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Geovisualization with immersive virtual environments in theory and practice

International Journal of Digital Earth 2019年第2期12卷 123-136页

作者： Florian Hruby rainer ressl and Genghis de la Borbolla del Valle Department of Geomatics National Commission for the Knowledge and Use of Biodiversity(CONABIO)Mexico CityMexico

Virtual reality(VR)is a frequently emphasized issue on the Digital Earth(DE)*** current DE research is more engaged in the technical aspects of VR applications,this paper focuses on what is possible with immersive virtual environments(IVE)from the user’s *** a brief discussion of spatial presence and embodiment in the context of IVE,both concepts will be merged into a geovisualization immersion pipeline(GIP)as a framework with which to systematically link technical and cognitive aspects of *** will then analyze the general criteria that must be met by IVE in order to facilitate the experience of spatial *** these criteria to the special requirements of geospatial data,a definition of geovisualization immersive virtual environments(GeoIVE)is ***,the theoretical considerations of this paper are set into practice,using a GeoIVE of a coral reef ecosystem as an *** we shall see,while GIS do not provide data models or data compatibility for direct visualization of GeoIVE on VR output devices,game engines can serve as middleware to fill this gap.

关键词： Digital Earth geovisualization virtual reality immersive virtual environments spatial presence

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Dynamics of coastline changes in Mexico

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Journal of Geographical Sciences 2019年第10期29卷 1637-1654页

作者： VALDERRAMA-LANDEROS Luis H. MARTELL-DUBOIS Raúl ressl rainer SILVA-CASARíN Rodolfo CRUZ-RAMíREZ Cesia J. MUNOZ-PEREZ Juan J. National Commission for the Knowledge and Use of Biodiversity Liga Periferico-Insurgentes Sur 4903 Col. Parques del Pedregal Del. Tlalpan Ciudad de Mexico. C.P. 14010 Mexico Instituto de Ingeniería UNAM Circuito Escolar s/n Ciudad UniversitariaDelegacion Coyoacan Ciudad de Mexico C.P. 04510 Mexico Physical Oceanography Cadiz University Dpto.de Física Aplicada CASEM11150 Puerto Real (Cadiz) Spain

The goal of our work was to locate and quantify changes that occurred in 66% of the Mexican coastline, based on four land cover maps generated by the Mexican Mangrove Monitoring System(SMMM) of the National Commission for the Knowledge and Use of Biodiversity(CONABIO) for the years 1970/81, 2005, 2010, and 2015. Our results showed overall dominance of erosion over accretion processes, beaches being the most affected coastal land cover. Emphasis was placed on identification and description of coastline sites in which land was either continuously lost(erosion) or gained(accretion) during the studied time periods. These sites were defined as continuous unidirectional dynamic sites and were compared with previous knowledge about the geodynamics of Mexican coasts. Continuous unidirectional dynamic sites were distributed throughout the study area and within all land cover types, but predominantly corresponded to areas covered by mangroves in the states of Campeche and Nayarit. Finally, we found an intensification of coastal erosion-accretion processes over time;coastline change rates having duplicated between the earliest(1970/81–2005) and the two more recent(2005–2010, and 2010–2015) analysed time periods, with erosion rates for each corresponding period of –3 m/yr,–7.5 m/yr, and –7.3 m/yr,and accretion rates of 2.8 m/yr, 7.3 m/yr, and 6.9 m/yr, respectively.

关键词： changes in Mexican coastline Mexico coast erosion coast accretion

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