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A four-component efficiency index for assessing land development using remote sensing and GIS / X. Li in Photogrammetric Engineering & Remote Sensing, PERS, vol 71 n° 1 (January 2005)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 71 n° 1 (January 2005) . - pp 47 - 57 Titre : A four-component efficiency index for assessing land development using remote sensing and GIS Type de document : Article/Communication Auteurs : X. Li, Auteur Année de publication : 2005 Article en page(s) : pp 47 - 57 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] aménagement du territoire [Termes IGN] Chine [Termes IGN] Component Object Model [Termes IGN] données environnementales [Termes IGN] estimation quantitative [Termes IGN] géopositionnement [Termes IGN] implémentation (informatique) [Termes IGN] indicateur [Termes IGN] morphologie urbaine [Termes IGN] qualité des données [Termes IGN] système d'information géographique [Termes IGN] utilisation du sol Résumé : (Auteur) A variety of indices have been proposed to facilitate the quantitative analysis in remote sensing applications. The assessment of land development is important for minimizing development impacts and formulating alternative development plans. Much attention has been paid to the quantity of land use changes in general development assessment using remote sensing. However, additional information can be obtained from remote sensing and GIS for revealing land use problems more effectively. This paper presents four indicators, quantity, quality, location, and morphology to characterize land development patterns for fast-growing regions. A four-component efficiency index is further developed for ranking purposes to reflect economic and environmental considerations. The implementation of the method has been demonstrated in a fast-growing region in south China. Efforts have been made to verify the model with independent empirical data. Numéro de notice : A2005-010 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/10106040208542240 En ligne : http://dx.doi.org/10.1080/10106040208542240 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27149 [article]

Augmenting grid-based contours to improve thin-plate DEM generation / M.B. Gousie in Photogrammetric Engineering & Remote Sensing, PERS, vol 71 n° 1 (January 2005)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 71 n° 1 (January 2005) . - pp 69 - 79 Titre : Augmenting grid-based contours to improve thin-plate DEM generation Type de document : Article/Communication Auteurs : M.B. Gousie, Auteur ; W.R. Franklin, Auteur Année de publication : 2005 Article en page(s) : pp 69 - 79 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] artefact [Termes IGN] contour [Termes IGN] fonction spline d'interpolation [Termes IGN] interpolation [Termes IGN] isoligne [Termes IGN] maillage [Termes IGN] modèle numérique de surface Résumé : (Auteur) We present two new pre-processing techniques that improve thin plate Digital Elevation Model (DEM) approximations from grid-based contour data. One method computes gradients from an initial interpolated or approximated surface. The aspects are used to create gradient paths that are interpolated using Catmull-Rom splines. The computed elevations are added to the initial contour data set. Thin plate methods are applied to all of the data. The splines allow information to flow across contours, improving the final surface. The second method successively computes new, intermediate contours in between existing isolines, which provide additional data for subsequent thin plate processing. Both methods alleviate artifacts visible in previous thin plate methods. The surfaces are tested with published methods to show qualitative and quantitative improvements over previous methods. Numéro de notice : A2005-011 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.71.1.69 En ligne : https://doi.org/10.14358/PERS.71.1.69 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27150 [article]

Automated quality control for orthoimages and DEMs / J.K. Höhle in Photogrammetric Engineering & Remote Sensing, PERS, vol 71 n° 1 (January 2005)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 71 n° 1 (January 2005) . - pp 81 - 87 Titre : Automated quality control for orthoimages and DEMs Type de document : Article/Communication Auteurs : J.K. Höhle, Auteur ; Markéta Potůčková, Auteur Année de publication : 2005 Article en page(s) : pp 81 - 87 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] appariement d'images [Termes IGN] contrôle qualité automatique [Termes IGN] corrélation automatique de points homologues [Termes IGN] modèle numérique de surface [Termes IGN] orthoimage [Termes IGN] précision géométrique (imagerie) [Termes IGN] seuillage d'image Résumé : (Auteur) The checking of the geometric accuracy of orthoimages and digital elevation models (DEMs) is discussed. As a reference, an existing orthoimage and a second orthoimage derived from an overlapping aerial image, are used. The proposed automated procedures for checking the orthoimages and DEMs are based on matching of corresponding image patches. Existing topographic databases are additionally used in order to select time-invariant objects as checkpoints. In order to avoid blunders in the correlation, thresholds for similarity measures are applied. Detailed studies show that a combination of thresholds for the maximum correlation coefficient, the average mutual information, and distance can reduce the number of blunders in the automated measurements considerably and should therefore be applied. The calculation of DEM errors is carried out by an improved-formula. The new methods and procedures are applied to two practical examples, and the results are presented. Numéro de notice : A2005-012 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.71.1.81 En ligne : https://doi.org/10.14358/PERS.71.1.81 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27151 [article]