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  1. Timestamp as M-value on SpatiaLite + QGIS

    Feb. 24, 2019 | tags: GPS

    After spending weeks playing with my own 2-year GPS log, I wanted to colorize each track gradiently based on velocity.

    While it sounds straight-forward to use the "trackpoints" table in the same SpatiaLite database to achieve this, it turned out not so. Plotting millions of points is quite slow and …

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  2. GPX Editor Comparison for Manual Cleansing

    Feb. 10, 2019 | tags: GPS

    Summary

    GPS tracks have to be cleansed (removing outliers) before analysis, and cleansing requires some manual editing.

    For this manual editing, I searched around for a good tool. Many are available, but there's no definite winner. Here's the detailed comparison.

    Note that this comparison is only for manual cleansing of …

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