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6 User Feedback In addition to the performance and scalability testing, we asked for feedback from domain experts using the tested tools on a daily basis. o to validate 24 J. Ježek et al. Fig. 4 Rendering times for GPU-based visualization the usability of the interactive heat map using the GPU-based visualization. We received this comment: “An interactive heat map enables a user to browse large dataset and might reveal hidden patterns. Such insights serve a valuable input to better formulate precise traffic engineering statistical analysis and safety management.

Int Arch Photogramm Remote Sens Spat Inf Sci 40(3):601–605 von Schwerin J, Richards-Rissetto H, Remondino F, Spera MG, Auer M, Billen N, Loos L, Stelson L, Reindel M (2016) Airborne LiDAR acquisition, post-processing and accuracy-checking for a 3D WebGIS of Copan, Honduras. J Archaeol Sci Rep 5:85–104 Vretanos PA (ed) (2005) OpenGIS web feature service (WFS) implementation specification ver. 1 Design and Evaluation of WebGL-Based Heat Map Visualization for Big Point Data Jan Ježek, Karel Jedlička, Tomáš Mildorf, Jáchym Kellar and Daniel Beran Abstract Depicting a large number of points on a map may lead to overplotting and to a visual clutter.

3 General algorithms for a quadtree subdivision and b random tree sampling Open Source First Person View 3D Point Cloud Visualizer … 33 Fig. 4 The point cloud visualization zones based on the number of random-sampled files loaded. In a the camera is located at the left-most node, and the number of files loaded depends on other nodes’ distance to the camera. 3 Visualization Strategies In order to be able to load more points, a point cloud visualization strategy has to be implemented. Loading all points at the same time would not be effective, even by using VRAM.

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