GeoVisuals: a visual analytics approach to leverage the potential of spatial videos and associated geonarratives

ABSTRACT

Videos embedded with spatial coordinates, especially when combined with additional expert insights, offer the potential to acquire fine-scale multi-time period contextualized data for a variety of different environments. However, while these geospatial multimedia (GSMM) data include abundant spatiotemporal, semantic and visual information, the means to fully leverage their potential using a suite of visual and interactive analysis techniques and tools has thus far been lacking. In this paper, we address this gap by first identifying the types of tasks required of GSMM data, and then presenting a solution platform. This GeoVisuals system utilizes a visual analysis approach built on semantic data points that can be integrated spatially, which in turn enables management in a unified database with combined spatio-temporal and text querying. A set of visualization functions are integrated in two investigation modes: geo-video analysis and geo-location analysis.     

Application of Remote Sensing in Studying Holocene Sediments and Tectonic Episodes at Kelshi,Ratnagiri District,Maharashtra, India

Kelshi is a coastal village, located on the southern bank of the Bharja river in Dapoli taluka of Ratnagiri district. All along the coast occurs a habitation site which is overlaid by a sand deposit having a thickness of +20 m. The archaeological artifacts collected around the site are found to be significant in understanding the antiquity of the site. It also substantiates that, human occupation survived here for seven centuries. Remote sensing data interpretation carried out has revealed the existence of three lineaments in this area. In the field, the lineaments have been confirmed as faulted surfaces and the magnitude of the movements along are measurable. A geophysical survey was conducted by using ABEM WADI equipment for confirmation of outcome of the aerial-photo interpretation. It confirms that the area had undergone three tectonic activities after 1524 A.D. The inferences based on the investigations convinced us to study the historical seismicity of this region. A comprehensive and exhaustive investigation in such areas is necessary to know the evolution of the west coast of India and the tectonic activity during the late Holocene.     

Giant phenocryst basalts in the deccan trap

This paper gives an account of some unusual porphyritic basalts containing very large phenocrysts of plagioclase, averaging from 3 cm to 5 cm in length, and at places as large as 10 to 12 cm in length. These flows have been noticed at more than 20 localities, spread all over Western Maharashtra, occurring between levels of 100 feet below sea level (seen in a drill-core) and an elevation of more than 4000 feet above sea level. They appear to have a considerable lateral extent, some of them having been observed to extend for more than ten miles. In vertical extent, the flows were found to vary from 40 to 150 feet. The giant phenocrysts commonly show cross-twinning. In some flows due to repeated cross-twinning they give star shaped appearance. At places they also occur in clusters. In portions of some flows the tablets seem to have settled at the bottom and are seen in horizontal positions. In hydrothermally altered portions of some flows the phenocrysts are altered and in some patches seem to have been completely destroyed. As a rule, the plagioclase weathers more quickly than the ground mass producing a very characteristic pitted appearance. Some flows seem to have contained large crystals of olivine which have been altered to iddingsite. Highly vesicular and amygdaloidal giant phenocrvst basalts are also met with.