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WEB-SYSTEM

Virtual Morphometric Globes for the Earth, Mars, and the Moon

Abstract

We developed a web-system of virtual morphometric globes for the Earth, Mars and the Moon. As the initial data, we used a global digital elevation model (DEM) SRTM30_PLUS of the Earth, as well as DEMs of Mars and the Moon from the Mars Orbiter Laser Altimeter (MOLA) and the Lunar Orbiter Laser Altimeter (LOLA) gridded archives, correspondingly. For each celestial body, the system represents global models of 17 morphometric variables including: (a) elevation; (b) 12 local variables (horizontal curvature, vertical curvature, minimal curvature, maximal curvature, mean curvature, Gaussian curvature, difference curvature, vertical excess curvature, horizontal excess curvature, ring curvature, accumulation curvature, and unsphericity); (c) 2 nonlocal variables (catchment area and dispersive area); and (d) 2 combined variables (topographic index and stream power index). Global morphometric models were derived from DEMs with the resolution of 15 arc-minutes. The morphometric models were integrated into the web system developed as a distributed application consisting of a client front-end and a server back-end. The following main functions are implemented in the system: (1) selection of a celestial body; (2) selection of a morphometric variable; (3) two-dimensional visualization of a global morphometric model (a map); (4) 3D visualization of a global morphometric model on the sphere surface (a globe); (5) selection of a legend; (6) change of a globe scale; (7) globe rotation by an arbitrary angle. Free, real-time web access to the system is provided at: http://cartsrv.mexlab.ru/virtualglobe.

Authors: A.S. Garov (MExLab MIIGAiK), I.V. Florinsky (IMPB KIAM RAS),  I.P. Karachevtseva (MExLab MIIGAiK).

© MExLab MIIGAiK and IMPB KIAM RAS, 2017.

The system development was supported by RFBR grant 15-07-02484.