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Automatic determination of stream networks from DEMs by using road network data to locate culverts / Ville Mäkinen in International journal of geographical information science IJGIS, Vol 33 n° 1-2 (January - February 2019)  

Public [article]  inInternational journal of geographical information science IJGIS > Vol 33 n° 1-2 (January - February 2019) . - pp 291 - 313 Titre : Automatic determination of stream networks from DEMs by using road network data to locate culverts Type de document : Article/Communication Auteurs : Ville Mäkinen, Auteur ; Juha Oksanen, Auteur ; Tapani Sarjakoski, Auteur ; Tapani Sarjakoski, Auteur Année de publication : 2019 Article en page(s) : pp 291 - 313 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] détection automatique [Termes IGN] données lidar [Termes IGN] données localisées 3D [Termes IGN] écoulement des eaux [Termes IGN] Finlande [Termes IGN] itération [Termes IGN] modèle numérique de surface [Termes IGN] réseau hydrographique [Termes IGN] réseau routier [Termes IGN] semis de points [Termes IGN] Triangulated Irregular Network Résumé : (auteur) Determining stream networks automatically from digital elevation models is an issue that is actively being studied. The quality of elevation models has increased over time, but many hydrologically critical features, such as culverts, are often missing from the elevation data. To analyze the surficial water flow, one must either prepare a special elevation model or post-process an already-existing model. This study builds on the traditional, well-established method of determining the stream network from digital elevation models. We have extended the traditional method by locating culverts automatically, using road network data as an input. We show, by comparison to the reference data, that the culverts being most relevant for the stream network can be found with good accuracy. We demonstrate that by including the automatically located culverts in the automatic stream network determination, the quality of the generated network can be noticeably improved. Numéro de notice : A2019-021 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2018.1530353 Date de publication en ligne : 11/10/2018 En ligne : https://doi.org/10.1080/13658816.2018.1530353 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91686 [article]

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A user study of experimental maps for outdoor activities / Juha Oksanen in Cartographica, vol 49 n° 3 (September 2014)  

Public [article]  inCartographica > vol 49 n° 3 (September 2014) . - pp 188 -201 Titre : A user study of experimental maps for outdoor activities Type de document : Article/Communication Auteurs : Juha Oksanen, Auteur ; Hanna-Marika Halkosaari, Auteur ; Tapani Sarjakoski, Auteur ; et al., Auteur Année de publication : 2014 Article en page(s) : pp 188 -201 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique [Termes IGN] analyse des correspondances [Termes IGN] carte numérique [Termes IGN] conception cartographique [Termes IGN] données topographiques Résumé : (Auteur) This article presents results from a user study on experimental maps created for outdoor activities and demonstrates methods suitable for analyzing the map survey data. The first goal of the study was to find out to what degree the experimental maps created for the study satisfy the needs of map users in general. The second was a detailed exploration of opinions on the different map types to look for trends related to age, frequency of map use, or amount of time spent in nature. A third goal was to gauge interest and willingness to pay for experimental maps as printed products. In addition, the article demonstrates how cross-tabulation and correspondence analysis can be used to conduct versatile quantitative analysis and interpret map survey data. The survey results suggest that the conventional topographic-map-like products for outdoor activities currently offered by map publishers should be supplemented by new kinds of maps to attract and educate digital natives to become active map users. At the same time, the quality of information and representation of terrain accessibility on maps for outdoor activities must not be compromised simply to fulfil the broad-based needs of map users. Numéro de notice : A2014-507 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.3138/carto.49.3.2185 En ligne : http://www.utpjournals.press/doi/full/10.3138/carto.49.3.2185 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=74099 [article]

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An information model for pedestrian routing and navigation databases supporting universal accessibility / Mari Laasko in Cartographica, vol 48 n° 2 (June 2013)  

Public [article]  inCartographica > vol 48 n° 2 (June 2013) . - pp 89 - 99 Titre : An information model for pedestrian routing and navigation databases supporting universal accessibility Type de document : Article/Communication Auteurs : Mari Laasko, Auteur ; Tapani Sarjakoski, Auteur ; Lassi Letho, Auteur ; L. Tiina Sarjakoski, Auteur Année de publication : 2013 Conférence : ICC 2013, 26th International Cartographic Conference ICA 25/08/2013 30/08/2013 Dresde Allemagne OA proceedings Article en page(s) : pp 89 - 99 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web [Termes IGN] accessibilité [Termes IGN] base de données localisées [Termes IGN] modèle conceptuel de données localisées [Termes IGN] navigation pédestre [Termes IGN] service web géographique [Termes IGN] UML [Termes IGN] visualisation cartographique Résumé : (Auteur) This study focuses on the information content of the geospatial databases used to guide pedestrians as well as those with disabilities. In this paper, we introduce an information model for describing this content. The model covers the physical environment faced by a person moving on foot. We have used the Unified Modeling Language class diagrams to formalize the information model on a conceptual level. The features are divided into two abstract top-level classes: one allowing pedestrian access and the other hindering it. A consistent and comprehensive pedestrian network is at the core of the model. The model also covers other geographical information to increase accessibility. The aim of the created information model is to help data providers to collect and store appropriate data using the appropriate methods. Numéro de notice : A2013-402 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.3138/carto.48.2.1837 En ligne : https://doi.org/10.3138/carto.48.2.1837 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32540 [article]

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Improving accessibility information in pedestrian maps and databases / M. Laasko in Cartographica, vol 46 n° 2 (June 2011)  

Public [article]  inCartographica > vol 46 n° 2 (June 2011) . - pp 101 - 108 Titre : Improving accessibility information in pedestrian maps and databases Type de document : Article/Communication Auteurs : M. Laasko, Auteur ; Tapani Sarjakoski, Auteur ; L. Tiina Sarjakoski, Auteur Année de publication : 2011 Article en page(s) : pp 101 - 108 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] accessibilité [Termes IGN] base de données localisées [Termes IGN] calcul d'itinéraire [Termes IGN] Finlande [Termes IGN] handicap [Termes IGN] itinéraire piétionnier [Termes IGN] mobilité urbaine [Termes IGN] navigation pédestre [Termes IGN] piéton Résumé : (Auteur) As populations age, more and more people have some kind of restrictions on their mobility. In order to increase the potential of mobility-impaired persons to move around and navigate independently, information on the accessibility of the environment should be supported by map services and delivered together with spatial information to their devices for personal navigation. Spatial databases for pedestrian route planning should contain more detailed information on accessibility, such as pavement surfaces, slopes, and stairs. This study examines a wide range of examples of map services in Finland in terms of the extent to which they support accessibility. The authors then provide and discuss a proposal for the information content of a geospatial database to fulfil the requirements of users with impairments. With guidelines for data content, data classification, and functionality, map information can be developed so that it is also more useful for special user groups and makes the environment more accessible for everyone. Numéro de notice : A2011-232 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.3138/carto.46.2.101 En ligne : https://doi.org/10.3138/carto.46.2.101 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31010 [article]

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Uncovering the statistical and spatial characteristics of fine toposcale DEM error / Juha Oksanen in International journal of geographical information science IJGIS, vol 20 n° 4 (april 2006)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 20 n° 4 (april 2006) . - pp 345 - 369 Titre : Uncovering the statistical and spatial characteristics of fine toposcale DEM error Type de document : Article/Communication Auteurs : Juha Oksanen, Auteur ; Tapani Sarjakoski, Auteur Année de publication : 2006 Article en page(s) : pp 345 - 369 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] contour [Termes IGN] données laser [Termes IGN] erreur aléatoire [Termes IGN] erreur systématique [Termes IGN] Finlande [Termes IGN] modèle d'erreur [Termes IGN] modèle numérique de surface [Termes IGN] propagation d'erreur Résumé : (Auteur) The aim of our study was to characterize statistical and spatial details of the errors in a fine toposcale DEM derived by contour data. The fine toposcale DEMs are typically represented in a 5-50 m grid and used in the application scale 1:10000-1:50000. The errors were determined by using high-quality reference data covering the entire study area from an airborne laser scanner. The work was motivated because of the essential role played by the correct characterization of DEM error in error-propagation studies. The results showed that the spatial autocorrelation of the fine toposcale DEM error was the result of a complex combination of random and systematic-like components, and its appropriate modelling by geostatistical methods is problematic because of the small extent of the areas in which the assumption of stationarity is valid. In addition, describing the shape of the DEM error distribution was impossible with a single parameter of dispersion. This was due to a large number of outliers, which suggests that more robust descriptors of the error should be used in addition to conventional error statistics. Numéro de notice : A2006-178 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/13658810500433891 En ligne : https://doi.org/10.1080/13658810500433891 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27905 [article]

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A prototype cross-border GML data service / L. Lehto (2004)  

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Simultaneous graphic generalization of vector data sets / Lars Harrie in Geoinformatica, vol 6 n° 3 (September - November 2002)  

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Interactive visualisation of geographical objects on the internet / J. Kahkonen in International journal of geographical information science IJGIS, vol 13 n° 4 (July 1999)  

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Experimental test on digital aerial triangulation / J. Jaakola (1996)

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Formalization of cartographic knowledge using an expert system shell / M. Laurema (1991)

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Automation in photogrammetric block adjustment systems / Tapani Sarjakoski (1988)

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