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Ordering points for incremental TIN construction from DEMs / J.J. Little in Geoinformatica, vol 7 n° 1 (March - May 2003)  

Public [article]  inGeoinformatica > vol 7 n° 1 (March - May 2003) . - pp 33 - 53 Titre : Ordering points for incremental TIN construction from DEMs Type de document : Article/Communication Auteurs : J.J. Little, Auteur ; P. Shi, Auteur Année de publication : 2003 Article en page(s) : pp 33 - 53 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie numérique [Termes IGN] erreur absolue [Termes IGN] erreur aléatoire [Termes IGN] erreur moyenne quadratique [Termes IGN] ligne de base [Termes IGN] modèle numérique de terrain [Termes IGN] Triangulated Irregular Network Résumé : (Auteur) The standard method of building compact triangulated surface approximations to terrain surfaces (TINs) from dense digital elevation models (DEMs) adds points to an initial sparse triangulation or removes points from a dense initial mesh. Typically, in each triangle in the current TIN, the worst fitting point, in terms of vertical distance, is selected. The order of insertion of the points is determined by the magnitude of the maximum vertical difference. This measure produces triangulations that minimize the maximum vertical distance between the TIN and the source DEM. Other approximation criteria are often used, however, including the rootmeansquared error or the mean absolute error, both for the vertical difference and normal difference, i.e., the distance in the direction of the normal to the triangular approximation. For these approximation criteria, we still select the worst fit point, but determine the insertion order by various sums of' errors over the triangle. Experiments show that using these better evaluation measures significantly reduces the size of the TIN for a given approximation error. Numéro de notice : A2003-060 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1023/A:1022870110853 En ligne : https://doi.org/10.1023/A:1022870110853 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22356 [article]

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Assessment of the urban development plan of Beijing by using a CA-based urban growth model / J. Chen in Photogrammetric Engineering & Remote Sensing, PERS, vol 68 n° 10 (October 2002)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 68 n° 10 (October 2002) . - pp 1063 - 1071 Titre : Assessment of the urban development plan of Beijing by using a CA-based urban growth model Type de document : Article/Communication Auteurs : J. Chen, Auteur ; P. Gong, Auteur ; C. He, Auteur ; W. Luo, Auteur ; M. Tamura, Auteur ; P. Shi, Auteur Année de publication : 2002 Article en page(s) : pp 1063 - 1071 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie numérique [Termes IGN] automate cellulaire [Termes IGN] croissance urbaine [Termes IGN] modèle mathématique [Termes IGN] Pékin (Chine) Résumé : (Auteur) We developed a CA-based urban growth simulation model to emulate the city growth before 1997 and simulate possible change scenarios after that. An adaptive Monte-Carlo method was used to automate the calibration of factor weights used in the CA transitional rules. We used one scene of Landsat MSS imagery from 1975 and three scenes of TM imageiy from 1984, 1991, and 1997 to classify the land-use patterns, and we used the results to calibrate the CA model. We applied the model to assess the general urban development plan entitled "disperse polycentric urban development plan" of Beijing City and found that the plan failed to meet its objectives. Numéro de notice : A2002-235 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : sans En ligne : https://www.asprs.org/wp-content/uploads/pers/2002journal/october/2002_oct_1063- [...] Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22149 [article]