A couple of weeks ago I wrote about building a point cloud visualisation tool in OCaml, and I've found a little time this week to crunch of that more, mostly by contributing to the various existing geospatial libraries that Patric Ferris has started pulling together under Geocaml. For example, by adding a simple bounds check to the rtree library there, I've managed to make my visualiser work out the spatial extent of the tiles being served to it, and so now it's no longer hard coded to a specific location in central Sweden, and I can for instance throw a bunch of data collected for one of David Coomes' projects of the Cairngorms up in Scotland: I threw in all 114GB of data from that project into my viewer and the server coped fine with 635 tiles. Which shouldn't be too much of a surprise, as the viewer is only ever fetching 25 tiles at once, and even for an optimised rtree index 635 tiles doesn't feel that much of a stretch, but it's an order of magnitude more data than I've pushed…
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