Brisc, Felicia, Hartmann, Jens and Moosdorf, Nils (2018) Web-Based Interactive Visualization Of A High Resolution Global Lithological Map. [Talk] In: EGU General Assembly. , April 2018, Wien .

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Abstract

The Lithological Map Viewer is a tool to study the distribution of mapped lithological units, and which allows tozoom into areas of interest. The underlying data is based on globally high resolution information, derived from theGlobal Lithological Map database GLiM v1.1. That database presents by now the most accurate globally availablepicture of the lithological characteristics of the Earth’s crust beneath the soil. Rock type information from morethan 90 regional maps and additional literature sources was translated into 16 lithological classes and numeroussubclasses. The map database has been used by various disciplines ranging from geochemistry over hydrology toecology.New techniques have been used to make this information available in an easy to use fashion for spatial, vi-sual analysis. Built upon the emerging graphics language WebGL, the Lithological Map Viewer has the advantageof being seamlessly integrated into standard Web browsers, eliminating the need to install additional pluginsbefore data viewing. Moreover, WebGL offers the possibility of graphics hardware accelerated data rendering.The high resolution of the global lithological map translates to a considerable amount of data: over 200 millionpoints were stored for our visualization in a point cloud format. In order to achieve the interactive rendering ofmillions of points in a web browser, a visualization strategy was adopted that decreases the rendered data volumewhile increasing rendering and data transfer speed at the same time. Thus, the data set was pre-partitioned spatiallywith the help of an out-of-core algorithm that stores various levels of detail of the original model in a hierarchicaloctree data structure. We combined this data structure with a view-dependent rendering technique based on theprinciple that the greater the distance from the viewing point, the fewer details will need to be displayed.Future directions: The Lithological Map Viewer can be extended to enable data visualization for otherEarth Science domains, such as oceanography, hydrology, meteorology or climate science.

Document Type: Conference or Workshop Item (Talk)
Research affiliation: Biogeochemistry and Geology > Submarine Groundwater Discharge
Affiliations > Not ZMT
Date Deposited: 01 Sep 2020 12:56
Last Modified: 01 Oct 2020 13:01
URI: http://cris.leibniz-zmt.de/id/eprint/4126

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