
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]Exemplaires(1)
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)
[article]
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]Effect 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)
[article]
Titre : Effect of support size on the accuracy of a distributed rockfall model Type de document : Article/Communication Auteurs : L.K.A. Dorren, Auteur ; Gerard B.M. Heuvelink, Auteur Année de publication : 2004 Article en page(s) : pp 595 - 609 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] agrégation spatiale
[Termes IGN] analyse comparative
[Termes IGN] éboulement
[Termes IGN] erreur moyenne quadratique
[Termes IGN] modèle de simulation
[Termes IGN] modèle numérique de surface
[Termes IGN] prévention des risques
[Termes IGN] système d'information géographiqueRésumé : (Auteur) It is investigated whether a GIS-based distributed model developed for rockfall assessment at slope scale, which uses data with a support of 2.5 x 2.5 m, could be used for rockfall assessment at the regional scale, using input data with a support of 25 x 25 m and of poorer quality. It was anticipated that in the latter case the model error would increase. Three types of simulations were applied to the same model and the outcomes were validated with field data. The first simulation used input data with a support of 2.5 x 2.5 m and aggregated the output to a support of 25 x 25 m. The second simulation used the same input data as in the first simulation, but these data were aggregated to a support of 25 x 25 m before running the model. The third simulation used input data of poorer quality obtained at a support of 25 x 25 m. The results show that simulating the maximum extent of rockfall runout zones with a distributed model using data with a support of 25 x 25 m is realistic and feasible. This is also true for data with poorer quality as the third simulation resulted in a slightly larger mean-squared error than the first simulation. Surprisingly, it also gave a smaller error than the second simulation. We investigated the cause of the large error produced by the second simulation and concluded that this was mainly caused by the combination of a high-quality digital elevation model and the loss of spatial structure in the input data due to spatial aggregation. Numéro de notice : A2004-352 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/13658810410001703804 En ligne : https://doi.org/10.1080/1365881041000170380403804 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26879
in International journal of geographical information science IJGIS > vol 18 n° 6 (october 2004) . - pp 595 - 609[article]Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 079-04061 RAB Revue Centre de documentation En réserve L003 Disponible 079-04062 RAB Revue Centre de documentation En réserve L003 Disponible Combining 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)
[article]
Titre : Combining weather prediction and remote sensing data for the calculation of evapotranspiration rates: application to Denmark Type de document : Article/Communication Auteurs : E. Boegh, Auteur ; H. Soegaard, Auteur ; et al., Auteur Année de publication : 2004 Article en page(s) : pp 2553 - 2574 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] correction atmosphérique
[Termes IGN] Danemark
[Termes IGN] erreur moyenne quadratique
[Termes IGN] évapotranspiration
[Termes IGN] humidité de l'air
[Termes IGN] image NOAA-AVHRR
[Termes IGN] prévision météorologique
[Termes IGN] trajectographie (positionnement)Résumé : (Auteur) Evapotranspiration rates in Denmark were estimated using Advanced Very High Resolution Radiometer (AVHRR) satellite data and weather conditions predicted by a high-resolution weather forecast model (HIRLAM). The predictions were used both for atmospheric correction of satellite data and for remote sensing based calculation of net radiation, sensible heat fluxes and evapotranspiration rates. Climate predictions at 12 GMT were used as proxies for the atmospheric conditions at the time of the afternoon satellite passage (12.30-14.30 GMT). The air temperature at the time of the satellite passage was retrieved with a rms error of 1.9ºC, and the rms error of the retrieved air humidity was 204 Pa. The evapotranspiration results were significantly influenced by the spatial distribution of weather conditions. Due to the encirclement of Denmark by sea shorelines, sea breezes extending more than 30 km inland were responsible for the intrusion of cooler air temperatures which increased the sensible heat fluxes and suppressed the evapotranspiration rates. The predictions were linearly related to eddy-covariance flux measurements representing agricultural land, beech forest and conifer forest, but the relationships were also characterized by a large degree of scattering. The results are discussed in relation to inaccuracies and future perspectives. Numéro de notice : A2004-260 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160310001647984 En ligne : https://doi.org/10.1080/01431160310001647984 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26787
in International Journal of Remote Sensing IJRS > vol 25 n° 13 (July 2004) . - pp 2553 - 2574[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 080-04111 RAB Revue Centre de documentation En réserve L003 Exclu du prêt Small-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)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)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)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)PermalinkIncreasing the spatial resolution of agricultural land cover maps using a Hopfield neural network / A.J. Tatem in International journal of geographical information science IJGIS, vol 17 n° 7 (october 2003)PermalinkIntegrating interferometric SAR data with levelling measurements of land subsidence using geostatistic / Y. Zhou in International Journal of Remote Sensing IJRS, vol 24 n° 18 (September 2003)PermalinkArrêté sur les classes de précision applicables aux catégories de travaux topographiques : quelques aspects statistiques [projet d'arrêté, texte soumis au visa du ministre et approuvé par le CNIG] / Patrick Sillard in XYZ, n° 96 (septembre - novembre 2003)PermalinkGeometric information from Ikonos: strict and highly accurate solution based on VirtuoZo / Z. Hu in GIM international, vol 17 n° 9 (September 2003)Permalink