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Point-of-interest detection from Weibo data for map updating / Xue Yang in Transactions in GIS, vol 26 n° 6 (September 2022)  

Public [article]  inTransactions in GIS > vol 26 n° 6 (September 2022) . - pp 2716 - 2738 Titre : Point-of-interest detection from Weibo data for map updating Type de document : Article/Communication Auteurs : Xue Yang, Auteur ; Jie Gao, Auteur ; Xiaoyun Zheng, Auteur ; et al., Auteur Année de publication : 2022 Article en page(s) : pp 2716 - 2738 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web [Termes IGN] classification par forêts d'arbres décisionnels [Termes IGN] commerce de détail [Termes IGN] détection automatique [Termes IGN] détection de changement [Termes IGN] données issues des réseaux sociaux [Termes IGN] géocodage [Termes IGN] inférence [Termes IGN] information sémantique [Termes IGN] mise à jour cartographique [Termes IGN] point d'intérêt [Termes IGN] Wuhan (Chine) Résumé : (auteur) Points-of-interest (POIs) geographic information system data are increasingly important for supporting map generation and navigation services, although updating their semantic and location information still largely depends on manual labor. In this study, we propose a novel method to automatically detect the changes in POIs from Chinese text and check-in position data provided by the Chinese social media platform, Weibo. The proposed method includes three steps: (1) POI name recognition; (2) location confirmation; (3) and change detection. First, we propose recognizing a POI's name from Weibo text using the improved conditional random field algorithm. Then, we detect the location of each named POI by integrating the text address with the check-in position. The changes in the detected POIs are recognized by extracting the status words from Weibo text and a three-level status word database. To verify the effectiveness of the proposed method, we examine Wuhan as a case and detect the changes in the commercial POI using real-world Weibo data collected from January to September 2020. Based on the validation of three common map platforms, the data provided and the manual field investigation of 55 random samples, the identification accuracies for newly added POIs, the unchanged POIs, and expired POIs are approximately 100, 95.8, and 91.7%, respectively. Numéro de notice : A2022-734 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1111/tgis.12982 Date de publication en ligne : 04/09/2022 En ligne : https://doi.org/10.1111/tgis.12982 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=101701 [article]

The willingness of volonteers to report changes on topographic maps / Mihaela Triglav Cekada in Geodetski vestnik, vol 65 n° 3 (September - November 2021)  

Public [article]  inGeodetski vestnik > vol 65 n° 3 (September - November 2021) Titre : The willingness of volonteers to report changes on topographic maps Type de document : Article/Communication Auteurs : Mihaela Triglav Cekada, Auteur ; Dalibor Radovan, Auteur Année de publication : 2021 Langues : Anglais (eng) Slovène (slv) Descripteur : [Vedettes matières IGN] Géomatique web [Termes IGN] approche participative [Termes IGN] carte topographique [Termes IGN] collecte de données [Termes IGN] données localisées des bénévoles [Termes IGN] enquête [Termes IGN] fiabilité des données [Termes IGN] mise à jour cartographique [Termes IGN] questionnaire [Termes IGN] réseau social [Termes IGN] Slovénie Résumé : (auteur) Various possibilities for collecting volunteer-provided geographical information in geodesy make it possible to engage volunteers for different purposes. In this paper, a study of the willingness of volunteers to report changes on topographic maps based on an online survey is presented. The survey was answered by 653 Slovenian respondents who use various online or classic topographic maps in their free time or at work and are willing to report their knowledge of changes in space or errors in maps to the map-updating institution. The survey's main finding is that 56% of respondents would use any online application to report changes on maps, 38% of respondents would prefer to report changes via email, and only 4% of respondents would prefer to report changes by phone. We also analysed the potential use of different functionalities of a web application for collecting changes and found that the most important functionalities for volunteers are those that give the most in-depth feedback (i.e., that a contribution has been submitted, that it is being verified, that it has been considered, that it has been deleted). The willingness of potential volunteers to use the various proposed functionalities also frequently depends on their current involvement with social networking sites or in volunteer associations and on their age group. Numéro de notice : A2021-771 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.15292/geodetski-vestnik.2021.03.400-439 Date de publication en ligne : 18/07/2021 En ligne : https://doi.org/10.15292/geodetski-vestnik.2021.03.400-439 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=98825 [article]

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Application of terrestrial laser scanning to the development and updating of the base map / Przemysław Klapa in Geodesy and cartography, vol 66 n° 1 (June 2017)  

Public [article]  inGeodesy and cartography > vol 66 n° 1 (June 2017) . - pp 59 - 72 Titre : Application of terrestrial laser scanning to the development and updating of the base map Type de document : Article/Communication Auteurs : Przemysław Klapa, Auteur ; Bartosz Mitka, Auteur Année de publication : 2017 Article en page(s) : pp 59 - 72 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie [Termes IGN] carte de base [Termes IGN] lasergrammétrie [Termes IGN] mise à jour cartographique [Termes IGN] Pologne Résumé : (auteur) The base map provides basic information about land to individuals, companies, developers, design engineers, organizations, and government agencies. Its contents include spatial location data for control network points, buildings, land lots, infrastructure facilities, and topographic features. As the primary map of the country, it must be developed in accordance with specific laws and regulations and be continuously updated. The base map is a data source used for the development and updating of derivative maps and other large scale cartographic materials such as thematic or topographic maps. Thanks to the advancement of science and technology, the quality of land surveys carried out by means of terrestrial laser scanning (TLS) matches that of traditional surveying methods in many respects. This paper discusses the potential application of output data from laser scanners (point clouds) to the development and updating of cartographic materials, taking Poland’s base map as an example. A few research sites were chosen to present the method and the process of conducting a TLS land survey: a fragment of a residential area, a street, the surroundings of buildings, and an undeveloped area. The entire map that was drawn as a result of the survey was checked by comparing it to a map obtained from PODGiK (pol. Powiatowy Ośrodek Dokumentacji Geodezyjnej i Kartograficznej – Regional Centre for Geodetic and Cartographic Records) and by conducting a field inspection. An accuracy and quality analysis of the conducted fieldwork and deskwork yielded very good results, which provide solid grounds for predicating that cartographic materials based on a TLS point cloud are a reliable source of information about land. The contents of the map that had been created with the use of the obtained point cloud were very accurately located in space (x, y, z). The conducted accuracy analysis and the inspection of the performed works showed that high quality is characteristic of TLS surveys. The accuracy of determining the location of the various map contents has been estimated at 0.02-0.03 m. The map was developed in conformity with the applicable laws and regulations as well as with best practice requirements. Numéro de notice : A2017-785 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1515/geocart-2017-0002 En ligne : https://doi.org/10.1515/geocart-2017-0002 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89097 [article]

Object-based analysis of multispectral airborne laser scanner data for land cover classification and map updating / Leena Matikainen in ISPRS Journal of photogrammetry and remote sensing, vol 128 (June 2017)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 128 (June 2017) . - pp 298 - 313 Titre : Object-based analysis of multispectral airborne laser scanner data for land cover classification and map updating Type de document : Article/Communication Auteurs : Leena Matikainen, Auteur ; Kirsi Karila, Auteur ; Juha Hyyppä, Auteur ; et al., Auteur Année de publication : 2017 Article en page(s) : pp 298 - 313 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] analyse d'image orientée objet [Termes IGN] classification dirigée [Termes IGN] image 3D [Termes IGN] image multibande [Termes IGN] instrumentation Optech [Termes IGN] mise à jour cartographique [Termes IGN] occupation du sol [Termes IGN] semis de points [Termes IGN] télémétrie laser aéroporté Résumé : (Auteur) During the last 20 years, airborne laser scanning (ALS), often combined with passive multispectral information from aerial images, has shown its high feasibility for automated mapping processes. The main benefits have been achieved in the mapping of elevated objects such as buildings and trees. Recently, the first multispectral airborne laser scanners have been launched, and active multispectral information is for the first time available for 3D ALS point clouds from a single sensor. This article discusses the potential of this new technology in map updating, especially in automated object-based land cover classification and change detection in a suburban area. For our study, Optech Titan multispectral ALS data over a suburban area in Finland were acquired. Results from an object-based random forests analysis suggest that the multispectral ALS data are very useful for land cover classification, considering both elevated classes and ground-level classes. The overall accuracy of the land cover classification results with six classes was 96% compared with validation points. The classes under study included building, tree, asphalt, gravel, rocky area and low vegetation. Compared to classification of single-channel data, the main improvements were achieved for ground-level classes. According to feature importance analyses, multispectral intensity features based on several channels were more useful than those based on one channel. Automatic change detection for buildings and roads was also demonstrated by utilising the new multispectral ALS data in combination with old map vectors. In change detection of buildings, an old digital surface model (DSM) based on single-channel ALS data was also used. Overall, our analyses suggest that the new data have high potential for further increasing the automation level in mapping. Unlike passive aerial imaging commonly used in mapping, the multispectral ALS technology is independent of external illumination conditions, and there are no shadows on intensity images produced from the data. These are significant advantages in developing automated classification and change detection procedures. Numéro de notice : A2017-336 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2017.04.005 En ligne : https://doi.org/10.1016/j.isprsjprs.2017.04.005 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85499 [article]

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New maps for a new millennium / Aude Areste Lamendour in GEO: Geoconnexion international, vol 14 n° 9 (October 2015)

Public [article]  inGEO: Geoconnexion international > vol 14 n° 9 (October 2015) . - pp 32 - 35 Titre : New maps for a new millennium Type de document : Article/Communication Auteurs : Aude Areste Lamendour, Auteur ; Aurélie Milledrogues, Auteur Année de publication : 2015 Article en page(s) : pp 32 - 35 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie étrangère [Termes IGN] base de données cartographiques [Termes IGN] Burkina Faso [Termes IGN] mise à jour cartographique [Termes IGN] orthoimage [Termes IGN] rédaction cartographique Résumé : (éditeur) A four-year project to update Burkina Faso’s national mapping for the first time in 50 years has just concluded. Aude Areste Lamendour and Aurélie Milledrogues report. Numéro de notice : A2015-654 Affiliation des auteurs : IGN+Ext (2012-2019) Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtSansCL DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=78258 [article]

Géoportail / Paul Courbon in XYZ, n° 143 (juin - août 2015) 

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Partir en guerre avec les cartes du Service géographique de l'armée : le rapport Gervais / Guillaume Le Bailly in Cartes & Géomatique, n° 223 (mars 2015) 

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Une approche basée objet combinée avec les classifieurs avancés (SVM, RF, Extra Trees) pour la détection des changements du bâti / Loubna Elmansouri in Revue internationale de géomatique, vol 24 n° 2 (juin - août 2014)  

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Use of artificial neural networks for selective omission in updating road networks / Qi Zhou in Cartographic journal (the), vol 51 n° 1 (February 2014)  

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A new method for automatic large scale map updating using mobile mapping imagery / Jianliang Ou in Photogrammetric record, vol 28 n° 143 (September - November 2013)  

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Automatic production and updating of topographic maps / M. Von Wyl in GEO: Geoconnexion international, vol 12 n° 1 (januery 2013)

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St-Charles Parish and GNSS signal shadow issues: Satellite shadow reduction technology / K. Corbley in Geoinformatics, vol 15 n° 4 (01/06/2012)

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Michelin, cent ans de cartographie / Philippe Sablayrolles in Le monde des cartes, n° 208 (juin 2011)

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Géomarketing et analyse spatiale appliqués aux problématiques média de nos clients / Ann-Constance Rammant (2011)

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Suivi actualisé d'indicateurs agricoles parcellaires sur des zones de protection de captages d'eau potable / V. Dardare in Géomatique expert, n° 76 (01/09/2010)

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