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Singla, Jai Gopal
- Virtual reality based novel use case in remote sensing and GIS
Abstract Views :194 |
PDF Views:80
Authors
Affiliations
1 Space Applications Centre, ISRO, Ahmedabad 380 015, India
1 Space Applications Centre, ISRO, Ahmedabad 380 015, India
Source
Current Science, Vol 121, No 7 (2021), Pagination: 958-961Abstract
Virtual reality (VR) is realistic, interactive and immersive 3D computer generated world that one can explore as if one is present in the scene. VR makes it possible to experience anything, anywhere and anytime. Head mount device (HMD) with headphones and hand controllers are used to provide fully immersive experience. There are three important I’s in VR; interactivity, immersion and imagination. Virtual reality is stepping in each and every domain like engineering, science, military, education, medical, tourism and entertainment. We have explored its potential for usage in remote sensing and Geographical Information System (GIS). Usually, GIS users analyse remote sensing data such as high resolution images, digital elevation models and vector data in commercial and open sources 2D GIS software(s). Available GIS software(s) allow users to interact with remote sensing data as a third person only. We have developed in-house virtual reality solution to generate a 3D terrain using high resolution imagery and elevation models over Earth. User can move around or teleport to different locations inside the 3D scene and interact with real time objects available in the sceneKeywords
Geographical Information System, head mount device, immersive nature, remote sensing, virtual realityFull Text
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- 3D building reconstruction and validation using high-resolution stereo data
Abstract Views :213 |
PDF Views:82
Authors
Affiliations
1 Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, IN
1 Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, IN
Source
Current Science, Vol 122, No 8 (2022), Pagination: 900-906Abstract
In recent times, due to advancement in satellite sensor technology and acquisition of very high resolution image data (0.3–1 m), high-resolution elevation models can be generated using satellite photogrammetry. High-resolution and precise digital elevation model (DEM) is an essential requirement for many applications like city modelling, terrain modelling, population estimation, resources estimation, visibility analysis, solar energy calculation, etc. Using high-resolution DEM and digital terrain model (DTM), heights of objects (buildings and trees) over the earth can be extracted for various applications. For visualization purpose, ortho image, building shapes with height information and important geographic information system information are used. This study mainly discusses the generation of high-resolution DEM from satellite stereo data, and processing of DEM and DTM. It also discusses extraction and validation of building heights using reference ground control points and visualization of highly accurate three-dimensional city model over the study area. This has been carried out using indigenous copyrighted software ‘Generation of virtual 3D city model’ of Space Applications Centre/Indian Space Research Organisation.Keywords
Building reconstruction, city modelling, satellite data, stereo processing.Full Text
References
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- 3D surface visualization of planetary data using Indian remote sensing datasets on a specialized multiprojector system
Abstract Views :162 |
PDF Views:86
Authors
Affiliations
1 Space Applications Centre, Indian Space Research Organization, Ahmedabad 380 015, India, IN
1 Space Applications Centre, Indian Space Research Organization, Ahmedabad 380 015, India, IN
Source
Current Science, Vol 123, No 10 (2022), Pagination: 1207-1215Abstract
This article describes the software (SW) implementation work to generate and visualize 3D surface models over the Earth, Moon and Mars using high-resolution satellite datasets from Indian remote sensing satellites over a specialized multiprojector system. Varied resolution datasets from Indian satellites like Cartosat series, ResourceSat, Mars Orbiter Mission and Chandrayaan-1, and digital elevation model (DEM) from CartoDEM were used for surface modelling and visualization. The generated high-resolution 3D surface model over the Earth is useful for strategy, urban planning, infrastructural planning, disaster management and educational purposes. It is also important to visualize the 3D surface of planets other than the Earth to visualize potential rover landing sites navigating to prominent features of the planet and validating future imaging sites. An indigenous SW package has been developed to model and visualize the 3D surface over multiprojector system, utilizing image processing techniques of data interpolation, image mosaicking, image registration, triangulation and texture mapping. Geographical information system layers representing places, roads and waterways have been integrated and overlaid on the terrain models for information.Keywords
Multiprojector system, planetary data, satel-lite datasets, three-dimensional surface.Full Text
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