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Comparison of four line-based positional assessment methods by means of synthetic data / F. Arira-Lopez in Geoinformatica, vol 16 n° 2 (April 2012)
[article]
Titre : Comparison of four line-based positional assessment methods by means of synthetic data Type de document : Article/Communication Auteurs : F. Arira-Lopez, Auteur ; A. Mozas-Calvache, Auteur Année de publication : 2012 Article en page(s) : pp 221 - 243 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique
[Termes IGN] distance de Hausdorff
[Termes IGN] estimation de position
[Termes IGN] qualité des données
[Termes IGN] valeur aberrante
[Termes IGN] zone tamponRésumé : (Auteur) Positional accuracy of spatial data can be assessed by means of line-based methods. In this work we develop an analysis of the following four methods: Hausdorff Distance, Mean Distance, Single Buffer Overlay and Double Buffer Overlay, using a set of 12 synthetic cases. The synthetic cases incorporate specific shape features for bias, random errors and outliers which correspond to simplified versions of real world possibilities. The use of synthetic cases helps us to understand the basic behavioral differences between the methods. Numerical results for the positional accuracy estimations are different between methods and cases due to the different concepts of distance involved and the specific configurations of each case. When the method results in a function, patterns related to different types of errors can be detected in this function. The length-inclusion level of each method is revealed as the base criterion for comparison. The Single Buffer Overlay Method offers the more general solution because it includes the others’ results. Numéro de notice : A2012-087 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1007/s10707-011-0130-y Date de publication en ligne : 01/07/2011 En ligne : https://doi.org/10.1007/s10707-011-0130-y Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31535
in Geoinformatica > vol 16 n° 2 (April 2012) . - pp 221 - 243[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 057-2012021 RAB Revue Centre de documentation En réserve L003 Disponible Exploration of information: theoretic arguments for the limited amount of information in a map / J. Bjorke in Cartography and Geographic Information Science, vol 39 n° 2 (April 2012)
[article]
Titre : Exploration of information: theoretic arguments for the limited amount of information in a map Type de document : Article/Communication Auteurs : J. Bjorke, Auteur Année de publication : 2012 Article en page(s) : pp 88 - 97 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie
[Termes IGN] cartographie par internet
[Termes IGN] conception cartographique
[Termes IGN] exploration de données
[Termes IGN] lisibilité perceptive
[Termes IGN] qualité des données
[Termes IGN] variable visuelle
[Termes IGN] visibilité
[Termes IGN] visualisation cartographiqueRésumé : (Auteur) From the application of information theory capacity limits of maps are derived and some cartographic rules are formulated—based on theoretical models and perception studies. The perception study shows that for a relief map with coloured height intervals the channel capacity, as defined in information theory, is reached at seven~~eight height classes. Generally, the length of a visual variable may be characterized by the channel capacity of the map. This theoretical study shows how increased attention should be paid to perceptual separation as the number of categories increases. The requirement becomes more and more crucial as the number of categories exceeds five. The principle of group visibility is formulated and demonstrated. Group visibility considers the visibility of groups of map features and may be utilized in a visual search for geographical patterns. The quantitative measures presented offers computational methods to control group visibility for example in an interactive visualization system. Numéro de notice : A2012-453 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1559/1523040639288 En ligne : https://doi.org/10.1559/1523040639288 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31899
in Cartography and Geographic Information Science > vol 39 n° 2 (April 2012) . - pp 88 - 97[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 032-2012021 RAB Revue Centre de documentation En réserve L003 Disponible Transaction rules for updating surfaces in 3D GIS / G. Groger in ISPRS Journal of photogrammetry and remote sensing, vol 69 (April 2012)
[article]
Titre : Transaction rules for updating surfaces in 3D GIS Type de document : Article/Communication Auteurs : G. Groger, Auteur ; L. Plumer, Auteur Année de publication : 2012 Article en page(s) : pp 134 - 145 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique
[Termes IGN] cohérence des données
[Termes IGN] contrainte d'intégrité
[Termes IGN] données localisées 3D
[Termes IGN] modèle numérique de surface
[Termes IGN] programmation par contraintes
[Termes IGN] règle
[Termes IGN] SIG 3DRésumé : (Auteur) Three-dimensional surface models representing the terrain and the outer hull of objects such as buildings and bridges support important 3D GIS applications, for example telecommunication planning and noise emission simulation. Updates of surface models often introduce errors which violate basic assumptions of users and their applications. The notion of geometric-topological consistency covers many of these assumptions. It guarantees that objects do not penetrate mutually or that objects completely cover other objects. Assuring that updates do not violate geometric-topological consistency constitutes a major challenge for 3D GIS which has not been satisfactorily met so far. This article presents a solution which is based on efficient transaction rules for updating 3D surface models. We show that these rules are safe (consistency is preserved by any rule application) and complete (any consistent surface model can be generated by successive rule applications). For both properties rigorous mathematic proofs are given. Numéro de notice : A2012-197 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2012.03.004 En ligne : https://doi.org/10.1016/j.isprsjprs.2012.03.004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31644
in ISPRS Journal of photogrammetry and remote sensing > vol 69 (April 2012) . - pp 134 - 145[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 081-2012031 SL Revue Centre de documentation Revues en salle Disponible VGI as big data: a new but delicate geographic data-source / F. Fischer in Geoinformatics, vol 15 n° 3 (01/04/2012)
[article]
Titre : VGI as big data: a new but delicate geographic data-source Type de document : Article/Communication Auteurs : F. Fischer, Auteur Année de publication : 2012 Article en page(s) : pp 46 - 47 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique
[Termes IGN] données localisées des bénévoles
[Termes IGN] fiabilité des donnéesRésumé : (Editeur) APIs from popular geo-social applications like Foursquare provide big data with geographical context. These data - also termed Volunteered Geographic Information - are a valuable information base for real-time geo-demographics for user profiling. But big data are not always better data. With regard to geo-demographic analysis, big geographical data hold obstacles in terms of reliability and validity that require a more comprehensive understanding of the genesis of VGI. Numéro de notice : A2012-167 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/SOCIETE NUMERIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31614
in Geoinformatics > vol 15 n° 3 (01/04/2012) . - pp 46 - 47[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 262-2012031 SL Revue Centre de documentation Revues en salle Disponible Relative radiometric correction of multi-temporal ALOS AVNIR-2 data for the estimation of forest attributes / Q. Xu in ISPRS Journal of photogrammetry and remote sensing, vol 68 (March 2012)
[article]
Titre : Relative radiometric correction of multi-temporal ALOS AVNIR-2 data for the estimation of forest attributes Type de document : Article/Communication Auteurs : Q. Xu, Auteur ; Z. Hou, Auteur ; Timo Tokola, Auteur Année de publication : 2012 Article en page(s) : pp 69 - 78 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] analyse comparative
[Termes IGN] correction radiométrique
[Termes IGN] détection
[Termes IGN] forêt
[Termes IGN] image ALOS-AVNIR2
[Termes IGN] image multitemporelle
[Termes IGN] précision des données
[Termes IGN] troncRésumé : (Auteur) Relative radiometric correction methods have been widely used to correct ground illumination difference in multi-temporal satellite data. ALOS (Advanced Land Observing Satellite) data starts to play an important role in forest and carbon assessment, such as the REDD (Reducing Emissions from Deforestation and forest Degradation) program. The objective of the study was to compare three relative radiometric correction methods for five multi-temporal ALOS AVNIR-2 (Advanced Visible and Near Infrared Radiometer) images, and to examine the influence of each correction method on the estimation accuracy of forest attributes with auxiliary field inventory plot data. Both spectral features and textural features were extracted before and after radiometric correction and used in estimation procedure. All the radiometric correction methods used improved the estimation accuracy of forest stem volume at plot level, and they were MAD (multivariate alteration detection) transformation-based normalization, PCA (principle component analysis)-based correction and local radiometric correction, among which MAD transformation-based normalization exceeded others by reducing the relative RMSE by 5.75% with the ordinary least square fitting and 6.8% with the K-MSN (K-Most Similar Neighbour) method both after leave-one-out cross-validation. RMSE for only the corrected area is also calculated, in view of the small proportion of plots in that area. The result can be used to improve the visual effect of mosaics of multi-temporal ALOS scenes, and to retrieve more accurate forest estimates for national forest resources and biomass mapping. Numéro de notice : A2012-147 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2011.12.008 En ligne : https://doi.org/10.1016/j.isprsjprs.2011.12.008 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31594
in ISPRS Journal of photogrammetry and remote sensing > vol 68 (March 2012) . - pp 69 - 78[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 081-2012021 SL Revue Centre de documentation Revues en salle Disponible Road network extraction in suburban areas / A. Grote in Photogrammetric record, vol 27 n° 137 (March - May 2012)PermalinkPermalinkModèle d'estimation de l'imprécision des mesures géométriques de données géographiques / Jean-François Girres (2012)PermalinkProvably correct and complete transaction rules for updating 3D city models / G. Groger in Geoinformatica, vol 16 n° 1 (January 2012)PermalinkPermalinkPermalinkAn assessment of internal neural network parameters affecting image classification accuracy / L. Zhou in Photogrammetric Engineering & Remote Sensing, PERS, vol 77 n° 12 (December 2011)PermalinkData fusion of extremely high resolution aerial imagery and LiDAR data for automated railroad centre line reconstruction / R. Beger in ISPRS Journal of photogrammetry and remote sensing, vol 66 n° 6 supplement (December 2011)PermalinkPermalinkLa photogrammétrie, un marché qui mérite d'être approfondi / Anne Fantuzzi in Géomètre, n° 2087 (décembre 2011)Permalink