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A correctly weighted least squares adjustment - Part 1 Problems from using computed standard deviations / Charles D. Ghilani in xyHt, vol 2016 n° 1 (January 2016)

Public [article]  inxyHt > vol 2016 n° 1 (January 2016) . - pp 36 - 37 Titre : A correctly weighted least squares adjustment - Part 1 Problems from using computed standard deviations Type de document : Article/Communication Auteurs : Charles D. Ghilani, Auteur Année de publication : 2016 Article en page(s) : pp 36 - 37 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Topographie [Termes IGN] compensation de coordonnées [Termes IGN] compensation par moindres carrés [Termes IGN] écart type [Termes IGN] erreur aléatoire Résumé : (auteur) According to the 2011 minimum standard detail requirements for ALTA/ACSM Land Title Surveys, "'Relative Positional Precision' means the length of the semi-major axis, expressed in feet or meters, of the error ellipse representing the uncertainty due to random errors in measurements in the location of the monument, or witness, marking any corner of the surveyed property relative to the monument, or witness, marking any other corner of the surveyed property at the 95 percent confidence level (two standard deviations). Relative Positional Precision is estimated by the results of a correctly weighted least squares adjustment of the survey." (ALTA/ACSM, 2011) Numéro de notice : A2016-618 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81823 [article]

Voir aussi

• A correctly weighted least squares adjustment - Part 3 Estimating standard errors in angular observations / Charles D. Ghilani in xyHt, vol 2016 n° 4 (April 2016)
• A correctly weighted least squares adjustment - Part 2 Estimating uncertainties / Charles D. Ghilani in xyHt, vol 2016 n° 2 (February 2016)

The vanishing divide : new solutions bridge the gap between CAD and GIS / Matteo Luccio in xyHt, vol 2016 n° 1 (January 2016)

Public [article]  inxyHt > vol 2016 n° 1 (January 2016) . - pp 18 - 23 Titre : The vanishing divide : new solutions bridge the gap between CAD and GIS Type de document : Article/Communication Auteurs : Matteo Luccio, Auteur Année de publication : 2016 Article en page(s) : pp 18 - 23 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique [Termes IGN] conception assistée par ordinateur [Termes IGN] dessin assisté par ordinateur [Termes IGN] modélisation 3D du bâti BIM Résumé : (auteur) [introduction] For decades, computer-aided design (CAD) and geographic information systems (GIS) have been like oil and water. CAD users, who see their work as engineering-based, focus on very accurate measurements and high-precision placement. They view GIS as neither accurate nor precise. GIS users, who see their work as larger scale and more cartographic in nature, cannot achieve the same accuracy over large geographies. While CAD is mostly about points and lines, GIS is also about polygons, imagery, and colors used to convey large amounts of information. While both have attributes and layers, users treat them and store them differently. In recent years, building information modeling (BIM) has emerged as a third parallel universe in the architecture, engineering, and construction (AEC) sector. Numéro de notice : A2016-620 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81826 [article]