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Wireframing for interactive & web-based geographic visualization: designing the NOAA Lake Level Viewer / Robert Emmett Roth in Cartography and Geographic Information Science, Vol 44 n° 4 (July 2017)
Titre : Wireframing for interactive & web-based geographic visualization: designing the NOAA Lake Level Viewer Type de document : Article/Communication Auteurs : Robert Emmett Roth, Auteur ; David Hart, Auteur ; Rashauna Mead, Auteur ; Chloë Quinn, Auteur Année de publication : 2017 Article en page(s) : pp 338 - 357 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] Amérique du nord
[Termes IGN] géomatique web
[Termes IGN] géovisualisation
[Termes IGN] Grands Lacs
[Termes IGN] image NOAA
[Termes IGN] interface web
[Termes IGN] maquette fonctionnelle
[Termes IGN] niveau hydrostatique
[Vedettes matières IGN] GéovisualisationRésumé : (auteur) In this article, we explore the potential of wireframe design and evaluation for interactive and web-based mapping through a case study on water level visualization. Specifically, our research informed design and development of the National Oceanic & Atmospheric Administration’s (NOAA) Lake Level Viewer (http://coast.noaa.gov/llv/), an interactive and web-based geovisualization application for the Great Lakes region of North America. As part of our overall user-centered design process, we created two sets of wireframes to evaluate two aspects of the user experience: high-fidelity wireframes to illustrate the proposed representation solution using real data and low-fidelity wireframes to provide a rough sketch of the proposed interaction solution. Eighteen target users completed cognitive walkthroughs of the wireframes, with the sessions audio-recorded for subsequent transcription and qualitative data analysis. The wireframe evaluations led to a series of revisions to the functional scope and visual design of the Lake Level Viewer. The process also generated recommendations for designing water level visualizations supporting adaptive management in response to climate change as well as for leveraging wireframes in support of large-scale mapping and GIS projects. Numéro de notice : A2017-225 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/15230406.2016.1171166 En ligne : http://dx.doi.org/10.1080/15230406.2016.1171166 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85106
in Cartography and Geographic Information Science > Vol 44 n° 4 (July 2017) . - pp 338 - 357[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 032-2017041 RAB Revue Centre de documentation En réserve L003 Disponible
Titre : Improving the assessment of ICESat water altimetry accuracy accounting for autocorrelation Type de document : Article/Communication Auteurs : Hani Abdallah, Auteur ; Jean-Stéphane Bailly, Auteur ; Nicolas Baghdadi, Auteur ; Nicolas Lemarquand, Auteur Année de publication : 2011 Article en page(s) : pp 833 - 844 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] altimétrie satellitaire par laser
[Termes IGN] autocorrélation spatiale
[Termes IGN] données altimétriques
[Termes IGN] données ICEsat
[Termes IGN] Etats-Unis
[Termes IGN] filtrage du rayonnement
[Termes IGN] forme d'onde
[Termes IGN] géostatistique
[Termes IGN] Grands Lacs
[Termes IGN] incertitude géométrique
[Termes IGN] précision altimétrique
[Termes IGN] ressources en eauRésumé : (Auteur) Given that water resources are scarce and are strained by competing demands, it has become crucial to develop and improve techniques to observe the temporal and spatial variations in the inland water volume. Due to the lack of data and the heterogeneity of water level stations, remote sensing, and especially altimetry from space, appear as complementary techniques for water level monitoring. In addition to spatial resolution and sampling rates in space or time, one of the most relevant criteria for satellite altimetry on inland water is the accuracy of the elevation data. Here, the accuracy of ICESat LIDAR altimetry product is assessed over the Great Lakes in North America. The accuracy assessment method used in this paper emphasizes on autocorrelation in high temporal frequency ICESat measurements. It also considers uncertainties resulting from both in situ lake level reference data. A probabilistic upscaling process was developed. This process is based on several successive ICESat shots averaged in a spatial transect accounting for autocorrelation between successive shots. The method also applies pre-processing of the ICESat data with saturation correction of ICESat waveforms, spatial filtering to avoid measurement disturbance from the land–water transition effects on waveform saturation and data selection to avoid trends in water elevations across space. Initially this paper analyzes 237 collected ICESat transects, consistent with the available hydrometric ground stations for four of the Great Lakes. By adapting a geostatistical framework, a high frequency autocorrelation between successive shot elevation values was observed and then modeled for 45% of the 237 transects. The modeled autocorrelation was therefore used to estimate water elevations at the transect scale and the resulting uncertainty for the 117 transects without trend. This uncertainty was 8 times greater than the usual computed uncertainty, when no temporal correlation is taken into account. This temporal correlation, corresponding to approximately 11 consecutive ICESat shots, could be linked to low transmitted ICESat GLAS energy and to poor weather conditions. Assuming Gaussian uncertainties for both reference data and ICESat data upscaled at the transect scale, we derived GLAS deviations statistics by averaging the results at station and lake scales. An overall bias of -4.6 cm (underestimation) and an overall standard deviation of 11.6 cm were computed for all lakes. Results demonstrated the relevance of taking autocorrelation into account in satellite data uncertainty assessment. Numéro de notice : A2011-471 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2011.09.002 En ligne : https://doi.org/10.1016/j.isprsjprs.2011.09.002 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31365
in ISPRS Journal of photogrammetry and remote sensing > vol 66 n° 6 (November 2011) . - pp 833 - 844[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 081-2011061 SL Revue Centre de documentation Revues en salle Disponible
Titre : A ''living'' atlas for geospatial storytelling: the cybercartographic atlas of indigenous perspectives ... Atlas of indigenous perspectives and knowledge of the Great Lakes Region in Ontario Type de document : Article/Communication Auteurs : Sébastien Caquard, Auteur ; H. Igloriorte, Auteur ; A. Hayes, Auteur ; et al., Auteur Année de publication : 2009 Article en page(s) : pp 83 - 100 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie thématique
[Termes IGN] approche participative
[Termes IGN] atlas numérique
[Termes IGN] cartographie par internet
[Termes IGN] géographie humaine
[Termes IGN] Grands Lacs
[Termes IGN] histoire
[Termes IGN] internet interactif
[Termes IGN] Ontario (Canada)
[Termes IGN] participation du publicRésumé : (Auteur) Dans l'article, on parle du contexte culturel et technologique dans lequel a été préparé le Cybercartographic atlas of indigenous Perspective and knowledge of the Great Lakes Region in Ontario. Cet atlas permet de mieux récupérer la nature générale des connaissances autochtones traditionnelles en reliant électroniquement différentes formes de la culture expressive (langage, traditions orales, éléments de culture matériels ou visuels, documents historiques). Pour atteindre cet objectif, l'atlas contient une base de données géospatiale "vivante". Servant de réserve pour les artéfacts, elle offre aux collectivités d'ajouter des connaissances géographiques pertinentes et de créer en ligne leur propres histoires géospatiales, interactives et multimédiatiques, par modules ou sections. On décrit deux de ces modules sur les traités, qui porte sur l'étape du levé pour le traité du lac Huron, et un module culturel visant à inciter les artistes autochtones, les membres de la collectivité et les étudiants du secondaire à contribuer au développement de cet atlas axé sur la communauté. La discussion se termine par un regard critique sur le potentiel de la cybercartographie et les défis à relever dans ce domaine, particulièrement quand au développement de l'aspect "vivant" et du caractère collaboratif des atlas cybercartographiques. Copyright University of Toronto Press Numéro de notice : A2009-200 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.3138/carto.44.2.83 Date de publication en ligne : 26/06/2009 En ligne : https://doi.org/10.3138/carto.44.2.83 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29830
in Cartographica > vol 44 n° 2 (June 2009) . - pp 83 - 100[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 031-09021 RAB Revue Centre de documentation En réserve L003 Disponible
Titre : Mapping an invasive plant, Phragmites australis [roseau], in coastal wetlands using the EO-1 Hyperion hyperspectral sensor Type de document : Article/Communication Auteurs : B.W. Pengra, Auteur ; C.A. Johnston, Auteur ; T.R. Loveland, Auteur Année de publication : 2007 Article en page(s) : pp 74 - 81 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] carte thématique
[Termes IGN] espèce exotique envahissante
[Termes IGN] Grands Lacs
[Termes IGN] image EO1-Hyperion
[Termes IGN] image hyperspectrale
[Termes IGN] marais
[Termes IGN] phytogéographie
[Termes IGN] plante aquatique d'eau salée
[Termes IGN] répartition géographique
[Termes IGN] Wisconsin (Etats-Unis)Résumé : (Auteur) Mapping tools are needed to document the location and extent of Phragmites australis, a tall grass that invades coastal marshes throughout North America, displacing native plant species and degrading wetland habitat. Mapping Phragmites is particularly challenging in the freshwater Great Lakes coastal wetlands due to dynamic lake levels and vegetation diversity. We tested the applicability of Hyperion hyperspectral satellite imagery for mapping Phragmites in wetlands of the west coast of Green Bay in Wisconsin, U.S.A. A reference spectrum created using Hyperion data from several pure Phragmites stands within the image was used with a Spectral Correlation Mapper (SCM) algorithm to create a raster map with values ranging from 0 to 1, where 0 represented the greatest similarity between the reference spectrum and the image spectrum and 1 the least similarity. The final two-class thematic classification predicted monodominant Phragmites covering 3.4% of the study area. Most of this was concentrated in long linear features parallel to the Green Bay shoreline, particularly in areas that had been under water only six years earlier when lake levels were 66 cm higher. An error matrix using spring 2005 field validation points (n = 129) showed good overall accuracy—81.4%. The small size and linear arrangement of Phragmites stands was less than optimal relative to the sensor resolution, and Hyperion's 30 m resolution captured few if any pure pixels. Contemporary Phragmites maps prepared with Hyperion imagery would provide wetland managers with a tool that they currently lack, which could aid attempts to stem the spread of this invasive species. Copyright Elsevier Numéro de notice : A2007-217 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2006.11.002 En ligne : https://doi.org/10.1016/j.rse.2006.11.002 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28580
in Remote sensing of environment > vol 108 n° 1 (15/05/2007) . - pp 74 - 81[article]
Titre : Mapping submergent aquatic vegetation in the US Great Lakes using Quickbird satellite data Type de document : Article/Communication Auteurs : P.T. Wolter, Auteur ; C.A. Johnston, Auteur ; G.J. Niemi, Auteur Année de publication : 2005 Article en page(s) : pp 5255 - 5274 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] carte de la végétation
[Termes IGN] données bathymétriques
[Termes IGN] écosystème
[Termes IGN] Etats-Unis
[Termes IGN] Grands Lacs
[Termes IGN] image multitemporelle
[Termes IGN] image Quickbird
[Termes IGN] macrophyte
[Termes IGN] photo-interprétationRésumé : (Auteur) Submergent aquatic vegetation (SAV) is a powerful indicator of environmental conditions in both marine and fresh water ecosystems. Quickbird imagery was used to map SAV at three sites across the Great Lakes. Unsupervised classifications were performed at each site using summer Quickbird sensor data. At one site, a multi-temporal classification approach was added, combining visible red difference (May August) with August red and green visible band data. Multi-temporal SAV classification was superior to single-date results at this site. Muck bottom was not seriously confused with SAV, which was unexpected. Multi-temporal classification results showed less confusion between deep water and SAV, although spectral variability due to sub-surface sandbar structure was a source of error in both single-and multi-date classifications. Nevertheless, some of the confounding effects of water column on SAV classification appear to have been mitigated using this multi-temporal approach. Future efforts would be well served by incorporating detailed, continuous, bathymetry data in the classification process. Quickbird sensor data are very useful for classifying SAV under US Great Lakes conditions. However, regional classification efforts using these data may be impractical at this time, as high cost, rigid tasking parameters and impredictable water conditions limit availability of suitable imagery. Numéro de notice : A2005-516 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160500219208 En ligne : https://doi.org/10.1080/01431160500219208 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27652
in International Journal of Remote Sensing IJRS > vol 26 n° 23 (December 2005) . - pp 5255 - 5274[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 080-05231 RAB Revue Centre de documentation En réserve L003 Exclu du prêt PermalinkPermalinkPermalinkGéographie universelle, 2. Tome 13 Amérique septentrionale, deuxième partie États-Unis / Paul Vidal De La Blache (1936)
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