New answers tagged visualisation
In fact there are two different questions here: How should I represent this data, and how to do it technically. I'll focus only on the first here. What is the source of the standard deviation? If it is due to the laboratory procedure, ... I would not show it on a map. It makes sense to do it if it represents spatial variation, eg you took different samples ...
A quick Google search turned up: Spar Point Group has a nice writeup on several web-based point cloud viewers at http://www.sparpointgroup.com/blogPost.aspx?id=3879 This viewer is just too cool: http://lidarview.com/ PointCloud looks promising, and supposedly is free: http://pointcloud.io/
You could look at Cesium. A local city GIS office showed a demo of an LiDAR point cloud using Cesium at a recent conference. I don't recall if you could measure in it, but you could at least zoom, pan and rotate around.
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